.github/workflows/pr.yml

@@ -1,27 +0,0 @@
-name: Java Gradle Build
-
-on:
-  pull_request
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - name: Set up JDK 8
-        uses: actions/setup-java@v2
-        with:
-          java-version: '8'
-          distribution: 'temurin'
-          cache: gradle
-      - name: Build with Gradle
-        run: ./gradlew build
-      - name: Cleanup Gradle Cache
-        # Remove some files from the Gradle cache, so they aren't cached by GitHub Actions.
-        # Restoring these files from a GitHub Actions cache might cause problems for future builds.
-        run: |
-          rm -f ~/.gradle/caches/modules-2/modules-2.lock
-          rm -f ~/.gradle/caches/modules-2/gc.properties

.github/workflows/release.yml

@@ -1,29 +0,0 @@
-name: Java Gradle Release
-
-on:
-  push:
-    tags:
-      - 'v\d+.\d+.\d+'
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - name: Set up JDK 8
-        uses: actions/setup-java@v2
-        with:
-          java-version: '8'
-          distribution: 'temurin'
-          cache: gradle
-      - name: Publish with Gradle
-        run: ./gradlew publish -Pgithub.token="${{ secrets.GITHUB_TOKEN }}" -Pbunnycdn.token="${{ secrets.BUNNYCDN_TOKEN }}" -Prelease=true
-      - name: Cleanup Gradle Cache
-        # Remove some files from the Gradle cache, so they aren't cached by GitHub Actions.
-        # Restoring these files from a GitHub Actions cache might cause problems for future builds.
-        run: |
-          rm -f ~/.gradle/caches/modules-2/modules-2.lock
-          rm -f ~/.gradle/caches/modules-2/gc.properties

.github/workflows/snapshot.yml

@@ -1,29 +0,0 @@
-name: Java Gradle Snapshot
-
-on:
-  push:
-    branches:
-      - 'main'
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - name: Set up JDK 8
-        uses: actions/setup-java@v2
-        with:
-          java-version: '8'
-          distribution: 'temurin'
-          cache: gradle
-      - name: Publish with Gradle
-        run: ./gradlew publish -Pgithub.token="${{ secrets.GITHUB_TOKEN }}" -Pbunnycdn.token="${{ secrets.BUNNYCDN_TOKEN }}"
-      - name: Cleanup Gradle Cache
-        # Remove some files from the Gradle cache, so they aren't cached by GitHub Actions.
-        # Restoring these files from a GitHub Actions cache might cause problems for future builds.
-        run: |
-          rm -f ~/.gradle/caches/modules-2/modules-2.lock
-          rm -f ~/.gradle/caches/modules-2/gc.properties

build.gradle.kts

@@ -1,50 +1,45 @@
+buildscript {
+	repositories {
+		jcenter()
+	}
+	dependencies {
+		classpath("com.guardsquare:proguard-gradle:7.0.0") {
+			exclude("com.android.tools.build")
+		}
+	}
+}
+
 plugins {
 	java
 	application
-	id("com.github.johnrengelman.shadow") version "7.1.2"
-	id("com.palantir.git-version") version "0.13.0"
-	id("com.github.breadmoirai.github-release") version "2.4.1"
-	kotlin("jvm") version "1.7.10"
-	id("com.github.jk1.dependency-license-report") version "2.0"
-	`maven-publish`
+	id("com.github.johnrengelman.shadow") version "6.1.0"
+	id("com.palantir.git-version") version "0.12.3"
+	id("com.github.breadmoirai.github-release") version "2.2.12"
+	kotlin("jvm") version "1.4.21"
+	id("com.github.jk1.dependency-license-report") version "1.16"
 }
 
 java {
 	sourceCompatibility = JavaVersion.VERSION_1_8
 }
 
-repositories {
-	mavenCentral()
-	google()
-	maven {
-		url = uri("https://jitpack.io")
-	}
-}
-
-val r8 by configurations.creating
-val distJarOutput by configurations.creating {
-	isCanBeResolved = false
-	isCanBeConsumed = true
-
-	attributes {
-		attribute(Usage.USAGE_ATTRIBUTE, project.objects.named(Usage::class.java, Usage.JAVA_RUNTIME))
-		attribute(Bundling.BUNDLING_ATTRIBUTE, project.objects.named(Bundling::class.java, Bundling.EMBEDDED))
-	}
-}
+val shrinkClasspath: Configuration by configurations.creating
 
 dependencies {
-	implementation("commons-cli:commons-cli:1.5.0")
-	implementation("com.google.code.gson:gson:2.9.0")
-	implementation("com.squareup.okio:okio:3.1.0")
+	implementation("commons-cli:commons-cli:1.4")
+	shrinkClasspath("commons-cli:commons-cli:1.4")
+	implementation("com.moandjiezana.toml:toml4j:0.7.2")
+	implementation("com.google.code.gson:gson:2.8.1")
+	implementation("com.squareup.okio:okio:2.9.0")
 	implementation(kotlin("stdlib-jdk8"))
-	implementation("com.squareup.okhttp3:okhttp:4.10.0")
-	implementation("cc.ekblad:4koma:1.1.0")
+}
 
-	r8("com.android.tools:r8:3.3.28")
+repositories {
+	jcenter()
 }
 
 application {
-	mainClass.set("link.infra.packwiz.installer.RequiresBootstrap")
+	mainClassName = "link.infra.packwiz.installer.RequiresBootstrap"
 }
 
 val gitVersion: groovy.lang.Closure<*> by extra
@@ -64,143 +59,79 @@ licenseReport {
 	filters = arrayOf<com.github.jk1.license.filter.DependencyFilter>(com.github.jk1.license.filter.LicenseBundleNormalizer())
 }
 
+// TODO: build relocated jar for minecraft launcher lib, non-relocated jar for packwiz-installer
+//tasks.register<com.github.jengelman.gradle.plugins.shadow.tasks.ConfigureShadowRelocation>("relocateShadowJar") {
+//	target = tasks.shadowJar.get()
+//	prefix = "link.infra.packwiz.deps"
+//}
+
+// Commons CLI and Minimal JSON are already included in packwiz-installer-bootstrap
 tasks.shadowJar {
-	// 4koma uses kotlin-reflect; requires Kotlin metadata
-	//exclude("**/*.kotlin_metadata")
-	//exclude("**/*.kotlin_builtins")
+	dependencies {
+		exclude(dependency("commons-cli:commons-cli:1.4"))
+		exclude(dependency("com.eclipsesource.minimal-json:minimal-json:0.9.5"))
+		// TODO: exclude meta inf files
+	}
+	exclude("**/*.kotlin_metadata")
+	exclude("**/*.kotlin_builtins")
 	exclude("META-INF/maven/**/*")
 	exclude("META-INF/proguard/**/*")
-
-	// Relocate Commons CLI, so that it doesn't clash with old packwiz-installer-bootstrap (that shades it)
-	relocate("org.apache.commons.cli", "link.infra.packwiz.installer.deps.commons-cli")
-
-	// from Commons CLI
-	exclude("META-INF/LICENSE.txt")
-	exclude("META-INF/NOTICE.txt")
+	//dependsOn(tasks.named("relocateShadowJar"))
 }
 
-val shrinkJar by tasks.registering(JavaExec::class) {
-	val rules = file("src/main/proguard.txt")
-	val r8File = base.libsDirectory.file(provider {
-		base.archivesName.get() + "-" + project.version + "-all-shrink.jar"
-	})
-	dependsOn(configurations.named("runtimeClasspath"))
-	inputs.files(tasks.shadowJar, rules)
-	outputs.file(r8File)
-
-	classpath(r8)
-	mainClass.set("com.android.tools.r8.R8")
-	args = mutableListOf(
-		"--release",
-		"--classfile",
-		"--output", r8File.get().toString(),
-		"--pg-conf", rules.toString(),
-		"--lib", System.getProperty("java.home"),
-		*(if (System.getProperty("java.version").startsWith("1.")) {
-			// javax.crypto, necessary on <1.9 for compiling Okio
-			arrayOf("--lib", System.getProperty("java.home") + "/lib/jce.jar")
-		} else { arrayOf() }),
-		tasks.shadowJar.get().archiveFile.get().asFile.toString()
-	)
+tasks.register<proguard.gradle.ProGuardTask>("shrinkJar") {
+	injars(tasks.shadowJar)
+	libraryjars(files(shrinkClasspath.files))
+	outjars("build/libs/" + tasks.shadowJar.get().outputs.files.first().name.removeSuffix(".jar") + "-shrink.jar")
+	if (System.getProperty("java.version").startsWith("1.")) {
+		libraryjars("${System.getProperty("java.home")}/lib/rt.jar")
+		libraryjars("${System.getProperty("java.home")}/lib/jce.jar")
+	} else {
+		throw RuntimeException("Compiling with Java 9+ not supported!")
 	}
 
-// MANIFEST.MF must be one of the first 2 entries in the zip for JarInputStream to see it
-// Gradle's JAR creation handles this whereas R8 doesn't, so the dist JAR is repacked
-val distJar by tasks.registering(Jar::class) {
-	from(shrinkJar.map { zipTree(it.outputs.files.singleFile) })
-	archiveClassifier.set("all-repacked")
-	manifest {
-		from(shrinkJar.map { zipTree(it.outputs.files.singleFile).matching {
-			include("META-INF/MANIFEST.MF")
-		}.singleFile })
-	}
-}
-
-artifacts {
-	add("distJarOutput", distJar) {
-		classifier = "dist"
-	}
+	keep("class link.infra.packwiz.installer.** { *; }")
+	dontoptimize()
+	dontobfuscate()
+	dontwarn("org.codehaus.mojo.animal_sniffer.*")
 }
 
 // Used for vscode launch.json
-val copyJar by tasks.registering(Copy::class) {
-	from(distJar)
+tasks.register<Copy>("copyJar") {
+	from(tasks.named("shrinkJar"))
 	rename("packwiz-installer-(.*)\\.jar", "packwiz-installer.jar")
-	into(layout.buildDirectory.dir("dist"))
-	outputs.file(layout.buildDirectory.dir("dist").map { it.file("packwiz-installer.jar") })
+	into("build/libs/")
 }
 
 tasks.build {
-	dependsOn(copyJar)
+	dependsOn("copyJar")
 }
 
+if (project.hasProperty("github.token")) {
 	githubRelease {
 		owner("comp500")
 		repo("packwiz-installer")
 		tagName("${project.version}")
 		releaseName("Release ${project.version}")
 		draft(true)
-	token(findProperty("github.token") as String?)
-	releaseAssets(layout.buildDirectory.dir("dist").map { it.file("packwiz-installer.jar") }.get())
+		token(findProperty("github.token") as String? ?: "")
+		releaseAssets(tasks.jar.get().destinationDirectory.file("packwiz-installer.jar").get())
 	}
 
 	tasks.githubRelease {
-	dependsOn(copyJar)
-	enabled = project.hasProperty("github.token") && project.findProperty("release") == "true"
+		dependsOn(tasks.build)
 	}
-
-tasks.publish {
-	dependsOn(tasks.githubRelease)
 }
 
 tasks.compileKotlin {
 	kotlinOptions {
 		jvmTarget = "1.8"
-		freeCompilerArgs = listOf("-Xjvm-default=all", "-Xallow-result-return-type", "-opt-in=kotlin.io.path.ExperimentalPathApi", "-Xlambdas=indy")
+		freeCompilerArgs = listOf("-Xjvm-default=enable")
 	}
 }
 tasks.compileTestKotlin {
 	kotlinOptions {
 		jvmTarget = "1.8"
-		freeCompilerArgs = listOf("-Xjvm-default=all", "-Xallow-result-return-type", "-opt-in=kotlin.io.path.ExperimentalPathApi", "-Xlambdas=indy")
+		freeCompilerArgs = listOf("-Xjvm-default=enable")
 	}
 }
-
-val javaComponent = components["java"] as AdhocComponentWithVariants
-javaComponent.addVariantsFromConfiguration(distJarOutput) {
-	mapToMavenScope("runtime")
-	mapToOptional()
-}
-javaComponent.withVariantsFromConfiguration(configurations["shadowRuntimeElements"]) {
-	skip()
-}
-
-if (project.hasProperty("bunnycdn.token")) {
-	publishing {
-		publications {
-			create<MavenPublication>("maven") {
-				groupId = "link.infra.packwiz"
-				artifactId = "packwiz-installer"
-
-				from(components["java"])
-			}
-		}
-		repositories {
-			maven {
-				url = if (project.findProperty("release") == "true") {
-					uri("https://storage.bunnycdn.com/comp-maven/repository/release")
-				} else {
-					uri("https://storage.bunnycdn.com/comp-maven/repository/snapshot")
-				}
-				credentials(HttpHeaderCredentials::class) {
-					name = "AccessKey"
-					value = findProperty("bunnycdn.token") as String?
-				}
-				authentication {
-					create<HttpHeaderAuthentication>("header")
-				}
-			}
-		}
-	}
-}
-

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,13 +1,13 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 #
-# Copyright © 2015-2021 the original authors.
+# Copyright 2015 the original author or authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
-#      https://www.apache.org/licenses/LICENSE-2.0
+#      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ -17,113 +17,78 @@
 #
 
 ##############################################################################
-#
-#   Gradle start up script for POSIX generated by Gradle.
-#
-#   Important for running:
-#
-#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
-#       noncompliant, but you have some other compliant shell such as ksh or
-#       bash, then to run this script, type that shell name before the whole
-#       command line, like:
-#
-#           ksh Gradle
-#
-#       Busybox and similar reduced shells will NOT work, because this script
-#       requires all of these POSIX shell features:
-#         * functions;
-#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
-#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
-#         * compound commands having a testable exit status, especially «case»;
-#         * various built-in commands including «command», «set», and «ulimit».
-#
-#   Important for patching:
-#
-#   (2) This script targets any POSIX shell, so it avoids extensions provided
-#       by Bash, Ksh, etc; in particular arrays are avoided.
-#
-#       The "traditional" practice of packing multiple parameters into a
-#       space-separated string is a well documented source of bugs and security
-#       problems, so this is (mostly) avoided, by progressively accumulating
-#       options in "$@", and eventually passing that to Java.
-#
-#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
-#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
-#       see the in-line comments for details.
-#
-#       There are tweaks for specific operating systems such as AIX, CygWin,
-#       Darwin, MinGW, and NonStop.
-#
-#   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
-#       within the Gradle project.
-#
-#       You can find Gradle at https://github.com/gradle/gradle/.
-#
+##
+##  Gradle start up script for UN*X
+##
 ##############################################################################
 
 # Attempt to set APP_HOME
-
 # Resolve links: $0 may be a link
-app_path=$0
-
-# Need this for daisy-chained symlinks.
-while
-    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
-    [ -h "$app_path" ]
-do
-    ls=$( ls -ld "$app_path" )
-    link=${ls#*' -> '}
-    case $link in             #(
-      /*)   app_path=$link ;; #(
-      *)    app_path=$APP_HOME$link ;;
-    esac
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
 done
-
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
 
 APP_NAME="Gradle"
-APP_BASE_NAME=${0##*/}
+APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD=maximum
+MAX_FD="maximum"
 
 warn () {
     echo "$*"
-} >&2
+}
 
 die () {
     echo
     echo "$*"
     echo
     exit 1
-} >&2
+}
 
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "$( uname )" in                #(
-  CYGWIN* )         cygwin=true  ;; #(
-  Darwin* )         darwin=true  ;; #(
-  MSYS* | MINGW* )  msys=true    ;; #(
-  NONSTOP* )        nonstop=true ;;
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
 esac
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
-
 # Determine the Java command to use to start the JVM.
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
         # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD=$JAVA_HOME/jre/sh/java
+        JAVACMD="$JAVA_HOME/jre/sh/java"
     else
-        JAVACMD=$JAVA_HOME/bin/java
+        JAVACMD="$JAVA_HOME/bin/java"
     fi
     if [ ! -x "$JAVACMD" ] ; then
         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -132,7 +97,7 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
     fi
 else
-    JAVACMD=java
+    JAVACMD="java"
     which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
@@ -140,95 +105,84 @@ location of your Java installation."
 fi
 
 # Increase the maximum file descriptors if we can.
-if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
-    case $MAX_FD in #(
-      max*)
-        MAX_FD=$( ulimit -H -n ) ||
-            warn "Could not query maximum file descriptor limit"
-    esac
-    case $MAX_FD in  #(
-      '' | soft) :;; #(
-      *)
-        ulimit -n "$MAX_FD" ||
-            warn "Could not set maximum file descriptor limit to $MAX_FD"
-    esac
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
 fi
 
-# Collect all arguments for the java command, stacking in reverse order:
-#   * args from the command line
-#   * the main class name
-#   * -classpath
-#   * -D...appname settings
-#   * --module-path (only if needed)
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
-
-# For Cygwin or MSYS, switch paths to Windows format before running java
-if "$cygwin" || "$msys" ; then
-    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
-    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
-
-    JAVACMD=$( cygpath --unix "$JAVACMD" )
-
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    for arg do
-        if
-            case $arg in                                #(
-              -*)   false ;;                            # don't mess with options #(
-              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
-                    [ -e "$t" ] ;;                      #(
-              *)    false ;;
-            esac
-        then
-            arg=$( cygpath --path --ignore --mixed "$arg" )
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
 fi
-        # Roll the args list around exactly as many times as the number of
-        # args, so each arg winds up back in the position where it started, but
-        # possibly modified.
-        #
-        # NB: a `for` loop captures its iteration list before it begins, so
-        # changing the positional parameters here affects neither the number of
-        # iterations, nor the values presented in `arg`.
-        shift                   # remove old arg
-        set -- "$@" "$arg"      # push replacement arg
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
     done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
 fi
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
 
-set -- \
-        "-Dorg.gradle.appname=$APP_BASE_NAME" \
-        -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
-        "$@"
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
 
-# Use "xargs" to parse quoted args.
-#
-# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
-#
-# In Bash we could simply go:
-#
-#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
-#   set -- "${ARGS[@]}" "$@"
-#
-# but POSIX shell has neither arrays nor command substitution, so instead we
-# post-process each arg (as a line of input to sed) to backslash-escape any
-# character that might be a shell metacharacter, then use eval to reverse
-# that process (while maintaining the separation between arguments), and wrap
-# the whole thing up as a single "set" statement.
-#
-# This will of course break if any of these variables contains a newline or
-# an unmatched quote.
-#
-
-eval "set -- $(
-        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
-        xargs -n1 |
-        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
-        tr '\n' ' '
-    )" '"$@"'
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
 
 exec "$JAVACMD" "$@"

gradlew.bat

@@ -5,7 +5,7 @@
 @rem you may not use this file except in compliance with the License.
 @rem You may obtain a copy of the License at
 @rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem      http://www.apache.org/licenses/LICENSE-2.0
 @rem
 @rem Unless required by applicable law or agreed to in writing, software
 @rem distributed under the License is distributed on an "AS IS" BASIS,
@@ -29,9 +29,6 @@ if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
-@rem Resolve any "." and ".." in APP_HOME to make it shorter.
-for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
-
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
@@ -40,7 +37,7 @@ if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
+if "%ERRORLEVEL%" == "0" goto init
 
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
@@ -54,7 +51,7 @@ goto fail
 set JAVA_HOME=%JAVA_HOME:"=%
 set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
-if exist "%JAVA_EXE%" goto execute
+if exist "%JAVA_EXE%" goto init
 
 echo.
 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
@@ -64,14 +61,28 @@ echo location of your Java installation.
 
 goto fail
 
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
 :execute
 @rem Setup the command line
 
 set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
-
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
 
 :end
 @rem End local scope for the variables with windows NT shell

src/main/java/link/infra/packwiz/installer/RequiresBootstrap.java

@@ -8,6 +8,8 @@ public class RequiresBootstrap {
 	public static void main(String[] args) {
 		// Very small CLI implementation, because Commons CLI complains on unexpected
 		// options
+		// Also so that Commons CLI can be excluded from the shaded JAR, as it is
+		// included in the bootstrap
 		if (Arrays.stream(args).map(str -> {
 			if (str == null) return "";
 			if (str.startsWith("--")) {

src/main/kotlin/link/infra/packwiz/installer/DevMain.kt

@@ -1,5 +0,0 @@
-package link.infra.packwiz.installer
-
-fun main(args: Array<String>) {
-	Main(args)
-}

src/main/kotlin/link/infra/packwiz/installer/DownloadTask.kt

@@ -2,57 +2,41 @@ package link.infra.packwiz.installer
 
 import link.infra.packwiz.installer.metadata.IndexFile
 import link.infra.packwiz.installer.metadata.ManifestFile
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
 import link.infra.packwiz.installer.metadata.hash.Hash
-import link.infra.packwiz.installer.metadata.hash.HashFormat
-import link.infra.packwiz.installer.request.RequestException
-import link.infra.packwiz.installer.target.ClientHolder
-import link.infra.packwiz.installer.target.Side
-import link.infra.packwiz.installer.target.path.PackwizFilePath
+import link.infra.packwiz.installer.metadata.hash.HashUtils.getHash
+import link.infra.packwiz.installer.metadata.hash.HashUtils.getHasher
 import link.infra.packwiz.installer.ui.data.ExceptionDetails
 import link.infra.packwiz.installer.ui.data.IOptionDetails
 import link.infra.packwiz.installer.util.Log
 import okio.Buffer
 import okio.HashingSink
-import okio.blackholeSink
 import okio.buffer
 import java.io.IOException
 import java.nio.file.Files
+import java.nio.file.Paths
 import java.nio.file.StandardCopyOption
+import java.util.*
 
-internal class DownloadTask private constructor(val metadata: IndexFile.File, val index: IndexFile, private val downloadSide: Side) : IOptionDetails {
+internal class DownloadTask private constructor(val metadata: IndexFile.File, defaultFormat: String, private val downloadSide: UpdateManager.Options.Side) : IOptionDetails {
 	var cachedFile: ManifestFile.File? = null
-		private set
 
 	private var err: Exception? = null
 	val exceptionDetails get() = err?.let { e -> ExceptionDetails(name, e) }
 
 	fun failed() = err != null
 
-	var alreadyUpToDate = false
-		private set
+	private var alreadyUpToDate = false
 	private var metadataRequired = true
 	private var invalidated = false
 	// If file is new or isOptional changed to true, the option needs to be presented again
 	private var newOptional = true
-	var completionStatus = CompletionStatus.INCOMPLETE
-		private set
 
-	enum class CompletionStatus {
-		INCOMPLETE,
-		DOWNLOADED,
-		ALREADY_EXISTS_CACHED,
-		ALREADY_EXISTS_VALIDATED,
-		SKIPPED_DISABLED,
-		SKIPPED_WRONG_SIDE,
-		DELETED_DISABLED,
-		DELETED_WRONG_SIDE;
-	}
-
-	val isOptional get() = metadata.linkedFile?.option?.optional ?: false
+	val isOptional get() = metadata.linkedFile?.isOptional ?: false
 
 	fun isNewOptional() = isOptional && newOptional
 
-	fun correctSide() = metadata.linkedFile?.side?.let { downloadSide.hasSide(it) } ?: true
+	fun correctSide() = metadata.linkedFile?.side?.hasSide(downloadSide) ?: true
 
 	override val name get() = metadata.name
 
@@ -68,6 +52,12 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 
 	override val optionDescription get() = metadata.linkedFile?.option?.description ?: ""
 
+	init {
+		if (metadata.hashFormat?.isEmpty() != false) {
+			metadata.hashFormat = defaultFormat
+		}
+	}
+
 	fun invalidate() {
 		invalidated = true
 		alreadyUpToDate = false
@@ -83,7 +73,7 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 		this.cachedFile = cachedFile
 		if (!invalidated) {
 			val currHash = try {
-				metadata.getHashObj(index)
+				getHash(metadata.hashFormat!!, metadata.hash!!)
 			} catch (e: Exception) {
 				err = e
 				return
@@ -91,7 +81,6 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 			if (currHash == cachedFile.hash) { // Already up to date
 				alreadyUpToDate = true
 				metadataRequired = false
-				completionStatus = CompletionStatus.ALREADY_EXISTS_CACHED
 			}
 		}
 		if (cachedFile.isOptional) {
@@ -101,13 +90,13 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 		}
 	}
 
-	fun downloadMetadata(clientHolder: ClientHolder) {
+	fun downloadMetadata(parentIndexFile: IndexFile, indexUri: SpaceSafeURI) {
 		if (err != null) return
 
 		if (metadataRequired) {
 			try {
 				// Retrieve the linked metadata file
-				metadata.downloadMeta(index, clientHolder)
+				metadata.downloadMeta(parentIndexFile, indexUri)
 			} catch (e: Exception) {
 				err = e
 				return
@@ -115,14 +104,15 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 			cachedFile?.let { cachedFile ->
 				val linkedFile = metadata.linkedFile
 				if (linkedFile != null) {
-					if (linkedFile.option.optional) {
+					linkedFile.option?.let { opt ->
+						if (opt.optional) {
 							if (cachedFile.isOptional) {
 								// isOptional didn't change
 								newOptional = false
 							} else {
 								// isOptional false -> true, set option to it's default value
 								// TODO: preserve previous option value, somehow??
-							cachedFile.optionValue = linkedFile.option.defaultValue
+								cachedFile.optionValue = opt.defaultValue
 							}
 						}
 					}
@@ -131,118 +121,56 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 				}
 			}
 		}
-
-	/**
-	 * Check if the file in the destination location is already valid
-	 * Must be done after metadata retrieval
-	 */
-	fun validateExistingFile(packFolder: PackwizFilePath, clientHolder: ClientHolder) {
-		if (!alreadyUpToDate) {
-			try {
-				// TODO: only do this for files that didn't exist before or have been modified since last full update?
-				val destPath = metadata.destURI.rebase(packFolder)
-				destPath.source(clientHolder).use { src ->
-					// TODO: clean up duplicated code
-					val hash: Hash<*>
-					val fileHashFormat: HashFormat<*>
-					val linkedFile = metadata.linkedFile
-
-					if (linkedFile != null) {
-						hash = linkedFile.hash
-						fileHashFormat = linkedFile.download.hashFormat
-					} else {
-						hash = metadata.getHashObj(index)
-						fileHashFormat = metadata.hashFormat(index)
 	}
 
-					val fileSource = fileHashFormat.source(src)
-					fileSource.buffer().readAll(blackholeSink())
-					if (hash == fileSource.hash) {
-						alreadyUpToDate = true
-						completionStatus = CompletionStatus.ALREADY_EXISTS_VALIDATED
-
-						// Update the manifest file
-						cachedFile = (cachedFile ?: ManifestFile.File()).also {
-							try {
-								it.hash = metadata.getHashObj(index)
-							} catch (e: Exception) {
-								err = e
-								return
-							}
-							it.isOptional = isOptional
-							it.cachedLocation = metadata.destURI.rebase(packFolder)
-							metadata.linkedFile?.let { linked ->
-								try {
-									it.linkedFileHash = linked.hash
-								} catch (e: Exception) {
-									err = e
-								}
-							}
-						}
-					}
-				}
-			} catch (e: RequestException) {
-				// Ignore exceptions; if the file doesn't exist we'll be downloading it
-			} catch (e: IOException) {
-				// Ignore exceptions; if the file doesn't exist we'll be downloading it
-			}
-		}
-	}
-
-	fun download(packFolder: PackwizFilePath, clientHolder: ClientHolder) {
+	fun download(packFolder: String, indexUri: SpaceSafeURI) {
 		if (err != null) return
 
-		// Exclude wrong-side and optional false files
+		// TODO: is this necessary if we overwrite?
+		// Ensure it is removed
 		cachedFile?.let {
-			if ((it.isOptional && !it.optionValue) || !correctSide()) {
-				if (it.cachedLocation != null) {
-					// Ensure wrong-side or optional false files are removed
+			if (!it.optionValue || !correctSide()) {
+				if (it.cachedLocation == null) return
+
 				try {
-						completionStatus = if (Files.deleteIfExists(it.cachedLocation!!.nioPath)) {
-							if (correctSide()) { CompletionStatus.DELETED_DISABLED } else { CompletionStatus.DELETED_WRONG_SIDE }
-						} else {
-							if (correctSide()) { CompletionStatus.SKIPPED_DISABLED } else { CompletionStatus.SKIPPED_WRONG_SIDE }
-						}
+					Files.deleteIfExists(Paths.get(packFolder, it.cachedLocation))
 				} catch (e: IOException) {
-						Log.warn("Failed to delete file", e)
-					}
-				} else {
-					completionStatus =
-						if (correctSide()) { CompletionStatus.SKIPPED_DISABLED }
-						else { CompletionStatus.SKIPPED_WRONG_SIDE }
+					Log.warn("Failed to delete file before downloading", e)
 				}
 				it.cachedLocation = null
-				return
 			}
 		}
 		if (alreadyUpToDate) return
 
-		val destPath = metadata.destURI.rebase(packFolder)
+		// TODO: should I be validating JSON properly, or this fine!!!!!!!??
+		assert(metadata.destURI != null)
+		val destPath = Paths.get(packFolder, metadata.destURI.toString())
 
 		// Don't update files marked with preserve if they already exist on disk
 		if (metadata.preserve) {
-			if (destPath.nioPath.toFile().exists()) {
+			if (destPath.toFile().exists()) {
 				return
 			}
 		}
 
+		// TODO: if already exists and has correct hash, ignore?
 		// TODO: add .disabled support?
 
 		try {
-			val hash: Hash<*>
-			val fileHashFormat: HashFormat<*>
+			val hash: Hash
+			val fileHashFormat: String
 			val linkedFile = metadata.linkedFile
 
 			if (linkedFile != null) {
 				hash = linkedFile.hash
-				fileHashFormat = linkedFile.download.hashFormat
+				fileHashFormat = Objects.requireNonNull(Objects.requireNonNull(linkedFile.download)!!.hashFormat)!!
 			} else {
-				hash = metadata.getHashObj(index)
-				fileHashFormat = metadata.hashFormat(index)
+				hash = metadata.getHashObj()
+				fileHashFormat = Objects.requireNonNull(metadata.hashFormat)!!
 			}
 
-			val src = metadata.getSource(clientHolder)
-			val fileSource = fileHashFormat.source(src)
+			val src = metadata.getSource(indexUri)
+			val fileSource = getHasher(fileHashFormat).getHashingSource(src)
 			val data = Buffer()
 
 			// Read all the data into a buffer (very inefficient for large files! but allows rollback if hash check fails)
@@ -251,16 +179,16 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 				it.readAll(data)
 			}
 
-			if (hash == fileSource.hash) {
+			if (fileSource.hashIsEqual(hash)) {
 				// isDirectory follows symlinks, but createDirectories doesn't
 				try {
-					Files.createDirectories(destPath.parent.nioPath)
+					Files.createDirectories(destPath.parent)
 				} catch (e: java.nio.file.FileAlreadyExistsException) {
-					if (!Files.isDirectory(destPath.parent.nioPath)) {
+					if (!Files.isDirectory(destPath.parent)) {
 						throw e
 					}
 				}
-				Files.copy(data.inputStream(), destPath.nioPath, StandardCopyOption.REPLACE_EXISTING)
+				Files.copy(data.inputStream(), destPath, StandardCopyOption.REPLACE_EXISTING)
 				data.clear()
 			} else {
 				// TODO: move println to something visible in the error window
@@ -268,7 +196,7 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 				println("Calculated: " + fileSource.hash)
 				println("Expected:   $hash")
 				// Attempt to get the SHA256 hash
-				val sha256 = HashingSink.sha256(blackholeSink())
+				val sha256 = HashingSink.sha256(okio.blackholeSink())
 				data.readAll(sha256)
 				println("SHA256 hash value: " + sha256.hash)
 				err = Exception("Hash invalid!")
@@ -276,10 +204,10 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 				return
 			}
 			cachedFile?.cachedLocation?.let {
-				if (destPath != it) {
+				if (destPath != Paths.get(packFolder, it)) {
 					// Delete old file if location changes
 					try {
-						Files.delete(cachedFile!!.cachedLocation!!.nioPath)
+						Files.delete(Paths.get(packFolder, cachedFile!!.cachedLocation))
 					} catch (e: IOException) {
 						// Continue, as it was probably already deleted?
 						// TODO: log it
@@ -294,13 +222,13 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 		// Update the manifest file
 		cachedFile = (cachedFile ?: ManifestFile.File()).also {
 			try {
-				it.hash = metadata.getHashObj(index)
+				it.hash = metadata.getHashObj()
 			} catch (e: Exception) {
 				err = e
 				return
 			}
 			it.isOptional = isOptional
-			it.cachedLocation = metadata.destURI.rebase(packFolder)
+			it.cachedLocation = metadata.destURI.toString()
 			metadata.linkedFile?.let { linked ->
 				try {
 					it.linkedFileHash = linked.hash
@@ -309,15 +237,14 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, va
 				}
 			}
 		}
-
-		completionStatus = CompletionStatus.DOWNLOADED
 	}
 
 	companion object {
-		fun createTasksFromIndex(index: IndexFile, downloadSide: Side): MutableList<DownloadTask> {
+		@JvmStatic
+		fun createTasksFromIndex(index: IndexFile, defaultFormat: String, downloadSide: UpdateManager.Options.Side): List<DownloadTask> {
 			val tasks = ArrayList<DownloadTask>()
-			for (file in index.files) {
-				tasks.add(DownloadTask(file, index, downloadSide))
+			for (file in Objects.requireNonNull(index.files)) {
+				tasks.add(DownloadTask(file, defaultFormat, downloadSide))
 			}
 			return tasks
 		}

src/main/kotlin/link/infra/packwiz/installer/LauncherUtils.kt

@@ -1,142 +0,0 @@
-package link.infra.packwiz.installer
-
-import com.google.gson.Gson
-import com.google.gson.JsonIOException
-import com.google.gson.JsonParser
-import com.google.gson.JsonSyntaxException
-import link.infra.packwiz.installer.metadata.PackFile
-import link.infra.packwiz.installer.ui.IUserInterface
-import link.infra.packwiz.installer.util.Log
-import kotlin.io.path.reader
-import kotlin.io.path.writeText
-
-class LauncherUtils internal constructor(private val opts: UpdateManager.Options, val ui: IUserInterface) {
-	enum class LauncherStatus {
-		SUCCESSFUL,
-		NO_CHANGES,
-		CANCELLED,
-		NOT_FOUND, // When there is no mmc-pack.json file found (i.e. MultiMC is not being used)
-	}
-
-	fun handleMultiMC(pf: PackFile, gson: Gson): LauncherStatus {
-		// MultiMC MC and loader version checker
-		val manifestPath = opts.multimcFolder / "mmc-pack.json"
-
-		if (!manifestPath.nioPath.toFile().exists()) {
-			return LauncherStatus.NOT_FOUND
-		}
-
-		val multimcManifest = manifestPath.nioPath.reader().use {
-			try {
-				JsonParser.parseReader(it)
-			} catch (e: JsonIOException) {
-				throw Exception("Cannot read the MultiMC pack file", e)
-			} catch (e: JsonSyntaxException) {
-				throw Exception("Invalid MultiMC pack file", e)
-			}.asJsonObject
-		}
-
-		Log.info("Loaded MultiMC config")
-
-		// We only support format 1, if it gets updated in the future we'll have to handle that
-		// There's only version 1 for now tho, so that's good
-		if (multimcManifest["formatVersion"]?.asInt != 1) {
-			throw Exception("Unsupported MultiMC format version ${multimcManifest["formatVersion"]}")
-		}
-
-		var manifestModified = false
-		val modLoaders = hashMapOf(
-			"net.minecraft" to "minecraft",
-			"net.minecraftforge" to "forge",
-			"net.neoforged" to "neoforge",
-			"net.fabricmc.fabric-loader" to "fabric",
-			"org.quiltmc.quilt-loader" to "quilt",
-			"com.mumfrey.liteloader" to "liteloader"
-		)
-		// MultiMC requires components to be sorted; this is defined in the MultiMC meta repo, but they seem to
-		// be the same for every version so they are just used directly here
-		val componentOrders = mapOf(
-			"net.minecraft" to -2,
-			"org.lwjgl" to -1,
-			"org.lwjgl3" to -1,
-			"net.minecraftforge" to 5,
-			"net.neoforged" to 5,
-			"net.fabricmc.fabric-loader" to 10,
-			"org.quiltmc.quilt-loader" to 10,
-			"com.mumfrey.liteloader" to 10,
-			"net.fabricmc.intermediary" to 11
-		)
-		val modLoadersClasses = modLoaders.entries.associate{(k,v)-> v to k}
-		val loaderVersionsFound = HashMap<String, String?>()
-		val outdatedLoaders = mutableSetOf<String>()
-		val components = multimcManifest["components"]?.asJsonArray ?: throw Exception("Invalid mmc-pack.json: no components key")
-		components.removeAll {
-			val component = it.asJsonObject
-
-			val version = component["version"]?.asString
-			// If we find any of the modloaders we support, we save it and check the version
-			if (modLoaders.containsKey(component["uid"]?.asString)) {
-				val modLoader = modLoaders.getValue(component["uid"]!!.asString)
-				loaderVersionsFound[modLoader] = version
-				if (version != pf.versions[modLoader]) {
-					outdatedLoaders.add(modLoader)
-					true // Delete component; cached metadata is invalid and will be re-added
-				} else {
-					false // Already up to date; cached metadata is valid
-				}
-			} else { false } // Not a known loader / MC
-		}
-
-		for ((_, loader) in modLoaders
-			.filter {
-				(!loaderVersionsFound.containsKey(it.value) || outdatedLoaders.contains(it.value)) && pf.versions.containsKey(it.value)
-			}
-		) {
-			manifestModified = true
-			components.add(gson.toJsonTree(
-				hashMapOf("uid" to modLoadersClasses[loader], "version" to pf.versions[loader]))
-			)
-		}
-
-		// If inconsistent Intermediary mappings version is found, delete it - MultiMC will add and re-dl the correct one
-		components.find { it.isJsonObject && it.asJsonObject["uid"]?.asString == "net.fabricmc.intermediary" }?.let {
-			if (it.asJsonObject["version"]?.asString != pf.versions["minecraft"]) {
-				components.remove(it)
-				manifestModified = true
-			}
-		}
-
-		if (manifestModified) {
-			// Sort manifest by component order
-			val sortedComponents = components.sortedWith(nullsLast(compareBy {
-				if (it.isJsonObject) {
-					componentOrders[it.asJsonObject["uid"]?.asString]
-				} else { null }
-			}))
-			components.removeAll { true }
-			sortedComponents.forEach { components.add(it) }
-
-			// The manifest has been modified, so before saving it we'll ask the user
-			// if they wanna update it, continue without updating it, or exit
-			val oldVers = loaderVersionsFound.map { Pair(it.key, it.value) }
-			val newVers = pf.versions.map { Pair(it.key, it.value) }
-
-			when (ui.showUpdateConfirmationDialog(oldVers, newVers)) {
-				IUserInterface.UpdateConfirmationResult.CANCELLED -> {
-					return LauncherStatus.CANCELLED
-				}
-				IUserInterface.UpdateConfirmationResult.CONTINUE -> {
-					return LauncherStatus.SUCCESSFUL
-				}
-				else -> {}
-			}
-
-			manifestPath.nioPath.writeText(gson.toJson(multimcManifest))
-			Log.info("Successfully updated mmc-pack.json based on version metadata")
-
-			return LauncherStatus.SUCCESSFUL
-		}
-
-		return LauncherStatus.NO_CHANGES
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/Main.kt

@@ -2,23 +2,16 @@
 
 package link.infra.packwiz.installer
 
-import link.infra.packwiz.installer.target.Side
-import link.infra.packwiz.installer.target.path.HttpUrlPath
-import link.infra.packwiz.installer.target.path.PackwizFilePath
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
 import link.infra.packwiz.installer.ui.cli.CLIHandler
 import link.infra.packwiz.installer.ui.gui.GUIHandler
-import link.infra.packwiz.installer.ui.wrap
 import link.infra.packwiz.installer.util.Log
-import okhttp3.HttpUrl.Companion.toHttpUrl
-import okio.Path.Companion.toOkioPath
-import okio.Path.Companion.toPath
 import org.apache.commons.cli.DefaultParser
 import org.apache.commons.cli.Options
 import org.apache.commons.cli.ParseException
 import java.awt.EventQueue
 import java.awt.GraphicsEnvironment
-import java.net.URI
-import java.nio.file.Paths
+import java.net.URISyntaxException
 import javax.swing.JOptionPane
 import javax.swing.UIManager
 import kotlin.system.exitProcess
@@ -72,44 +65,20 @@ class Main(args: Array<String>) {
 
 		ui.show()
 
-		val packFileRaw = unparsedArgs[0]
-
-		val packFile = when {
-			// HTTP(s) URLs
-			Regex("^https?://", RegexOption.IGNORE_CASE).containsMatchIn(packFileRaw) -> ui.wrap("Invalid HTTP/HTTPS URL for pack file: $packFileRaw") {
-				HttpUrlPath(packFileRaw.toHttpUrl().resolve(".")!!, packFileRaw.toHttpUrl().pathSegments.last())
-			}
-			// File URIs (uses same logic as old packwiz-installer, for backwards compat)
-			Regex("^file:", RegexOption.IGNORE_CASE).containsMatchIn(packFileRaw) -> {
-				ui.wrap("Failed to parse file path for pack file: $packFileRaw") {
-					val path = Paths.get(URI(packFileRaw)).toOkioPath()
-					PackwizFilePath(path.parent ?: ui.showErrorAndExit("Invalid pack file path: $packFileRaw"), path.name)
-				}
-			}
-			// Other URIs (unsupported)
-			Regex("^[a-z][a-z\\d+\\-.]*://", RegexOption.IGNORE_CASE).containsMatchIn(packFileRaw) -> ui.showErrorAndExit("Unsupported scheme for pack file: $packFileRaw")
-			// None of the above matches -> interpret as file path
-			else -> PackwizFilePath(packFileRaw.toPath().parent ?: ui.showErrorAndExit("Invalid pack file path: $packFileRaw"), packFileRaw.toPath().name)
-		}
-		val side = cmd.getOptionValue("side")?.let {
-			Side.from(it) ?: ui.showErrorAndExit("Unknown side name: $it")
-		} ?: Side.CLIENT
-		val packFolder = ui.wrap("Invalid pack folder path") {
-			cmd.getOptionValue("pack-folder")?.let{ PackwizFilePath(it.toPath()) } ?: PackwizFilePath(".".toPath())
-		}
-		val multimcFolder = ui.wrap("Invalid MultiMC folder path") {
-			cmd.getOptionValue("multimc-folder")?.let{ PackwizFilePath(it.toPath()) } ?: PackwizFilePath("..".toPath())
-		}
-		val manifestFile = ui.wrap("Invalid manifest file path") {
-			packFolder / (cmd.getOptionValue("meta-file") ?: "packwiz.json")
-		}
-		val timeout = ui.wrap("Invalid timeout value") {
-			cmd.getOptionValue("timeout")?.toLong() ?: 10
+		val uOptions = try {
+			UpdateManager.Options.construct(
+				downloadURI = SpaceSafeURI(unparsedArgs[0]),
+				side = cmd.getOptionValue("side")?.let((UpdateManager.Options.Side)::from),
+				packFolder = cmd.getOptionValue("pack-folder"),
+				manifestFile = cmd.getOptionValue("meta-file")
+			)
+		} catch (e: URISyntaxException) {
+			ui.showErrorAndExit("Failed to read pack.toml URI", e)
 		}
 
 		// Start update process!
 		try {
-			UpdateManager(UpdateManager.Options(packFile, manifestFile, packFolder, multimcFolder, side, timeout), ui)
+			UpdateManager(uOptions, ui)
 		} catch (e: Exception) {
 			ui.showErrorAndExit("Update process failed", e)
 		}
@@ -124,9 +93,7 @@ class Main(args: Array<String>) {
 			options.addOption("s", "side", true, "Side to install mods from (client/server, defaults to client)")
 			options.addOption(null, "title", true, "Title of the installer window")
 			options.addOption(null, "pack-folder", true, "Folder to install the pack to (defaults to the JAR directory)")
-			options.addOption(null, "multimc-folder", true, "The MultiMC pack folder (defaults to the parent of the pack directory)")
 			options.addOption(null, "meta-file", true, "JSON file to store pack metadata, relative to the pack folder (defaults to packwiz.json)")
-			options.addOption("t", "timeout", true, "Seconds to wait before automatically launching when asking about optional mods (defaults to 10)")
 		}
 
 		// TODO: link these somehow so they're only defined once?
@@ -139,12 +106,6 @@ class Main(args: Array<String>) {
 			options.addOption("g", "no-gui", false, "Don't display a GUI to show update progress")
 			options.addOption("h", "help", false, "Display this message") // Implemented in packwiz-installer-bootstrap!
 		}
-
-		@JvmStatic
-		fun main(args: Array<String>) {
-			Log.info("packwiz-installer was started without packwiz-installer-bootstrap. Use the bootstrapper for automatic updates! (Disregard this message if you have your own update mechanism)")
-			Main(args)
-		}
 	}
 
 	// Actual main() is in RequiresBootstrap!

src/main/kotlin/link/infra/packwiz/installer/UpdateManager.kt

@@ -1,32 +1,35 @@
 package link.infra.packwiz.installer
 
-import cc.ekblad.toml.decode
 import com.google.gson.GsonBuilder
 import com.google.gson.JsonIOException
 import com.google.gson.JsonSyntaxException
+import com.google.gson.annotations.SerializedName
+import com.moandjiezana.toml.Toml
 import link.infra.packwiz.installer.DownloadTask.Companion.createTasksFromIndex
-import link.infra.packwiz.installer.metadata.DownloadMode
 import link.infra.packwiz.installer.metadata.IndexFile
 import link.infra.packwiz.installer.metadata.ManifestFile
 import link.infra.packwiz.installer.metadata.PackFile
-import link.infra.packwiz.installer.metadata.curseforge.resolveCfMetadata
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
 import link.infra.packwiz.installer.metadata.hash.Hash
-import link.infra.packwiz.installer.metadata.hash.HashFormat
-import link.infra.packwiz.installer.request.RequestException
-import link.infra.packwiz.installer.target.ClientHolder
-import link.infra.packwiz.installer.target.Side
-import link.infra.packwiz.installer.target.path.PackwizFilePath
-import link.infra.packwiz.installer.target.path.PackwizPath
+import link.infra.packwiz.installer.metadata.hash.HashUtils.getHash
+import link.infra.packwiz.installer.metadata.hash.HashUtils.getHasher
+import link.infra.packwiz.installer.request.HandlerManager.getFileSource
+import link.infra.packwiz.installer.request.HandlerManager.getNewLoc
 import link.infra.packwiz.installer.ui.IUserInterface
 import link.infra.packwiz.installer.ui.IUserInterface.CancellationResult
 import link.infra.packwiz.installer.ui.IUserInterface.ExceptionListResult
 import link.infra.packwiz.installer.ui.data.InstallProgress
 import link.infra.packwiz.installer.util.Log
+import link.infra.packwiz.installer.util.ifletOrErr
+import link.infra.packwiz.installer.util.ifletOrWarn
 import okio.buffer
+import java.io.FileNotFoundException
+import java.io.FileReader
+import java.io.FileWriter
 import java.io.IOException
-import java.io.InputStreamReader
-import java.nio.charset.StandardCharsets
 import java.nio.file.Files
+import java.nio.file.Paths
+import java.util.*
 import java.util.concurrent.CompletionService
 import java.util.concurrent.ExecutionException
 import java.util.concurrent.ExecutorCompletionService
@@ -43,33 +46,78 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 	}
 
 	data class Options(
-		val packFile: PackwizPath<*>,
-		val manifestFile: PackwizFilePath,
-		val packFolder: PackwizFilePath,
-		val multimcFolder: PackwizFilePath,
-		val side: Side,
-		val timeout: Long,
-	)
-
-	// TODO: make this return a value based on results?
-	private fun start() {
-		val clientHolder = ClientHolder()
-		ui.cancelCallback = {
-			clientHolder.close()
+		val downloadURI: SpaceSafeURI,
+		val manifestFile: String,
+		val packFolder: String,
+		val side: Side
+	) {
+		// Horrible workaround for default params not working cleanly with nullable values
+		companion object {
+			fun construct(downloadURI: SpaceSafeURI, manifestFile: String?, packFolder: String?, side: Side?) =
+				Options(downloadURI, manifestFile ?: "packwiz.json", packFolder ?: ".", side ?: Side.CLIENT)
 		}
 
+		enum class Side {
+			@SerializedName("client")
+			CLIENT("client"),
+			@SerializedName("server")
+			SERVER("server"),
+			@SerializedName("both")
+			@Suppress("unused")
+			BOTH("both", arrayOf(CLIENT, SERVER));
+
+			private val sideName: String
+			private val depSides: Array<Side>?
+
+			constructor(sideName: String) {
+				this.sideName = sideName.toLowerCase()
+				depSides = null
+			}
+
+			constructor(sideName: String, depSides: Array<Side>) {
+				this.sideName = sideName.toLowerCase()
+				this.depSides = depSides
+			}
+
+			override fun toString() = sideName
+
+			fun hasSide(tSide: Side): Boolean {
+				if (this == tSide) {
+					return true
+				}
+				if (depSides != null) {
+					for (depSide in depSides) {
+						if (depSide == tSide) {
+							return true
+						}
+					}
+				}
+				return false
+			}
+
+			companion object {
+				fun from(name: String): Side? {
+					val lowerName = name.toLowerCase()
+					for (side in values()) {
+						if (side.sideName == lowerName) {
+							return side
+						}
+					}
+					return null
+				}
+			}
+		}
+	}
+
+	private fun start() {
+		checkOptions()
+
 		ui.submitProgress(InstallProgress("Loading manifest file..."))
-		val gson = GsonBuilder()
-			.registerTypeAdapter(Hash::class.java, Hash.TypeHandler())
-			.registerTypeAdapter(PackwizFilePath::class.java, PackwizPath.adapterRelativeTo(opts.packFolder))
-			.enableComplexMapKeySerialization()
-			.create()
+		val gson = GsonBuilder().registerTypeAdapter(Hash::class.java, Hash.TypeHandler()).create()
 		val manifest = try {
-			// TODO: kotlinx.serialisation?
-			InputStreamReader(opts.manifestFile.source(clientHolder).inputStream(), StandardCharsets.UTF_8).use { reader ->
-				gson.fromJson(reader, ManifestFile::class.java)
-			}
-		} catch (e: RequestException.Response.File.FileNotFound) {
+			gson.fromJson(FileReader(Paths.get(opts.packFolder, opts.manifestFile).toString()),
+					ManifestFile::class.java)
+		} catch (e: FileNotFoundException) {
 			ui.firstInstall = true
 			ManifestFile()
 		} catch (e: JsonSyntaxException) {
@@ -85,15 +133,14 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 
 		ui.submitProgress(InstallProgress("Loading pack file..."))
 		val packFileSource = try {
-			val src = opts.packFile.source(clientHolder)
-			HashFormat.SHA256.source(src)
+			val src = getFileSource(opts.downloadURI)
+			getHasher("sha256").getHashingSource(src)
 		} catch (e: Exception) {
-			// TODO: ensure suppressed/caused exceptions are shown?
 			ui.showErrorAndExit("Failed to download pack.toml", e)
 		}
 		val pf = packFileSource.buffer().use {
 			try {
-				PackFile.mapper(opts.packFile).decode<PackFile>(it.inputStream())
+				Toml().read(it.inputStream()).to(PackFile::class.java)
 			} catch (e: IllegalStateException) {
 				ui.showErrorAndExit("Failed to parse pack.toml", e)
 			}
@@ -104,34 +151,10 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			handleCancellation()
 		}
 
-		// Launcher checks
-		val lu = LauncherUtils(opts, ui)
-
-		// MultiMC MC and loader version checker
-		ui.submitProgress(InstallProgress("Loading MultiMC pack file..."))
-		try {
-			when (lu.handleMultiMC(pf, gson)) {
-				LauncherUtils.LauncherStatus.CANCELLED -> cancelled = true
-				LauncherUtils.LauncherStatus.NOT_FOUND -> Log.info("MultiMC not detected")
-				else -> {}
-			}
-			handleCancellation()
-		} catch (e: Exception) {
-			ui.showErrorAndExit(e.message!!, e)
-		}
-
-		if (ui.cancelButtonPressed) {
-			showCancellationDialog()
-			handleCancellation()
-		}
-
 		ui.submitProgress(InstallProgress("Checking local files..."))
 
-		// If the side changes, invalidate EVERYTHING (even when the index hasn't changed)
-		val invalidateAll = opts.side != manifest.cachedSide
-		val invalidatedUris: MutableList<PackwizFilePath> = ArrayList()
-		if (!invalidateAll) {
 		// Invalidation checking must be done here, as it must happen before pack/index hashes are checked
+		val invalidatedUris: MutableList<SpaceSafeURI> = ArrayList()
 		for ((fileUri, file) in manifest.cachedFiles) {
 			// ignore onlyOtherSide files
 			if (file.onlyOtherSide) {
@@ -142,7 +165,7 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			// if isn't optional, or is optional but optionValue == true
 			if (!file.isOptional || file.optionValue) {
 				if (file.cachedLocation != null) {
-						if (!file.cachedLocation!!.nioPath.toFile().exists()) {
+					if (!Paths.get(opts.packFolder, file.cachedLocation).toFile().exists()) {
 						invalid = true
 					}
 				} else {
@@ -151,22 +174,18 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 				}
 			}
 			if (invalid) {
-					Log.info("File ${fileUri.filename} invalidated, marked for redownloading")
+				Log.info("File $fileUri invalidated, marked for redownloading")
 				invalidatedUris.add(fileUri)
 			}
 		}
 
-			if (manifest.packFileHash?.let { it == packFileSource.hash } == true && invalidatedUris.isEmpty()) {
+		if (manifest.packFileHash?.let { packFileSource.hashIsEqual(it) } == true && invalidatedUris.isEmpty()) {
+			Log.info("Modpack is already up to date!")
 			// todo: --force?
-				ui.submitProgress(InstallProgress("Modpack is already up to date!", 1, 1))
-				if (manifest.cachedFiles.any { it.value.isOptional }) {
-					ui.awaitOptionalButton(false, opts.timeout)
-				}
 			if (!ui.optionsButtonPressed) {
 				return
 			}
 		}
-		}
 
 		Log.info("Modpack name: ${pf.name}")
 
@@ -175,21 +194,26 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			handleCancellation()
 		}
 		try {
+			ifletOrWarn(pf.index, "No index file found") { index ->
+				ui.ifletOrErr(index.hashFormat, index.hash, "Pack has no hash or hashFormat for index") { hashFormat, hash ->
+					ui.ifletOrErr(getNewLoc(opts.downloadURI, index.file), "Pack has invalid index file: " + index.file) { newLoc ->
 						processIndex(
-				pf.index.file,
-				pf.index.hashFormat.fromString(pf.index.hash),
-				pf.index.hashFormat,
+							newLoc,
+							getHash(hashFormat, hash),
+							hashFormat,
 							manifest,
-				invalidatedUris,
-				invalidateAll,
-				clientHolder
+							invalidatedUris
 						)
+					}
+				}
+			}
 		} catch (e1: Exception) {
 			ui.showErrorAndExit("Failed to process index file", e1)
 		}
 
 		handleCancellation()
 
+		// TODO: update MMC params, java args etc
 
 		// If there were errors, don't write the manifest/index hashes, to ensure they are rechecked later
 		if (errorsOccurred) {
@@ -201,43 +225,38 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 
 		manifest.cachedSide = opts.side
 		try {
-			Files.newBufferedWriter(opts.manifestFile.nioPath, StandardCharsets.UTF_8).use { writer -> gson.toJson(manifest, writer) }
+			FileWriter(Paths.get(opts.packFolder, opts.manifestFile).toString()).use { writer -> gson.toJson(manifest, writer) }
 		} catch (e: IOException) {
 			ui.showErrorAndExit("Failed to save local manifest file", e)
 		}
 	}
 
-	private fun processIndex(indexUri: PackwizPath<*>, indexHash: Hash<*>, hashFormat: HashFormat<*>, manifest: ManifestFile, invalidatedFiles: List<PackwizFilePath>, invalidateAll: Boolean, clientHolder: ClientHolder) {
-		if (!invalidateAll) {
-			if (manifest.indexFileHash == indexHash && invalidatedFiles.isEmpty()) {
-				ui.submitProgress(InstallProgress("Modpack files are already up to date!", 1, 1))
-				if (manifest.cachedFiles.any { it.value.isOptional }) {
-					ui.awaitOptionalButton(false, opts.timeout)
+	private fun checkOptions() {
+		// TODO: implement
 	}
+
+	private fun processIndex(indexUri: SpaceSafeURI, indexHash: Hash, hashFormat: String, manifest: ManifestFile, invalidatedUris: List<SpaceSafeURI>) {
+		if (manifest.indexFileHash == indexHash && invalidatedUris.isEmpty()) {
+			Log.info("Modpack files are already up to date!")
 			if (!ui.optionsButtonPressed) {
 				return
 			}
-				if (ui.cancelButtonPressed) {
-					showCancellationDialog()
-					return
-				}
-			}
 		}
 		manifest.indexFileHash = indexHash
 
 		val indexFileSource = try {
-			val src = indexUri.source(clientHolder)
-			hashFormat.source(src)
+			val src = getFileSource(indexUri)
+			getHasher(hashFormat).getHashingSource(src)
 		} catch (e: Exception) {
 			ui.showErrorAndExit("Failed to download index file", e)
 		}
 
 		val indexFile = try {
-			IndexFile.mapper(indexUri).decode<IndexFile>(indexFileSource.buffer().inputStream())
+			Toml().read(indexFileSource.buffer().inputStream()).to(IndexFile::class.java)
 		} catch (e: IllegalStateException) {
 			ui.showErrorAndExit("Failed to parse index file", e)
 		}
-		if (indexHash != indexFileSource.hash) {
+		if (!indexFileSource.hashIsEqual(indexHash)) {
 			ui.showErrorAndExit("Your index file hash is invalid! The pack developer should packwiz refresh on the pack again")
 		}
 
@@ -247,17 +266,31 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		}
 
 		ui.submitProgress(InstallProgress("Checking local files..."))
-		val it: MutableIterator<Map.Entry<PackwizFilePath, ManifestFile.File>> = manifest.cachedFiles.entries.iterator()
+		// TODO: use kotlin filtering/FP rather than an iterator?
+		val it: MutableIterator<Map.Entry<SpaceSafeURI, ManifestFile.File>> = manifest.cachedFiles.entries.iterator()
 		while (it.hasNext()) {
 			val (uri, file) = it.next()
 			if (file.cachedLocation != null) {
-				if (indexFile.files.none { it.file.rebase(opts.packFolder) == uri }) { // File has been removed from the index
+				var alreadyDeleted = false
+				// Delete if option value has been set to false
+				if (file.isOptional && !file.optionValue) {
 					try {
-						Files.deleteIfExists(file.cachedLocation!!.nioPath)
+						Files.deleteIfExists(Paths.get(opts.packFolder, file.cachedLocation))
+					} catch (e: IOException) {
+						Log.warn("Failed to delete optional disabled file", e)
+					}
+					// Set to null, as it doesn't exist anymore
+					file.cachedLocation = null
+					alreadyDeleted = true
+				}
+				if (indexFile.files.none { it.file == uri }) { // File has been removed from the index
+					if (!alreadyDeleted) {
+						try {
+							Files.deleteIfExists(Paths.get(opts.packFolder, file.cachedLocation))
 						} catch (e: IOException) {
 							Log.warn("Failed to delete file removed from index", e)
 						}
-					Log.info("Deleted ${file.cachedLocation!!.filename} (removed from pack)")
+					}
 					it.remove()
 				}
 			}
@@ -273,7 +306,10 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		if (indexFile.files.isEmpty()) {
 			Log.warn("Index is empty!")
 		}
-		val tasks = createTasksFromIndex(indexFile, opts.side)
+		val tasks = createTasksFromIndex(indexFile, indexFile.hashFormat, opts.side)
+		// If the side changes, invalidate EVERYTHING just in case
+		// Might not be needed, but done just to be safe
+		val invalidateAll = opts.side != manifest.cachedSide
 		if (invalidateAll) {
 			Log.info("Side changed, invalidating all mods")
 		}
@@ -281,10 +317,10 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			// TODO: should linkedfile be checked as well? should this be done in the download section?
 			if (invalidateAll) {
 				f.invalidate()
-			} else if (invalidatedFiles.contains(f.metadata.file.rebase(opts.packFolder))) {
+			} else if (invalidatedUris.contains(f.metadata.file)) {
 				f.invalidate()
 			}
-			val file = manifest.cachedFiles[f.metadata.file.rebase(opts.packFolder)]
+			val file = manifest.cachedFiles[f.metadata.file]
 			// Ensure the file can be reverted later if necessary - the DownloadTask modifies the file so if it fails we need the old version back
 			file?.backup()
 			// If it is null, the DownloadTask will make a new empty cachedFile
@@ -297,7 +333,7 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		}
 
 		// Let's hope downloadMetadata is a pure function!!!
-		tasks.parallelStream().forEach { f -> f.downloadMetadata(clientHolder) }
+		tasks.parallelStream().forEach { f -> f.downloadMetadata(indexFile, indexUri) }
 
 		val failedTaskDetails = tasks.asSequence().map(DownloadTask::exceptionDetails).filterNotNull().toList()
 		if (failedTaskDetails.isNotEmpty()) {
@@ -321,22 +357,10 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		}
 
 		// TODO: task failed function?
-		tasks.removeAll { it.failed() }
-		val optionTasks = tasks.filter(DownloadTask::correctSide).filter(DownloadTask::isOptional).toList()
-		val optionsChanged = optionTasks.any(DownloadTask::isNewOptional)
-		if (optionTasks.isNotEmpty() && !optionsChanged) {
-			if (!ui.optionsButtonPressed) {
-				// TODO: this is so ugly
-				ui.submitProgress(InstallProgress("Reconfigure optional mods?", 0,1))
-				ui.awaitOptionalButton(true, opts.timeout)
-				if (ui.cancelButtonPressed) {
-					showCancellationDialog()
-					return
-				}
-			}
-		}
+		val nonFailedFirstTasks = tasks.filter { t -> !t.failed() }.toList()
+		val optionTasks = nonFailedFirstTasks.filter(DownloadTask::correctSide).filter(DownloadTask::isOptional).toList()
 		// If options changed, present all options again
-		if (ui.optionsButtonPressed || optionsChanged) {
+		if (ui.optionsButtonPressed || optionTasks.any(DownloadTask::isNewOptional)) {
 			// new ArrayList is required so it's an IOptionDetails rather than a DownloadTask list
 			if (ui.showOptions(ArrayList(optionTasks))) {
 				cancelled = true
@@ -346,20 +370,12 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		// TODO: keep this enabled? then apply changes after download process?
 		ui.disableOptionsButton(optionTasks.isNotEmpty())
 
-		while (true) {
-			when (validateAndResolve(tasks, clientHolder)) {
-				ResolveResult.RETRY -> {}
-				ResolveResult.QUIT -> return
-				ResolveResult.SUCCESS -> break
-			}
-		}
-
 		// TODO: different thread pool type?
 		val threadPool = Executors.newFixedThreadPool(10)
 		val completionService: CompletionService<DownloadTask> = ExecutorCompletionService(threadPool)
 		tasks.forEach { t ->
 			completionService.submit {
-				t.download(opts.packFolder, clientHolder)
+				t.download(opts.packFolder, indexUri)
 				t
 			}
 		}
@@ -376,10 +392,10 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 				if (task.failed()) {
 					val oldFile = file.revert
 					if (oldFile != null) {
-						manifest.cachedFiles.putIfAbsent(task.metadata.file.rebase(opts.packFolder), oldFile)
+						task.metadata.file?.let { uri -> manifest.cachedFiles.putIfAbsent(uri, oldFile) }
 					} else { null }
 				} else {
-					manifest.cachedFiles.putIfAbsent(task.metadata.file.rebase(opts.packFolder), file)
+					task.metadata.file?.let { uri -> manifest.cachedFiles.putIfAbsent(uri, file) }
 				}
 			}
 
@@ -387,22 +403,11 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			val progress = if (exDetails != null) {
 				"Failed to download ${exDetails.name}: ${exDetails.exception.message}"
 			} else {
-				when (task.completionStatus) {
-					DownloadTask.CompletionStatus.INCOMPLETE -> "${task.name} pending (you should never see this...)"
-					DownloadTask.CompletionStatus.DOWNLOADED -> "Downloaded ${task.name}"
-					DownloadTask.CompletionStatus.ALREADY_EXISTS_CACHED -> "${task.name} already exists (cached)"
-					DownloadTask.CompletionStatus.ALREADY_EXISTS_VALIDATED -> "${task.name} already exists (validated)"
-					DownloadTask.CompletionStatus.SKIPPED_DISABLED -> "Skipped ${task.name} (disabled)"
-					DownloadTask.CompletionStatus.SKIPPED_WRONG_SIDE -> "Skipped ${task.name} (wrong side)"
-					DownloadTask.CompletionStatus.DELETED_DISABLED -> "Deleted ${task.name} (disabled)"
-					DownloadTask.CompletionStatus.DELETED_WRONG_SIDE -> "Deleted ${task.name} (wrong side)"
-				}
+				"Downloaded ${task.name}"
 			}
 			ui.submitProgress(InstallProgress(progress, i + 1, tasks.size))
 
 			if (ui.cancelButtonPressed) { // Stop all tasks, don't launch the game (it's in an invalid state!)
-				// TODO: close client holder in more places?
-				clientHolder.close()
 				threadPool.shutdown()
 				cancelled = true
 				return
@@ -412,7 +417,7 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		// Shut down the thread pool when the update is done
 		threadPool.shutdown()
 
-		val failedTasks2ElectricBoogaloo = tasks.asSequence().map(DownloadTask::exceptionDetails).filterNotNull().toList()
+		val failedTasks2ElectricBoogaloo = nonFailedFirstTasks.asSequence().map(DownloadTask::exceptionDetails).filterNotNull().toList()
 		if (failedTasks2ElectricBoogaloo.isNotEmpty()) {
 			errorsOccurred = true
 			when (ui.showExceptions(failedTasks2ElectricBoogaloo, tasks.size, false)) {
@@ -423,49 +428,6 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 		}
 	}
 
-	enum class ResolveResult {
-		RETRY,
-		QUIT,
-		SUCCESS;
-	}
-
-	private fun validateAndResolve(nonFailedFirstTasks: List<DownloadTask>, clientHolder: ClientHolder): ResolveResult {
-		ui.submitProgress(InstallProgress("Validating existing files..."))
-
-		// Validate existing files
-		for (downloadTask in nonFailedFirstTasks.filter(DownloadTask::correctSide)) {
-			downloadTask.validateExistingFile(opts.packFolder, clientHolder)
-		}
-
-		// Resolve CurseForge metadata
-		val cfFiles = nonFailedFirstTasks.asSequence().filter { !it.alreadyUpToDate }
-			.filter(DownloadTask::correctSide)
-			.map { it.metadata }
-			.filter { it.linkedFile != null }
-			.filter { it.linkedFile!!.download.mode == DownloadMode.CURSEFORGE }.toList()
-		if (cfFiles.isNotEmpty()) {
-			ui.submitProgress(InstallProgress("Resolving CurseForge metadata..."))
-			val resolveFailures = resolveCfMetadata(cfFiles, opts.packFolder, clientHolder)
-			if (resolveFailures.isNotEmpty()) {
-				errorsOccurred = true
-				return when (ui.showExceptions(resolveFailures, cfFiles.size, true)) {
-					ExceptionListResult.CONTINUE -> {
-						ResolveResult.RETRY
-					}
-					ExceptionListResult.CANCEL -> {
-						cancelled = true
-						ResolveResult.QUIT
-					}
-					ExceptionListResult.IGNORE -> {
-						cancelledStartGame = true
-						ResolveResult.QUIT
-					}
-				}
-			}
-		}
-		return ResolveResult.SUCCESS
-	}
-
 	private fun showCancellationDialog() {
 		when (ui.showCancellationDialog()) {
 			CancellationResult.QUIT -> cancelled = true
@@ -483,5 +445,4 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			exitProcess(0)
 		}
 	}
-
 }

src/main/kotlin/link/infra/packwiz/installer/metadata/DownloadMode.kt

@@ -1,19 +0,0 @@
-package link.infra.packwiz.installer.metadata
-
-import cc.ekblad.toml.model.TomlValue
-import cc.ekblad.toml.tomlMapper
-
-enum class DownloadMode {
-	URL,
-	CURSEFORGE;
-
-	companion object {
-		fun mapper() = tomlMapper {
-			decoder { it: TomlValue.String -> when (it.value) {
-				"", "url" -> URL
-				"metadata:curseforge" -> CURSEFORGE
-				else -> throw Exception("Unsupported download mode ${it.value}")
-			} }
-		}
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/metadata/EfficientBooleanAdapter.kt

@@ -17,7 +17,7 @@ class EfficientBooleanAdapter : TypeAdapter<Boolean?>() {
 	}
 
 	@Throws(IOException::class)
-	override fun read(reader: JsonReader): Boolean {
+	override fun read(reader: JsonReader): Boolean? {
 		if (reader.peek() == JsonToken.NULL) {
 			reader.nextNull()
 			return false

src/main/kotlin/link/infra/packwiz/installer/metadata/IndexFile.kt

@@ -1,97 +1,99 @@
 package link.infra.packwiz.installer.metadata
 
-import cc.ekblad.toml.decode
-import cc.ekblad.toml.tomlMapper
+import com.google.gson.annotations.SerializedName
+import com.moandjiezana.toml.Toml
 import link.infra.packwiz.installer.metadata.hash.Hash
-import link.infra.packwiz.installer.metadata.hash.HashFormat
-import link.infra.packwiz.installer.target.ClientHolder
-import link.infra.packwiz.installer.target.path.PackwizPath
-import link.infra.packwiz.installer.util.delegateTransitive
+import link.infra.packwiz.installer.metadata.hash.HashUtils.getHash
+import link.infra.packwiz.installer.metadata.hash.HashUtils.getHasher
+import link.infra.packwiz.installer.request.HandlerManager.getFileSource
+import link.infra.packwiz.installer.request.HandlerManager.getNewLoc
 import okio.Source
 import okio.buffer
+import java.nio.file.Paths
 
-data class IndexFile(
-	val hashFormat: HashFormat<*>,
-	val files: List<File> = listOf()
-) {
-	data class File(
-		val file: PackwizPath<*>,
-		private val hashFormat: HashFormat<*>? = null,
-		val hash: String,
-		val alias: PackwizPath<*>?,
-		val metafile: Boolean = false,
-		val preserve: Boolean = false,
-	) {
+class IndexFile {
+	@SerializedName("hash-format")
+	var hashFormat: String = "sha-256"
+	var files: MutableList<File> = ArrayList()
+
+	class File {
+		var file: SpaceSafeURI? = null
+		@SerializedName("hash-format")
+		var hashFormat: String? = null
+		var hash: String? = null
+		var alias: SpaceSafeURI? = null
+		var metafile = false
+		var preserve = false
+
+		@Transient
 		var linkedFile: ModFile? = null
-
-		fun hashFormat(index: IndexFile) = hashFormat ?: index.hashFormat
-		@Throws(Exception::class)
-		fun getHashObj(index: IndexFile): Hash<*> {
-			// TODO: more specific exceptions?
-			return hashFormat(index).fromString(hash)
-		}
+		@Transient
+		var linkedFileURI: SpaceSafeURI? = null
 
 		@Throws(Exception::class)
-		fun downloadMeta(index: IndexFile, clientHolder: ClientHolder) {
+		fun downloadMeta(parentIndexFile: IndexFile, indexUri: SpaceSafeURI?) {
 			if (!metafile) {
 				return
 			}
-			val fileHash = getHashObj(index)
-			val src = file.source(clientHolder)
-			val fileStream = hashFormat(index).source(src)
-			linkedFile = ModFile.mapper(file).decode<ModFile>(fileStream.buffer().inputStream())
-			if (fileHash != fileStream.hash) {
-				// TODO: propagate details about hash, and show better error!
+			if (hashFormat?.length ?: 0 == 0) {
+				hashFormat = parentIndexFile.hashFormat
+			}
+			// TODO: throw a proper exception instead of allowing NPE?
+			val fileHash = getHash(hashFormat!!, hash!!)
+			linkedFileURI = getNewLoc(indexUri, file)
+			val src = getFileSource(linkedFileURI!!)
+			val fileStream = getHasher(hashFormat!!).getHashingSource(src)
+			linkedFile = Toml().read(fileStream.buffer().inputStream()).to(ModFile::class.java)
+			if (!fileStream.hashIsEqual(fileHash)) {
 				throw Exception("Invalid mod file hash")
 			}
 		}
 
 		@Throws(Exception::class)
-		fun getSource(clientHolder: ClientHolder): Source {
+		fun getSource(indexUri: SpaceSafeURI?): Source {
 			return if (metafile) {
 				if (linkedFile == null) {
 					throw Exception("Linked file doesn't exist!")
 				}
-				linkedFile!!.getSource(clientHolder)
+				linkedFile!!.getSource(linkedFileURI)
 			} else {
-				file.source(clientHolder)
+				val newLoc = getNewLoc(indexUri, file) ?: throw Exception("Index file URI is invalid")
+				getFileSource(newLoc)
 			}
 		}
 
+		@Throws(Exception::class)
+		fun getHashObj(): Hash {
+			if (hash == null) { // TODO: should these be more specific exceptions (e.g. IndexFileException?!)
+				throw Exception("Index file doesn't have a hash")
+			}
+			if (hashFormat == null) {
+				throw Exception("Index file doesn't have a hash format")
+			}
+			return getHash(hashFormat!!, hash!!)
+		}
+
+		// TODO: throw some kind of exception?
 		val name: String
 			get() {
 				if (metafile) {
-					return linkedFile?.name ?: file.filename
+					return linkedFile?.name ?: linkedFile?.filename ?:
+					file?.run { Paths.get(path).fileName.toString() } ?: "Invalid file"
 				}
-				return file.filename
+				return file?.run { Paths.get(path).fileName.toString() } ?: "Invalid file"
 			}
 
-		val destURI: PackwizPath<*>
+		// TODO: URIs are bad
+		val destURI: SpaceSafeURI?
 			get() {
 				if (alias != null) {
 					return alias
 				}
-				return if (metafile) {
-					linkedFile!!.filename
+				return if (metafile && linkedFile != null) {
+					linkedFile?.filename?.let { file?.resolve(it) }
 				} else {
 					file
 				}
 			}
-
-		companion object {
-			fun mapper(base: PackwizPath<*>) = tomlMapper {
-				mapping<File>("hash-format" to "hashFormat")
-				delegateTransitive<HashFormat<*>>(HashFormat.mapper())
-				delegateTransitive<PackwizPath<*>>(PackwizPath.mapperRelativeTo(base))
-			}
-		}
-	}
-
-	companion object {
-		fun mapper(base: PackwizPath<*>) = tomlMapper {
-			mapping<IndexFile>("hash-format" to "hashFormat")
-			delegateTransitive<HashFormat<*>>(HashFormat.mapper())
-			delegateTransitive<File>(File.mapper(base))
-		}
 	}
 }

src/main/kotlin/link/infra/packwiz/installer/metadata/ManifestFile.kt

@@ -1,25 +1,25 @@
 package link.infra.packwiz.installer.metadata
 
 import com.google.gson.annotations.JsonAdapter
+import link.infra.packwiz.installer.UpdateManager
 import link.infra.packwiz.installer.metadata.hash.Hash
-import link.infra.packwiz.installer.target.Side
-import link.infra.packwiz.installer.target.path.PackwizFilePath
 
 class ManifestFile {
-	var packFileHash: Hash<*>? = null
-	var indexFileHash: Hash<*>? = null
-	var cachedFiles: MutableMap<PackwizFilePath, File> = HashMap()
+	var packFileHash: Hash? = null
+	var indexFileHash: Hash? = null
+	var cachedFiles: MutableMap<SpaceSafeURI, File> = HashMap()
 	// If the side changes, EVERYTHING invalidates. FUN!!!
-	var cachedSide = Side.CLIENT
+	var cachedSide = UpdateManager.Options.Side.CLIENT
 
+	// TODO: switch to Kotlin-friendly JSON/TOML libs?
 	class File {
 		@Transient
 		var revert: File? = null
 			private set
 
-		var hash: Hash<*>? = null
-		var linkedFileHash: Hash<*>? = null
-		var cachedLocation: PackwizFilePath? = null
+		var hash: Hash? = null
+		var linkedFileHash: Hash? = null
+		var cachedLocation: String? = null
 
 		@JsonAdapter(EfficientBooleanAdapter::class)
 		var isOptional = false

src/main/kotlin/link/infra/packwiz/installer/metadata/ModFile.kt

@@ -1,96 +1,57 @@
 package link.infra.packwiz.installer.metadata
 
-import cc.ekblad.toml.delegate
-import cc.ekblad.toml.model.TomlValue
-import cc.ekblad.toml.tomlMapper
-import link.infra.packwiz.installer.metadata.curseforge.UpdateData
+import com.google.gson.annotations.SerializedName
+import link.infra.packwiz.installer.UpdateManager
 import link.infra.packwiz.installer.metadata.hash.Hash
-import link.infra.packwiz.installer.metadata.hash.HashFormat
-import link.infra.packwiz.installer.target.ClientHolder
-import link.infra.packwiz.installer.target.Side
-import link.infra.packwiz.installer.target.path.HttpUrlPath
-import link.infra.packwiz.installer.target.path.PackwizPath
-import link.infra.packwiz.installer.util.delegateTransitive
-import okhttp3.HttpUrl.Companion.toHttpUrl
+import link.infra.packwiz.installer.metadata.hash.HashUtils.getHash
+import link.infra.packwiz.installer.request.HandlerManager.getFileSource
+import link.infra.packwiz.installer.request.HandlerManager.getNewLoc
 import okio.Source
-import kotlin.reflect.KType
 
-data class ModFile(
-	val name: String,
-	val filename: PackwizPath<*>,
-	val side: Side = Side.BOTH,
-	val download: Download,
-	val update: Map<String, UpdateData> = mapOf(),
-	val option: Option = Option(false)
-) {
-	data class Download(
-		val url: PackwizPath<*>?,
-		val hashFormat: HashFormat<*>,
-		val hash: String,
-		val mode: DownloadMode = DownloadMode.URL
-	) {
-		companion object {
-			fun mapper() = tomlMapper {
-				decoder<TomlValue.String, PackwizPath<*>> { it -> HttpUrlPath(it.value.toHttpUrl()) }
-				mapping<Download>("hash-format" to "hashFormat")
+class ModFile {
+	var name: String? = null
+	var filename: String? = null
+	var side: UpdateManager.Options.Side? = null
+	var download: Download? = null
 
-				delegateTransitive<HashFormat<*>>(HashFormat.mapper())
-				delegate<DownloadMode>(DownloadMode.mapper())
-			}
-		}
+	class Download {
+		var url: SpaceSafeURI? = null
+		@SerializedName("hash-format")
+		var hashFormat: String? = null
+		var hash: String? = null
 	}
 
-	@Transient
-	val resolvedUpdateData = mutableMapOf<String, PackwizPath<*>>()
+	var update: Map<String, Any>? = null
+	var option: Option? = null
 
-	data class Option(
-		val optional: Boolean,
-		val description: String = "",
-		val defaultValue: Boolean = false
-	) {
-		companion object {
-			fun mapper() = tomlMapper {
-				mapping<Option>("default" to "defaultValue")
-			}
-		}
+	class Option {
+		var optional = false
+		var description: String? = null
+		@SerializedName("default")
+		var defaultValue = false
 	}
 
 	@Throws(Exception::class)
-	fun getSource(clientHolder: ClientHolder): Source {
-		return when (download.mode) {
-			DownloadMode.URL -> {
-				(download.url ?: throw Exception("No download URL provided")).source(clientHolder)
-			}
-			DownloadMode.CURSEFORGE -> {
-				if (!resolvedUpdateData.contains("curseforge")) {
-					throw Exception("Metadata file specifies CurseForge mode, but is missing metadata")
-				}
-				return resolvedUpdateData["curseforge"]!!.source(clientHolder)
-			}
+	fun getSource(baseLoc: SpaceSafeURI?): Source {
+		download?.let {
+			if (it.url == null) {
+				throw Exception("Metadata file doesn't have a download URI")
 			}
+			val newLoc = getNewLoc(baseLoc, it.url) ?: throw Exception("Metadata file URI is invalid")
+			return getFileSource(newLoc)
+		} ?: throw Exception("Metadata file doesn't have download")
 	}
 
 	@get:Throws(Exception::class)
-	val hash: Hash<*>
-		get() = download.hashFormat.fromString(download.hash)
+	val hash: Hash
+		get() {
+			download?.let {
+				return getHash(
+						it.hashFormat ?: throw Exception("Metadata file doesn't have a hash format"),
+						it.hash ?: throw Exception("Metadata file doesn't have a hash")
+				)
+			} ?: throw Exception("Metadata file doesn't have download")
+		}
 
-	companion object {
-		fun mapper(base: PackwizPath<*>) = tomlMapper {
-			delegateTransitive<PackwizPath<*>>(PackwizPath.mapperRelativeTo(base))
-
-			delegateTransitive<Option>(Option.mapper())
-			delegateTransitive<Download>(Download.mapper())
-
-			delegateTransitive<Side>(Side.mapper())
-
-			val updateDataMapper = UpdateData.mapper()
-			decoder { type: KType, it: TomlValue.Map ->
-				if (type.arguments[1].type?.classifier == UpdateData::class) {
-					updateDataMapper.decode<Map<String, UpdateData>>(it)
-				} else {
-					pass()
-				}
-			}
-		}
-	}
+	val isOptional: Boolean get() = option?.optional ?: false
 }

src/main/kotlin/link/infra/packwiz/installer/metadata/PackFile.kt

@@ -1,37 +1,19 @@
 package link.infra.packwiz.installer.metadata
 
-import cc.ekblad.toml.model.TomlValue
-import cc.ekblad.toml.tomlMapper
-import link.infra.packwiz.installer.metadata.hash.HashFormat
-import link.infra.packwiz.installer.target.path.PackwizPath
-import link.infra.packwiz.installer.util.delegateTransitive
+import com.google.gson.annotations.SerializedName
 
-data class PackFile(
-	val name: String,
-	val packFormat: PackFormat = PackFormat.DEFAULT,
-	val index: IndexFileLoc,
-	val versions: Map<String, String> = mapOf()
-) {
-	data class IndexFileLoc(
-		val file: PackwizPath<*>,
-		val hashFormat: HashFormat<*>,
-		val hash: String,
-	) {
-		companion object {
-			fun mapper(base: PackwizPath<*>) = tomlMapper {
-				mapping<IndexFileLoc>("hash-format" to "hashFormat")
-				delegateTransitive<PackwizPath<*>>(PackwizPath.mapperRelativeTo(base))
-				delegateTransitive<HashFormat<*>>(HashFormat.mapper())
-			}
-		}
+class PackFile {
+	var name: String? = null
+	var index: IndexFileLoc? = null
+
+	class IndexFileLoc {
+		var file: SpaceSafeURI? = null
+		@SerializedName("hash-format")
+		var hashFormat: String? = null
+		var hash: String? = null
 	}
 
-	companion object {
-		fun mapper(base: PackwizPath<*>) = tomlMapper {
-			mapping<PackFile>("pack-format" to "packFormat")
-			decoder { it: TomlValue.String -> PackFormat(it.value) }
-			encoder { it: PackFormat -> TomlValue.String(it.format) }
-			delegateTransitive<IndexFileLoc>(IndexFileLoc.mapper(base))
-		}
-	}
+	var versions: Map<String, String>? = null
+	var client: Map<String, Any>? = null
+	var server: Map<String, Any>? = null
 }

src/main/kotlin/link/infra/packwiz/installer/metadata/PackFormat.kt

@@ -1,10 +0,0 @@
-package link.infra.packwiz.installer.metadata
-
-@JvmInline
-value class PackFormat(val format: String) {
-	companion object {
-		val DEFAULT = PackFormat("packwiz:1.0.0")
-	}
-
-	// TODO: implement validation, errors for too new / invalid versions
-}

src/main/kotlin/link/infra/packwiz/installer/metadata/SpaceSafeURI.kt

@@ -0,0 +1,61 @@
+package link.infra.packwiz.installer.metadata
+
+import com.google.gson.annotations.JsonAdapter
+import java.io.Serializable
+import java.net.MalformedURLException
+import java.net.URI
+import java.net.URISyntaxException
+import java.net.URL
+
+// The world's worst URI wrapper
+@JsonAdapter(SpaceSafeURIParser::class)
+class SpaceSafeURI : Comparable<SpaceSafeURI>, Serializable {
+	private val u: URI
+
+	@Throws(URISyntaxException::class)
+	constructor(str: String) {
+		u = URI(str.replace(" ", "%20"))
+	}
+
+	constructor(uri: URI) {
+		u = uri
+	}
+
+	@Throws(URISyntaxException::class)
+	constructor(scheme: String?, authority: String?, path: String?, query: String?, fragment: String?) { // TODO: do all components need to be replaced?
+		u = URI(
+				scheme?.replace(" ", "%20"),
+				authority?.replace(" ", "%20"),
+				path?.replace(" ", "%20"),
+				query?.replace(" ", "%20"),
+				fragment?.replace(" ", "%20")
+		)
+	}
+
+	val path: String get() = u.path.replace("%20", " ")
+
+	override fun toString(): String = u.toString().replace("%20", " ")
+
+	fun resolve(path: String): SpaceSafeURI = SpaceSafeURI(u.resolve(path.replace(" ", "%20")))
+
+	fun resolve(loc: SpaceSafeURI): SpaceSafeURI = SpaceSafeURI(u.resolve(loc.u))
+
+	fun relativize(loc: SpaceSafeURI): SpaceSafeURI = SpaceSafeURI(u.relativize(loc.u))
+
+	override fun equals(other: Any?): Boolean {
+		return if (other is SpaceSafeURI) {
+			u == other.u
+		} else false
+	}
+
+	override fun hashCode() = u.hashCode()
+
+	override fun compareTo(other: SpaceSafeURI): Int = u.compareTo(other.u)
+
+	val scheme: String get() = u.scheme
+	val authority: String get() = u.authority
+	val host: String get() = u.host
+
+	@Throws(MalformedURLException::class)
+	fun toURL(): URL = u.toURL()
+}

src/main/kotlin/link/infra/packwiz/installer/metadata/SpaceSafeURIParser.kt

@@ -0,0 +1,25 @@
+package link.infra.packwiz.installer.metadata
+
+import com.google.gson.JsonDeserializationContext
+import com.google.gson.JsonDeserializer
+import com.google.gson.JsonElement
+import com.google.gson.JsonParseException
+import java.lang.reflect.Type
+import java.net.URISyntaxException
+
+/**
+ * This class encodes spaces before parsing the URI, so the URI can actually be
+ * parsed.
+ */
+internal class SpaceSafeURIParser : JsonDeserializer<SpaceSafeURI> {
+	@Throws(JsonParseException::class)
+	override fun deserialize(json: JsonElement, typeOfT: Type, context: JsonDeserializationContext): SpaceSafeURI {
+		return try {
+			SpaceSafeURI(json.asString)
+		} catch (e: URISyntaxException) {
+			throw JsonParseException("Failed to parse URI", e)
+		}
+	}
+
+	// TODO: replace this with a better solution?
+}

src/main/kotlin/link/infra/packwiz/installer/metadata/curseforge/CurseForgeSourcer.kt

@@ -1,159 +0,0 @@
-package link.infra.packwiz.installer.metadata.curseforge
-
-import com.google.gson.Gson
-import com.google.gson.JsonIOException
-import com.google.gson.JsonSyntaxException
-import link.infra.packwiz.installer.metadata.IndexFile
-import link.infra.packwiz.installer.target.ClientHolder
-import link.infra.packwiz.installer.target.path.HttpUrlPath
-import link.infra.packwiz.installer.target.path.PackwizFilePath
-import link.infra.packwiz.installer.ui.data.ExceptionDetails
-import okhttp3.HttpUrl.Companion.toHttpUrl
-import okhttp3.MediaType.Companion.toMediaType
-import okhttp3.Request
-import okhttp3.RequestBody.Companion.toRequestBody
-import okhttp3.internal.closeQuietly
-import okio.ByteString.Companion.decodeBase64
-import java.nio.charset.StandardCharsets
-import kotlin.io.path.absolute
-
-private class GetFilesRequest(val fileIds: List<Int>)
-private class GetModsRequest(val modIds: List<Int>)
-
-private class GetFilesResponse {
-	class CfFile {
-		var id = 0
-		var modId = 0
-		var downloadUrl: String? = null
-	}
-	val data = mutableListOf<CfFile>()
-}
-
-private class GetModsResponse {
-	class CfMod {
-		var id = 0
-		var name = ""
-		var links: CfLinks? = null
-	}
-	class CfLinks {
-		var websiteUrl = ""
-	}
-	val data = mutableListOf<CfMod>()
-}
-
-private const val APIServer = "api.curseforge.com"
-// If you fork/derive from packwiz, I request that you obtain your own API key.
-private val APIKey = "JDJhJDEwJHNBWVhqblU1N0EzSmpzcmJYM3JVdk92UWk2NHBLS3BnQ2VpbGc1TUM1UGNKL0RYTmlGWWxh".decodeBase64()!!
-	.string(StandardCharsets.UTF_8)
-
-@Throws(JsonSyntaxException::class, JsonIOException::class)
-fun resolveCfMetadata(mods: List<IndexFile.File>, packFolder: PackwizFilePath, clientHolder: ClientHolder): List<ExceptionDetails> {
-	val failures = mutableListOf<ExceptionDetails>()
-	val fileIdMap = mutableMapOf<Int, List<IndexFile.File>>()
-
-	for (mod in mods) {
-		if (!mod.linkedFile!!.update.contains("curseforge")) {
-			failures.add(ExceptionDetails(mod.linkedFile!!.name, Exception("Failed to resolve CurseForge metadata: no CurseForge update section")))
-			continue
-		}
-		val fileId = (mod.linkedFile!!.update["curseforge"] as CurseForgeUpdateData).fileId
-		fileIdMap[fileId] = (fileIdMap[fileId] ?: listOf()) + mod
-	}
-
-	val reqData = GetFilesRequest(fileIdMap.keys.toList())
-	val req = Request.Builder()
-		.url("https://${APIServer}/v1/mods/files")
-		.header("Accept", "application/json")
-		.header("User-Agent", "packwiz-installer")
-		.header("X-API-Key", APIKey)
-		.post(Gson().toJson(reqData, GetFilesRequest::class.java).toRequestBody("application/json".toMediaType()))
-		.build()
-	val res = clientHolder.okHttpClient.newCall(req).execute()
-	if (!res.isSuccessful || res.body == null) {
-		res.closeQuietly()
-		failures.add(ExceptionDetails("Other", Exception("Failed to resolve CurseForge metadata for file data: error code ${res.code}")))
-		return failures
-	}
-
-	val resData = Gson().fromJson(res.body!!.charStream(), GetFilesResponse::class.java)
-	res.closeQuietly()
-
-	val manualDownloadMods = mutableMapOf<Int, List<Int>>()
-	for (file in resData.data) {
-		if (!fileIdMap.contains(file.id)) {
-			failures.add(ExceptionDetails(file.id.toString(),
-				Exception("Failed to find file from result: ID ${file.id}, Project ID ${file.modId}")))
-			continue
-		}
-		if (file.downloadUrl == null) {
-			manualDownloadMods[file.modId] = (manualDownloadMods[file.modId] ?: listOf()) + file.id
-			continue
-		}
-		try {
-			for (indexFile in fileIdMap[file.id]!!) {
-				indexFile.linkedFile!!.resolvedUpdateData["curseforge"] =
-					HttpUrlPath(file.downloadUrl!!.toHttpUrl())
-			}
-		} catch (e: IllegalArgumentException) {
-			failures.add(ExceptionDetails(file.id.toString(),
-				Exception("Failed to parse URL: ${file.downloadUrl} for ID ${file.id}, Project ID ${file.modId}", e)))
-		}
-	}
-
-	// Some file types don't show up in the API at all! (e.g. shaderpacks)
-	// Add unresolved files to manualDownloadMods
-	for ((fileId, indexFiles) in fileIdMap) {
-		for (file in indexFiles) {
-			if (file.linkedFile != null) {
-				if (file.linkedFile!!.resolvedUpdateData["curseforge"] == null) {
-					val projectId = (file.linkedFile!!.update["curseforge"] as CurseForgeUpdateData).projectId
-					manualDownloadMods[projectId] = (manualDownloadMods[projectId] ?: listOf()) + fileId
-				}
-			}
-		}
-	}
-
-	if (manualDownloadMods.isNotEmpty()) {
-		val reqModsData = GetModsRequest(manualDownloadMods.keys.toList())
-		val reqMods = Request.Builder()
-			.url("https://${APIServer}/v1/mods")
-			.header("Accept", "application/json")
-			.header("User-Agent", "packwiz-installer")
-			.header("X-API-Key", APIKey)
-			.post(Gson().toJson(reqModsData, GetModsRequest::class.java).toRequestBody("application/json".toMediaType()))
-			.build()
-		val resMods = clientHolder.okHttpClient.newCall(reqMods).execute()
-		if (!resMods.isSuccessful || resMods.body == null) {
-			resMods.closeQuietly()
-			failures.add(ExceptionDetails("Other", Exception("Failed to resolve CurseForge metadata for mod data: error code ${resMods.code}")))
-			return failures
-		}
-
-		val resModsData = Gson().fromJson(resMods.body!!.charStream(), GetModsResponse::class.java)
-		resMods.closeQuietly()
-
-		for (mod in resModsData.data) {
-			if (!manualDownloadMods.contains(mod.id)) {
-				failures.add(ExceptionDetails(mod.name,
-					Exception("Failed to find project from result: ID ${mod.id}")))
-				continue
-			}
-
-			for (fileId in manualDownloadMods[mod.id]!!) {
-				if (!fileIdMap.contains(fileId)) {
-					failures.add(ExceptionDetails(mod.name,
-						Exception("Failed to find file from result: file ID $fileId")))
-					continue
-				}
-
-				for (indexFile in fileIdMap[fileId]!!) {
-					var modUrl = "${mod.links?.websiteUrl}/files/${fileId}"
-					failures.add(ExceptionDetails(indexFile.name, Exception("This mod is excluded from the CurseForge API and must be downloaded manually.\n" +
-						"Please go to ${modUrl} and save this file to ${indexFile.destURI.rebase(packFolder).nioPath.absolute()}"), modUrl))
-				}
-			}
-		}
-	}
-
-	return failures
-}

src/main/kotlin/link/infra/packwiz/installer/metadata/curseforge/CurseForgeUpdateData.kt

@@ -1,14 +0,0 @@
-package link.infra.packwiz.installer.metadata.curseforge
-
-import cc.ekblad.toml.tomlMapper
-
-data class CurseForgeUpdateData(
-	val fileId: Int,
-	val projectId: Int,
-): UpdateData {
-	companion object {
-		fun mapper() = tomlMapper {
-			mapping<CurseForgeUpdateData>("file-id" to "fileId", "project-id" to "projectId")
-		}
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/metadata/curseforge/UpdateData.kt

@@ -1,17 +0,0 @@
-package link.infra.packwiz.installer.metadata.curseforge
-
-import cc.ekblad.toml.model.TomlValue
-import cc.ekblad.toml.tomlMapper
-
-interface UpdateData {
-	companion object {
-		fun mapper() = tomlMapper {
-			val cfMapper = CurseForgeUpdateData.mapper()
-			decoder { it: TomlValue.Map ->
-				if (it.properties.contains("curseforge")) {
-					mapOf("curseforge" to cfMapper.decode<CurseForgeUpdateData>(it.properties["curseforge"]!!))
-				} else { mapOf() }
-			}
-		}
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/metadata/curseforge/UpdateDeserializer.kt

@@ -1,22 +0,0 @@
-package link.infra.packwiz.installer.metadata.curseforge
-
-import com.google.gson.JsonDeserializationContext
-import com.google.gson.JsonDeserializer
-import com.google.gson.JsonElement
-import java.lang.reflect.Type
-
-class UpdateDeserializer: JsonDeserializer<Map<String, UpdateData>> {
-	override fun deserialize(
-		json: JsonElement?,
-		typeOfT: Type?,
-		context: JsonDeserializationContext?
-	): Map<String, UpdateData> {
-		val out = mutableMapOf<String, UpdateData>()
-		for ((k, v) in json!!.asJsonObject.entrySet()) {
-			if (k == "curseforge") {
-				out[k] = context!!.deserialize(v, CurseForgeUpdateData::class.java)
-			}
-		}
-		return out
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/GeneralHashingSource.kt

@@ -0,0 +1,10 @@
+package link.infra.packwiz.installer.metadata.hash
+
+import okio.ForwardingSource
+import okio.Source
+
+abstract class GeneralHashingSource(delegate: Source) : ForwardingSource(delegate) {
+	abstract val hash: Hash
+
+	fun hashIsEqual(compareTo: Any) = compareTo == hash
+}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/Hash.kt

@@ -1,62 +1,20 @@
 package link.infra.packwiz.installer.metadata.hash
 
 import com.google.gson.*
-import link.infra.packwiz.installer.metadata.hash.Hash.SourceProvider
-import okio.ByteString
-import okio.ByteString.Companion.decodeHex
-import okio.ForwardingSource
-import okio.HashingSource
-import okio.Source
 import java.lang.reflect.Type
 
-data class Hash<T>(val type: HashFormat<T>, val value: T) {
-	interface Encoding<T> {
-		fun encodeToString(value: T): String
-		fun decodeFromString(str: String): T
+abstract class Hash {
+	protected abstract val stringValue: String
+	protected abstract val type: String
 
-		object Hex: Encoding<ByteString> {
-			override fun encodeToString(value: ByteString) = value.hex()
-			override fun decodeFromString(str: String) = str.decodeHex()
-		}
-
-		object UInt: Encoding<kotlin.UInt> {
-			override fun encodeToString(value: kotlin.UInt) = value.toString()
-			override fun decodeFromString(str: String) =
-				try {
-					str.toUInt()
-				} catch (e: NumberFormatException) {
-					// Old packwiz.json values are signed; if they are negative they should be parsed as signed integers
-					// and reinterpreted as unsigned integers
-					str.toInt().toUInt()
-				}
-		}
-	}
-
-	fun interface SourceProvider<T> {
-		fun source(type: HashFormat<T>, delegate: Source): HasherSource<T>
-
-		companion object {
-			fun fromOkio(provider: ((Source) -> HashingSource)): SourceProvider<ByteString> {
-				return SourceProvider { type, delegate ->
-					val delegateHashing = provider.invoke(delegate)
-					object : ForwardingSource(delegateHashing), HasherSource<ByteString> {
-						override val hash: Hash<ByteString> by lazy(LazyThreadSafetyMode.NONE) { Hash(type, delegateHashing.hash) }
-					}
-				}
-			}
-		}
-	}
-
-	class TypeHandler : JsonDeserializer<Hash<*>>, JsonSerializer<Hash<*>> {
-		override fun serialize(src: Hash<*>, typeOfSrc: Type, context: JsonSerializationContext): JsonElement = JsonObject().apply {
-			add("type", JsonPrimitive(src.type.formatName))
-			// Local function for generics
-			fun <T> addValue(src: Hash<T>) = add("value", JsonPrimitive(src.type.encodeToString(src.value)))
-			addValue(src)
+	class TypeHandler : JsonDeserializer<Hash>, JsonSerializer<Hash> {
+		override fun serialize(src: Hash, typeOfSrc: Type, context: JsonSerializationContext): JsonElement = JsonObject().apply {
+			add("type", JsonPrimitive(src.type))
+			add("value", JsonPrimitive(src.stringValue))
 		}
 
 		@Throws(JsonParseException::class)
-		override fun deserialize(json: JsonElement, typeOfT: Type, context: JsonDeserializationContext): Hash<*> {
+		override fun deserialize(json: JsonElement, typeOfT: Type, context: JsonDeserializationContext): Hash {
 			val obj = json.asJsonObject
 			val type: String
 			val value: String
@@ -67,7 +25,7 @@ data class Hash<T>(val type: HashFormat<T>, val value: T) {
 				throw JsonParseException("Invalid hash JSON data")
 			}
 			return try {
-				(HashFormat.fromName(type) ?: throw JsonParseException("Unknown hash type $type")).fromString(value)
+				HashUtils.getHash(type, value)
 			} catch (e: Exception) {
 				throw JsonParseException("Failed to create hash object", e)
 			}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/HashFormat.kt

@@ -1,39 +0,0 @@
-package link.infra.packwiz.installer.metadata.hash
-
-import cc.ekblad.toml.model.TomlValue
-import cc.ekblad.toml.tomlMapper
-import link.infra.packwiz.installer.metadata.hash.Hash.Encoding
-import link.infra.packwiz.installer.metadata.hash.Hash.SourceProvider
-import link.infra.packwiz.installer.metadata.hash.Hash.SourceProvider.Companion.fromOkio
-import okio.ByteString
-import okio.Source
-import okio.HashingSource.Companion as OkHashes
-
-sealed class HashFormat<T>(val formatName: String): Encoding<T>, SourceProvider<T> {
-	object SHA1: HashFormat<ByteString>("sha1"),
-		Encoding<ByteString> by Encoding.Hex, SourceProvider<ByteString> by fromOkio(OkHashes::sha1)
-	object SHA256: HashFormat<ByteString>("sha256"),
-		Encoding<ByteString> by Encoding.Hex, SourceProvider<ByteString> by fromOkio(OkHashes::sha256)
-	object SHA512: HashFormat<ByteString>("sha512"),
-		Encoding<ByteString> by Encoding.Hex, SourceProvider<ByteString> by fromOkio(OkHashes::sha512)
-	object MD5: HashFormat<ByteString>("md5"),
-		Encoding<ByteString> by Encoding.Hex, SourceProvider<ByteString> by fromOkio(OkHashes::md5)
-	object MURMUR2: HashFormat<UInt>("murmur2"),
-		Encoding<UInt> by Encoding.UInt, SourceProvider<UInt> by SourceProvider(::Murmur2HasherSource)
-
-	fun source(delegate: Source): HasherSource<T> = source(this, delegate)
-	fun fromString(str: String) = Hash(this, decodeFromString(str))
-	override fun toString() = formatName
-
-	companion object {
-		// lazy used to prevent initialisation issues!
-		private val values by lazy { listOf(SHA1, SHA256, SHA512, MD5, MURMUR2) }
-		fun fromName(formatName: String) = values.find { formatName == it.formatName }
-
-		fun mapper() = tomlMapper {
-			// TODO: better exception?
-			decoder { it: TomlValue.String -> fromName(it.value) ?: throw Exception("Hash format ${it.value} not supported") }
-			encoder { it: HashFormat<*> -> TomlValue.String(it.formatName) }
-		}
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/HashUtils.kt

@@ -0,0 +1,22 @@
+package link.infra.packwiz.installer.metadata.hash
+
+object HashUtils {
+	private val hashTypeConversion: Map<String, IHasher> = mapOf(
+			"sha256" to HashingSourceHasher("sha256"),
+			"sha512" to HashingSourceHasher("sha512"),
+			"murmur2" to Murmur2Hasher(),
+			"sha1" to HashingSourceHasher("sha1")
+	)
+
+	@JvmStatic
+	@Throws(Exception::class)
+	fun getHasher(type: String): IHasher {
+		return hashTypeConversion[type] ?: throw Exception("Hash type not supported: $type")
+	}
+
+	@JvmStatic
+	@Throws(Exception::class)
+	fun getHash(type: String, value: String): Hash {
+		return hashTypeConversion[type]?.getHash(value) ?: throw Exception("Hash type not supported: $type")
+	}
+}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/HasherSource.kt

@@ -1,7 +0,0 @@
-package link.infra.packwiz.installer.metadata.hash
-
-import okio.Source
-
-interface HasherSource<T>: Source {
-	val hash: Hash<T>
-}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/HashingSourceHasher.kt

@@ -0,0 +1,46 @@
+package link.infra.packwiz.installer.metadata.hash
+
+import okio.HashingSource
+import okio.Source
+
+class HashingSourceHasher internal constructor(private val type: String) : IHasher {
+	// i love naming things
+	private inner class HashingSourceGeneralHashingSource(val delegateHashing: HashingSource) : GeneralHashingSource(delegateHashing) {
+		override val hash: Hash by lazy(LazyThreadSafetyMode.NONE) {
+			HashingSourceHash(delegateHashing.hash.hex())
+		}
+	}
+
+	// this some funky inner class stuff
+	// each of these classes is specific to the instance of the HasherHashingSource
+	// therefore HashingSourceHashes from different parent instances will be not instanceof each other
+	private inner class HashingSourceHash(val value: String) : Hash() {
+		override val stringValue get() = value
+
+		override fun equals(other: Any?): Boolean {
+			if (other !is HashingSourceHash) {
+				return false
+			}
+			return stringValue.equals(other.stringValue, ignoreCase = true)
+		}
+
+		override fun toString(): String = "$type: $stringValue"
+		override fun hashCode(): Int = value.hashCode()
+
+		override val type: String get() = this@HashingSourceHasher.type
+	}
+
+	override fun getHashingSource(delegate: Source): GeneralHashingSource {
+		when (type) {
+			"md5" -> return HashingSourceGeneralHashingSource(HashingSource.md5(delegate))
+			"sha256" -> return HashingSourceGeneralHashingSource(HashingSource.sha256(delegate))
+			"sha512" -> return HashingSourceGeneralHashingSource(HashingSource.sha512(delegate))
+			"sha1" -> return HashingSourceGeneralHashingSource(HashingSource.sha1(delegate))
+		}
+		throw RuntimeException("Invalid hash type provided")
+	}
+
+	override fun getHash(value: String): Hash {
+		return HashingSourceHash(value)
+	}
+}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/IHasher.kt

@@ -0,0 +1,8 @@
+package link.infra.packwiz.installer.metadata.hash
+
+import okio.Source
+
+interface IHasher {
+	fun getHashingSource(delegate: Source): GeneralHashingSource
+	fun getHash(value: String): Hash
+}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/Murmur2Hasher.kt

@@ -0,0 +1,91 @@
+package link.infra.packwiz.installer.metadata.hash
+
+import okio.Buffer
+import okio.Source
+import java.io.IOException
+
+class Murmur2Hasher : IHasher {
+	private inner class Murmur2GeneralHashingSource(delegate: Source) : GeneralHashingSource(delegate) {
+		val internalBuffer = Buffer()
+		val tempBuffer = Buffer()
+
+		override val hash: Hash by lazy(LazyThreadSafetyMode.NONE) {
+			val data = internalBuffer.readByteArray()
+			Murmur2Hash(Murmur2Lib.hash32(data, data.size, 1))
+		}
+
+		@Throws(IOException::class)
+		override fun read(sink: Buffer, byteCount: Long): Long {
+			val out = delegate.read(tempBuffer, byteCount)
+			if (out > -1) {
+				sink.write(tempBuffer.clone(), out)
+				computeNormalizedBufferFaster(tempBuffer, internalBuffer)
+			}
+			return out
+		}
+
+		// Credit to https://github.com/modmuss50/CAV2/blob/master/murmur.go
+//		private fun computeNormalizedArray(input: ByteArray): ByteArray {
+//			val output = ByteArray(input.size)
+//			var index = 0
+//			for (b in input) {
+//				when (b) {
+//					9.toByte(), 10.toByte(), 13.toByte(), 32.toByte() -> {}
+//					else -> {
+//						output[index] = b
+//						index++
+//					}
+//				}
+//			}
+//			val outputTrimmed = ByteArray(index)
+//			System.arraycopy(output, 0, outputTrimmed, 0, index)
+//			return outputTrimmed
+//		}
+
+		private fun computeNormalizedBufferFaster(input: Buffer, output: Buffer) {
+			var index = 0
+			val arr = input.readByteArray()
+			for (b in arr) {
+				when (b) {
+					9.toByte(), 10.toByte(), 13.toByte(), 32.toByte() -> {}
+					else -> {
+						arr[index] = b
+						index++
+					}
+				}
+			}
+			output.write(arr, 0, index)
+		}
+
+	}
+
+	private class Murmur2Hash : Hash {
+		val value: Int
+
+		constructor(value: String) {
+			// Parsing as long then casting to int converts values gt int max value but lt uint max value
+			// into negatives. I presume this is how the murmur2 code handles this.
+			this.value = value.toLong().toInt()
+		}
+
+		constructor(value: Int) {
+			this.value = value
+		}
+
+		override val stringValue get() = value.toString()
+		override val type get() = "murmur2"
+
+		override fun equals(other: Any?): Boolean {
+			if (other !is Murmur2Hash) {
+				return false
+			}
+			return value == other.value
+		}
+
+		override fun toString(): String = "murmur2: $value"
+		override fun hashCode(): Int = value
+	}
+
+	override fun getHashingSource(delegate: Source): GeneralHashingSource = Murmur2GeneralHashingSource(delegate)
+	override fun getHash(value: String): Hash = Murmur2Hash(value)
+}

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/Murmur2HasherSource.kt

@@ -1,43 +0,0 @@
-package link.infra.packwiz.installer.metadata.hash
-
-import okio.Buffer
-import okio.ForwardingSource
-import okio.Source
-import java.io.IOException
-
-class Murmur2HasherSource(type: HashFormat<UInt>, delegate: Source) : ForwardingSource(delegate), HasherSource<UInt> {
-	private val internalBuffer = Buffer()
-	private val tempBuffer = Buffer()
-
-	override val hash: Hash<UInt> by lazy(LazyThreadSafetyMode.NONE) {
-		// TODO: remove internal buffering?
-		val data = internalBuffer.readByteArray()
-		Hash(type, Murmur2Lib.hash32(data, data.size, 1).toUInt())
-	}
-
-	@Throws(IOException::class)
-	override fun read(sink: Buffer, byteCount: Long): Long {
-		val out = delegate.read(tempBuffer, byteCount)
-		if (out > -1) {
-			sink.write(tempBuffer.clone(), out)
-			computeNormalizedBufferFaster(tempBuffer, internalBuffer)
-		}
-		return out
-	}
-
-	// Credit to https://github.com/modmuss50/CAV2/blob/master/murmur.go
-	private fun computeNormalizedBufferFaster(input: Buffer, output: Buffer) {
-		var index = 0
-		val arr = input.readByteArray()
-		for (b in arr) {
-			when (b) {
-				9.toByte(), 10.toByte(), 13.toByte(), 32.toByte() -> {}
-				else -> {
-					arr[index] = b
-					index++
-				}
-			}
-		}
-		output.write(arr, 0, index)
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/request/HandlerManager.kt

@@ -0,0 +1,52 @@
+package link.infra.packwiz.installer.request
+
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import link.infra.packwiz.installer.request.handlers.RequestHandlerFile
+import link.infra.packwiz.installer.request.handlers.RequestHandlerGithub
+import link.infra.packwiz.installer.request.handlers.RequestHandlerHTTP
+import okio.Source
+
+object HandlerManager {
+
+	private val handlers: List<IRequestHandler> = listOf(
+			RequestHandlerGithub(),
+			RequestHandlerHTTP(),
+			RequestHandlerFile()
+	)
+
+	 // TODO: get rid of nullable stuff here
+	@JvmStatic
+	fun getNewLoc(base: SpaceSafeURI?, loc: SpaceSafeURI?): SpaceSafeURI? {
+		if (loc == null) {
+			return null
+		}
+		val dest = base?.run { resolve(loc) } ?: loc
+		for (handler in handlers) with (handler) {
+			if (matchesHandler(dest)) {
+				return getNewLoc(dest)
+			}
+		}
+		return dest
+	}
+
+	// TODO: What if files are read multiple times??
+	// Zip handler discards once read, requesting multiple times on other handlers would cause multiple downloads
+	// Caching system? Copy from already downloaded files?
+
+	// TODO: change to use something more idiomatic than exceptions?
+
+	@JvmStatic
+	@Throws(Exception::class)
+	fun getFileSource(loc: SpaceSafeURI): Source {
+		for (handler in handlers) {
+			if (handler.matchesHandler(loc)) {
+				return handler.getFileSource(loc) ?: throw Exception("Couldn't find URI: $loc")
+			}
+		}
+		throw Exception("No handler available for URI: $loc")
+	}
+
+	// TODO: github toml resolution?
+	// e.g. https://github.com/comp500/Demagnetize -> demagnetize.toml
+	// https://github.com/comp500/Demagnetize/blob/master/demagnetize.toml
+}

src/main/kotlin/link/infra/packwiz/installer/request/IRequestHandler.kt

@@ -0,0 +1,24 @@
+package link.infra.packwiz.installer.request
+
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import okio.Source
+
+/**
+ * IRequestHandler handles requests for locations specified in modpack metadata.
+ */
+interface IRequestHandler {
+	fun matchesHandler(loc: SpaceSafeURI): Boolean
+
+	fun getNewLoc(loc: SpaceSafeURI): SpaceSafeURI {
+		return loc
+	}
+
+	/**
+	 * Gets the Source for a location. Must be threadsafe.
+	 * It is assumed that each location is read only once for the duration of an IRequestHandler.
+	 * @param loc The location to be read
+	 * @return The Source containing the data of the file
+	 * @throws Exception Exception if it failed to download a file!!!
+	 */
+	fun getFileSource(loc: SpaceSafeURI): Source?
+}

src/main/kotlin/link/infra/packwiz/installer/request/RequestExceptions.kt

@@ -1,67 +0,0 @@
-package link.infra.packwiz.installer.request
-
-import okio.IOException
-
-sealed class RequestException: Exception {
-	constructor(message: String, cause: Throwable) : super(message, cause)
-	constructor(message: String) : super(message)
-
-	/**
-	 * Internal errors that should not be shown to the user when the code is correct
-	 */
-	sealed class Internal: RequestException {
-		constructor(message: String, cause: Throwable) : super(message, cause)
-		constructor(message: String) : super(message)
-
-		sealed class HTTP: Internal {
-			constructor(message: String, cause: Throwable) : super(message, cause)
-			constructor(message: String) : super(message)
-
-			class NoResponseBody: HTTP("HTTP response in onResponse must have a response body")
-			class RequestFailed(cause: IOException): HTTP("HTTP request failed", cause)
-			class IllegalState(cause: IllegalStateException): HTTP("Internal fatal HTTP request error", cause)
-		}
-	}
-
-	/**
-	 * Errors indicating that the request is malformed
-	 */
-	sealed class Validation: RequestException {
-		constructor(message: String, cause: Throwable) : super(message, cause)
-		constructor(message: String) : super(message)
-
-		// TODO: move out of RequestException?
-		class PathContainsNUL(path: String): Validation("Invalid path; contains NUL bytes: ${path.replace("\u0000", "")}")
-		class PathContainsVolumeLetter(path: String): Validation("Invalid path; contains volume letter: $path")
-	}
-
-	/**
-	 * Errors relating to the response from the server
-	 */
-	sealed class Response: RequestException {
-		constructor(message: String, cause: Throwable) : super(message, cause)
-		constructor(message: String) : super(message)
-
-		// TODO: fancier way of displaying this?
-		sealed class HTTP: Response {
-			val res: okhttp3.Response
-
-			constructor(req: okhttp3.Request, res: okhttp3.Response, message: String, cause: Throwable) : super("Failed to make HTTP request to ${req.url}: $message", cause) {
-				this.res = res
-			}
-			constructor(req: okhttp3.Request, res: okhttp3.Response, message: String) : super("Failed to make HTTP request to ${req.url}: $message") {
-				this.res = res
-			}
-
-			class ErrorCode(req: okhttp3.Request, res: okhttp3.Response): HTTP(req, res, "Non-successful error code from HTTP request: ${res.code}")
-		}
-
-		sealed class File: RequestException {
-			constructor(message: String, cause: Throwable) : super(message, cause)
-			constructor(message: String) : super(message)
-
-			class FileNotFound(file: String): File("File path not found: $file")
-			class Other(cause: Throwable): File("Failed to read file", cause)
-		}
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/request/handlers/RequestHandlerFile.kt

@@ -0,0 +1,18 @@
+package link.infra.packwiz.installer.request.handlers
+
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import link.infra.packwiz.installer.request.IRequestHandler
+import okio.Source
+import okio.source
+import java.nio.file.Paths
+
+open class RequestHandlerFile : IRequestHandler {
+	override fun matchesHandler(loc: SpaceSafeURI): Boolean {
+		return "file" == loc.scheme
+	}
+
+	override fun getFileSource(loc: SpaceSafeURI): Source? {
+		val path = Paths.get(loc.toURL().toURI())
+		return path.source()
+	}
+}

src/main/kotlin/link/infra/packwiz/installer/request/handlers/RequestHandlerGithub.kt

@@ -0,0 +1,71 @@
+package link.infra.packwiz.installer.request.handlers
+
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import java.util.*
+import java.util.concurrent.locks.ReentrantReadWriteLock
+import java.util.regex.Pattern
+import kotlin.concurrent.read
+import kotlin.concurrent.write
+
+class RequestHandlerGithub : RequestHandlerZip(true) {
+	override fun getNewLoc(loc: SpaceSafeURI): SpaceSafeURI {
+		return loc
+	}
+
+	companion object {
+		private val repoMatcherPattern = Pattern.compile("/([\\w.-]+/[\\w.-]+).*")
+		private val branchMatcherPattern = Pattern.compile("/[\\w.-]+/[\\w.-]+/blob/([\\w.-]+).*")
+	}
+
+	// TODO: is caching really needed, if HTTPURLConnection follows redirects correctly?
+	private val zipUriMap: MutableMap<String, SpaceSafeURI> = HashMap()
+	private val zipUriLock = ReentrantReadWriteLock()
+	private fun getRepoName(loc: SpaceSafeURI): String? {
+		val matcher = repoMatcherPattern.matcher(loc.path)
+		return if (matcher.matches()) {
+			matcher.group(1)
+		} else {
+			null
+		}
+	}
+
+	override fun getZipUri(loc: SpaceSafeURI): SpaceSafeURI {
+		val repoName = getRepoName(loc)
+		val branchName = getBranch(loc)
+
+		zipUriLock.read {
+			zipUriMap["$repoName/$branchName"]
+		}?.let { return it }
+
+		var zipUri = SpaceSafeURI("https://api.github.com/repos/$repoName/zipball/$branchName")
+		zipUriLock.write {
+			// If another thread sets the value concurrently, use the existing value from the
+			// thread that first acquired the lock.
+			zipUri = zipUriMap.putIfAbsent("$repoName/$branchName", zipUri) ?: zipUri
+		}
+		return zipUri
+	}
+
+	private fun getBranch(loc: SpaceSafeURI): String? {
+		val matcher = branchMatcherPattern.matcher(loc.path)
+		return if (matcher.matches()) {
+			matcher.group(1)
+		} else {
+			null
+		}
+	}
+
+	override fun getLocationInZip(loc: SpaceSafeURI): SpaceSafeURI {
+		val path = "/" + getRepoName(loc) + "/blob/" + getBranch(loc)
+		return SpaceSafeURI(loc.scheme, loc.authority, path, null, null).relativize(loc)
+	}
+
+	override fun matchesHandler(loc: SpaceSafeURI): Boolean {
+		val scheme = loc.scheme
+		if (!("http" == scheme || "https" == scheme)) {
+			return false
+		}
+		// TODO: more match testing?
+		return "github.com" == loc.host && branchMatcherPattern.matcher(loc.path).matches()
+	}
+}

src/main/kotlin/link/infra/packwiz/installer/request/handlers/RequestHandlerHTTP.kt

@@ -0,0 +1,29 @@
+package link.infra.packwiz.installer.request.handlers
+
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import link.infra.packwiz.installer.request.IRequestHandler
+import okio.Source
+import okio.source
+import java.net.HttpURLConnection
+
+open class RequestHandlerHTTP : IRequestHandler {
+	override fun matchesHandler(loc: SpaceSafeURI): Boolean {
+		val scheme = loc.scheme
+		return "http" == scheme || "https" == scheme
+	}
+
+	override fun getFileSource(loc: SpaceSafeURI): Source? {
+		val conn = loc.toURL().openConnection() as HttpURLConnection
+		// TODO: when do we send specific headers??? should there be a way to signal this?
+		conn.addRequestProperty("Accept", "application/octet-stream")
+		// TODO: include version?
+		conn.addRequestProperty("User-Agent", "packwiz-installer")
+
+		conn.apply {
+			// 30 second read timeout
+			readTimeout = 30 * 1000
+			requestMethod = "GET"
+		}
+		return conn.inputStream.source()
+	}
+}

src/main/kotlin/link/infra/packwiz/installer/request/handlers/RequestHandlerZip.kt

@@ -0,0 +1,123 @@
+package link.infra.packwiz.installer.request.handlers
+
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import okio.Buffer
+import okio.Source
+import okio.buffer
+import okio.source
+import java.util.*
+import java.util.concurrent.locks.ReentrantLock
+import java.util.concurrent.locks.ReentrantReadWriteLock
+import java.util.function.Predicate
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
+import kotlin.concurrent.read
+import kotlin.concurrent.withLock
+import kotlin.concurrent.write
+
+abstract class RequestHandlerZip(private val modeHasFolder: Boolean) : RequestHandlerHTTP() {
+	private fun removeFolder(name: String): String {
+		return if (modeHasFolder) {
+			// TODO: replace with proper path checks once switched to Path??
+			name.substring(name.indexOf("/") + 1)
+		} else {
+			name
+		}
+	}
+
+	private inner class ZipReader(zip: Source) {
+		private val zis = ZipInputStream(zip.buffer().inputStream())
+		private val readFiles: MutableMap<SpaceSafeURI, Buffer> = HashMap()
+		// Write lock implies access to ZipInputStream - only 1 thread must read at a time!
+		val filesLock = ReentrantLock()
+		private var entry: ZipEntry? = null
+
+		private val zipSource = zis.source().buffer()
+
+		// File lock must be obtained before calling this function
+		private fun readCurrFile(): Buffer {
+			val fileBuffer = Buffer()
+			zipSource.readFully(fileBuffer, entry!!.size)
+			return fileBuffer
+		}
+
+		// File lock must be obtained before calling this function
+		private fun findFile(loc: SpaceSafeURI): Buffer? {
+			while (true) {
+				entry = zis.nextEntry
+				entry?.also {
+					val data = readCurrFile()
+					val fileLoc = SpaceSafeURI(removeFolder(it.name))
+					if (loc == fileLoc) {
+						return data
+					} else {
+						readFiles[fileLoc] = data
+					}
+				} ?: return null
+			}
+		}
+
+		fun getFileSource(loc: SpaceSafeURI): Source? {
+			filesLock.withLock {
+				// Assume files are only read once, allow GC by removing
+				readFiles.remove(loc)?.also { return it }
+				return findFile(loc)
+			}
+		}
+
+		fun findInZip(matches: Predicate<SpaceSafeURI>): SpaceSafeURI? {
+			filesLock.withLock {
+				readFiles.keys.find { matches.test(it) }?.let { return it }
+
+				do {
+					val entry = zis.nextEntry?.also {
+						val data = readCurrFile()
+						val fileLoc = SpaceSafeURI(removeFolder(it.name))
+						readFiles[fileLoc] = data
+						if (matches.test(fileLoc)) {
+							return fileLoc
+						}
+					}
+				} while (entry != null)
+				return null
+			}
+		}
+	}
+
+	private val cache: MutableMap<SpaceSafeURI, ZipReader> = HashMap()
+	private val cacheLock = ReentrantReadWriteLock()
+
+	protected abstract fun getZipUri(loc: SpaceSafeURI): SpaceSafeURI
+	protected abstract fun getLocationInZip(loc: SpaceSafeURI): SpaceSafeURI
+	abstract override fun matchesHandler(loc: SpaceSafeURI): Boolean
+
+	override fun getFileSource(loc: SpaceSafeURI): Source? {
+		val zipUri = getZipUri(loc)
+		var zr = cacheLock.read { cache[zipUri] }
+		if (zr == null) {
+			cacheLock.write {
+				// Recheck, because unlocking read lock allows another thread to modify it
+				zr = cache[zipUri]
+
+				if (zr == null) {
+					val src = super.getFileSource(zipUri) ?: return null
+					zr = ZipReader(src).also { cache[zipUri] = it }
+				}
+			}
+		}
+		return zr?.getFileSource(getLocationInZip(loc))
+	}
+
+	protected fun findInZip(loc: SpaceSafeURI, matches: Predicate<SpaceSafeURI>): SpaceSafeURI? {
+		val zipUri = getZipUri(loc)
+		return (cacheLock.read { cache[zipUri] } ?: cacheLock.write {
+			// Recheck, because unlocking read lock allows another thread to modify it
+			cache[zipUri] ?: run {
+				// Create the ZipReader if it doesn't exist, return null if getFileSource returns null
+				super.getFileSource(zipUri)?.let { ZipReader(it) }
+						?.also { cache[zipUri] = it }
+			}
+		})?.findInZip(matches)
+	}
+
+}

src/main/kotlin/link/infra/packwiz/installer/target/CachedTarget.kt

@@ -1,23 +0,0 @@
-package link.infra.packwiz.installer.target
-
-import link.infra.packwiz.installer.metadata.hash.Hash
-import java.nio.file.Path
-
-data class CachedTarget(
-	/**
-	 * @see Target.name
-	 */
-	val name: String,
-	/**
-	 * The location where the target was last downloaded to.
-	 * This is used for removing old files when the destination path changes.
-	 * This shouldn't be set to the .disabled path (that is manually appended and checked)
-	 */
-	val cachedLocation: Path,
-	val enabled: Boolean,
-	val hash: Hash<*>,
-	/**
-	 * For detecting when a target transitions non-optional -> optional and showing the option selection screen
-	 */
-	val isOptional: Boolean
-)

src/main/kotlin/link/infra/packwiz/installer/target/CachedTargetValidation.kt

@@ -1,95 +0,0 @@
-package link.infra.packwiz.installer.target
-
-import java.io.IOException
-import java.nio.file.*
-import java.nio.file.attribute.BasicFileAttributes
-import kotlin.io.path.relativeTo
-
-data class CachedTargetStatus(val target: CachedTarget, var isValid: Boolean, var markDisabled: Boolean)
-
-fun validate(targets: List<CachedTarget>, baseDir: Path) = runCatching {
-	val results = targets.map {
-		CachedTargetStatus(it, isValid = false, markDisabled = false)
-	}
-	val tree = buildTree(results, baseDir)
-
-	// Efficient file exists checking using directory listing, several orders of magnitude faster than Files.exists calls
-	Files.walkFileTree(baseDir, setOf(FileVisitOption.FOLLOW_LINKS), Int.MAX_VALUE, object : FileVisitor<Path> {
-		var currentNode: PathNode<CachedTargetStatus> = tree
-
-		override fun preVisitDirectory(dir: Path?, attrs: BasicFileAttributes?): FileVisitResult {
-			if (dir == null) {
-				return FileVisitResult.SKIP_SUBTREE
-			}
-			val subdirNode = currentNode.subdirs[dir.getName(dir.nameCount - 1)]
-			return if (subdirNode != null) {
-				currentNode = subdirNode
-				FileVisitResult.CONTINUE
-			} else {
-				FileVisitResult.SKIP_SUBTREE
-			}
-		}
-
-		override fun visitFile(file: Path?, attrs: BasicFileAttributes?): FileVisitResult {
-			if (file == null) {
-				return FileVisitResult.CONTINUE
-			}
-			// TODO: these are relative paths to baseDir
-			// TODO: strip the .disabled for lookup
-			val target = currentNode.files[file.getName(file.nameCount - 1)]
-			if (target != null) {
-				val disabledFile = file.endsWith(".disabled")
-				// If a .disabled file and the actual file both exist, mark as invalid if the target is disabled
-				if ((disabledFile )) {
-
-				}
-			}
-			return FileVisitResult.CONTINUE
-		}
-
-		@Throws(IOException::class)
-		override fun visitFileFailed(file: Path?, exc: IOException?): FileVisitResult {
-			if (exc != null) {
-				throw exc
-			}
-			throw IOException("visitFileFailed called with no exception")
-		}
-
-		@Throws(IOException::class)
-		override fun postVisitDirectory(dir: Path?, exc: IOException?): FileVisitResult {
-			if (exc != null) {
-				throw exc
-			} else {
-				val parent = currentNode.parent
-				if (parent != null) {
-					currentNode = parent
-				} else {
-					throw IOException("Invalid visitor tree structure")
-				}
-				return FileVisitResult.CONTINUE
-			}
-		}
-	})
-
-	results
-}
-
-fun buildTree(targets: List<CachedTargetStatus>, baseDir: Path): PathNode<CachedTargetStatus> {
-	val root = PathNode<CachedTargetStatus>()
-	for (target in targets) {
-		val relPath = target.target.cachedLocation.relativeTo(baseDir)
-		var node = root
-		// Traverse all the directory components, except for the last one
-		for (i in 0 until (relPath.nameCount - 1)) {
-			node = node.createSubdir(relPath.getName(i))
-		}
-		node.files[relPath.getName(relPath.nameCount - 1)] = target
-	}
-	return root
-}
-
-data class PathNode<T>(val subdirs: MutableMap<Path, PathNode<T>>, val files: MutableMap<Path, T>, val parent: PathNode<T>?) {
-	constructor() : this(mutableMapOf(), mutableMapOf(), null)
-
-	fun createSubdir(nextComponent: Path) = subdirs.getOrPut(nextComponent, { PathNode(mutableMapOf(), mutableMapOf(), this) })
-}

src/main/kotlin/link/infra/packwiz/installer/target/ClientHolder.kt

@@ -1,57 +0,0 @@
-package link.infra.packwiz.installer.target
-
-import link.infra.packwiz.installer.util.Log
-import okhttp3.OkHttpClient
-import okhttp3.Response
-import okio.FileSystem
-import java.net.SocketTimeoutException
-import java.util.concurrent.TimeUnit
-
-class ClientHolder {
-	// Tries 10s timeouts (default), then 15s timeouts, then 60s timeouts
-	private val retryTimes = arrayOf(15, 60)
-
-	// TODO: a button to increase timeouts temporarily when retrying? manual retry button?
-	val okHttpClient by lazy { OkHttpClient.Builder()
-		// Retry requests according to retryTimes list
-		.addInterceptor {
-			val req = it.request()
-
-			var lastException: SocketTimeoutException? = null
-			var res: Response? = null
-
-			try {
-				res = it.proceed(req)
-			} catch (e: SocketTimeoutException) {
-				lastException = e
-			}
-
-			var tryCount = 0
-			while (res == null && tryCount < retryTimes.size) {
-				Log.info("OkHttp connection to ${req.url} timed out; retrying... (${tryCount + 1}/${retryTimes.size})")
-
-				val longerTimeoutChain = it
-					.withConnectTimeout(retryTimes[tryCount], TimeUnit.SECONDS)
-					.withReadTimeout(retryTimes[tryCount], TimeUnit.SECONDS)
-					.withWriteTimeout(retryTimes[tryCount], TimeUnit.SECONDS)
-				try {
-					res = longerTimeoutChain.proceed(req)
-				} catch (e: SocketTimeoutException) {
-					lastException = e
-				}
-
-				tryCount++
-			}
-
-			res ?: throw lastException!!
-		}
-		.build() }
-
-	val fileSystem = FileSystem.SYSTEM
-
-	fun close() {
-		okHttpClient.dispatcher.cancelAll()
-		okHttpClient.dispatcher.executorService.shutdown()
-		okHttpClient.connectionPool.evictAll()
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/target/OverwriteMode.kt

@@ -1,13 +0,0 @@
-package link.infra.packwiz.installer.target
-
-enum class OverwriteMode {
-	/**
-	 * Overwrite the destination with the source file, if the source file has changed.
-	 */
-	IF_SRC_CHANGED,
-
-	/**
-	 * Never overwrite the destination; if it exists, it should not be written to.
-	 */
-	NEVER
-}

src/main/kotlin/link/infra/packwiz/installer/target/Side.kt

@@ -1,48 +0,0 @@
-package link.infra.packwiz.installer.target
-
-import cc.ekblad.toml.model.TomlValue
-import cc.ekblad.toml.tomlMapper
-import com.google.gson.annotations.SerializedName
-
-enum class Side(sideName: String) {
-	@SerializedName("client")
-	CLIENT("client"),
-	@SerializedName("server")
-	SERVER("server"),
-	@SerializedName("both")
-	@Suppress("unused")
-	BOTH("both") {
-		override fun hasSide(tSide: Side): Boolean {
-			return true
-		}
-	};
-
-	private val sideName: String
-
-	init {
-		this.sideName = sideName.lowercase()
-	}
-
-	override fun toString() = sideName
-
-	open fun hasSide(tSide: Side): Boolean {
-		return this == tSide || tSide == BOTH
-	}
-
-	companion object {
-		fun from(name: String): Side? {
-			val lowerName = name.lowercase()
-			for (side in values()) {
-				if (side.sideName == lowerName) {
-					return side
-				}
-			}
-			return null
-		}
-
-		fun mapper() = tomlMapper {
-			encoder { it: Side -> TomlValue.String(it.sideName) }
-			decoder { it: TomlValue.String -> from(it.value) ?: throw Exception("Invalid side name ${it.value}") }
-		}
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/target/Target.kt

@@ -1,45 +0,0 @@
-package link.infra.packwiz.installer.target
-
-import link.infra.packwiz.installer.target.path.PackwizPath
-
-// TODO: rename to avoid conflicting with @Target
-interface Target {
-	val src: PackwizPath<*>
-	val dest: PackwizPath<*>
-	val validityToken: ValidityToken
-
-	/**
-	 * Token interface for types used to compare Target identity. Implementations should use equals to indicate that
-	 * these tokens represent the same file; used to preserve optional target choices between file renames.
-	 */
-	interface IdentityToken
-
-	/**
-	 * Default implementation of IdentityToken that assumes files are not renamed; so optional choices do not need to
-	 * be preserved across renames.
-	 */
-	@JvmInline
-	value class PathIdentityToken(val path: PackwizPath<*>): IdentityToken
-
-	val ident: IdentityToken
-		get() = PathIdentityToken(dest) // TODO: should use local-rebased path?
-
-	/**
-	 * A user-friendly name; defaults to the destination path of the file.
-	 */
-	val name: String
-		get() = dest.filename
-	val side: Side
-		get() = Side.BOTH
-	val overwriteMode: OverwriteMode
-		get() = OverwriteMode.IF_SRC_CHANGED
-
-	interface Optional: Target {
-		val optional: Boolean
-		val optionalDefaultValue: Boolean
-	}
-
-	interface OptionalDescribed: Optional {
-		val optionalDescription: String
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/target/ValidityToken.kt

@@ -1,16 +0,0 @@
-package link.infra.packwiz.installer.target
-
-import link.infra.packwiz.installer.metadata.hash.Hash
-
-/**
- * A token used to determine if the source or destination file is changed, and ensure that the destination file is valid.
- */
-interface ValidityToken {
-	// TODO: functions to allow validating this from file metadata, from file, or during the download process
-
-	/**
-	 * Default implementation of ValidityToken based on a single hash.
-	 */
-	@JvmInline
-	value class HashValidityToken(val hash: Hash<*>): ValidityToken
-}

src/main/kotlin/link/infra/packwiz/installer/target/path/HttpUrlPath.kt

@@ -1,69 +0,0 @@
-package link.infra.packwiz.installer.target.path
-
-import link.infra.packwiz.installer.request.RequestException
-import link.infra.packwiz.installer.target.ClientHolder
-import okhttp3.HttpUrl
-import okhttp3.Request
-import okio.BufferedSource
-import okio.IOException
-
-class HttpUrlPath(private val url: HttpUrl, path: String? = null): PackwizPath<HttpUrlPath>(path) {
-	private fun build() = if (path == null) { url } else { url.newBuilder().addPathSegments(path).build() }
-
-	@Throws(RequestException::class)
-	override fun source(clientHolder: ClientHolder): BufferedSource {
-		val req = Request.Builder()
-			.url(build())
-			.header("Accept", "application/octet-stream")
-			.header("User-Agent", "packwiz-installer")
-			.get()
-			.build()
-		try {
-			val res = clientHolder.okHttpClient.newCall(req).execute()
-			// Can't use .use since it would close the response body before returning it to the caller
-			try {
-				if (!res.isSuccessful) {
-					throw RequestException.Response.HTTP.ErrorCode(req, res)
-				}
-
-				val body = res.body ?: throw RequestException.Internal.HTTP.NoResponseBody()
-				return body.source()
-			} catch (e: Exception) {
-				// If an exception is thrown, close the response and rethrow
-				res.close()
-				throw e
-			}
-		} catch (e: IOException) {
-			throw RequestException.Internal.HTTP.RequestFailed(e)
-		} catch (e: IllegalStateException) {
-			throw RequestException.Internal.HTTP.IllegalState(e)
-		}
-	}
-
-	override fun construct(path: String): HttpUrlPath = HttpUrlPath(url, path)
-
-	override val folder: Boolean
-		get() = pathFolder ?: (url.pathSegments.last() == "")
-	override val filename: String
-		get() = pathFilename ?: url.pathSegments.last()
-
-	override fun equals(other: Any?): Boolean {
-		if (this === other) return true
-		if (javaClass != other?.javaClass) return false
-		if (!super.equals(other)) return false
-
-		other as HttpUrlPath
-
-		if (url != other.url) return false
-
-		return true
-	}
-
-	override fun hashCode(): Int {
-		var result = super.hashCode()
-		result = 31 * result + url.hashCode()
-		return result
-	}
-
-	override fun toString() = build().toString()
-}

src/main/kotlin/link/infra/packwiz/installer/target/path/PackwizFilePath.kt

@@ -1,51 +0,0 @@
-package link.infra.packwiz.installer.target.path
-
-import link.infra.packwiz.installer.request.RequestException
-import link.infra.packwiz.installer.target.ClientHolder
-import okio.*
-
-class PackwizFilePath(private val base: Path, path: String? = null): PackwizPath<PackwizFilePath>(path) {
-	@Throws(RequestException::class)
-	override fun source(clientHolder: ClientHolder): BufferedSource {
-		val resolved = if (path == null) { base } else { this.base.resolve(path, true) }
-		try {
-			return clientHolder.fileSystem.source(resolved).buffer()
-		} catch (e: FileNotFoundException) {
-			throw RequestException.Response.File.FileNotFound(resolved.toString())
-		} catch (e: IOException) {
-			throw RequestException.Response.File.Other(e)
-		}
-	}
-
-	val nioPath: java.nio.file.Path get() {
-		val resolved = if (path == null) { base } else { this.base.resolve(path, true) }
-		return resolved.toNioPath()
-	}
-
-	override fun construct(path: String): PackwizFilePath = PackwizFilePath(base, path)
-
-	override val folder: Boolean
-		get() = pathFolder ?: (base.segments.last() == "")
-	override val filename: String
-		get() = pathFilename ?: base.segments.last()
-
-	override fun equals(other: Any?): Boolean {
-		if (this === other) return true
-		if (javaClass != other?.javaClass) return false
-		if (!super.equals(other)) return false
-
-		other as PackwizFilePath
-
-		if (base != other.base) return false
-
-		return true
-	}
-
-	override fun hashCode(): Int {
-		var result = super.hashCode()
-		result = 31 * result + base.hashCode()
-		return result
-	}
-
-	override fun toString() = nioPath.toString()
-}

src/main/kotlin/link/infra/packwiz/installer/target/path/PackwizPath.kt

@@ -1,128 +0,0 @@
-package link.infra.packwiz.installer.target.path
-
-import cc.ekblad.toml.model.TomlValue
-import cc.ekblad.toml.tomlMapper
-import com.google.gson.TypeAdapter
-import com.google.gson.stream.JsonReader
-import com.google.gson.stream.JsonWriter
-import link.infra.packwiz.installer.request.RequestException
-import link.infra.packwiz.installer.target.ClientHolder
-import okio.BufferedSource
-
-abstract class PackwizPath<T: PackwizPath<T>>(path: String? = null) {
-	protected val path: String?
-
-	init {
-		if (path != null) {
-			// Check for NUL bytes
-			if (path.contains('\u0000')) { throw RequestException.Validation.PathContainsNUL(path) }
-			// Normalise separator, to prevent differences between Unix/Windows
-			val pathNorm = path.replace('\\', '/')
-			// Split, create new lists for output
-			val split = pathNorm.split('/')
-			val canonicalised = mutableListOf<String>()
-
-			// Backward pass: collapse ".." components, remove "." components and empty components (except an empty component at the end; indicating a folder)
-			var parentComponentCount = 0
-			var first = true
-			for (component in split.asReversed()) {
-				if (first) {
-					first = false
-					if (component == "") {
-						canonicalised += component
-					}
-				}
-				// URL-encoded . is normalised
-				val componentNorm = component.replace("%2e", ".")
-				if (componentNorm == "." || componentNorm == "") {
-					// Do nothing
-				} else if (componentNorm == "..") {
-					parentComponentCount++
-				} else if (parentComponentCount > 0) {
-					parentComponentCount--
-				} else {
-					canonicalised += componentNorm
-					// Don't allow volume letters (allows traversal to the root on Windows)
-					if (componentNorm.length == 2) {
-						if (componentNorm[0] in 'a'..'z' || componentNorm[0] in 'A'..'Z') {
-							if (componentNorm[1] == ':') {
-								throw RequestException.Validation.PathContainsVolumeLetter(path)
-							}
-						}
-					}
-				}
-			}
-
-			if (canonicalised.isEmpty()) {
-				this.path = null
-			} else {
-				// Join path
-				this.path = canonicalised.asReversed().joinToString("/")
-			}
-		} else {
-			this.path = null
-		}
-	}
-
-	protected abstract fun construct(path: String): T
-
-	protected val pathFolder: Boolean? get() = path?.endsWith("/")
-	abstract val folder: Boolean
-	protected val pathFilename: String? get() = path?.split("/")?.last()
-	abstract val filename: String
-
-	fun resolve(path: String): T {
-		return if (path.startsWith('/') || path.startsWith('\\')) {
-			// Absolute (but still relative to base of pack)
-			construct(path)
-		} else if (folder) {
-			// File in folder; append
-			construct((this.path ?: "") + path)
-		} else {
-			// File in parent folder; append with parent component
-			construct((this.path ?: "") + "/../" + path)
-		}
-	}
-
-	operator fun div(path: String) = resolve(path)
-
-	fun <U: PackwizPath<U>> rebase(path: U) = path.resolve(this.path ?: "")
-
-	val parent: T get() = resolve(if (folder) { ".." } else { "." })
-
-	/**
-	 * Obtain a BufferedSource for this path
-	 * @throws RequestException When resolving the file failed
-	 */
-	@Throws(RequestException::class)
-	abstract fun source(clientHolder: ClientHolder): BufferedSource
-
-	override fun equals(other: Any?): Boolean {
-		if (this === other) return true
-		if (javaClass != other?.javaClass) return false
-
-		other as PackwizPath<*>
-
-		if (path != other.path) return false
-
-		return true
-	}
-
-	override fun hashCode() = path.hashCode()
-
-	companion object {
-		fun mapperRelativeTo(base: PackwizPath<*>) = tomlMapper {
-			encoder { it: PackwizPath<*> -> TomlValue.String(it.path ?: "") }
-			decoder { it: TomlValue.String -> base.resolve(it.value) }
-		}
-
-		fun <T: PackwizPath<T>> adapterRelativeTo(base: T) = object : TypeAdapter<T>() {
-			override fun write(writer: JsonWriter, value: T?) {
-				writer.value(value?.path)
-			}
-			override fun read(reader: JsonReader) = base.resolve(reader.nextString())
-		}
-	}
-
-	override fun toString() = "(Unknown base) $path"
-}

src/main/kotlin/link/infra/packwiz/installer/task/CacheKey.kt

@@ -1,3 +0,0 @@
-package link.infra.packwiz.installer.task
-
-data class CacheKey<T>(val key: String, val version: Int)

src/main/kotlin/link/infra/packwiz/installer/task/CacheManager.kt

@@ -1,22 +0,0 @@
-package link.infra.packwiz.installer.task
-
-import kotlin.reflect.KProperty
-
-class CacheManager {
-	class CacheValue<T> {
-		operator fun getValue(thisVal: Any?, property: KProperty<*>): T {
-			TODO("Not yet implemented")
-		}
-
-		operator fun setValue(thisVal: Any?, property: KProperty<*>, value: T) {
-			TODO("Not yet implemented")
-		}
-
-	}
-
-	operator fun <T> get(cacheKey: CacheKey<T>): CacheValue<T> {
-		return CacheValue()
-	}
-
-
-}

src/main/kotlin/link/infra/packwiz/installer/task/Task.kt

@@ -1,20 +0,0 @@
-package link.infra.packwiz.installer.task
-
-import kotlin.reflect.KMutableProperty0
-
-// TODO: task processing on 1 background thread; actual resolving of values calls out to a thread group
-// TODO: progress bar is updated from each of these tasks
-// TODO: have everything be lazy so there's no need to determine task ordering upfront? a bit like rust async - task results must be queried to occur
-
-abstract class Task<T>(protected val ctx: TaskContext): TaskInput<T> {
-	// TODO: lazy wrapper for fallible results
-	// TODO: multithreaded fanout subclass/helper
-
-	protected fun <T> wasUpdated(value: KMutableProperty0<T>, newValue: T): Boolean {
-		if (value.get() == newValue) {
-			return false
-		}
-		value.set(newValue)
-		return true
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/task/TaskCombinedResult.kt

@@ -1,6 +0,0 @@
-package link.infra.packwiz.installer.task
-
-/**
- * An object for storing results where result and upToDate are calculated simultaneously
- */
-data class TaskCombinedResult<T>(val result: T, val upToDate: Boolean)

src/main/kotlin/link/infra/packwiz/installer/task/TaskContext.kt

@@ -1,12 +0,0 @@
-package link.infra.packwiz.installer.task
-
-import link.infra.packwiz.installer.target.ClientHolder
-
-class TaskContext {
-	// TODO: thread pools, protocol roots
-	// TODO: cache management
-
-	val cache = CacheManager()
-
-	val clients = ClientHolder()
-}

src/main/kotlin/link/infra/packwiz/installer/task/TaskInput.kt

@@ -1,29 +0,0 @@
-package link.infra.packwiz.installer.task
-
-import kotlin.reflect.KProperty
-
-interface TaskInput<T> {
-	/**
-	 * The value of this task input. May be lazily evaluated; must be threadsafe.
-	 */
-	val value: T
-
-	/**
-	 * True if the effective value of this input has changed since the task was last run.
-	 * Doesn't require evaluation of the input value; should use cached data if possible.
-	 * May be lazily evaluated; must be threadsafe.
-	 */
-	val upToDate: Boolean
-
-	operator fun getValue(thisVal: Any?, property: KProperty<*>): T = value
-
-	companion object {
-		fun <T> raw(value: T): TaskInput<T> {
-			return object: TaskInput<T> {
-				override val value = value
-				override val upToDate: Boolean
-					get() = false
-			}
-		}
-	}
-}

src/main/kotlin/link/infra/packwiz/installer/task/formats/packwizv1/PackwizV1PackFile.kt

@@ -1,6 +0,0 @@
-package link.infra.packwiz.installer.task.formats.packwizv1
-
-import link.infra.packwiz.installer.metadata.hash.Hash
-import link.infra.packwiz.installer.target.path.PackwizPath
-
-data class PackwizV1PackFile(val name: String, val indexPath: PackwizPath<*>, val indexHash: Hash<*>)

src/main/kotlin/link/infra/packwiz/installer/task/formats/packwizv1/PackwizV1PackTomlTask.kt

@@ -1,48 +0,0 @@
-package link.infra.packwiz.installer.task.formats.packwizv1
-
-import com.google.gson.annotations.SerializedName
-import link.infra.packwiz.installer.metadata.hash.Hash
-import link.infra.packwiz.installer.metadata.hash.HashFormat
-import link.infra.packwiz.installer.target.path.PackwizPath
-import link.infra.packwiz.installer.task.CacheKey
-import link.infra.packwiz.installer.task.Task
-import link.infra.packwiz.installer.task.TaskCombinedResult
-import link.infra.packwiz.installer.task.TaskContext
-
-class PackwizV1PackTomlTask(ctx: TaskContext, val path: PackwizPath<*>): Task<PackwizV1PackFile>(ctx) {
-	// TODO: make hierarchically defined by caller? - then changing the pack format type doesn't leave junk in the cache
-	private var cache by ctx.cache[CacheKey<Hash<*>>("packwiz.v1.packtoml.hash", 1)]
-
-	private class PackFile {
-		var name: String? = null
-		var index: IndexFileLoc? = null
-
-		class IndexFileLoc {
-			var file: String? = null
-			@SerializedName("hash-format")
-			var hashFormat: HashFormat<*>? = null
-			var hash: String? = null
-		}
-
-		var versions: Map<String, String>? = null
-	}
-
-	private val internalResult by lazy {
-		// TODO: query, parse JSON
-		val packFile = PackFile()
-			//Toml().read(InputStreamReader(path.source(ctx.clients).inputStream(), "UTF-8")).to(PackFile::class.java)
-
-		val hashFormat = (packFile.index?.hashFormat ?: throw RuntimeException("Hash format required"))
-		val resolved = PackwizV1PackFile(
-			packFile.name ?: throw RuntimeException("Name required"), // TODO: better exception handling
-			path.resolve(packFile.index?.file ?: throw RuntimeException("File required")),
-			hashFormat.fromString(packFile.index?.hash ?: throw RuntimeException("Hash required"))
-		)
-		val hash = hashFormat.fromString("whatever was just read")
-
-		TaskCombinedResult(resolved, wasUpdated(::cache, hash))
-	}
-
-	override val value by internalResult::result
-	override val upToDate by internalResult::upToDate
-}

src/main/kotlin/link/infra/packwiz/installer/ui/IUserInterface.kt

@@ -23,13 +23,6 @@ interface IUserInterface {
 
 	fun showCancellationDialog(): CancellationResult = CancellationResult.QUIT
 
-	fun showUpdateConfirmationDialog(oldVersions: List<Pair<String, String?>>, newVersions: List<Pair<String, String?>>): UpdateConfirmationResult {
-		// Always update metadata when using the CLI
-		return UpdateConfirmationResult.UPDATE
-	}
-
-	fun awaitOptionalButton(showCancel: Boolean, timeout: Long)
-
 	enum class ExceptionListResult {
 		CONTINUE, CANCEL, IGNORE
 	}
@@ -38,22 +31,8 @@ interface IUserInterface {
 		QUIT, CONTINUE
 	}
 
-	enum class UpdateConfirmationResult {
-		CANCELLED, CONTINUE, UPDATE
-	}
-
 	var optionsButtonPressed: Boolean
 	var cancelButtonPressed: Boolean
-	var cancelCallback: (() -> Unit)?
 
 	var firstInstall: Boolean
-
-}
-
-inline fun <T> IUserInterface.wrap(message: String, inner: () -> T): T {
-	return try {
-		inner.invoke()
-	} catch (e: Exception) {
-		showErrorAndExit(message, e)
-	}
 }

src/main/kotlin/link/infra/packwiz/installer/ui/cli/CLIHandler.kt

@@ -11,12 +11,9 @@ import kotlin.system.exitProcess
 class CLIHandler : IUserInterface {
 	@Volatile
 	override var optionsButtonPressed = false
-	// TODO: treat ctrl+c as cancel?
 	@Volatile
 	override var cancelButtonPressed = false
 	@Volatile
-	override var cancelCallback: (() -> Unit)? = null
-	@Volatile
 	override var firstInstall = false
 
 	override var title: String = ""
@@ -62,8 +59,4 @@ class CLIHandler : IUserInterface {
 		}
 		return ExceptionListResult.CANCEL
 	}
-
-	override fun awaitOptionalButton(showCancel: Boolean, timeout: Long) {
-		// Do nothing
-	}
 }

src/main/kotlin/link/infra/packwiz/installer/ui/data/ExceptionDetails.kt

@@ -2,6 +2,5 @@ package link.infra.packwiz.installer.ui.data
 
 data class ExceptionDetails(
 		val name: String,
-		val exception: Exception,
-		val modUrl: String? = null
+		val exception: Exception
 )

src/main/kotlin/link/infra/packwiz/installer/ui/gui/ExceptionListWindow.kt

@@ -1,6 +1,5 @@
 package link.infra.packwiz.installer.ui.gui
 
-import link.infra.packwiz.installer.util.Log
 import link.infra.packwiz.installer.ui.IUserInterface
 import link.infra.packwiz.installer.ui.data.ExceptionDetails
 import java.awt.BorderLayout
@@ -25,24 +24,6 @@ class ExceptionListWindow(eList: List<ExceptionDetails>, future: CompletableFutu
 		fun getExceptionAt(index: Int) = details[index].exception
 	}
 
-	private fun openUrl(url: String) {
-		try {
-			if (Desktop.isDesktopSupported() && Desktop.getDesktop().isSupported(Desktop.Action.BROWSE)) {
-				Desktop.getDesktop().browse(URI(url))
-			} else {
-				val process = Runtime.getRuntime().exec(arrayOf("xdg-open", url));
-				val exitValue = process.waitFor()
-				if (exitValue > 0) {
-					Log.warn("Failed to open $url: xdg-open exited with code $exitValue")
-				}
-			}
-		} catch (e: IOException) {
-			Log.warn("Failed to open $url", e)
-		} catch (e: URISyntaxException) {
-			Log.warn("Failed to open $url", e)
-		}
-	}
-
 	/**
 	 * Create the dialog.
 	 */
@@ -131,19 +112,6 @@ class ExceptionListWindow(eList: List<ExceptionDetails>, future: CompletableFutu
 							this@ExceptionListWindow.dispose()
 						}
 					})
-
-					val missingMods = eList.filter { it.modUrl != null }.map { it.modUrl!! }.toSet()
-
-					if (!missingMods.isEmpty()) {
-						add(JButton("Open missing mods").apply {
-							toolTipText = "Open missing mods in your browser"
-							addActionListener {
-								missingMods.forEach {
-									openUrl(it)
-								}
-							}
-						})
-					}
 				}, BorderLayout.EAST)
 
 				// Errored label
@@ -154,8 +122,16 @@ class ExceptionListWindow(eList: List<ExceptionDetails>, future: CompletableFutu
 				// Left buttons
 				add(JPanel().apply {
 					add(JButton("Report issue").apply {
+						if (Desktop.isDesktopSupported() && Desktop.getDesktop().isSupported(Desktop.Action.BROWSE)) {
 							addActionListener {
-							openUrl("https://github.com/packwiz/packwiz-installer/issues/new")
+								try {
+									Desktop.getDesktop().browse(URI("https://github.com/comp500/packwiz-installer/issues/new"))
+								} catch (e: IOException) {
+									// lol the button just won't work i guess
+								} catch (e: URISyntaxException) {}
+							}
+						} else {
+							isEnabled = false
 						}
 					})
 				}, BorderLayout.WEST)

src/main/kotlin/link/infra/packwiz/installer/ui/gui/GUIHandler.kt

@@ -7,13 +7,10 @@ import link.infra.packwiz.installer.ui.data.IOptionDetails
 import link.infra.packwiz.installer.ui.data.InstallProgress
 import link.infra.packwiz.installer.util.Log
 import java.awt.EventQueue
-import java.util.Timer
 import java.util.concurrent.CompletableFuture
-import java.util.concurrent.CountDownLatch
 import javax.swing.JDialog
 import javax.swing.JOptionPane
 import javax.swing.UIManager
-import kotlin.concurrent.timer
 import kotlin.system.exitProcess
 
 class GUIHandler : IUserInterface {
@@ -21,24 +18,8 @@ class GUIHandler : IUserInterface {
 
 	@Volatile
 	override var optionsButtonPressed = false
-		set(value) {
-			optionalSelectedLatch.countDown()
-			field = value
-		}
 	@Volatile
 	override var cancelButtonPressed = false
-		set(value) {
-			optionalSelectedLatch.countDown()
-			field = value
-			cancelCallback?.invoke()
-		}
-	@Volatile
-	override var cancelCallback: (() -> Unit)? = null
-	var okButtonPressed = false
-		set(value) {
-			optionalSelectedLatch.countDown()
-			field = value
-		}
 	@Volatile
 	override var firstInstall = false
 
@@ -61,12 +42,8 @@ class GUIHandler : IUserInterface {
 		}
 	}
 
-	private val visibleCountdownLatch = CountDownLatch(1)
-	private val optionalSelectedLatch = CountDownLatch(1)
-
 	override fun show() = EventQueue.invokeLater {
 		frmPackwizlauncher.isVisible = true
-		visibleCountdownLatch.countDown()
 	}
 
 	override fun dispose() = EventQueue.invokeAndWait {
@@ -170,82 +147,4 @@ class GUIHandler : IUserInterface {
 		}
 		return future.get()
 	}
-
-	override fun showUpdateConfirmationDialog(oldVersions: List<Pair<String, String?>>, newVersions: List<Pair<String, String?>>): IUserInterface.UpdateConfirmationResult {
-		assert(newVersions.isNotEmpty())
-		val future = CompletableFuture<IUserInterface.UpdateConfirmationResult>()
-		EventQueue.invokeLater {
-			val oldVersIndex = oldVersions.map { it.first to it.second }.toMap()
-			val newVersIndex = newVersions.map { it.first to it.second }.toMap()
-			val message = StringBuilder()
-			message.append("<html>" +
-					"This modpack uses newer versions of the following:<br>" +
-					"<ul>")
-
-			for (oldVer in oldVersions) {
-				val correspondingNewVer = newVersIndex[oldVer.first]
-				message.append("<li>")
-				message.append(oldVer.first.replaceFirstChar { it.uppercase() })
-				message.append(": <font color=${if (oldVer.second != correspondingNewVer) "#ff0000" else "#000000"}>")
-				message.append(oldVer.second ?: "Not found")
-				message.append("</font></li>")
-			}
-			message.append("</ul>")
-
-			message.append("New versions:" +
-					"<ul>")
-			for (newVer in newVersions) {
-				val correspondingOldVer = oldVersIndex[newVer.first]
-				message.append("<li>")
-				message.append(newVer.first.replaceFirstChar { it.uppercase() })
-				message.append(": <font color=${if (newVer.second != correspondingOldVer) "#00ff00" else "#000000"}>")
-				message.append(newVer.second ?: "Not found")
-				message.append("</font></li>")
-			}
-			message.append("</ul><br>" +
-					"Would you like to update the versions, launch without updating, or cancel the launch?")
-
-
-			val options = arrayOf("Cancel", "Continue anyways", "Update")
-			val result = JOptionPane.showOptionDialog(frmPackwizlauncher, message,
-					"Updating MultiMC versions",
-					JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[2])
-			future.complete(
-				when (result) {
-					JOptionPane.CLOSED_OPTION, 0 -> IUserInterface.UpdateConfirmationResult.CANCELLED
-					1 -> IUserInterface.UpdateConfirmationResult.CONTINUE
-					2 -> IUserInterface.UpdateConfirmationResult.UPDATE
-					else -> IUserInterface.UpdateConfirmationResult.CANCELLED
-				}
-			)
-		}
-		return future.get()
-	}
-
-	override fun awaitOptionalButton(showCancel: Boolean, timeout: Long) {
-		EventQueue.invokeAndWait {
-			frmPackwizlauncher.showOk(!showCancel)
-		}
-		visibleCountdownLatch.await()
-
-		var closeTimer: Timer? = null
-		if (timeout >= 0) {
-			var count = 0
-			closeTimer = timer("timeout", true, 0, 1000) {
-				if (count >= timeout) {
-					optionalSelectedLatch.countDown()
-					cancel()
-				} else {
-					frmPackwizlauncher.timeoutOk(timeout - count)
-					count += 1
-				}
-			};
-		}
-
-		optionalSelectedLatch.await()
-		closeTimer?.cancel()
-		EventQueue.invokeLater {
-			frmPackwizlauncher.hideOk()
-		}
-	}
 }

src/main/kotlin/link/infra/packwiz/installer/ui/gui/InstallWindow.kt

@@ -12,9 +12,6 @@ class InstallWindow(private val handler: GUIHandler) : JFrame() {
 	private var lblProgresslabel: JLabel
 	private var progressBar: JProgressBar
 	private var btnOptions: JButton
-	private val btnCancel: JButton
-	private val btnOk: JButton
-	private val buttonsPanel: JPanel
 
 	init {
 		setBounds(100, 100, 493, 95)
@@ -38,7 +35,7 @@ class InstallWindow(private val handler: GUIHandler) : JFrame() {
 		}, BorderLayout.CENTER)
 
 		// Buttons
-		buttonsPanel = JPanel().apply {
+		add(JPanel().apply {
 			border = EmptyBorder(0, 5, 0, 5)
 			layout = GridBagLayout()
 
@@ -52,28 +49,20 @@ class InstallWindow(private val handler: GUIHandler) : JFrame() {
 				}
 			}
 			add(btnOptions, GridBagConstraints().apply {
-				gridx = 1
+				gridx = 0
 				gridy = 0
 			})
 
-			btnCancel = JButton("Cancel").apply {
+			add(JButton("Cancel").apply {
 				addActionListener {
 					isEnabled = false
 					handler.cancelButtonPressed = true
 				}
-			}
-			add(btnCancel, GridBagConstraints().apply {
-				gridx = 1
+			}, GridBagConstraints().apply {
+				gridx = 0
 				gridy = 1
 			})
-		}
-
-		btnOk = JButton("Continue").apply {
-			addActionListener {
-				handler.okButtonPressed = true
-			}
-		}
-		add(buttonsPanel, BorderLayout.EAST)
+		}, BorderLayout.EAST)
 	}
 
 	fun displayProgress(progress: InstallProgress) {
@@ -94,35 +83,4 @@ class InstallWindow(private val handler: GUIHandler) : JFrame() {
  			isEnabled = false
 		}
 	}
-
-	fun showOk(hideCancel: Boolean) {
-		if (hideCancel) {
-			buttonsPanel.add(btnOk, GridBagConstraints().apply {
-				gridx = 1
-				gridy = 1
-			})
-			buttonsPanel.remove(btnCancel)
-		} else {
-			buttonsPanel.add(btnOk, GridBagConstraints().apply {
-				gridx = 0
-				gridy = 1
-			})
-		}
-		buttonsPanel.revalidate()
-	}
-
-	fun hideOk() {
-		buttonsPanel.remove(btnOk)
-		if (!buttonsPanel.components.contains(btnCancel)) {
-			buttonsPanel.add(btnCancel, GridBagConstraints().apply {
-				gridx = 1
-				gridy = 1
-			})
-		}
-		buttonsPanel.revalidate()
-	}
-
-	fun timeoutOk(remaining: Long) {
-		btnOk.text = "Continue ($remaining)"
-	}
 }

src/main/kotlin/link/infra/packwiz/installer/util/4KDelegation.kt

@@ -1,10 +0,0 @@
-package link.infra.packwiz.installer.util
-
-import cc.ekblad.toml.TomlMapper
-import cc.ekblad.toml.configuration.TomlMapperConfigurator
-import cc.ekblad.toml.model.TomlValue
-
-inline fun <reified T: Any> TomlMapperConfigurator.delegateTransitive(mapper: TomlMapper) {
-	decoder { it: TomlValue -> mapper.decode<T>(it) }
-	encoder { it: T -> mapper.encode(it) }
-}

src/main/kotlin/link/infra/packwiz/installer/util/Exts.kt

@@ -0,0 +1,38 @@
+package link.infra.packwiz.installer.util
+
+import link.infra.packwiz.installer.ui.IUserInterface
+
+inline fun <T> iflet(value: T?, whenNotNull: (T) -> Unit) {
+	if (value != null) {
+		whenNotNull(value)
+	}
+}
+
+inline fun <T, U> IUserInterface.ifletOrErr(value: T?, message: String, whenNotNull: (T) -> U): U =
+	if (value != null) {
+		whenNotNull(value)
+	} else {
+		this.showErrorAndExit(message)
+	}
+
+inline fun <T, U, V> IUserInterface.ifletOrErr(value: T?, value2: U?, message: String, whenNotNull: (T, U) -> V): V =
+	if (value != null && value2 != null) {
+		whenNotNull(value, value2)
+	} else {
+		this.showErrorAndExit(message)
+	}
+
+inline fun <T> ifletOrWarn(value: T?, message: String, whenNotNull: (T) -> Unit) {
+	if (value != null) {
+		whenNotNull(value)
+	} else {
+		Log.warn(message)
+	}
+}
+
+inline fun <T, U> iflet(value: T?, whenNotNull: (T) -> U, whenNull: () -> U): U =
+	if (value != null) {
+		whenNotNull(value)
+	} else {
+		whenNull()
+	}

src/main/proguard.txt

@@ -1,19 +0,0 @@
--dontoptimize
--dontobfuscate
-
-# Used by Okio and OkHttp
--dontwarn org.codehaus.mojo.animal_sniffer.*
--dontwarn okhttp3.internal.platform.**
--dontwarn org.conscrypt.**
--dontwarn org.bouncycastle.**
--dontwarn org.openjsse.**
-
--keep class !link.infra.packwiz.installer.deps.**,link.infra.packwiz.installer.** { *; }
-
--keep class com.google.gson.reflect.TypeToken { *; }
--keep class * extends com.google.gson.reflect.TypeToken
-
--keep @interface kotlin.Metadata { *; }
-
--renamesourcefileattribute SourceFile
--keepattributes *Annotation*,SourceFile,LineNumberTable,Signature

src/main/resources/META-INF/LICENSES.md

@@ -1,20 +1,14 @@
 # Licenses
 
-packwiz-installer itself is under the MIT license ([Source](https://github.com/packwiz/packwiz-installer)), except for Murmur2Lib and bundled dependencies as follows:
+packwiz-installer itself is under the MIT license, except for Murmur2Lib and bundled dependencies as follows:
 
 - Murmur2Lib: Apache 2.0 ([Source](https://github.com/prasanthj/hasher/blob/master/src/main/java/hasher/Murmur2.java))
-  - Copyright 2014 Prasanth Jayachandran
-- Google Gson 2.9.0: Apache 2.0 ([Source](https://github.com/google/gson))
-  - Copyright 2008 Google Inc.
-- Okio 3.1.0: Apache 2.0 ([Source](https://github.com/square/okio/))
-  - Copyright 2013 Square, Inc.
-- Commons CLI 1.5: Apache 2.0 ([Source](http://commons.apache.org/proper/commons-cli/))
+- Google Gson 2.8.1: Apache 2.0 ([Source](https://github.com/google/gson))
+- Okio 2.9.0: Apache 2.0 ([Source](https://github.com/square/okio/))
+- Commons CLI 1.4: Apache 2.0 ([Source](http://commons.apache.org/proper/commons-cli/))
 - Jetbrains Annotations 13.0: Apache 2.0 ([Source](https://github.com/JetBrains/java-annotations))
-  - Copyright 2000-2016 JetBrains s.r.o.
-- Kotlin Standard Library 1.7.10: Apache 2.0 ([Source](https://github.com/JetBrains/kotlin))
-  - Copyright 2010-2020 JetBrains s.r.o and respective authors and developers
-- 4koma 1.1.0: MIT ([Source](https://github.com/valderman/4koma))
-  - Copyright (c) 2021 Anton Ekblad
+- Kotlin Standard Library 1.4.21: Apache 2.0 ([Source](https://github.com/JetBrains/kotlin))
+- toml4j 0.7.2: MIT ([Source](https://github.com/mwanji/toml4j))
 
 ## Associated notices
 
@@ -28,6 +22,10 @@ The Apache Software Foundation (http://www.apache.org/).
 ## Full license texts
 
 ### MIT
+MIT License
+
+Copyright (c)
+
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
@@ -250,15 +248,3 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 
-### ISC
-Permission to use, copy, modify, and/or distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
-
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.