WIP curseforge integration

curseforge/request.go

@@ -0,0 +1,86 @@
+package curseforge
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+)
+
+// AddonSlugRequest is sent to the CurseProxy GraphQL api to get the id from a slug
+type AddonSlugRequest struct {
+	Query     string `json:"query"`
+	Variables struct {
+		Slug string `json:"slug"`
+	} `json:"variables"`
+}
+
+// AddonSlugResponse is received from the CurseProxy GraphQL api to get the id from a slug
+type AddonSlugResponse struct {
+	Data struct {
+		Addons []struct {
+			ID int `json:"id"`
+		} `json:"addons"`
+	} `json:"data"`
+	Exception  string   `json:"exception"`
+	Message    string   `json:"message"`
+	Stacktrace []string `json:"stacktrace"`
+}
+
+// Most of this is shamelessly copied from my previous attempt at modpack management:
+// https://github.com/comp500/modpack-editor/blob/master/query.go
+func modIDFromSlug(slug string) (int, error) {
+	request := AddonSlugRequest{
+		Query: `
+		query getIDFromSlug($slug: String) {
+			{
+				addons(slug: $slug) {
+					id
+				}
+			}
+		}
+		`,
+	}
+	request.Variables.Slug = slug
+
+	// Uses the curse.nikky.moe GraphQL api
+	var response AddonSlugResponse
+	client := &http.Client{}
+
+	requestBytes, err := json.Marshal(request)
+	if err != nil {
+		return 0, err
+	}
+
+	req, err := http.NewRequest("POST", "https://curse.nikky.moe/graphql", bytes.NewBuffer(requestBytes))
+	if err != nil {
+		return 0, err
+	}
+
+	// TODO: make this configurable application-wide
+	req.Header.Set("User-Agent", "comp500/packwiz client")
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return 0, err
+	}
+
+	err = json.NewDecoder(resp.Body).Decode(&response)
+	if err != nil && err != io.EOF {
+		return 0, err
+	}
+
+	if len(response.Exception) > 0 || len(response.Message) > 0 {
+		return 0, fmt.Errorf("Error requesting id for slug: %s", response.Message)
+	}
+
+	if len(response.Data.Addons) < 1 {
+		return 0, errors.New("Addon not found")
+	}
+
+	return response.Data.Addons[0].ID, nil
+}
+