working on forge integration

fclauncher/InstanceManager.go

@@ -289,6 +289,10 @@ func (i *InstanceManager) LaunchInstance(instance string) {
 	if err != nil {
 		fmt.Printf("unable to get launch args: %s\n", err)
 	}
+	if instanceObject.ForgeVersion != "" {
+		args = append(args, "--launchTarget")
+		args = append(args, "forge_client")
+	}
 	fmt.Printf("Args: %+v", args)
 	child := exec.Command(filepath.Join(dir, "java", fmt.Sprintf("java-%d-%s", instanceObject.JavaVersion, suffix), "bin", execName), args...)
 	child.Dir = filepath.Join(dir, "instances", instance, "minecraft")
@@ -415,3 +419,44 @@ common:
 		}
 	}
 }
+
+func (i *InstanceManager) InstallForge(instance string, forgeVersion string) {
+	instanceObject, err := i.GetInstance(instance)
+	if err != nil {
+		fmt.Printf("Unable to find instance: %s\n", err)
+	}
+	installData, err := GetForgeInstallData(instanceObject.MinecraftVersion, forgeVersion)
+	if err != nil {
+		fmt.Printf("Unable to get install data: %s\n", err)
+	}
+	dir, _ := os.UserConfigDir()
+	InstallForgeLibs(instanceObject.MinecraftVersion, forgeVersion, filepath.Join(dir, "FCLauncher", "lib"))
+	instanceObject.ForgeVersion = forgeVersion
+outer:
+	for _, lib := range installData.Libraries {
+		tokens := strings.Split(lib.Downloads.Artifact.Path, string(os.PathSeparator))
+		pkg := tokens[len(tokens)-2]
+		instanceObject.Libraries = append(instanceObject.Libraries, lib.Downloads.Artifact.Path)
+		for ind, path := range instanceObject.Libraries {
+			tokens := strings.Split(path, string(os.PathSeparator))
+			if pkg == tokens[len(tokens)-3] {
+				instanceObject.Libraries[ind] = filepath.Join(ProcessMavenPath(lib.Name), ProcessMavenFilename(lib.Name))
+				fmt.Printf("duplicate library %s\n", pkg)
+				continue outer
+			}
+		}
+	}
+	instanceObject.MainClass = installData.MainClass
+
+	f, _ := os.OpenFile(filepath.Join(dir, "FCLauncher", "instances", instance, "instance.json"), os.O_CREATE|os.O_RDWR, 0755)
+	data, _ := json.Marshal(instanceObject)
+	defer f.Close()
+	f.Write(data)
+	for ind, inst := range i.instances {
+		if inst.InstanceName == instance {
+			i.instances[ind] = instanceObject
+			break
+		}
+	}
+
+}

fclauncher/forge.go

@@ -1,10 +1,18 @@
 package main
 
 import (
+	"crypto/sha1"
+	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
+	"os"
+	"path/filepath"
 	"strings"
+	"time"
+
+	"github.com/zhyee/zipstream"
 )
 
 type Forge struct{}
@@ -15,6 +23,31 @@ type ForgeVersion struct {
 	Url     string
 }
 
+type ForgeLibraryArtifact struct {
+	Path string
+	Url  string
+	Sha1 string
+}
+
+type ForgeLibraryDownload struct {
+	Artifact ForgeLibraryArtifact
+}
+
+type ForgeLibrary struct {
+	Name      string
+	Downloads ForgeLibraryDownload
+}
+
+type ForgeInstallData struct {
+	Id           string
+	Time         time.Time
+	ReleaseTime  time.Time
+	InheritsFrom string
+	Type         string
+	MainClass    string
+	Libraries    []ForgeLibrary
+}
+
 func parseForgeVersions(html string) []ForgeVersion {
 	lines := strings.Split(html, "\n")
 	parsing := false
@@ -68,3 +101,85 @@ func (Forge) GetForgeVersions(mcVersion string) ([]ForgeVersion, error) {
 	data, _ := io.ReadAll(resp.Body)
 	return parseForgeVersions(string(data)), nil
 }
+
+func GetForgeInstallDataFromVersion(version ForgeVersion) (ForgeInstallData, error) {
+	resp, err := http.Get(version.Url)
+	if err != nil {
+		return ForgeInstallData{}, fmt.Errorf("unable to pull jar file: %e", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		return ForgeInstallData{}, fmt.Errorf("unable to pull jar file: %s", resp.Status)
+	}
+	zs := zipstream.NewReader(resp.Body)
+	for {
+		entry, err := zs.GetNextEntry()
+		if err == io.EOF {
+			break
+		}
+		if entry.Name != "version.json" {
+			continue
+		}
+		f, _ := entry.Open()
+		defer f.Close()
+		data, _ := io.ReadAll(f)
+		installData := ForgeInstallData{}
+		json.Unmarshal(data, &installData)
+		return installData, nil
+	}
+	return ForgeInstallData{}, fmt.Errorf("unable to find version.json")
+}
+
+func GetForgeInstallData(mcVersion string, forgeVersion string) (ForgeInstallData, error) {
+	versions, err := Forge{}.GetForgeVersions(mcVersion)
+	if err != nil {
+		return ForgeInstallData{}, fmt.Errorf("failed to pull forge versions: %e", err)
+	}
+	for _, version := range versions {
+		if version.Version == forgeVersion {
+			return GetForgeInstallDataFromVersion(version)
+		}
+	}
+	return ForgeInstallData{}, fmt.Errorf("unable to find the requested version")
+}
+
+func InstallForgeLibs(mcVersion string, forgeVersion string, libDir string) {
+	installData, err := GetForgeInstallData(mcVersion, forgeVersion)
+	if err != nil {
+		fmt.Printf("Unable to get install data: %s\n", err)
+	}
+	for _, lib := range installData.Libraries {
+		if _, err := os.Stat(filepath.Join(libDir, lib.Downloads.Artifact.Path)); err == nil {
+			if f, err := os.OpenFile(filepath.Join(libDir, lib.Downloads.Artifact.Path), os.O_RDONLY, 0755); err == nil {
+				defer f.Close()
+				data, _ := io.ReadAll(f)
+				sha := sha1.Sum(data)
+				if hex.EncodeToString(sha[:20]) == lib.Downloads.Artifact.Sha1 {
+					continue
+				}
+			}
+		}
+		resp, err := http.Get(lib.Downloads.Artifact.Url)
+		if err != nil {
+			fmt.Printf("Unable to download library %s: %s\n", lib.Name, err)
+			continue
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != 200 {
+			fmt.Printf("Unable to download library %s: %s\n", lib.Name, resp.Status)
+			continue
+		}
+		tokens := strings.Split(lib.Downloads.Artifact.Path, "/")
+		path := ""
+		for ind, token := range tokens {
+			if ind == len(tokens)-1 {
+				break
+			}
+			path = filepath.Join(path, token)
+		}
+		os.MkdirAll(filepath.Join(libDir, path), 0755)
+		f, _ := os.OpenFile(filepath.Join(libDir, lib.Downloads.Artifact.Path), os.O_CREATE|os.O_RDWR, 0755)
+		defer f.Close()
+		io.Copy(f, resp.Body)
+	}
+}

fclauncher/frontend/src/Instances.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import {InstallVanilla, LaunchInstance, GetInstances, InstallQuilt, InstallFabric, CheckUpdate} from '../wailsjs/go/main/InstanceManager.js'
+	import {InstallVanilla, LaunchInstance, GetInstances, InstallForge, InstallQuilt, InstallFabric, CheckUpdate} from '../wailsjs/go/main/InstanceManager.js'
 	import {GetVersions} from '../wailsjs/go/main/App.js'
 	import {GetFabricVersions} from '../wailsjs/go/main/Fabric.js'
 	import {GetQuiltVersions} from '../wailsjs/go/main/Quilt.js'
@@ -93,7 +93,13 @@
 					$loading = false
 					updateLists()
 				})
-
+			case "forge":
+				InstallForge(name, forge_ver).then(() => {
+					$addingInstance = false
+					$loading = false
+					updateLists()
+				})
+			break
 			}
 		})
 	}

fclauncher/frontend/wailsjs/go/main/InstanceManager.d.ts

@@ -10,6 +10,8 @@ export function GetInstances():Promise<Array<string>>;
 
 export function InstallFabric(arg1:string,arg2:string):Promise<void>;
 
+export function InstallForge(arg1:string,arg2:string):Promise<void>;
+
 export function InstallModpack(arg1:main.Modpack,arg2:string):Promise<void>;
 
 export function InstallQuilt(arg1:string,arg2:string):Promise<void>;

fclauncher/frontend/wailsjs/go/main/InstanceManager.js

@@ -18,6 +18,10 @@ export function InstallFabric(arg1, arg2) {
   return window['go']['main']['InstanceManager']['InstallFabric'](arg1, arg2);
 }
 
+export function InstallForge(arg1, arg2) {
+  return window['go']['main']['InstanceManager']['InstallForge'](arg1, arg2);
+}
+
 export function InstallModpack(arg1, arg2) {
   return window['go']['main']['InstanceManager']['InstallModpack'](arg1, arg2);
 }