Add initial minecraft-java-manager scaffold

Initial project scaffold for minecraft-java-manager. Adds package.json and package-lock.json, README update, index.js entrypoint and test.js. Introduces src modules: checker (detects Java version), installer (downloads JRE components with redirects, SHA1 validation, progress/events and concurrency), web (fetches launcher/runtime manifests and component data), systeminfo (platform key and install path resolution) and config (endpoints). Declares dependencies adm-zip and node-downloader-helper.

README.md

@@ -1,3 +1,5 @@
 # minecraft-java-manager
 
-Node module to check if java is installed and install it
+Node module to check if java is installed and install it
+
+There is two function, read index.js

index.js

@@ -0,0 +1,24 @@
+const installer = require("./src/installer")
+const checker = require("./src/checker")
+const sysinfo = require("./src/systeminfo")
+const web = require("./src/web")
+
+async function isJavaInstalledAndCompatibleFor(mcVersion, customExec = "java") {
+    const mcVersionManifestUrl = await web.getVersionManifest(mcVersion)
+    const requiredJRE = await web.getRequiredJREFor(mcVersionManifestUrl)
+    const checkJRECommand = checker.getJavaVersionOutput(customExec)
+    const isJavaCompatible = checker.isJavaCompatible(checkJRECommand, requiredJRE.majorVersion)
+    return isJavaCompatible
+}
+
+async function installJava(component, majorVersion, customInstallPath = null) {
+    const installationPath = await sysinfo.determineInstallationPath(component, majorVersion, customInstallPath)
+    const requiredComponentDetails = await web.getJREComponentDetails(component, sysinfo.getPlatformKey())
+    const requiredComponentManifest = await web.getJREComponentManifest(requiredComponentDetails[0].manifest.url)
+    return await installer.downloadJavaComponent(requiredComponentManifest, installationPath)
+}
+
+module.exports = {
+    isJavaInstalledAndCompatibleFor,
+    installJava
+}

package-lock.json

@@ -0,0 +1,38 @@
+{
+	"name": "minecraft-java-manager",
+	"version": "0.0.1",
+	"lockfileVersion": 3,
+	"requires": true,
+	"packages": {
+		"": {
+			"name": "minecraft-java-manager",
+			"version": "0.0.1",
+			"license": "MIT",
+			"dependencies": {
+				"adm-zip": "^0.6.0",
+				"node-downloader-helper": "^2.1.11"
+			}
+		},
+		"node_modules/adm-zip": {
+			"version": "0.6.0",
+			"resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.6.0.tgz",
+			"integrity": "sha512-XleryMhbuksdKtofnWZ9Sk+4CUTbms4Mb/EU32SZwToAyZ5RgVos/ki8n+yr0LWHOGKuakbXTuuYNHLQjhddgg==",
+			"license": "MIT",
+			"engines": {
+				"node": ">=14.0"
+			}
+		},
+		"node_modules/node-downloader-helper": {
+			"version": "2.1.11",
+			"resolved": "https://registry.npmjs.org/node-downloader-helper/-/node-downloader-helper-2.1.11.tgz",
+			"integrity": "sha512-882fH2C9AWdiPCwz/2beq5t8FGMZK9Dx8TJUOIxzMCbvG7XUKM5BuJwN5f0NKo4SCQK6jR4p2TPm54mYGdGchQ==",
+			"license": "MIT",
+			"bin": {
+				"ndh": "bin/ndh"
+			},
+			"engines": {
+				"node": ">=14.18"
+			}
+		}
+	}
+}

package.json

@@ -0,0 +1,24 @@
+{
+	"name": "minecraft-java-manager",
+	"version": "0.0.1",
+	"description": "Node module to check if java is installed and install it",
+	"repository": {
+		"type": "git",
+		"url": "https://gitea.azures.fr/azures04/minecraft-java-manager"
+	},
+	"license": "MIT",
+	"author": {
+		"name": "azures04",
+		"url": "https://gitea.azures.fr",
+		"email": "azures04@azures.fr"
+	},
+	"type": "commonjs",
+	"main": "index.js",
+	"scripts": {
+		"test": "echo \"Error: no test specified\" && exit 1"
+	},
+	"dependencies": {
+		"adm-zip": "^0.6.0",
+		"node-downloader-helper": "^2.1.11"
+	}
+}

src/checker.js

@@ -0,0 +1,37 @@
+const childProcess = require("node:child_process")
+
+function getJavaVersionOutput(defaultCommand = "java") {
+    try {
+        const command = childProcess.spawnSync(defaultCommand, ["-version"], {
+            encoding: "utf-8",
+            windowsHide: true,
+        })
+
+        if (command.error) {
+            return null
+        }
+
+        return command.stderr || command.stdout || ""
+    } catch {
+        return null
+    }
+}
+
+function parseJavaOutput(output) {
+    if (!output || typeof output !== "string") {
+        return null
+    }
+    
+    const match = output.match(/version\s+"(?:1\.)?(\d+)/i)
+    return match ? parseInt(match[1], 10) : null
+}
+
+function isJavaCompatible(output, requiredMajor) {
+    return parseJavaOutput(output) === requiredMajor
+}
+
+module.exports = {
+    getJavaVersionOutput,
+    isJavaCompatible,
+    parseJavaOutput,
+}

src/config.js

@@ -0,0 +1,31 @@
+const endpoints = {
+    allRuntimes: process.env.ALL_RUNTIMES || "https://launchermeta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json",
+    launcherManifest: process.env.LAUNCHER_MANIFEST || "https://launchermeta.mojang.com/mc/game/version_manifest_v2.json",
+}
+
+function setEndpoint(key, value) {
+    return endpoints[key] = value
+}
+
+function getEndpoint(key) {
+    return endpoints[key]
+}
+
+module.exports = {
+    allRuntimes: {
+        set: (value) => {
+            return setEndpoint("allRuntimes", value)
+        },
+        get: () => {
+            return getEndpoint("allRuntimes")
+        }
+    },
+    launcherManifest: {
+        set: (value) => {
+            return setEndpoint("launcherManifest", value)
+        },
+        get: () => {
+            return getEndpoint("launcherManifest")
+        }
+    }
+}

src/installer.js

@@ -0,0 +1,247 @@
+const https = require("https")
+const fs = require("fs")
+const path = require("path")
+const crypto = require("crypto")
+const { EventEmitter } = require("events")
+const web = require("./web") 
+const sysinfo = require("./systeminfo")
+
+function extractDownloadableFiles(manifest) {
+    const filePaths = Object.keys(manifest.files)
+    const entries = []
+
+    for (const filePath of filePaths) {
+        const fileEntry = manifest.files[filePath]
+
+        if (fileEntry.type !== "file") {
+            continue
+        }
+
+        const downloadInfo = fileEntry.downloads.raw || fileEntry.downloads.lzma
+
+        if (!downloadInfo) {
+            continue
+        }
+
+        entries.push({
+            filePath: filePath,
+            url: downloadInfo.url,
+            sha1: downloadInfo.sha1,
+            size: downloadInfo.size,
+            executable: fileEntry.executable || false
+        })
+    }
+
+    return entries
+}
+
+function requestWithRedirect(url, onResponse, maxRedirects = 5) {
+    return new Promise((resolve, reject) =>  {
+
+        function makeRequest(currentUrl, redirectsLeft) {
+            https.get(currentUrl, (response) => {
+
+                const statusCode = response.statusCode
+
+                if (statusCode >= 300 && statusCode < 400 && response.headers.location) {
+                    response.resume()
+
+                    if (redirectsLeft <= 0) {
+                        reject(new Error("Too many http redirection"))
+                        return
+                    }
+
+                    makeRequest(response.headers.location, redirectsLeft - 1)
+                    return
+                }
+
+                if (statusCode !== 200) {
+                    response.resume()
+                    reject(new Error(`HTTP Failed: received status code ${statusCode} for ${currentUrl}`))
+                    return
+                }
+
+                try {
+                    onResponse(response)
+                    resolve()
+                } catch (err) {
+                    reject(err)
+                }
+
+            }).on("error", (err) => {
+                reject(err)
+            })
+        }
+
+        makeRequest(url, maxRedirects)
+    })
+}
+async function downloadSingleFile(fileEntry, outputRoot, onProgress) {
+    const outputPath = path.join(outputRoot, fileEntry.filePath)
+
+    await fs.promises.mkdir(path.dirname(outputPath), {
+        recursive: true
+    })
+
+    const hasher = crypto.createHash("sha1")
+    const writeStream = fs.createWriteStream(outputPath)
+
+    let downloadedBytes = 0
+
+    try {
+        await requestWithRedirect(fileEntry.url, (responseStream) => {
+            responseStream.on("data", (chunk) => {
+                downloadedBytes += chunk.length
+                hasher.update(chunk)
+
+                if (onProgress) {
+                    onProgress({
+                        filePath: fileEntry.filePath,
+                        bytesDownloaded: downloadedBytes,
+                        totalBytes: fileEntry.size
+                    })
+                }
+            })
+
+            responseStream.pipe(writeStream)
+        })
+
+        await new Promise((resolve, reject) => {
+            writeStream.on("finish", resolve)
+            writeStream.on("error", reject)
+        })
+
+        const computedSha1 = hasher.digest("hex")
+
+        if (computedSha1 !== fileEntry.sha1) {
+            await fs.promises.unlink(outputPath).catch(() => {})
+            throw new Error(
+                `Hash SHA1 invalide pour ${fileEntry.filePath}. ` +
+                `Attendu: ${fileEntry.sha1}, Obtenu: ${computedSha1}`
+            )
+        }
+
+        if (fileEntry.executable && process.platform !== "win32") {
+            await fs.promises.chmod(outputPath, 0o755).catch(() => {})
+        }
+
+        return {
+            filePath: fileEntry.filePath,
+            outputPath: outputPath,
+            sha1: computedSha1,
+            totalBytes: downloadedBytes
+        }
+
+    } catch (err) {
+        if (!writeStream.destroyed) {
+            writeStream.destroy()
+        }
+        throw err
+    }
+}
+
+async function downloadJavaComponent(manifest, outputRoot, options) {
+    const emitter = new EventEmitter()
+    const concurrency = (options && options.concurrency) || 5
+
+    try {
+        const files = extractDownloadableFiles(manifest)
+        const totalFiles = files.length
+        const totalBytesExpected = files.reduce((sum, f) => { return sum + (f.size || 0) }, 0)
+
+        emitter.emit("start", {
+            totalFiles: totalFiles,
+            totalBytes: totalBytesExpected,
+            outputRoot: outputRoot
+        })
+
+        let completedFiles = 0
+        let failedFiles = 0
+        let totalBytesDownloaded = 0
+        const errors = []
+
+        const perFileProgress = {}
+
+        function reportGlobalProgress() {
+            const currentTotal = Object.keys(perFileProgress).reduce((sum, key) => {
+                return sum + perFileProgress[key]
+            }, 0)
+
+            emitter.emit("progress", {
+                completedFiles: completedFiles,
+                totalFiles: totalFiles,
+                bytesDownloaded: currentTotal,
+                totalBytes: totalBytesExpected,
+                percent: totalBytesExpected > 0 ?
+                    Math.round((currentTotal / totalBytesExpected) * 100) :
+                    null
+            })
+        }
+
+        let cursor = 0
+
+        async function worker() {
+            while (cursor < files.length) {
+                const currentIndex = cursor
+                cursor += 1
+                const fileEntry = files[currentIndex]
+
+                try {
+                    const result = await downloadSingleFile(fileEntry, outputRoot, (progressInfo) => {
+                        perFileProgress[progressInfo.filePath] = progressInfo.bytesDownloaded
+                        reportGlobalProgress()
+                    })
+
+                    completedFiles += 1
+                    totalBytesDownloaded += result.totalBytes
+                    perFileProgress[fileEntry.filePath] = result.totalBytes
+
+                    emitter.emit("fileComplete", result)
+                    reportGlobalProgress()
+
+                } catch (err) {
+                    failedFiles += 1
+                    errors.push({
+                        filePath: fileEntry.filePath,
+                        message: err.message
+                    })
+
+                    emitter.emit("fileError", {
+                        filePath: fileEntry.filePath,
+                        message: err.message,
+                        error: err
+                    })
+                }
+            }
+        }
+
+        const workerCount = Math.min(concurrency, files.length)
+        const workers = []
+
+        for (let i = 0; i < workerCount; i += 1) {
+            workers.push(worker())
+        }
+
+        await Promise.all(workers)
+
+        emitter.emit("complete", {
+            totalFiles: totalFiles,
+            completedFiles: completedFiles,
+            failedFiles: failedFiles,
+            totalBytes: totalBytesDownloaded,
+            errors: errors
+        })
+
+    } catch (err) {
+        emitter.emit("error", {
+            message: err.message,
+            error: err
+        })
+    }
+
+    return emitter
+}
+
+module.exports = {
+    downloadJavaComponent
+}

src/systeminfo.js

@@ -0,0 +1,65 @@
+const fs = require("node:fs")
+const path = require("node:path")
+
+function getPlatformKey() {
+    const platform = process.platform
+    const arch = process.arch
+    let candidate = null
+
+    if (platform === "win32") {
+        if (arch === "arm64") {
+            candidate = "windows-arm64"
+        }
+        else if (arch === "x64") {
+            candidate = "windows-x64"
+        }
+        else if (arch === "ia32") {
+            candidate = "windows-x86"
+        }
+    } else if (platform === "darwin") {
+        if (arch === "arm64") {
+            candidate = "mac-os-arm64"
+        } else {
+            candidate = "mac-os"
+        }
+    } else if (platform === "linux") {
+        if (arch === "ia32") {
+            candidate = "linux-i386"
+        } else {
+            candidate = "linux"
+        }
+    }
+
+    if (candidate) {
+        return candidate
+    }
+
+    return targets["linux"] ?? null
+}
+
+async function determineInstallationPath(component, majorVersion, customInstallPath = null) {
+    if (typeof customInstallPath == "string") {
+        try {
+            await fs.promises.access(customInstallPath)
+            return customInstallPath
+        } catch (error) {
+            await fs.promises.mkdir(customInstallPath, { recursive: true })
+            return customInstallPath
+        }
+    }
+    switch (process.platform) {
+        case "win32":
+            return path.join("Program files", "Java", component, majorVersion)
+        case "linux":
+            return path.join("opt", "java", component, majorVersion)
+        case "macos":
+            return path.join("Library", "Java", "JavaVirtualMachines", `${component}-${majorVersion}`)
+        default:
+            throw new Error("Unsupported OS")
+    }
+}
+
+module.exports = {
+    getPlatformKey,
+    determineInstallationPath
+}

src/web.js

@@ -0,0 +1,40 @@
+const config = require("./config")
+
+async function getVersionManifest(version) {
+    const mainifestRequest = await fetch(config.launcherManifest.get())
+    const manifest = await mainifestRequest.json()
+    const component = manifest.versions.find($version => $version.id == version)
+    if (!typeof component == "object") {
+        throw new Error("Unknown version")
+    }
+    return component.url
+}
+
+async function getRequiredJREFor(versionUrl) {
+    const mainifestRequest = await fetch(versionUrl)
+    const manifest = await mainifestRequest.json()
+    return manifest.javaVersion
+}
+
+async function getJREComponentDetails(componentRequested, os) {
+    const mainifestRequest = await fetch(config.allRuntimes.get())
+    const manifest = await mainifestRequest.json()
+    const component = manifest[os][componentRequested]
+    if (typeof component != "object") {
+        throw new Error("No JRE Component found")
+    }
+    return component
+}
+
+async function getJREComponentManifest(url) {
+    const mainifestRequest = await fetch(url)
+    const manifest = await mainifestRequest.json()
+    return manifest
+}
+
+module.exports = {
+    getVersionManifest,
+    getRequiredJREFor,
+    getJREComponentDetails,
+    getJREComponentManifest
+}

test.js

@@ -0,0 +1,7 @@
+const lib = require("./index")
+
+async function main() {
+    await lib.installJava("jre-legacy", 8, "./java")
+}
+
+main()