Support 1.19.

app/assets/js/processbuilder.js

@@ -709,6 +709,7 @@ class ProcessBuilder {
      * @returns {{[id: string]: string}} An object containing the paths of each library mojang declares.
      */
     _resolveMojangLibraries(tempNativePath){
+        const nativesRegex = /.+:natives-([^-]+)(?:-(.+))?/
         const libs = {}
 
         const libArr = this.versionData.libraries
@@ -716,13 +717,9 @@ class ProcessBuilder {
         for(let i=0; i<libArr.length; i++){
             const lib = libArr[i]
             if(Library.validateRules(lib.rules, lib.natives)){
-                if(lib.natives == null){
+
-                    const dlInfo = lib.downloads
+                // Pre-1.19 has a natives object.
-                    const artifact = dlInfo.artifact
+                if(lib.natives != null) {
-                    const to = path.join(this.libPath, artifact.path)
-                    const versionIndependentId = lib.name.substring(0, lib.name.lastIndexOf(':'))
-                    libs[versionIndependentId] = to
-                } else {
                     // Extract the native library.
                     const exclusionArr = lib.extract != null ? lib.extract.exclude : ['META-INF/']
                     const artifact = lib.downloads.classifiers[lib.natives[Library.mojangFriendlyOS()].replace('${arch}', process.arch.replace('x', ''))]
@@ -757,6 +754,65 @@ class ProcessBuilder {
 
                     }
                 }
+                // 1.19+ logic
+                else if(lib.name.includes('natives-')) {
+
+                    const regexTest = nativesRegex.exec(lib.name)
+                    // const os = regexTest[1]
+                    const arch = regexTest[2] ?? 'x64'
+
+                    if(arch != process.arch) {
+                        continue
+                    }
+
+                    // Extract the native library.
+                    const exclusionArr = lib.extract != null ? lib.extract.exclude : ['META-INF/', '.git', '.sha1']
+                    const artifact = lib.downloads.artifact
+
+                    // Location of native zip.
+                    const to = path.join(this.libPath, artifact.path)
+
+                    let zip = new AdmZip(to)
+                    let zipEntries = zip.getEntries()
+
+                    // Unzip the native zip.
+                    for(let i=0; i<zipEntries.length; i++){
+                        if(zipEntries[i].isDirectory) {
+                            continue
+                        }
+
+                        const fileName = zipEntries[i].entryName
+
+                        let shouldExclude = false
+
+                        // Exclude noted files.
+                        exclusionArr.forEach(function(exclusion){
+                            if(fileName.indexOf(exclusion) > -1){
+                                shouldExclude = true
+                            }
+                        })
+
+                        const extractName = fileName.includes('/') ? fileName.substring(fileName.lastIndexOf('/')) : fileName
+
+                        // Extract the file.
+                        if(!shouldExclude){
+                            fs.writeFile(path.join(tempNativePath, extractName), zipEntries[i].getData(), (err) => {
+                                if(err){
+                                    logger.error('Error while extracting native library:', err)
+                                }
+                            })
+                        }
+
+                    }
+                }
+                // No natives
+                else {
+                    const dlInfo = lib.downloads
+                    const artifact = dlInfo.artifact
+                    const to = path.join(this.libPath, artifact.path)
+                    const versionIndependentId = lib.name.substring(0, lib.name.lastIndexOf(':'))
+                    libs[versionIndependentId] = to
+                }
             }
         }