Feat: Highly experimental JAR auto update

CONTRIBUTING.md

@@ -161,6 +161,8 @@ discussed above
 - Usually when we add a new fields or modify existing ones in the data classes, like, for example, adding `description`
   field in the `Mod` data class, we will try to update the [Admin](./admin) module too to convert the new
   data from other launchers to make the process easier for administrations
+- The project generate `BuildConfig` object using a Gradle task once you start the application or building it,
+  you might get `Unresolved reference: BuildConfig` which can be solved by either start the application or building it.
 
 ### Development Known Issues 🚧
 

buildSrc/src/main/kotlin/GenerateBuildConfigTask.kt

@@ -0,0 +1,49 @@
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.provider.MapProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.OutputDirectory
+import org.gradle.api.tasks.TaskAction
+import org.gradle.kotlin.dsl.mapProperty
+import org.gradle.kotlin.dsl.property
+
+/**
+ * A task to extract data from the build script into the source code to use it, such as the version of the project.
+ * */
+open class GenerateBuildConfigTask : DefaultTask() {
+    @get:Input
+    val fieldsToGenerate: MapProperty<String, Any> = project.objects.mapProperty()
+
+    @get:Input
+    val classFullyQualifiedName: Property<String> = project.objects.property<String>()
+
+    @get:OutputDirectory
+    val generatedOutputDirectory: DirectoryProperty = project.objects.directoryProperty()
+
+    @TaskAction
+    fun execute() {
+        val directory = generatedOutputDirectory.get().asFile
+        directory.deleteRecursively()
+        directory.mkdirs()
+
+        val packageNameParts = classFullyQualifiedName.get().split(".")
+        val className = packageNameParts.last()
+        val generatedFile = directory.resolve("$className.kt")
+        val generatedFileContent =
+            buildString {
+                if (packageNameParts.size > 1) {
+                    appendLine("package ${packageNameParts.dropLast(1).joinToString(".")}")
+                }
+
+                appendLine()
+                appendLine("// GENERATED FILE, Manual changes will be overwritten")
+                appendLine("object $className {")
+                for ((key, value) in fieldsToGenerate.get().entries.sortedBy { it.key }) {
+                    appendLine("    const val $key = ${if (value is String) "\"$value\"" else value.toString()}")
+                }
+                appendLine("}")
+            }
+        generatedFile.writeText(generatedFileContent)
+    }
+}

common/build.gradle.kts

@@ -22,5 +22,26 @@ tasks.test {
 }
 
 kotlin {
-    jvmToolchain(libs.versions.java.get().toInt())
+    jvmToolchain(
+        libs.versions.java
+            .get()
+            .toInt(),
+    )
+}
+
+val generateBuildConfig =
+    tasks.register<GenerateBuildConfigTask>("generateBuildConfig") {
+        val buildConfigDirectory = project.layout.buildDirectory.dir("generated")
+
+        classFullyQualifiedName.set("generated.BuildConfig")
+        generatedOutputDirectory.set(buildConfigDirectory)
+        fieldsToGenerate.put("PROJECT_VERSION", libs.versions.project.get())
+    }
+
+sourceSets.main.configure {
+    kotlin.srcDirs(generateBuildConfig.flatMap { it.generatedOutputDirectory })
+}
+
+tasks.compileKotlin.configure {
+    dependsOn(generateBuildConfig)
 }

common/src/main/kotlin/constants/ProjectInfoConstants.kt

@@ -7,4 +7,9 @@ object ProjectInfoConstants {
 
     // At the moment, we don't have a website; this will make it easier to provide a link to it later
     const val WEBSITE = REPOSITORY_LINK
+
+    const val LIBS_VERSIONS_TOML_FILE_URL =
+        "https://raw.githubusercontent.com/ellet0/kraft-sync/main/gradle/libs.versions.toml"
+
+    const val LATEST_SYNC_SCRIPT_JAR_FILE_URL = "https://github.com/ellet0/kraft-sync/releases/download/latest/kraft-sync.min.jar"
 }

common/src/main/kotlin/utils/CommandLine.kt

@@ -1,6 +1,7 @@
 package utils
 
 import utils.os.OperatingSystem
+import java.io.File
 import java.util.concurrent.TimeUnit
 
 /**
@@ -74,3 +75,15 @@ fun powerShellCommandLine(
         isLoggingEnabled = isLoggingEnabled,
     )
 }
+
+/**
+ * Launch a bat script file on **Microsoft Windows** in a new window which will **prevent blocking the code execution**
+ * the code execution of the bat script will continue to work even if the application has been closed
+ * @throws IllegalStateException If the current operating system is not [OperatingSystem.Windows]
+ * */
+fun executeBatchScriptInSeparateWindow(batScriptFile: File) {
+    if (!OperatingSystem.current.isWindows()) {
+        throw IllegalStateException("Bat script can be only executed on Windows.")
+    }
+    ProcessBuilder("cmd", "/c", "start", batScriptFile.absolutePath).start()
+}

sync-script/src/main/kotlin/JarAutoUpdater.kt

@@ -0,0 +1,147 @@
+import constants.ProjectInfoConstants
+import constants.SyncScriptInstanceFiles
+import generated.BuildConfig
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import okhttp3.Request
+import utils.FileDownloader
+import utils.HttpService
+import utils.SystemInfoProvider
+import utils.executeAsync
+import utils.executeBatchScriptInSeparateWindow
+import utils.getBodyOrThrow
+import utils.getRunningJarFileAsUrl
+import utils.os.OperatingSystem
+import utils.terminateWithOrWithoutError
+import java.io.File
+
+object JarAutoUpdater {
+    private suspend fun downloadLatestJarFile(): Result<File> =
+        try {
+            val newJarFile =
+                SyncScriptInstanceFiles.SyncScriptData.Temp.file
+                    .resolve("${ProjectInfoConstants.NORMALIZED_NAME}-new.jar")
+            if (newJarFile.exists()) {
+                newJarFile.delete()
+            }
+            FileDownloader(
+                downloadUrl = ProjectInfoConstants.LATEST_SYNC_SCRIPT_JAR_FILE_URL,
+                targetFile = newJarFile,
+                progressListener = { _, _, _ -> },
+            ).downloadFile()
+            Result.success(newJarFile)
+        } catch (e: Exception) {
+            e.printStackTrace()
+            Result.failure(e)
+        }
+
+    private suspend fun getLatestProjectVersion(): Result<String?> =
+        try {
+            val url = ProjectInfoConstants.LIBS_VERSIONS_TOML_FILE_URL
+            println("\uD83D\uDCE5 Sending GET request to: $url")
+            val request =
+                Request
+                    .Builder()
+                    .url(url)
+                    .get()
+                    .build()
+            val response = HttpService.client.newCall(request).executeAsync()
+            val responseBody: String = response.getBodyOrThrow().string()
+
+            val projectVersionRegex = Regex("""project\s*=\s*"(.+?)"""")
+
+            val projectVersion =
+                projectVersionRegex
+                    .find(responseBody)
+                    ?.groups
+                    ?.get(1)
+                    ?.value
+            Result.success(projectVersion)
+        } catch (e: Exception) {
+            e.printStackTrace()
+            Result.failure(e)
+        }
+
+    suspend fun updateIfAvailable() {
+        val currentRunningJarFile =
+            File(
+                getRunningJarFileAsUrl()
+                    .getOrElse {
+                        println("⚠\uFE0F Auto update feature is only supported when running using JAR.")
+                        return
+                    }.file,
+            )
+        val latestProjectVersion =
+            getLatestProjectVersion().getOrElse {
+                println("❌ We couldn't get the latest project version: ${it.message}")
+                return
+            }
+        if (latestProjectVersion == null) {
+            println(
+                "⚠\uFE0F It seems that the project version is missing, it could have been moved somewhere else. " +
+                    "Consider updating manually.",
+            )
+            return
+        }
+        if (latestProjectVersion == BuildConfig.PROJECT_VERSION) {
+            println("✨ You're using the latest version of the project.")
+            return
+        }
+        val newJarFile =
+            downloadLatestJarFile().getOrElse {
+                println("❌ An error occurred while downloading the latest version: ${it.message}")
+                return
+            }
+        println("ℹ\uFE0F The new update has been downloaded, will close the application.")
+        updateApplication(
+            currentRunningJarFile = currentRunningJarFile,
+            newJarFile = newJarFile,
+        )
+    }
+
+    private suspend fun updateApplication(
+        currentRunningJarFile: File,
+        newJarFile: File,
+    ) {
+        when (OperatingSystem.current) {
+            OperatingSystem.Linux, OperatingSystem.MacOS -> {
+                Runtime.getRuntime().addShutdownHook(
+                    Thread {
+                        currentRunningJarFile.delete()
+                        newJarFile.renameTo(currentRunningJarFile)
+                    },
+                )
+            }
+
+            OperatingSystem.Windows -> {
+                // On Windows, we can't rename, delete or modify the current running JAR file due to file locking
+                val updateBatScriptFile =
+                    SyncScriptInstanceFiles.SyncScriptData.Temp.file
+                        .resolve("update.bat")
+                withContext(Dispatchers.IO) {
+                    updateBatScriptFile.parentFile.mkdirs()
+                    updateBatScriptFile.createNewFile()
+                }
+                updateBatScriptFile.writeText(
+                    """
+                    @echo off
+                    echo Waiting for 2 seconds to ensure application closure...
+                    timeout /t 2 > nul
+                    del "${currentRunningJarFile.absolutePath}"
+                    move "${newJarFile.absolutePath}" "${currentRunningJarFile.absolutePath}"
+                    exit
+                    """.trimIndent(),
+                )
+                executeBatchScriptInSeparateWindow(
+                    batScriptFile = updateBatScriptFile,
+                )
+            }
+
+            OperatingSystem.Unknown -> {
+                println("⚠\uFE0F Auto update feature is not supported on ${SystemInfoProvider.getOperatingSystemName()}.")
+            }
+        }
+        // Will require the user to launch once again after the update.
+        terminateWithOrWithoutError()
+    }
+}

sync-script/src/main/kotlin/Main.kt

@@ -3,6 +3,7 @@ import config.data.ScriptConfigDataSource
 import config.models.ScriptConfig
 import constants.Constants
 import constants.SyncScriptInstanceFiles
+import generated.BuildConfig
 import gui.GuiState
 import gui.dialogs.CreateScriptConfigDialog
 import gui.dialogs.QuickPreferencesDialog
@@ -40,6 +41,7 @@ suspend fun main(args: Array<String>) {
 
     passedArgs = args
 
+    println("📋 Current project version: ${BuildConfig.PROJECT_VERSION}")
     println("\uD83D\uDCC1 Current working directory: ${SystemInfoProvider.getCurrentWorkingDirectoryPath()}")
 
     when (OperatingSystem.current) {
@@ -152,6 +154,10 @@ suspend fun main(args: Array<String>) {
         )
     }
 
+    if (scriptConfig.autoUpdateEnabled) {
+        JarAutoUpdater.updateIfAvailable()
+    }
+
     // TODO: Plan if we should implement this in non GUI mode
     if (GuiState.isGuiEnabled &&
         !SyncScriptInstanceFiles.SyncScriptData.IsPreferencesConfigured.file

sync-script/src/main/kotlin/config/models/ScriptConfig.kt

@@ -64,7 +64,22 @@ data class ScriptConfig(
      * then consider passing false to [isGuiEnabledOverride]
      * */
     val environment: Environment = Environment.Client,
-    // TODO: add `autoUpdate` property, plan how it work and add some kind of caching or how often it will update
+    /**
+     * Currently, the auto-update feature is **highly experimental**, and might be removed, or changed at any time.
+     * And for now, this feature has the following known issues:
+     * 1. It will always update even if the next version has **breaking changes**
+     * that can't be automatically migrated.
+     * 2. It will always update even if the next version is not a stable release;
+     * we haven't implemented an update channel for now (e.g., stable, beta, alpha, development, etc...).
+     * 3. Once the update is finished, the application will close with
+     * exit code 1 which will indicate an error by the launcher.
+     * The user will have to launch once again to run the updated JAR.
+     * 4. Currently, it lacks the ability to check for updates, such as on a weekly basis.
+     * 5. Lacks the option to ask if the user wants to update or skip.
+     * 6. At the moment we have minimized JAR and the fat JAR,
+     * the update process will always update to the minimized JAR.
+     * */
+    val autoUpdateEnabled: Boolean = false,
 ) {
     companion object {
         var instance: ScriptConfig? = null

sync-script/src/main/kotlin/utils/JarUtils.kt

@@ -7,7 +7,7 @@ import java.net.URL
  * @throws IllegalStateException if the application is not being run from a JAR file
  * */
 fun getRunningJarFileAsUrl(): Result<URL> {
-    val codeSource = object {}.javaClass.enclosingClass.protectionDomain?.codeSource
+    val codeSource = object {}.javaClass.protectionDomain?.codeSource
     codeSource?.location?.let {
         if (!it.file.endsWith(".jar", ignoreCase = true)) {
             return Result.failure(