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PluginManager.kt
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PluginManager.kt
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package lavalink.server.bootstrap
import org.slf4j.Logger
import org.slf4j.LoggerFactory
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.core.io.support.PathMatchingResourcePatternResolver
import java.io.File
import java.io.FileOutputStream
import java.io.InputStream
import java.net.URL
import java.net.URLClassLoader
import java.nio.channels.Channels
import java.util.*
import java.util.jar.JarFile
@SpringBootApplication
class PluginManager(val config: PluginsConfig) {
companion object {
private val log: Logger = LoggerFactory.getLogger(PluginManager::class.java)
}
final val pluginManifests: MutableList<PluginManifest> = mutableListOf()
init {
manageDownloads()
pluginManifests.apply {
addAll(readClasspathManifests())
addAll(loadJars())
}
}
private fun manageDownloads() {
if (config.plugins.isEmpty()) return
val directory = File(config.pluginsDir)
directory.mkdir()
val pluginJars = directory.listFiles()?.filter { it.extension == "jar" }
?.flatMap { file ->
JarFile(file).use { jar ->
loadPluginManifests(jar).map { manifest -> PluginJar(manifest, file) }
}
}
?.onEach { log.info("Found plugin '${it.manifest.name}' version ${it.manifest.version}") }
?: return
val declarations = config.plugins.map { declaration ->
if (declaration.dependency == null) throw RuntimeException("Illegal dependency declaration: null")
val fragments = declaration.dependency!!.split(":")
if (fragments.size != 3) throw RuntimeException("Invalid dependency \"${declaration.dependency}\"")
val repository = declaration.repository
?: config.defaultPluginSnapshotRepository.takeIf { declaration.snapshot }
?: config.defaultPluginRepository
Declaration(fragments[0], fragments[1], fragments[2], "${repository.removeSuffix("/")}/")
}.distinctBy { "${it.group}:${it.name}" }
for (declaration in declarations) {
val jars = pluginJars.filter { it.manifest.name == declaration.name }
var hasCurrentVersion = false
for (jar in jars) {
if (jar.manifest.version == declaration.version) {
hasCurrentVersion = true
// Don't clean up the jar if it's a current version.
continue
}
// Delete versions of the plugin that aren't the same as declared version.
if (!jar.file.delete()) throw RuntimeException("Failed to delete ${jar.file.path}")
log.info("Deleted ${jar.file.path} (new version: ${declaration.version})")
}
if (!hasCurrentVersion) {
val url = declaration.url
val file = File(directory, declaration.canonicalJarName)
downloadJar(file, url)
}
}
}
private fun downloadJar(output: File, url: String) {
log.info("Downloading $url")
Channels.newChannel(URL(url).openStream()).use {
FileOutputStream(output).channel.transferFrom(it, 0, Long.MAX_VALUE)
}
}
private fun readClasspathManifests(): List<PluginManifest> {
return PathMatchingResourcePatternResolver()
.getResources("classpath*:lavalink-plugins/*.properties")
.map { parsePluginManifest(it.inputStream) }
.onEach { log.info("Found plugin '${it.name}' version ${it.version}") }
}
private fun loadJars(): List<PluginManifest> {
val directory = File(config.pluginsDir).takeIf { it.isDirectory }
?: return emptyList()
val jarsToLoad = directory.listFiles()?.filter { it.isFile && it.extension == "jar" }
?.takeIf { it.isNotEmpty() }
?: return emptyList()
val classLoader = URLClassLoader.newInstance(
jarsToLoad.map { URL("jar:file:${it.absolutePath}!/") }.toTypedArray(),
javaClass.classLoader
)
return jarsToLoad.flatMap { loadJar(it, classLoader) }
}
private fun loadJar(file: File, cl: URLClassLoader): List<PluginManifest> {
val jar = JarFile(file)
val manifests = loadPluginManifests(jar)
var classCount = 0
jar.use {
if (manifests.isEmpty()) {
throw RuntimeException("No plugin manifest found in ${file.path}")
}
val allowedPaths = manifests.map { manifest -> manifest.path.replace(".", "/") }
for (entry in it.entries()) {
if (entry.isDirectory ||
!entry.name.endsWith(".class") ||
allowedPaths.none(entry.name::startsWith)) continue
cl.loadClass(entry.name.dropLast(6).replace("/", "."))
classCount++
}
}
log.info("Loaded ${file.name} ($classCount classes)")
return manifests
}
private fun loadPluginManifests(jar: JarFile): List<PluginManifest> {
return jar.entries().asSequence()
.filter { !it.isDirectory && it.name.startsWith("lavalink-plugins/") && it.name.endsWith(".properties") }
.map { parsePluginManifest(jar.getInputStream(it)) }
.toList()
}
private fun parsePluginManifest(stream: InputStream): PluginManifest {
val props = stream.use {
Properties().apply { load(it) }
}
val name = props.getProperty("name") ?: throw RuntimeException("Manifest is missing 'name'")
val path = props.getProperty("path") ?: throw RuntimeException("Manifest is missing 'path'")
val version = props.getProperty("version") ?: throw RuntimeException("Manifest is missing 'version'")
return PluginManifest(name, path, version)
}
private data class PluginJar(val manifest: PluginManifest, val file: File)
private data class Declaration(val group: String, val name: String, val version: String, val repository: String) {
val canonicalJarName = "$name-$version.jar"
val url = "$repository${group.replace(".", "/")}/$name/$version/$name-$version.jar"
}
}