1 files changed, 74 insertions, 0 deletions
diff --git a/plugin/src/main/kotlin/moe/nea/archenemy/mojang/DownloadAssets.kt b/plugin/src/main/kotlin/moe/nea/archenemy/mojang/DownloadAssets.kt
new file mode 100644
index 0000000..335ac30
--- /dev/null
+++ b/plugin/src/main/kotlin/moe/nea/archenemy/mojang/DownloadAssets.kt
@@ -0,0 +1,74 @@
+package moe.nea.archenemy.mojang
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.decodeFromStream
+import moe.nea.archenemy.util.DownloadUtils
+import moe.nea.archenemy.util.sharedExtension
+import org.gradle.api.DefaultTask
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.Internal
+import org.gradle.api.tasks.TaskAction
+import java.net.URL
+import javax.inject.Inject
+
+abstract class DownloadAssets @Inject constructor(
+    @get:Input
+    val version: String
+) : DefaultTask() {
+
+
+    init {
+        dependsOn(project.sharedExtension.getDownloadVersionMetadataTask(version))
+    }
+
+    @Serializable
+    data class AssetIndexList(
+        val objects: Map<String, AssetIndexFile>
+    )
+
+    @Serializable
+    data class AssetIndexFile(
+        val hash: String,
+        val size: Long,
+    )
+
+    @Internal
+    fun getAssetDir() =
+        project.sharedExtension
+            .getGlobalCacheDirectory()
+            .resolve("assets")
+
+    @Internal
+    fun getAssetIndex() =
+        project.sharedExtension
+            .getDownloadVersionMetadataTask(version)
+            .getVersionMetadataNow()
+            .assetIndex
+
+    @TaskAction
+    fun execute() {
+        val manifest =
+            project.sharedExtension
+                .getDownloadVersionMetadataTask(version)
+                .getVersionMetadata()
+        val indexFile = getAssetDir()
+            .resolve("indexes")
+            .resolve(manifest.assetIndex.id + ".json")
+        DownloadUtils.downloadFile(URL(manifest.assetIndex.url), manifest.assetIndex.sha1, indexFile)
+        val assetIndexList: AssetIndexList = indexFile.inputStream().use(Json::decodeFromStream)
+        for ((path, entry) in assetIndexList.objects) {
+            downloadAsset(entry)
+        }
+    }
+
+    private fun downloadAsset(entry: AssetIndexFile) {
+        val prefix = entry.hash.substring(0, 2)
+        val file = getAssetDir().resolve("objects").resolve(prefix).resolve(entry.hash)
+        DownloadUtils.downloadFile(
+            URL("https://resources.download.minecraft.net/$prefix/${entry.hash}"),
+            entry.hash,
+            file
+        )
+    }
+}
+\ No newline at end of file