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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
)
}
}
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