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import org.gradle.api.DefaultTask
import org.gradle.api.file.DirectoryProperty
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 java.io.InputStream
import java.net.URI
abstract class DownloadArchiveFile<T : InputStream> : DefaultTask() {
@get:Input
abstract val url: Property<URI>
@get:Input
abstract val stripRoot: Property<Boolean>
@get:Input
abstract val subDirectory: Property<String>
@get:OutputDirectory
abstract val outputDir: DirectoryProperty
init {
subDirectory.convention("")
stripRoot.convention(false)
}
fun url(string: String) {
url.set(URI.create(string))
}
abstract fun mapInputStream(inputStream: InputStream): T
abstract fun nextEntry(stream: T): String?
@TaskAction
fun execute() {
val baseFolder = outputDir.get().asFile
baseFolder.deleteRecursively()
baseFolder.mkdirs()
val pathFilter = this.subDirectory.get()
require(pathFilter.isEmpty() || pathFilter.endsWith("/")) {
"subdirectory '$pathFilter' does not end with a /"
}
url.get().toURL().openStream().buffered().use { input ->
val mappedStream = mapInputStream(input)
while (true) {
val entry = nextEntry(mappedStream) ?: break
var name = entry
if (name.endsWith("/")) continue
if (stripRoot.get()) {
name = name.substringAfter("/")
}
if (pathFilter.isNotEmpty()) {
if (!name.startsWith(pathFilter)) {
continue
} else {
name = name.substring(pathFilter.length)
}
}
val fileLocation = baseFolder.resolve(name).absoluteFile
if (baseFolder !in generateSequence(fileLocation) { it.parentFile }) {
error("File escaping output jail: $name")
}
fileLocation.parentFile.mkdirs()
fileLocation.outputStream().use { output ->
mappedStream.copyTo(output)
}
}
}
}
}
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