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166
android/src/main/java/com/chunkeddl/ChunkedDlModule.kt
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package com.chunkeddl | ||
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import android.util.SparseArray | ||
import com.facebook.react.bridge.* | ||
import android.os.AsyncTask | ||
import com.facebook.react.bridge.ReadableMap | ||
import java.io.File | ||
import java.io.FileOutputStream | ||
import java.io.InputStream | ||
import java.io.OutputStream | ||
import java.net.HttpURLConnection | ||
import java.net.URL | ||
import java.nio.file.Files | ||
import java.util.concurrent.atomic.AtomicBoolean | ||
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class ChunkedDlModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) { | ||
class DownloadResult { | ||
var statusCode = 0 | ||
var bytesWritten: Long = 0 | ||
var exception: Exception? = null | ||
} | ||
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class DownloadParams { | ||
interface OnTaskCompleted { | ||
fun onTaskCompleted(res: DownloadResult?) | ||
} | ||
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var url: String? = null | ||
var toFile: String? = null | ||
var headers: ReadableMap? = null | ||
var chunkSize: Int = 0 | ||
var contentLength: Int = 0 | ||
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private val downloaders: SparseArray<Downloader> = SparseArray() | ||
var onTaskCompleted: OnTaskCompleted? = null | ||
} | ||
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open class Downloader : AsyncTask<DownloadParams, LongArray, DownloadResult>() { | ||
private var params: DownloadParams = DownloadParams() | ||
private var res: DownloadResult = DownloadResult() | ||
private val abort: AtomicBoolean = AtomicBoolean(false) | ||
private var conn: HttpURLConnection? = null | ||
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override fun getName(): String { | ||
return NAME | ||
override fun doInBackground(vararg args: DownloadParams?): DownloadResult? { | ||
res = DownloadResult() | ||
if(args[0] == null) { | ||
res.exception = Exception("Invalid params") | ||
return res | ||
} | ||
params = args[0]!! | ||
Thread { | ||
try { | ||
download(this.params, res) | ||
this.params.onTaskCompleted?.onTaskCompleted(res) | ||
} catch (ex: java.lang.Exception) { | ||
res.exception = ex | ||
this.params.onTaskCompleted?.onTaskCompleted(res) | ||
} | ||
}.start() | ||
return res | ||
} | ||
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@ReactMethod | ||
fun download(options: ReadableMap, promise: Promise) { | ||
try { | ||
val jobId = options.getInt("jobId") | ||
val params = DownloadParams() | ||
params.url = options.getString("url") | ||
params.toFile = options.getString("toFile")?.replace("file://", "") | ||
params.headers = options.getMap("headers") | ||
params.contentLength = options.getInt("contentLength") | ||
params.chunkSize = options.getInt("chunkSize") | ||
params.onTaskCompleted = object : DownloadParams.OnTaskCompleted { | ||
override fun onTaskCompleted(res: DownloadResult?) { | ||
if (res!!.exception == null) { | ||
val infoMap = Arguments.createMap() | ||
infoMap.putInt("jobId", jobId) | ||
infoMap.putInt("statusCode", res.statusCode) | ||
infoMap.putDouble("bytesWritten", res.bytesWritten.toDouble()) | ||
promise.resolve(infoMap) | ||
} else { | ||
promise.reject(options.getString("toFile"), res.exception) | ||
} | ||
private fun download(param: DownloadParams, res: DownloadResult) { | ||
var start = 0 | ||
var end = if (params.chunkSize <= 0) 1024 * 1024 * 10 else params.chunkSize | ||
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var file = File(params.toFile) | ||
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var inputStream : InputStream | ||
var outputStream : OutputStream = FileOutputStream(file) | ||
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fun getNextChunk() { | ||
if (abort.get()) | ||
throw Exception("Download has been aborted") | ||
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if (end >= params.contentLength){ | ||
end = params.contentLength | ||
} | ||
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val isFinalChunk = end >= params.contentLength | ||
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val url = URL("${params.url}&range=${start}-${end}") | ||
conn = url.openConnection() as HttpURLConnection | ||
conn!!.requestMethod = "GET" | ||
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if(params.headers != null) { | ||
for (header in params.headers!!.entryIterator) | ||
conn!!.setRequestProperty(header.key, header.value as String) | ||
} | ||
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if (conn!!.responseCode == HttpURLConnection.HTTP_OK) { | ||
if (abort.get()) | ||
throw Exception("Download has been aborted") | ||
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res.statusCode = conn!!.responseCode; | ||
inputStream = conn!!.inputStream | ||
if (!file.exists()) { | ||
throw Exception("File does not exists"); | ||
} | ||
res.bytesWritten = conn!!.contentLength.toLong(); | ||
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val bufferSize = 8 * 1024 // set the buffer size to 8 KB | ||
val buffer = ByteArray(bufferSize) | ||
var bytesRead = inputStream.read(buffer) | ||
while (bytesRead != -1) { | ||
outputStream.write(buffer, 0, bytesRead) | ||
bytesRead = inputStream.read(buffer) | ||
} | ||
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outputStream.flush() | ||
inputStream.close() | ||
} else { | ||
if (abort.get()) | ||
throw Exception("Download has been aborted") | ||
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res.statusCode = conn!!.responseCode; | ||
throw Exception("HTTP Error: ${conn!!.responseCode} ${conn!!.responseMessage}"); | ||
} | ||
val downloader = Downloader() | ||
downloader.execute(params) | ||
this.downloaders.put(jobId, downloader) | ||
} catch (ex: Exception) { | ||
ex.printStackTrace() | ||
promise.reject(options.getString("toFile"), ex) | ||
} | ||
} | ||
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@ReactMethod | ||
fun stopDownload(jobId: Int) { | ||
val downloader: Downloader = this.downloaders.get(jobId) | ||
if (downloader != null) { | ||
downloader.stop() | ||
conn!!.disconnect() | ||
conn = null | ||
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if(!isFinalChunk) { | ||
start = end + 1 | ||
end += params.chunkSize | ||
getNextChunk() | ||
return | ||
} | ||
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outputStream.close() | ||
} | ||
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getNextChunk() | ||
} | ||
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companion object { | ||
const val NAME = "ChunkedDl" | ||
fun stop() { | ||
abort.set(true) | ||
conn?.disconnect() | ||
try { | ||
File(params.toFile).delete() | ||
} catch (ex: Exception) {} | ||
} | ||
} |