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/*
* Copyright 2014 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
package org.appspot.apprtc;
import android.util.Log;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.List;
import org.appspot.apprtc.AppRTCClient.SignalingParameters;
import org.appspot.apprtc.util.AsyncHttpURLConnection;
import org.appspot.apprtc.util.AsyncHttpURLConnection.AsyncHttpEvents;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.webrtc.IceCandidate;
import org.webrtc.PeerConnection;
import org.webrtc.SessionDescription;
/**
* AsyncTask that converts an AppRTC room URL into the set of signaling
* parameters to use with that room.
*/
public class RoomParametersFetcher {
private static final String TAG = "RoomRTCClient";
private static final int TURN_HTTP_TIMEOUT_MS = 5000;
private final RoomParametersFetcherEvents events;
private final String roomUrl;
private final String roomMessage;
/**
* Room parameters fetcher callbacks.
*/
public interface RoomParametersFetcherEvents {
/**
* Callback fired once the room's signaling parameters
* SignalingParameters are extracted.
*/
void onSignalingParametersReady(final SignalingParameters params);
/**
* Callback for room parameters extraction error.
*/
void onSignalingParametersError(final String description);
}
public RoomParametersFetcher(
String roomUrl, String roomMessage, final RoomParametersFetcherEvents events) {
this.roomUrl = roomUrl;
this.roomMessage = roomMessage;
this.events = events;
}
public void makeRequest() {
Log.d(TAG, "Connecting to room: " + roomUrl);
AsyncHttpURLConnection httpConnection =
new AsyncHttpURLConnection("POST", roomUrl, roomMessage, new AsyncHttpEvents() {
@Override
public void onHttpError(String errorMessage) {
Log.e(TAG, "Room connection error: " + errorMessage);
events.onSignalingParametersError(errorMessage);
}
@Override
public void onHttpComplete(String response) {
roomHttpResponseParse(response);
}
});
httpConnection.send();
}
private void roomHttpResponseParse(String response) {
Log.d(TAG, "Room response: " + response);
try {
List<IceCandidate> iceCandidates = null;
SessionDescription offerSdp = null;
JSONObject roomJson = new JSONObject(response);
String result = roomJson.getString("result");
if (!result.equals("SUCCESS")) {
events.onSignalingParametersError("Room response error: " + result);
return;
}
response = roomJson.getString("params");
roomJson = new JSONObject(response);
String roomId = roomJson.getString("room_id");
String clientId = roomJson.getString("client_id");
String wssUrl = roomJson.getString("wss_url");
String wssPostUrl = roomJson.getString("wss_post_url");
boolean initiator = (roomJson.getBoolean("is_initiator"));
if (!initiator) {
iceCandidates = new ArrayList<>();
String messagesString = roomJson.getString("messages");
JSONArray messages = new JSONArray(messagesString);
for (int i = 0; i < messages.length(); ++i) {
String messageString = messages.getString(i);
JSONObject message = new JSONObject(messageString);
String messageType = message.getString("type");
Log.d(TAG, "GAE->C #" + i + " : " + messageString);
if (messageType.equals("offer")) {
offerSdp = new SessionDescription(
SessionDescription.Type.fromCanonicalForm(messageType), message.getString("sdp"));
} else if (messageType.equals("candidate")) {
IceCandidate candidate = new IceCandidate(
message.getString("id"), message.getInt("label"), message.getString("candidate"));
iceCandidates.add(candidate);
} else {
Log.e(TAG, "Unknown message: " + messageString);
}
}
}
Log.d(TAG, "RoomId: " + roomId + ". ClientId: " + clientId);
Log.d(TAG, "Initiator: " + initiator);
Log.d(TAG, "WSS url: " + wssUrl);
Log.d(TAG, "WSS POST url: " + wssPostUrl);
List<PeerConnection.IceServer> iceServers =
iceServersFromPCConfigJSON(roomJson.getString("pc_config"));
boolean isTurnPresent = false;
for (PeerConnection.IceServer server : iceServers) {
Log.d(TAG, "IceServer: " + server);
for (String uri : server.urls) {
if (uri.startsWith("turn:")) {
isTurnPresent = true;
break;
}
}
}
// Request TURN servers.
if (!isTurnPresent && !roomJson.optString("ice_server_url").isEmpty()) {
List<PeerConnection.IceServer> turnServers =
requestTurnServers(roomJson.getString("ice_server_url"));
for (PeerConnection.IceServer turnServer : turnServers) {
Log.d(TAG, "TurnServer: " + turnServer);
iceServers.add(turnServer);
}
}
SignalingParameters params = new SignalingParameters(
iceServers, initiator, clientId, wssUrl, wssPostUrl, offerSdp, iceCandidates);
events.onSignalingParametersReady(params);
} catch (JSONException e) {
events.onSignalingParametersError("Room JSON parsing error: " + e.toString());
} catch (IOException e) {
events.onSignalingParametersError("Room IO error: " + e.toString());
}
}
// Requests & returns a TURN ICE Server based on a request URL. Must be run
// off the main thread!
@SuppressWarnings("UseNetworkAnnotations")
private List<PeerConnection.IceServer> requestTurnServers(String url)
throws IOException, JSONException {
List<PeerConnection.IceServer> turnServers = new ArrayList<>();
Log.d(TAG, "Request TURN from: " + url);
HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
connection.setDoOutput(true);
connection.setConnectTimeout(TURN_HTTP_TIMEOUT_MS);
connection.setReadTimeout(TURN_HTTP_TIMEOUT_MS);
int responseCode = connection.getResponseCode();
if (responseCode != 200) {
throw new IOException("Non-200 response when requesting TURN server from " + url + " : "
+ connection.getHeaderField(null));
}
InputStream responseStream = connection.getInputStream();
String response = drainStream(responseStream);
connection.disconnect();
Log.d(TAG, "TURN response: " + response);
JSONObject responseJSON = new JSONObject(response);
JSONArray iceServers = responseJSON.getJSONArray("iceServers");
for (int i = 0; i < iceServers.length(); ++i) {
JSONObject server = iceServers.getJSONObject(i);
JSONArray turnUrls = server.getJSONArray("urls");
String username = server.has("username") ? server.getString("username") : "";
String credential = server.has("credential") ? server.getString("credential") : "";
for (int j = 0; j < turnUrls.length(); j++) {
String turnUrl = turnUrls.getString(j);
PeerConnection.IceServer turnServer =
PeerConnection.IceServer.builder(turnUrl)
.setUsername(username)
.setPassword(credential)
.createIceServer();
turnServers.add(turnServer);
}
}
return turnServers;
}
// Return the list of ICE servers described by a WebRTCPeerConnection
// configuration string.
private List<PeerConnection.IceServer> iceServersFromPCConfigJSON(String pcConfig)
throws JSONException {
JSONObject json = new JSONObject(pcConfig);
JSONArray servers = json.getJSONArray("iceServers");
List<PeerConnection.IceServer> ret = new ArrayList<>();
for (int i = 0; i < servers.length(); ++i) {
JSONObject server = servers.getJSONObject(i);
String url = server.getString("urls");
String credential = server.has("credential") ? server.getString("credential") : "";
PeerConnection.IceServer turnServer =
PeerConnection.IceServer.builder(url)
.setPassword(credential)
.createIceServer();
ret.add(turnServer);
}
return ret;
}
// Return the contents of an InputStream as a String.
private static String drainStream(InputStream in) {
Scanner s = new Scanner(in, "UTF-8").useDelimiter("\\A");
return s.hasNext() ? s.next() : "";
}
}