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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.
*/
#import "ARDWebSocketChannel.h"
#import "RTCLogging.h"
#import "SRWebSocket.h"
#import "ARDSignalingMessage.h"
#import "ARDUtilities.h"
// TODO(tkchin): move these to a configuration object.
static NSString const *kARDWSSMessageErrorKey = @"error";
static NSString const *kARDWSSMessagePayloadKey = @"msg";
@interface ARDWebSocketChannel () <SRWebSocketDelegate>
@end
@implementation ARDWebSocketChannel {
NSURL *_url;
NSURL *_restURL;
SRWebSocket *_socket;
}
@synthesize delegate = _delegate;
@synthesize state = _state;
@synthesize roomId = _roomId;
@synthesize clientId = _clientId;
- (instancetype)initWithURL:(NSURL *)url
restURL:(NSURL *)restURL
delegate:(id<ARDSignalingChannelDelegate>)delegate {
if (self = [super init]) {
_url = url;
_restURL = restURL;
_delegate = delegate;
_socket = [[SRWebSocket alloc] initWithURL:url];
_socket.delegate = self;
RTCLog(@"Opening WebSocket.");
[_socket open];
}
return self;
}
- (void)dealloc {
[self disconnect];
}
- (void)setState:(ARDSignalingChannelState)state {
if (_state == state) {
return;
}
_state = state;
[_delegate channel:self didChangeState:_state];
}
- (void)registerForRoomId:(NSString *)roomId
clientId:(NSString *)clientId {
NSParameterAssert(roomId.length);
NSParameterAssert(clientId.length);
_roomId = roomId;
_clientId = clientId;
if (_state == kARDSignalingChannelStateOpen) {
[self registerWithCollider];
}
}
- (void)sendMessage:(ARDSignalingMessage *)message {
NSParameterAssert(_clientId.length);
NSParameterAssert(_roomId.length);
NSData *data = [message JSONData];
if (_state == kARDSignalingChannelStateRegistered) {
NSString *payload =
[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSDictionary *message = @{
@"cmd": @"send",
@"msg": payload,
};
NSData *messageJSONObject =
[NSJSONSerialization dataWithJSONObject:message
options:NSJSONWritingPrettyPrinted
error:nil];
NSString *messageString =
[[NSString alloc] initWithData:messageJSONObject
encoding:NSUTF8StringEncoding];
RTCLog(@"C->WSS: %@", messageString);
[_socket send:messageString];
} else {
NSString *dataString =
[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
RTCLog(@"C->WSS POST: %@", dataString);
NSString *urlString =
[NSString stringWithFormat:@"%@/%@/%@",
[_restURL absoluteString], _roomId, _clientId];
NSURL *url = [NSURL URLWithString:urlString];
[NSURLConnection sendAsyncPostToURL:url
withData:data
completionHandler:nil];
}
}
- (void)disconnect {
if (_state == kARDSignalingChannelStateClosed ||
_state == kARDSignalingChannelStateError) {
return;
}
[_socket close];
RTCLog(@"C->WSS DELETE rid:%@ cid:%@", _roomId, _clientId);
NSString *urlString =
[NSString stringWithFormat:@"%@/%@/%@",
[_restURL absoluteString], _roomId, _clientId];
NSURL *url = [NSURL URLWithString:urlString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"DELETE";
request.HTTPBody = nil;
[NSURLConnection sendAsyncRequest:request completionHandler:nil];
}
#pragma mark - SRWebSocketDelegate
- (void)webSocketDidOpen:(SRWebSocket *)webSocket {
RTCLog(@"WebSocket connection opened.");
self.state = kARDSignalingChannelStateOpen;
if (_roomId.length && _clientId.length) {
[self registerWithCollider];
}
}
- (void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message {
NSString *messageString = message;
NSData *messageData = [messageString dataUsingEncoding:NSUTF8StringEncoding];
id jsonObject = [NSJSONSerialization JSONObjectWithData:messageData
options:0
error:nil];
if (![jsonObject isKindOfClass:[NSDictionary class]]) {
RTCLogError(@"Unexpected message: %@", jsonObject);
return;
}
NSDictionary *wssMessage = jsonObject;
NSString *errorString = wssMessage[kARDWSSMessageErrorKey];
if (errorString.length) {
RTCLogError(@"WSS error: %@", errorString);
return;
}
NSString *payload = wssMessage[kARDWSSMessagePayloadKey];
ARDSignalingMessage *signalingMessage =
[ARDSignalingMessage messageFromJSONString:payload];
RTCLog(@"WSS->C: %@", payload);
[_delegate channel:self didReceiveMessage:signalingMessage];
}
- (void)webSocket:(SRWebSocket *)webSocket didFailWithError:(NSError *)error {
RTCLogError(@"WebSocket error: %@", error);
self.state = kARDSignalingChannelStateError;
}
- (void)webSocket:(SRWebSocket *)webSocket
didCloseWithCode:(NSInteger)code
reason:(NSString *)reason
wasClean:(BOOL)wasClean {
RTCLog(@"WebSocket closed with code: %ld reason:%@ wasClean:%d",
(long)code, reason, wasClean);
NSParameterAssert(_state != kARDSignalingChannelStateError);
self.state = kARDSignalingChannelStateClosed;
}
#pragma mark - Private
- (void)registerWithCollider {
if (_state == kARDSignalingChannelStateRegistered) {
return;
}
NSParameterAssert(_roomId.length);
NSParameterAssert(_clientId.length);
NSDictionary *registerMessage = @{
@"cmd": @"register",
@"roomid" : _roomId,
@"clientid" : _clientId,
};
NSData *message =
[NSJSONSerialization dataWithJSONObject:registerMessage
options:NSJSONWritingPrettyPrinted
error:nil];
NSString *messageString =
[[NSString alloc] initWithData:message encoding:NSUTF8StringEncoding];
RTCLog(@"Registering on WSS for rid:%@ cid:%@", _roomId, _clientId);
// Registration can fail if server rejects it. For example, if the room is
// full.
[_socket send:messageString];
self.state = kARDSignalingChannelStateRegistered;
}
@end
@interface ARDLoopbackWebSocketChannel () <ARDSignalingChannelDelegate>
@end
@implementation ARDLoopbackWebSocketChannel
- (instancetype)initWithURL:(NSURL *)url restURL:(NSURL *)restURL {
return [super initWithURL:url restURL:restURL delegate:self];
}
#pragma mark - ARDSignalingChannelDelegate
- (void)channel:(id<ARDSignalingChannel>)channel
didReceiveMessage:(ARDSignalingMessage *)message {
switch (message.type) {
case kARDSignalingMessageTypeOffer: {
// Change message to answer, send back to server.
ARDSessionDescriptionMessage *sdpMessage =
(ARDSessionDescriptionMessage *)message;
RTCSessionDescription *description = sdpMessage.sessionDescription;
NSString *dsc = description.description;
dsc = [dsc stringByReplacingOccurrencesOfString:@"offer"
withString:@"answer"];
RTCSessionDescription *answerDescription =
[[RTCSessionDescription alloc] initWithType:@"answer" sdp:dsc];
ARDSignalingMessage *answer =
[[ARDSessionDescriptionMessage alloc]
initWithDescription:answerDescription];
[self sendMessage:answer];
break;
}
case kARDSignalingMessageTypeAnswer:
// Should not receive answer in loopback scenario.
break;
case kARDSignalingMessageTypeCandidate:
// Send back to server.
[self sendMessage:message];
break;
case kARDSignalingMessageTypeBye:
// Nothing to do.
return;
}
}
- (void)channel:(id<ARDSignalingChannel>)channel
didChangeState:(ARDSignalingChannelState)state {
}
@end
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