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//
// Copyright 2012 Square Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#import "RCTSRWebSocket.h"

#import <Availability.h>
#import <Endian.h>

#import <Security/SecRandom.h>

#import <CommonCrypto/CommonDigest.h>
#import <React/RCTAssert.h>
#import <React/RCTLog.h>

typedef NS_ENUM(NSInteger, RCTSROpCode) {
RCTSROpCodeTextFrame = 0x1,
RCTSROpCodeBinaryFrame = 0x2,
// 3-7 reserved.
RCTSROpCodeConnectionClose = 0x8,
RCTSROpCodePing = 0x9,
RCTSROpCodePong = 0xA,
// B-F reserved.
};

typedef struct {
BOOL fin;
// BOOL rsv1;
// BOOL rsv2;
// BOOL rsv3;
uint8_t opcode;
BOOL masked;
uint64_t payload_length;
} frame_header;

static NSString *const RCTSRWebSocketAppendToSecKeyString = @"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";

//#define RCTSR_ENABLE_LOG
#ifdef RCTSR_ENABLE_LOG
#define RCTSRLog(format...) RCTLogInfo(format)
#else
#define RCTSRLog(...) do { } while (0)
#endif

// This is a hack, and probably not optimal
static inline int32_t validate_dispatch_data_partial_string(NSData *data)
{
static const int maxCodepointSize = 3;

for (int i = 0; i < maxCodepointSize; i++) {
NSString *str = [[NSString alloc] initWithBytesNoCopy:(char *)data.bytes length:data.length - i encoding:NSUTF8StringEncoding freeWhenDone:NO];
if (str) {
return (int32_t)data.length - i;
}
}

return -1;
}

@interface NSData (RCTSRWebSocket)

@property (nonatomic, readonly, copy) NSString *stringBySHA1ThenBase64Encoding;

@end

@interface NSString (RCTSRWebSocket)

@property (nonatomic, readonly, copy) NSString *stringBySHA1ThenBase64Encoding;

@end

@interface NSURL (RCTSRWebSocket)

// The origin isn't really applicable for a native application.
// So instead, just map ws -> http and wss -> https.
@property (nonatomic, readonly, copy) NSString *RCTSR_origin;

@end

@interface _RCTSRRunLoopThread : NSThread

@property (nonatomic, readonly) NSRunLoop *runLoop;

@end

static NSString *newSHA1String(const char *bytes, size_t length)
{
uint8_t md[CC_SHA1_DIGEST_LENGTH];

assert(length >= 0);
assert(length <= UINT32_MAX);
CC_SHA1(bytes, (CC_LONG)length, md);

NSData *data = [NSData dataWithBytes:md length:CC_SHA1_DIGEST_LENGTH];
return [data base64EncodedStringWithOptions:0];
}

@implementation NSData (RCTSRWebSocket)

- (NSString *)stringBySHA1ThenBase64Encoding;
{
return newSHA1String(self.bytes, self.length);
}

@end

@implementation NSString (RCTSRWebSocket)

- (NSString *)stringBySHA1ThenBase64Encoding;
{
return newSHA1String(self.UTF8String, self.length);
}

@end

NSString *const RCTSRWebSocketErrorDomain = @"RCTSRWebSocketErrorDomain";
NSString *const RCTSRHTTPResponseErrorKey = @"HTTPResponseStatusCode";

// Returns number of bytes consumed. Returning 0 means you didn't match.
// Sends bytes to callback handler;
typedef size_t (^stream_scanner)(NSData *collected_data);

typedef void (^data_callback)(RCTSRWebSocket *webSocket, NSData *data);

@interface RCTSRIOConsumer : NSObject

@property (nonatomic, copy, readonly) stream_scanner consumer;
@property (nonatomic, copy, readonly) data_callback handler;
@property (nonatomic, assign) size_t bytesNeeded;
@property (nonatomic, assign, readonly) BOOL readToCurrentFrame;
@property (nonatomic, assign, readonly) BOOL unmaskBytes;

@end

// This class is not thread-safe, and is expected to always be run on the same queue.
@interface RCTSRIOConsumerPool : NSObject

- (instancetype)initWithBufferCapacity:(NSUInteger)poolSize NS_DESIGNATED_INITIALIZER;

- (RCTSRIOConsumer *)consumerWithScanner:(stream_scanner)scanner handler:(data_callback)handler bytesNeeded:(size_t)bytesNeeded readToCurrentFrame:(BOOL)readToCurrentFrame unmaskBytes:(BOOL)unmaskBytes;
- (void)returnConsumer:(RCTSRIOConsumer *)consumer;

@end

@interface RCTSRWebSocket () <NSStreamDelegate>

@property (nonatomic, assign) RCTSRReadyState readyState;

@property (nonatomic, strong) NSOperationQueue *delegateOperationQueue;
@property (nonatomic, strong) dispatch_queue_t delegateDispatchQueue;

@end

@implementation RCTSRWebSocket
{
NSInteger _webSocketVersion;

NSOperationQueue *_delegateOperationQueue;
dispatch_queue_t _delegateDispatchQueue;

dispatch_queue_t _workQueue;
NSMutableArray<RCTSRIOConsumer *> *_consumers;

NSInputStream *_inputStream;
NSOutputStream *_outputStream;

NSMutableData *_readBuffer;
NSUInteger _readBufferOffset;

NSMutableData *_outputBuffer;
NSUInteger _outputBufferOffset;

uint8_t _currentFrameOpcode;
size_t _currentFrameCount;
size_t _readOpCount;
uint32_t _currentStringScanPosition;
NSMutableData *_currentFrameData;

NSString *_closeReason;

NSString *_secKey;

BOOL _pinnedCertFound;

uint8_t _currentReadMaskKey[4];
size_t _currentReadMaskOffset;

BOOL _consumerStopped;

BOOL _closeWhenFinishedWriting;
BOOL _failed;

BOOL _secure;
NSURLRequest *_urlRequest;

CFHTTPMessageRef _receivedHTTPHeaders;

BOOL _sentClose;
BOOL _didFail;
int _closeCode;

BOOL _isPumping;

BOOL _cleanupScheduled;

NSMutableSet<NSArray *> *_scheduledRunloops;

// We use this to retain ourselves.
__strong RCTSRWebSocket *_selfRetain;

NSArray<NSString *> *_requestedProtocols;
RCTSRIOConsumerPool *_consumerPool;
}

- (instancetype)initWithURLRequest:(NSURLRequest *)request protocols:(NSArray<NSString *> *)protocols
{
RCTAssertParam(request);

if ((self = [super init])) {
_url = request.URL;
_urlRequest = request;

_requestedProtocols = [protocols copy];

[self _RCTSR_commonInit];
}
return self;
}

RCT_NOT_IMPLEMENTED(- (instancetype)init)

- (instancetype)initWithURLRequest:(NSURLRequest *)request;
{
return [self initWithURLRequest:request protocols:nil];
}

- (instancetype)initWithURL:(NSURL *)URL;
{
return [self initWithURL:URL protocols:nil];
}

- (instancetype)initWithURL:(NSURL *)URL protocols:(NSArray<NSString *> *)protocols;
{
NSMutableURLRequest *request;
if (URL) {
// Build a mutable request so we can fill the cookie header.
request = [NSMutableURLRequest requestWithURL:URL];

// We load cookies from sharedHTTPCookieStorage (shared with XHR and
// fetch). To get HTTPS-only cookies for wss URLs, replace wss with https
// in the URL.
NSURLComponents *components = [NSURLComponents componentsWithURL:URL resolvingAgainstBaseURL:true];
if ([components.scheme isEqualToString:@"wss"]) {
components.scheme = @"https";
}

// Load and set the cookie header.
NSArray<NSHTTPCookie *> *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:components.URL];
[request setAllHTTPHeaderFields:[NSHTTPCookie requestHeaderFieldsWithCookies:cookies]];
}
return [self initWithURLRequest:request protocols:protocols];
}

- (void)_RCTSR_commonInit;
{
NSString *scheme = _url.scheme.lowercaseString;
assert([scheme isEqualToString:@"ws"] || [scheme isEqualToString:@"http"] || [scheme isEqualToString:@"wss"] || [scheme isEqualToString:@"https"]);

if ([scheme isEqualToString:@"wss"] || [scheme isEqualToString:@"https"]) {
_secure = YES;
}

_readyState = RCTSR_CONNECTING;
_consumerStopped = YES;
_webSocketVersion = 13;

_workQueue = dispatch_queue_create("com.facebook.react.SRWebSocket", DISPATCH_QUEUE_SERIAL);

// Going to set a specific on the queue so we can validate we're on the work queue
dispatch_queue_set_specific(_workQueue, (__bridge void *)self, (__bridge void *)_workQueue, NULL);

_delegateDispatchQueue = dispatch_get_main_queue();

_readBuffer = [NSMutableData new];
_outputBuffer = [NSMutableData new];

_currentFrameData = [NSMutableData new];

_consumers = [NSMutableArray new];

_consumerPool = [RCTSRIOConsumerPool new];

_scheduledRunloops = [NSMutableSet new];

[self _initializeStreams];

// default handlers
}

- (void)assertOnWorkQueue;
{
assert(dispatch_get_specific((__bridge void *)self) == (__bridge void *)_workQueue);
}

- (void)dealloc
{
_inputStream.delegate = nil;
_outputStream.delegate = nil;

[_inputStream close];
[_outputStream close];

if (_receivedHTTPHeaders) {
CFRelease(_receivedHTTPHeaders);
_receivedHTTPHeaders = NULL;
}
}

#ifndef NDEBUG

- (void)setReadyState:(RCTSRReadyState)aReadyState;
{
[self willChangeValueForKey:@"readyState"];
assert(aReadyState > _readyState);
_readyState = aReadyState;
[self didChangeValueForKey:@"readyState"];
}

#endif

- (void)open;
{
assert(_url);
RCTAssert(_readyState == RCTSR_CONNECTING, @"Cannot call -(void)open on RCTSRWebSocket more than once");

_selfRetain = self;

[self _connect];
}

// Calls block on delegate queue
- (void)_performDelegateBlock:(dispatch_block_t)block;
{
if (_delegateOperationQueue) {
[_delegateOperationQueue addOperationWithBlock:block];
} else {
assert(_delegateDispatchQueue);
dispatch_async(_delegateDispatchQueue, block);
}
}

- (void)setDelegateDispatchQueue:(dispatch_queue_t)queue;
{
_delegateDispatchQueue = queue;
}

- (BOOL)_checkHandshake:(CFHTTPMessageRef)httpMessage;
{
NSString *acceptHeader = CFBridgingRelease(CFHTTPMessageCopyHeaderFieldValue(httpMessage, CFSTR("Sec-WebSocket-Accept")));

if (acceptHeader == nil) {
return NO;
}

NSString *concattedString = [_secKey stringByAppendingString:RCTSRWebSocketAppendToSecKeyString];
NSString *expectedAccept = [concattedString stringBySHA1ThenBase64Encoding];

return [acceptHeader isEqualToString:expectedAccept];
}

- (void)_HTTPHeadersDidFinish;
{
NSInteger responseCode = CFHTTPMessageGetResponseStatusCode(_receivedHTTPHeaders);

if (responseCode >= 400) {
RCTSRLog(@"Request failed with response code %ld", responseCode);
[self _failWithError:[NSError errorWithDomain:RCTSRWebSocketErrorDomain code:2132 userInfo:@{NSLocalizedDescriptionKey:[NSString stringWithFormat:@"received bad response code from server %ld", (long)responseCode], RCTSRHTTPResponseErrorKey:@(responseCode)}]];
return;
}

if (![self _checkHandshake:_receivedHTTPHeaders]) {
[self _failWithError:[NSError errorWithDomain:RCTSRWebSocketErrorDomain code:2133 userInfo:@{NSLocalizedDescriptionKey: [NSString stringWithFormat:@"Invalid Sec-WebSocket-Accept response"]}]];
return;
}

NSString *negotiatedProtocol = CFBridgingRelease(CFHTTPMessageCopyHeaderFieldValue(_receivedHTTPHeaders, CFSTR("Sec-WebSocket-Protocol")));
if (negotiatedProtocol) {
// Make sure we requested the protocol
if ([_requestedProtocols indexOfObject:negotiatedProtocol] == NSNotFound) {
[self _failWithError:[NSError errorWithDomain:RCTSRWebSocketErrorDomain code:2133 userInfo:@{NSLocalizedDescriptionKey: [NSString stringWithFormat:@"Server specified Sec-WebSocket-Protocol that wasn't requested"]}]];
return;
}

_protocol = negotiatedProtocol;
}

self.readyState = RCTSR_OPEN;

if (!_didFail) {
[self _readFrameNew];
}

[self _performDelegateBlock:^{
if ([self.delegate respondsToSelector:@selector(webSocketDidOpen:)]) {
[self.delegate webSocketDidOpen:self];
};
}];
}

- (void)_readHTTPHeader;
{
if (_receivedHTTPHeaders == NULL) {
_receivedHTTPHeaders = CFHTTPMessageCreateEmpty(NULL, NO);
}

[self _readUntilHeaderCompleteWithCallback:^(RCTSRWebSocket *socket, NSData *data) {
CFHTTPMessageAppendBytes(self->_receivedHTTPHeaders, (const UInt8 *)data.bytes, data.length);

if (CFHTTPMessageIsHeaderComplete(self->_receivedHTTPHeaders)) {
RCTSRLog(@"Finished reading headers %@", CFBridgingRelease(CFHTTPMessageCopyAllHeaderFields(_receivedHTTPHeaders)));
[socket _HTTPHeadersDidFinish];
} else {
[socket _readHTTPHeader];
}
}];
}

- (void)didConnect
{
RCTSRLog(@"Connected");
CFHTTPMessageRef request = CFHTTPMessageCreateRequest(NULL, CFSTR("GET"), (__bridge CFURLRef)_url, kCFHTTPVersion1_1);

// Set host first so it defaults
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Host"), (__bridge CFStringRef)(_url.port ? [NSString stringWithFormat:@"%@:%@", _url.host, _url.port] : _url.host));

NSMutableData *keyBytes = [[NSMutableData alloc] initWithLength:16];
int result = SecRandomCopyBytes(kSecRandomDefault, keyBytes.length, keyBytes.mutableBytes);
assert(result == 0);
_secKey = [keyBytes base64EncodedStringWithOptions:0];
assert([_secKey length] == 24);

CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Upgrade"), CFSTR("websocket"));
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Connection"), CFSTR("Upgrade"));
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Sec-WebSocket-Key"), (__bridge CFStringRef)_secKey);
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Sec-WebSocket-Version"), (__bridge CFStringRef)[NSString stringWithFormat:@"%ld", (long)_webSocketVersion]);

CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Origin"), (__bridge CFStringRef)_url.RCTSR_origin);

if (_requestedProtocols) {
CFHTTPMessageSetHeaderFieldValue(request, CFSTR("Sec-WebSocket-Protocol"), (__bridge CFStringRef)[_requestedProtocols componentsJoinedByString:@", "]);
}

[_urlRequest.allHTTPHeaderFields enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
CFHTTPMessageSetHeaderFieldValue(request, (__bridge CFStringRef)key, (__bridge CFStringRef)obj);
}];

NSData *message = CFBridgingRelease(CFHTTPMessageCopySerializedMessage(request));

CFRelease(request);

[self _writeData:message];
[self _readHTTPHeader];
}

- (void)_initializeStreams;
{
assert(_url.port.unsignedIntValue <= UINT32_MAX);
uint32_t port = _url.port.unsignedIntValue;
if (port == 0) {
if (!_secure) {
port = 80;
} else {
port = 443;
}
}
NSString *host = _url.host;

CFReadStreamRef readStream = NULL;
CFWriteStreamRef writeStream = NULL;

CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)host, port, &readStream, &writeStream);

_outputStream = CFBridgingRelease(writeStream);
_inputStream = CFBridgingRelease(readStream);

if (_secure) {
NSMutableDictionary<NSString *, id> *SSLOptions = [NSMutableDictionary new];

[_outputStream setProperty:(__bridge id)kCFStreamSocketSecurityLevelNegotiatedSSL forKey:(__bridge id)kCFStreamPropertySocketSecurityLevel];

// If we're using pinned certs, don't validate the certificate chain
if (_urlRequest.RCTSR_SSLPinnedCertificates.count) {
[SSLOptions setValue:@NO forKey:(__bridge id)kCFStreamSSLValidatesCertificateChain];
}

#if DEBUG
[SSLOptions setValue:@NO forKey:(__bridge id)kCFStreamSSLValidatesCertificateChain];
RCTLogInfo(@"SocketRocket: In debug mode. Allowing connection to any root cert");
#endif

[_outputStream setProperty:SSLOptions
forKey:(__bridge id)kCFStreamPropertySSLSettings];
}

_inputStream.delegate = self;
_outputStream.delegate = self;
}

- (void)_connect;
{
if (!_scheduledRunloops.count) {
[self scheduleInRunLoop:[NSRunLoop RCTSR_networkRunLoop] forMode:NSDefaultRunLoopMode];
}

[_outputStream open];
[_inputStream open];
}

- (void)scheduleInRunLoop:(NSRunLoop *)aRunLoop forMode:(NSString *)mode;
{
[_outputStream scheduleInRunLoop:aRunLoop forMode:mode];
[_inputStream scheduleInRunLoop:aRunLoop forMode:mode];

[_scheduledRunloops addObject:@[aRunLoop, mode]];
}

- (void)unscheduleFromRunLoop:(NSRunLoop *)aRunLoop forMode:(NSString *)mode;
{
[_outputStream removeFromRunLoop:aRunLoop forMode:mode];
[_inputStream removeFromRunLoop:aRunLoop forMode:mode];

[_scheduledRunloops removeObject:@[aRunLoop, mode]];
}

- (void)close;
{
[self closeWithCode:RCTSRStatusCodeNormal reason:nil];
}

- (void)closeWithCode:(NSInteger)code reason:(NSString *)reason;
{
assert(code);
dispatch_async(_workQueue, ^{
if (self.readyState == RCTSR_CLOSING || self.readyState == RCTSR_CLOSED) {
return;
}

BOOL wasConnecting = self.readyState == RCTSR_CONNECTING;

self.readyState = RCTSR_CLOSING;

RCTSRLog(@"Closing with code %ld reason %@", code, reason);

if (wasConnecting) {
[self _disconnect];
return;
}

size_t maxMsgSize = [reason maximumLengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSMutableData *mutablePayload = [[NSMutableData alloc] initWithLength:sizeof(uint16_t) + maxMsgSize];
NSData *payload = mutablePayload;

((uint16_t *)mutablePayload.mutableBytes)[0] = EndianU16_BtoN(code);

if (reason) {
NSRange remainingRange = {0};

NSUInteger usedLength = 0;

BOOL success = [reason getBytes:(char *)mutablePayload.mutableBytes + sizeof(uint16_t) maxLength:payload.length - sizeof(uint16_t) usedLength:&usedLength encoding:NSUTF8StringEncoding options:NSStringEncodingConversionExternalRepresentation range:NSMakeRange(0, reason.length) remainingRange:&remainingRange];

assert(success);
assert(remainingRange.length == 0);

if (usedLength != maxMsgSize) {
payload = [payload subdataWithRange:NSMakeRange(0, usedLength + sizeof(uint16_t))];
}
}

[self _sendFrameWithOpcode:RCTSROpCodeConnectionClose data:payload];
});
}

- (void)_closeWithProtocolError:(NSString *)message;
{
// Need to shunt this on the _callbackQueue first to see if they received any messages
[self _performDelegateBlock:^{
[self closeWithCode:RCTSRStatusCodeProtocolError reason:message];
dispatch_async(self->_workQueue, ^{
[self _disconnect];
});
}];
}

- (void)_failWithError:(NSError *)error;
{
dispatch_async(_workQueue, ^{
if (self.readyState != RCTSR_CLOSED) {
self->_failed = YES;
[self _performDelegateBlock:^{
if ([self.delegate respondsToSelector:@selector(webSocket:didFailWithError:)]) {
[self.delegate webSocket:self didFailWithError:error];
}
}];

self.readyState = RCTSR_CLOSED;

RCTSRLog(@"Failing with error %@", error.localizedDescription);

[self _disconnect];
[self _scheduleCleanup];
}
});
}

- (void)_writeData:(NSData *)data;
{
[self assertOnWorkQueue];

if (_closeWhenFinishedWriting) {
return;
}
[_outputBuffer appendData:data];
[self _pumpWriting];
}

- (void)send:(id)data;
{
RCTAssert(self.readyState != RCTSR_CONNECTING, @"Invalid State: Cannot call send: until connection is open");
// TODO: maybe not copy this for performance
data = [data copy];
dispatch_async(_workQueue, ^{
if ([data isKindOfClass:[NSString class]]) {
[self _sendFrameWithOpcode:RCTSROpCodeTextFrame data:[(NSString *)data dataUsingEncoding:NSUTF8StringEncoding]];
} else if ([data isKindOfClass:[NSData class]]) {
[self _sendFrameWithOpcode:RCTSROpCodeBinaryFrame data:data];
} else if (data == nil) {
[self _sendFrameWithOpcode:RCTSROpCodeTextFrame data:data];
} else {
assert(NO);
}
});
}

- (void)sendPing:(NSData *)data;
{
RCTAssert(self.readyState == RCTSR_OPEN, @"Invalid State: Cannot call send: until connection is open");
// TODO: maybe not copy this for performance
data = [data copy] ?: [NSData data]; // It's okay for a ping to be empty
dispatch_async(_workQueue, ^{
[self _sendFrameWithOpcode:RCTSROpCodePing data:data];
});
}

- (void)handlePing:(NSData *)pingData;
{
// Need to pingpong this off _callbackQueue first to make sure messages happen in order
[self _performDelegateBlock:^{
dispatch_async(self->_workQueue, ^{
[self _sendFrameWithOpcode:RCTSROpCodePong data:pingData];
});
}];
}

- (void)handlePong:(NSData *)pongData;
{
RCTSRLog(@"Received pong");
[self _performDelegateBlock:^{
if ([self.delegate respondsToSelector:@selector(webSocket:didReceivePong:)]) {
[self.delegate webSocket:self didReceivePong:pongData];
}
}];
}

- (void)_handleMessage:(id)message
{
RCTSRLog(@"Received message");
[self _performDelegateBlock:^{
[self.delegate webSocket:self didReceiveMessage:message];
}];
}

static inline BOOL closeCodeIsValid(int closeCode)
{
if (closeCode < 1000) {
return NO;
}

if (closeCode >= 1000 && closeCode <= 1011) {
if (closeCode == 1004 ||
closeCode == 1005 ||
closeCode == 1006) {
return NO;
}
return YES;
}

if (closeCode >= 3000 && closeCode <= 3999) {
return YES;
}

if (closeCode >= 4000 && closeCode <= 4999) {
return YES;
}

return NO;
}

// Note from RFC:
//
// If there is a body, the first two
// bytes of the body MUST be a 2-byte unsigned integer (in network byte
// order) representing a status code with value /code/ defined in
// Section 7.4. Following the 2-byte integer the body MAY contain UTF-8
// encoded data with value /reason/, the interpretation of which is not
// defined by this specification.

- (void)handleCloseWithData:(NSData *)data;
{
size_t dataSize = data.length;
__block uint16_t closeCode = 0;

RCTSRLog(@"Received close frame");

if (dataSize == 1) {
// TODO: handle error
[self _closeWithProtocolError:@"Payload for close must be larger than 2 bytes"];
return;
} else if (dataSize >= 2) {
[data getBytes:&closeCode length:sizeof(closeCode)];
_closeCode = EndianU16_BtoN(closeCode);
if (!closeCodeIsValid(_closeCode)) {
[self _closeWithProtocolError:[NSString stringWithFormat:@"Cannot have close code of %d", _closeCode]];
return;
}
if (dataSize > 2) {
_closeReason = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(2, dataSize - 2)] encoding:NSUTF8StringEncoding];
if (!_closeReason) {
[self _closeWithProtocolError:@"Close reason MUST be valid UTF-8"];
return;
}
}
} else {
_closeCode = RCTSRStatusNoStatusReceived;
}

[self assertOnWorkQueue];

if (self.readyState == RCTSR_OPEN) {
[self closeWithCode:1000 reason:nil];
}
dispatch_async(_workQueue, ^{
[self _disconnect];
});
}

- (void)_disconnect;
{
[self assertOnWorkQueue];
RCTSRLog(@"Trying to disconnect");
_closeWhenFinishedWriting = YES;
[self _pumpWriting];
}

- (void)_handleFrameWithData:(NSData *)frameData opCode:(NSInteger)opcode;
{
// Check that the current data is valid UTF8

BOOL isControlFrame = (opcode == RCTSROpCodePing || opcode == RCTSROpCodePong || opcode == RCTSROpCodeConnectionClose);
if (!isControlFrame) {
[self _readFrameNew];
} else {
dispatch_async(_workQueue, ^{
[self _readFrameContinue];
});
}

switch (opcode) {
case RCTSROpCodeTextFrame: {
NSString *str = [[NSString alloc] initWithData:frameData encoding:NSUTF8StringEncoding];
if (str == nil && frameData) {
[self closeWithCode:RCTSRStatusCodeInvalidUTF8 reason:@"Text frames must be valid UTF-8"];
dispatch_async(_workQueue, ^{
[self _disconnect];
});

return;
}
[self _handleMessage:str];
break;
}
case RCTSROpCodeBinaryFrame:
[self _handleMessage:[frameData copy]];
break;
case RCTSROpCodeConnectionClose:
[self handleCloseWithData:frameData];
break;
case RCTSROpCodePing:
[self handlePing:frameData];
break;
case RCTSROpCodePong:
[self handlePong:frameData];
break;
default:
[self _closeWithProtocolError:[NSString stringWithFormat:@"Unknown opcode %ld", (long)opcode]];
// TODO: Handle invalid opcode
break;
}
}

- (void)_handleFrameHeader:(frame_header)frame_header curData:(NSData *)curData;
{
assert(frame_header.opcode != 0);

if (self.readyState != RCTSR_OPEN) {
return;
}

BOOL isControlFrame = (frame_header.opcode == RCTSROpCodePing || frame_header.opcode == RCTSROpCodePong || frame_header.opcode == RCTSROpCodeConnectionClose);

if (isControlFrame && !frame_header.fin) {
[self _closeWithProtocolError:@"Fragmented control frames not allowed"];
return;
}

if (isControlFrame && frame_header.payload_length >= 126) {
[self _closeWithProtocolError:@"Control frames cannot have payloads larger than 126 bytes"];
return;
}

if (!isControlFrame) {
_currentFrameOpcode = frame_header.opcode;
_currentFrameCount += 1;
}

if (frame_header.payload_length == 0) {
if (isControlFrame) {
[self _handleFrameWithData:curData opCode:frame_header.opcode];
} else {
if (frame_header.fin) {
[self _handleFrameWithData:_currentFrameData opCode:frame_header.opcode];
} else {
// TODO: add assert that opcode is not a control;
[self _readFrameContinue];
}
}
} else {
assert(frame_header.payload_length <= SIZE_T_MAX);
[self _addConsumerWithDataLength:(size_t)frame_header.payload_length callback:^(RCTSRWebSocket *socket, NSData *newData) {
if (isControlFrame) {
[socket _handleFrameWithData:newData opCode:frame_header.opcode];
} else {
if (frame_header.fin) {
[socket _handleFrameWithData:socket->_currentFrameData opCode:frame_header.opcode];
} else {
// TODO: add assert that opcode is not a control;
[socket _readFrameContinue];
}

}
} readToCurrentFrame:!isControlFrame unmaskBytes:frame_header.masked];
}
}

/* From RFC:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-------+-+-------------+-------------------------------+
|F|R|R|R| opcode|M| Payload len | Extended payload length |
|I|S|S|S| (4) |A| (7) | (16/64) |
|N|V|V|V| |S| | (if payload len==126/127) |
| |1|2|3| |K| | |
+-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
| Extended payload length continued, if payload len == 127 |
+ - - - - - - - - - - - - - - - +-------------------------------+
| |Masking-key, if MASK set to 1 |
+-------------------------------+-------------------------------+
| Masking-key (continued) | Payload Data |
+-------------------------------- - - - - - - - - - - - - - - - +
: Payload Data continued ... :
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
| Payload Data continued ... |
+---------------------------------------------------------------+
*/

static const uint8_t RCTSRFinMask = 0x80;
static const uint8_t RCTSROpCodeMask = 0x0F;
static const uint8_t RCTSRRsvMask = 0x70;
static const uint8_t RCTSRMaskMask = 0x80;
static const uint8_t RCTSRPayloadLenMask = 0x7F;

- (void)_readFrameContinue;
{
assert((_currentFrameCount == 0 && _currentFrameOpcode == 0) || (_currentFrameCount > 0 && _currentFrameOpcode > 0));

[self _addConsumerWithDataLength:2 callback:^(RCTSRWebSocket *socket, NSData *data) {
__block frame_header header = {0};

const uint8_t *headerBuffer = data.bytes;
assert(data.length >= 2);

if (headerBuffer[0] & RCTSRRsvMask) {
[socket _closeWithProtocolError:@"Server used RSV bits"];
return;
}

uint8_t receivedOpcode = (RCTSROpCodeMask &headerBuffer[0]);

BOOL isControlFrame = (receivedOpcode == RCTSROpCodePing || receivedOpcode == RCTSROpCodePong || receivedOpcode == RCTSROpCodeConnectionClose);

if (!isControlFrame && receivedOpcode != 0 && socket->_currentFrameCount > 0) {
[socket _closeWithProtocolError:@"all data frames after the initial data frame must have opcode 0"];
return;
}

if (receivedOpcode == 0 && socket->_currentFrameCount == 0) {
[socket _closeWithProtocolError:@"cannot continue a message"];
return;
}

header.opcode = receivedOpcode == 0 ? socket->_currentFrameOpcode : receivedOpcode;

header.fin = !!(RCTSRFinMask &headerBuffer[0]);

header.masked = !!(RCTSRMaskMask &headerBuffer[1]);
header.payload_length = RCTSRPayloadLenMask & headerBuffer[1];

headerBuffer = NULL;

if (header.masked) {
[socket _closeWithProtocolError:@"Client must receive unmasked data"];
}

size_t extra_bytes_needed = header.masked ? sizeof(self->_currentReadMaskKey) : 0;

if (header.payload_length == 126) {
extra_bytes_needed += sizeof(uint16_t);
} else if (header.payload_length == 127) {
extra_bytes_needed += sizeof(uint64_t);
}

if (extra_bytes_needed == 0) {
[socket _handleFrameHeader:header curData:socket->_currentFrameData];
} else {
[socket _addConsumerWithDataLength:extra_bytes_needed callback:^(RCTSRWebSocket *_socket, NSData *_data) {
size_t mapped_size = _data.length;
const void *mapped_buffer = _data.bytes;
size_t offset = 0;

if (header.payload_length == 126) {
assert(mapped_size >= sizeof(uint16_t));
uint16_t newLen = EndianU16_BtoN(*(uint16_t *)(mapped_buffer));
header.payload_length = newLen;
offset += sizeof(uint16_t);
} else if (header.payload_length == 127) {
assert(mapped_size >= sizeof(uint64_t));
header.payload_length = EndianU64_BtoN(*(uint64_t *)(mapped_buffer));
offset += sizeof(uint64_t);
} else {
assert(header.payload_length < 126 && header.payload_length >= 0);
}

if (header.masked) {
assert(mapped_size >= sizeof(self->_currentReadMaskOffset) + offset);
memcpy(_socket->_currentReadMaskKey, ((uint8_t *)mapped_buffer) + offset, sizeof(_socket->_currentReadMaskKey));
}

[_socket _handleFrameHeader:header curData:_socket->_currentFrameData];
} readToCurrentFrame:NO unmaskBytes:NO];
}
} readToCurrentFrame:NO unmaskBytes:NO];
}

- (void)_readFrameNew;
{
dispatch_async(_workQueue, ^{
self->_currentFrameData.length = 0;

self->_currentFrameOpcode = 0;
self->_currentFrameCount = 0;
self->_readOpCount = 0;
self->_currentStringScanPosition = 0;

[self _readFrameContinue];
});
}

- (void)_pumpWriting;
{
[self assertOnWorkQueue];

NSUInteger dataLength = _outputBuffer.length;
if (dataLength - _outputBufferOffset > 0 && _outputStream.hasSpaceAvailable) {
NSInteger bytesWritten = [_outputStream write:_outputBuffer.bytes + _outputBufferOffset maxLength:dataLength - _outputBufferOffset];
if (bytesWritten == -1) {
[self _failWithError:[NSError errorWithDomain:RCTSRWebSocketErrorDomain code:2145 userInfo:@{NSLocalizedDescriptionKey: @"Error writing to stream"}]];
return;
}

_outputBufferOffset += bytesWritten;

if (_outputBufferOffset > 4096 && _outputBufferOffset > (_outputBuffer.length >> 1)) {
_outputBuffer = [[NSMutableData alloc] initWithBytes:(char *)_outputBuffer.bytes + _outputBufferOffset length:_outputBuffer.length - _outputBufferOffset];
_outputBufferOffset = 0;
}
}

if (_closeWhenFinishedWriting &&
_outputBuffer.length - _outputBufferOffset == 0 &&
(_inputStream.streamStatus != NSStreamStatusNotOpen &&
_inputStream.streamStatus != NSStreamStatusClosed) &&
!_sentClose) {
_sentClose = YES;

[_outputStream close];
[_inputStream close];

for (NSArray *runLoop in [_scheduledRunloops copy]) {
[self unscheduleFromRunLoop:runLoop[0] forMode:runLoop[1]];
}

if (!_failed) {
[self _performDelegateBlock:^{
if ([self.delegate respondsToSelector:@selector(webSocket:didCloseWithCode:reason:wasClean:)]) {
[self.delegate webSocket:self didCloseWithCode:self->_closeCode reason:self->_closeReason wasClean:YES];
}
}];
}

_selfRetain = nil;
}
}

- (void)_addConsumerWithScanner:(stream_scanner)consumer callback:(data_callback)callback;
{
[self assertOnWorkQueue];
[self _addConsumerWithScanner:consumer callback:callback dataLength:0];
}

- (void)_addConsumerWithDataLength:(size_t)dataLength callback:(data_callback)callback readToCurrentFrame:(BOOL)readToCurrentFrame unmaskBytes:(BOOL)unmaskBytes;
{
[self assertOnWorkQueue];
assert(dataLength);

[_consumers addObject:[_consumerPool consumerWithScanner:nil handler:callback bytesNeeded:dataLength readToCurrentFrame:readToCurrentFrame unmaskBytes:unmaskBytes]];
[self _pumpScanner];
}

- (void)_addConsumerWithScanner:(stream_scanner)consumer callback:(data_callback)callback dataLength:(size_t)dataLength;
{
[self assertOnWorkQueue];
[_consumers addObject:[_consumerPool consumerWithScanner:consumer handler:callback bytesNeeded:dataLength readToCurrentFrame:NO unmaskBytes:NO]];
[self _pumpScanner];
}

static const char CRLFCRLFBytes[] = {'\r', '\n', '\r', '\n'};

- (void)_readUntilHeaderCompleteWithCallback:(data_callback)dataHandler;
{
[self _readUntilBytes:CRLFCRLFBytes length:sizeof(CRLFCRLFBytes) callback:dataHandler];
}

- (void)_readUntilBytes:(const void *)bytes length:(size_t)length callback:(data_callback)dataHandler;
{
// TODO: optimize so this can continue from where we last searched
stream_scanner consumer = ^size_t(NSData *data) {
__block size_t found_size = 0;
__block size_t match_count = 0;

size_t size = data.length;
const unsigned char *buffer = data.bytes;
for (size_t i = 0; i < size; i++ ) {
if (((const unsigned char *)buffer) == ((const unsigned char *)bytes)[match_count]) {
match_count += 1;
if (match_count == length) {
found_size = i + 1;
break;
}
} else {
match_count = 0;
}
}
return found_size;
};
[self _addConsumerWithScanner:consumer callback:dataHandler];
}

// Returns true if did work
- (BOOL)_innerPumpScanner
{
BOOL didWork = NO;

if (self.readyState >= RCTSR_CLOSING) {
return didWork;
}

if (!_consumers.count) {
return didWork;
}

size_t curSize = _readBuffer.length - _readBufferOffset;
if (!curSize) {
return didWork;
}

RCTSRIOConsumer *consumer = _consumers[0];

size_t bytesNeeded = consumer.bytesNeeded;

size_t foundSize = 0;
if (consumer.consumer) {
NSData *tempView = [NSData dataWithBytesNoCopy:(char *)_readBuffer.bytes + _readBufferOffset length:_readBuffer.length - _readBufferOffset freeWhenDone:NO];
foundSize = consumer.consumer(tempView);
} else {
assert(consumer.bytesNeeded);
if (curSize >= bytesNeeded) {
foundSize = bytesNeeded;
} else if (consumer.readToCurrentFrame) {
foundSize = curSize;
}
}

NSData *slice = nil;
if (consumer.readToCurrentFrame || foundSize) {
NSRange sliceRange = NSMakeRange(_readBufferOffset, foundSize);
slice = [_readBuffer subdataWithRange:sliceRange];

_readBufferOffset += foundSize;

if (_readBufferOffset > 4096 && _readBufferOffset > (_readBuffer.length >> 1)) {
_readBuffer = [[NSMutableData alloc] initWithBytes:(char *)_readBuffer.bytes + _readBufferOffset length:_readBuffer.length - _readBufferOffset]; _readBufferOffset = 0;
}

if (consumer.unmaskBytes) {
NSMutableData *mutableSlice = [slice mutableCopy];

NSUInteger len = mutableSlice.length;
uint8_t *bytes = mutableSlice.mutableBytes;

for (NSUInteger i = 0; i < len; i++) {
bytes = bytes ^ _currentReadMaskKey[_currentReadMaskOffset % sizeof(_currentReadMaskKey)];
_currentReadMaskOffset += 1;
}

slice = mutableSlice;
}

if (consumer.readToCurrentFrame) {
[_currentFrameData appendData:slice];

_readOpCount += 1;

if (_currentFrameOpcode == RCTSROpCodeTextFrame) {
// Validate UTF8 stuff.
size_t currentDataSize = _currentFrameData.length;
if (_currentFrameOpcode == RCTSROpCodeTextFrame && currentDataSize > 0) {
// TODO: Optimize this. Don't really have to copy all the data each time

size_t scanSize = currentDataSize - _currentStringScanPosition;

NSData *scan_data = [_currentFrameData subdataWithRange:NSMakeRange(_currentStringScanPosition, scanSize)];
int32_t valid_utf8_size = validate_dispatch_data_partial_string(scan_data);

if (valid_utf8_size == -1) {
[self closeWithCode:RCTSRStatusCodeInvalidUTF8 reason:@"Text frames must be valid UTF-8"];
dispatch_async(_workQueue, ^{
[self _disconnect];
});
return didWork;
} else {
_currentStringScanPosition += valid_utf8_size;
}
}
}

consumer.bytesNeeded -= foundSize;

if (consumer.bytesNeeded == 0) {
[_consumers removeObjectAtIndex:0];
consumer.handler(self, nil);
[_consumerPool returnConsumer:consumer];
didWork = YES;
}
} else if (foundSize) {
[_consumers removeObjectAtIndex:0];
consumer.handler(self, slice);
[_consumerPool returnConsumer:consumer];
didWork = YES;
}
}
return didWork;
}

- (void)_pumpScanner;
{
[self assertOnWorkQueue];

if (!_isPumping) {
_isPumping = YES;
} else {
return;
}

while ([self _innerPumpScanner]) {}

_isPumping = NO;
}

//#define NOMASK

static const size_t RCTSRFrameHeaderOverhead = 32;

- (void)_sendFrameWithOpcode:(RCTSROpCode)opcode data:(id)data;
{
[self assertOnWorkQueue];

if (nil == data) {
return;
}

RCTAssert([data isKindOfClass:[NSData class]] || [data isKindOfClass:[NSString class]], @"NSString or NSData");

size_t payloadLength = [data isKindOfClass:[NSString class]] ? [(NSString *)data lengthOfBytesUsingEncoding:NSUTF8StringEncoding] : [data length];

NSMutableData *frame = [[NSMutableData alloc] initWithLength:payloadLength + RCTSRFrameHeaderOverhead];
if (!frame) {
[self closeWithCode:RCTSRStatusCodeMessageTooBig reason:@"Message too big"];
return;
}
uint8_t *frame_buffer = (uint8_t *)frame.mutableBytes;

// set fin
frame_buffer[0] = RCTSRFinMask | opcode;

BOOL useMask = YES;
#ifdef NOMASK
useMask = NO;
#endif

if (useMask) {
// set the mask and header
frame_buffer[1] |= RCTSRMaskMask;
}

size_t frame_buffer_size = 2;

const uint8_t *unmasked_payload = NULL;
if ([data isKindOfClass:[NSData class]]) {
unmasked_payload = (uint8_t *)[data bytes];
} else if ([data isKindOfClass:[NSString class]]) {
unmasked_payload = (const uint8_t *)[data UTF8String];
} else {
return;
}

if (payloadLength < 126) {
frame_buffer[1] |= payloadLength;
} else if (payloadLength <= UINT16_MAX) {
frame_buffer[1] |= 126;
*((uint16_t *)(frame_buffer + frame_buffer_size)) = EndianU16_BtoN((uint16_t)payloadLength);
frame_buffer_size += sizeof(uint16_t);
} else {
frame_buffer[1] |= 127;
*((uint64_t *)(frame_buffer + frame_buffer_size)) = EndianU64_BtoN((uint64_t)payloadLength);
frame_buffer_size += sizeof(uint64_t);
}

if (!useMask) {
for (size_t i = 0; i < payloadLength; i++) {
frame_buffer[frame_buffer_size] = unmasked_payload;
frame_buffer_size += 1;
}
} else {
uint8_t *mask_key = frame_buffer + frame_buffer_size;
int result = SecRandomCopyBytes(kSecRandomDefault, sizeof(uint32_t), (uint8_t *)mask_key);
assert(result == 0);
frame_buffer_size += sizeof(uint32_t);

// TODO: could probably optimize this with SIMD
for (size_t i = 0; i < payloadLength; i++) {
frame_buffer[frame_buffer_size] = unmasked_payload ^ mask_key[i % sizeof(uint32_t)];
frame_buffer_size += 1;
}
}

assert(frame_buffer_size <= [frame length]);
frame.length = frame_buffer_size;

[self _writeData:frame];
}

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode;
{
if (_secure && !_pinnedCertFound && (eventCode == NSStreamEventHasBytesAvailable || eventCode == NSStreamEventHasSpaceAvailable)) {
NSArray *sslCerts = _urlRequest.RCTSR_SSLPinnedCertificates;
if (sslCerts) {
SecTrustRef secTrust = (__bridge SecTrustRef)[aStream propertyForKey:(__bridge id)kCFStreamPropertySSLPeerTrust];
if (secTrust) {
NSInteger numCerts = SecTrustGetCertificateCount(secTrust);
for (NSInteger i = 0; i < numCerts && !_pinnedCertFound; i++) {
SecCertificateRef cert = SecTrustGetCertificateAtIndex(secTrust, i);
NSData *certData = CFBridgingRelease(SecCertificateCopyData(cert));

for (id ref in sslCerts) {
SecCertificateRef trustedCert = (__bridge SecCertificateRef)ref;
NSData *trustedCertData = CFBridgingRelease(SecCertificateCopyData(trustedCert));

if ([trustedCertData isEqualToData:certData]) {
_pinnedCertFound = YES;
break;
}
}
}
}

if (!_pinnedCertFound) {
dispatch_async(_workQueue, ^{
[self _failWithError:[NSError errorWithDomain:RCTSRWebSocketErrorDomain code:23556 userInfo:@{NSLocalizedDescriptionKey: [NSString stringWithFormat:@"Invalid server cert"]}]];
});
return;
}
}
}

// _workQueue cannot be NULL
if (!_workQueue) { return; }
__weak typeof(self) weakSelf = self;
dispatch_async(_workQueue, ^{
typeof(self) strongSelf = weakSelf;
if (!strongSelf) { return; }
[strongSelf safeHandleEvent:eventCode stream:aStream];
});
}

- (void)safeHandleEvent:(NSStreamEvent)eventCode stream:(NSStream *)aStream
{
switch (eventCode) {
case NSStreamEventOpenCompleted: {
RCTSRLog(@"NSStreamEventOpenCompleted %@", aStream);
if (self.readyState >= RCTSR_CLOSING) {
return;
}
assert(self->_readBuffer);

if (self.readyState == RCTSR_CONNECTING && aStream == self->_inputStream) {
[self didConnect];
}
[self _pumpWriting];
[self _pumpScanner];
break;
}

case NSStreamEventErrorOccurred: {
RCTSRLog(@"NSStreamEventErrorOccurred %@ %@", aStream, [aStream.streamError copy]);
// TODO: specify error better!
[self _failWithError:aStream.streamError];
self->_readBufferOffset = 0;
self->_readBuffer.length = 0;
break;

}

case NSStreamEventEndEncountered: {
[self _pumpScanner];
RCTSRLog(@"NSStreamEventEndEncountered %@", aStream);
if (aStream.streamError) {
[self _failWithError:aStream.streamError];
} else {
dispatch_async(self->_workQueue, ^{
if (self.readyState != RCTSR_CLOSED) {
self.readyState = RCTSR_CLOSED;
[self _scheduleCleanup];
}

if (!self->_sentClose && !self->_failed) {
self->_sentClose = YES;
// If we get closed in this state it's probably not clean because we should be sending this when we send messages
[self _performDelegateBlock:^{
if ([self.delegate respondsToSelector:@selector(webSocket:didCloseWithCode:reason:wasClean:)]) {
[self.delegate webSocket:self didCloseWithCode:RCTSRStatusCodeGoingAway reason:@"Stream end encountered" wasClean:NO];
}
}];
}
});
}

break;
}

case NSStreamEventHasBytesAvailable: {
RCTSRLog(@"NSStreamEventHasBytesAvailable %@", aStream);
const int bufferSize = 2048;
uint8_t buffer[bufferSize];

while (self->_inputStream.hasBytesAvailable) {
NSInteger bytes_read = [self->_inputStream read:buffer maxLength:bufferSize];

if (bytes_read > 0) {
[self->_readBuffer appendBytes:buffer length:bytes_read];
} else if (bytes_read < 0) {
[self _failWithError:self->_inputStream.streamError];
}

if (bytes_read != bufferSize) {
break;
}
};
[self _pumpScanner];
break;
}

case NSStreamEventHasSpaceAvailable: {
RCTSRLog(@"NSStreamEventHasSpaceAvailable %@", aStream);
[self _pumpWriting];
break;
}

default:
RCTSRLog(@"(default) %@", aStream);
break;
}
}

- (void)_scheduleCleanup
{
if (_cleanupScheduled) {
return;
}

_cleanupScheduled = YES;

// Cleanup NSStream's delegate in the same RunLoop used by the streams themselves:
// This way we'll prevent race conditions between handleEvent and SRWebsocket's dealloc
NSTimer *timer = [NSTimer timerWithTimeInterval:(0.0f) target:self selector:@selector(_cleanupSelfReference:) userInfo:nil repeats:NO];
[[NSRunLoop RCTSR_networkRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}

- (void)_cleanupSelfReference:(NSTimer *)timer
{
// Remove the streams, right now, from the networkRunLoop
[_inputStream close];
[_outputStream close];

// Unschedule from RunLoop
for (NSArray *runLoop in [_scheduledRunloops copy]) {
[self unscheduleFromRunLoop:runLoop[0] forMode:runLoop[1]];
}

// Nuke NSStream's delegate
_inputStream.delegate = nil;
_outputStream.delegate = nil;

// Cleanup selfRetain in the same GCD queue as usual
dispatch_async(_workQueue, ^{
self->_selfRetain = nil;
});
}

@end

@implementation RCTSRIOConsumer

- (void)setupWithScanner:(stream_scanner)scanner handler:(data_callback)handler bytesNeeded:(size_t)bytesNeeded readToCurrentFrame:(BOOL)readToCurrentFrame unmaskBytes:(BOOL)unmaskBytes;
{
_consumer = [scanner copy];
_handler = [handler copy];
_bytesNeeded = bytesNeeded;
_readToCurrentFrame = readToCurrentFrame;
_unmaskBytes = unmaskBytes;
assert(_consumer || _bytesNeeded);
}

@end

@implementation RCTSRIOConsumerPool
{
NSUInteger _poolSize;
NSMutableArray<RCTSRIOConsumer *> *_bufferedConsumers;
}

- (instancetype)initWithBufferCapacity:(NSUInteger)poolSize;
{
if ((self = [super init])) {
_poolSize = poolSize;
_bufferedConsumers = [[NSMutableArray alloc] initWithCapacity:poolSize];
}
return self;
}

- (instancetype)init
{
return [self initWithBufferCapacity:8];
}

- (RCTSRIOConsumer *)consumerWithScanner:(stream_scanner)scanner handler:(data_callback)handler bytesNeeded:(size_t)bytesNeeded readToCurrentFrame:(BOOL)readToCurrentFrame unmaskBytes:(BOOL)unmaskBytes;
{
RCTSRIOConsumer *consumer = nil;
if (_bufferedConsumers.count) {
consumer = _bufferedConsumers.lastObject;
[_bufferedConsumers removeLastObject];
} else {
consumer = [RCTSRIOConsumer new];
}

[consumer setupWithScanner:scanner handler:handler bytesNeeded:bytesNeeded readToCurrentFrame:readToCurrentFrame unmaskBytes:unmaskBytes];

return consumer;
}

- (void)returnConsumer:(RCTSRIOConsumer *)consumer;
{
if (_bufferedConsumers.count < _poolSize) {
[_bufferedConsumers addObject:consumer];
}
}

@end

@implementation NSURLRequest (CertificateAdditions)

- (NSArray *)RCTSR_SSLPinnedCertificates;
{
return [NSURLProtocol propertyForKey:@"RCTSR_SSLPinnedCertificates" inRequest:self];
}

@end

@implementation NSMutableURLRequest (CertificateAdditions)

- (NSArray *)RCTSR_SSLPinnedCertificates;
{
return [NSURLProtocol propertyForKey:@"RCTSR_SSLPinnedCertificates" inRequest:self];
}

- (void)setRCTSR_SSLPinnedCertificates:(NSArray *)RCTSR_SSLPinnedCertificates;
{
[NSURLProtocol setProperty:RCTSR_SSLPinnedCertificates forKey:@"RCTSR_SSLPinnedCertificates" inRequest:self];
}

@end

@implementation NSURL (RCTSRWebSocket)

- (NSString *)RCTSR_origin;
{
NSString *scheme = self.scheme.lowercaseString;

if ([scheme isEqualToString:@"wss"]) {
scheme = @"https";
} else if ([scheme isEqualToString:@"ws"]) {
scheme = @"http";
}

int defaultPort = ([scheme isEqualToString:@"https"] ? 443 :
[scheme isEqualToString:@"http"] ? 80 :
-1);
int port = self.port.intValue;
if (port > 0 && port != defaultPort) {
return [NSString stringWithFormat:@"%@://%@:%d", scheme, self.host, port];
} else {
return [NSString stringWithFormat:@"%@://%@", scheme, self.host];
}
}

@end

static _RCTSRRunLoopThread *networkThread = nil;
static NSRunLoop *networkRunLoop = nil;

@implementation NSRunLoop (RCTSRWebSocket)

+ (NSRunLoop *)RCTSR_networkRunLoop
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
networkThread = [_RCTSRRunLoopThread new];
networkThread.name = @"com.squareup.SocketRocket.NetworkThread";
[networkThread start];
networkRunLoop = networkThread.runLoop;
});

return networkRunLoop;
}

@end

@implementation _RCTSRRunLoopThread
{
dispatch_group_t _waitGroup;
}

@synthesize runLoop = _runLoop;

- (instancetype)init
{
if ((self = [super init])) {
_waitGroup = dispatch_group_create();
dispatch_group_enter(_waitGroup);
}
return self;
}

- (void)main;
{
@autoreleasepool {
_runLoop = [NSRunLoop currentRunLoop];
dispatch_group_leave(_waitGroup);

NSTimer *timer = [[NSTimer alloc] initWithFireDate:[NSDate distantFuture] interval:0.0 target:self selector:@selector(step) userInfo:nil repeats:NO];
[_runLoop addTimer:timer forMode:NSDefaultRunLoopMode];

while ([_runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]) { }
assert(NO);
}
}

- (void)step
{
// Does nothing
}

- (NSRunLoop *)runLoop;
{
dispatch_group_wait(_waitGroup, DISPATCH_TIME_FOREVER);
return _runLoop;
}

@end