RCTNetworking.mm 24.7 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */


#import <mutex>

#import <React/RCTAssert.h>
#import <React/RCTConvert.h>
#import <React/RCTEventDispatcher.h>
#import <React/RCTLog.h>
#import <React/RCTNetworkTask.h>
#import <React/RCTNetworking.h>
#import <React/RCTURLRequestHandler.h>
#import <React/RCTUtils.h>

#import "RCTHTTPRequestHandler.h"

typedef RCTURLRequestCancellationBlock (^RCTHTTPQueryResult)(NSError *error, NSDictionary<NSString *, id> *result);

@interface RCTNetworking ()

- (RCTURLRequestCancellationBlock)processDataForHTTPQuery:(NSDictionary<NSString *, id> *)data
                                                 callback:(RCTHTTPQueryResult)callback;
@end

/**
 * Helper to convert FormData payloads into multipart/formdata requests.
 */
@interface RCTHTTPFormDataHelper : NSObject

@property (nonatomic, weak) RCTNetworking *networker;

@end

@implementation RCTHTTPFormDataHelper
{
  NSMutableArray<NSDictionary<NSString *, id> *> *_parts;
  NSMutableData *_multipartBody;
  RCTHTTPQueryResult _callback;
  NSString *_boundary;
}

static NSString *RCTGenerateFormBoundary()
{
  const size_t boundaryLength = 70;
  const char *boundaryChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.";

  char *bytes = (char*)malloc(boundaryLength);
  size_t charCount = strlen(boundaryChars);
  for (int i = 0; i < boundaryLength; i++) {
    bytes[i] = boundaryChars[arc4random_uniform((u_int32_t)charCount)];
  }
  return [[NSString alloc] initWithBytesNoCopy:bytes length:boundaryLength encoding:NSUTF8StringEncoding freeWhenDone:YES];
}

- (RCTURLRequestCancellationBlock)process:(NSArray<NSDictionary *> *)formData
                                 callback:(RCTHTTPQueryResult)callback
{
  RCTAssertThread(_networker.methodQueue, @"process: must be called on method queue");

  if (formData.count == 0) {
    return callback(nil, nil);
  }

  _parts = [formData mutableCopy];
  _callback = callback;
  _multipartBody = [NSMutableData new];
  _boundary = RCTGenerateFormBoundary();

  return [_networker processDataForHTTPQuery:_parts[0] callback:^(NSError *error, NSDictionary<NSString *, id> *result) {
    return [self handleResult:result error:error];
  }];
}

- (RCTURLRequestCancellationBlock)handleResult:(NSDictionary<NSString *, id> *)result
                                         error:(NSError *)error
{
  RCTAssertThread(_networker.methodQueue, @"handleResult: must be called on method queue");

  if (error) {
    return _callback(error, nil);
  }

  // Start with boundary.
  [_multipartBody appendData:[[NSString stringWithFormat:@"--%@\r\n", _boundary]
                              dataUsingEncoding:NSUTF8StringEncoding]];

  // Print headers.
  NSMutableDictionary<NSString *, NSString *> *headers = [_parts[0][@"headers"] mutableCopy];
  NSString *partContentType = result[@"contentType"];
  if (partContentType != nil) {
    headers[@"content-type"] = partContentType;
  }
  [headers enumerateKeysAndObjectsUsingBlock:^(NSString *parameterKey, NSString *parameterValue, BOOL *stop) {
    [self->_multipartBody appendData:[[NSString stringWithFormat:@"%@: %@\r\n", parameterKey, parameterValue]
                                dataUsingEncoding:NSUTF8StringEncoding]];
  }];

  // Add the body.
  [_multipartBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
  [_multipartBody appendData:result[@"body"]];
  [_multipartBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

  [_parts removeObjectAtIndex:0];
  if (_parts.count) {
    return [_networker processDataForHTTPQuery:_parts[0] callback:^(NSError *err, NSDictionary<NSString *, id> *res) {
      return [self handleResult:res error:err];
    }];
  }

  // We've processed the last item. Finish and return.
  [_multipartBody appendData:[[NSString stringWithFormat:@"--%@--\r\n", _boundary]
                              dataUsingEncoding:NSUTF8StringEncoding]];
  NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", _boundary];
  return _callback(nil, @{@"body": _multipartBody, @"contentType": contentType});
}

@end

/**
 * Bridge module that provides the JS interface to the network stack.
 */
@implementation RCTNetworking
{
  NSMutableDictionary<NSNumber *, RCTNetworkTask *> *_tasksByRequestID;
  std::mutex _handlersLock;
  NSArray<id<RCTURLRequestHandler>> *_handlers;
  NSMutableArray<id<RCTNetworkingRequestHandler>> *_requestHandlers;
  NSMutableArray<id<RCTNetworkingResponseHandler>> *_responseHandlers;
}

@synthesize methodQueue = _methodQueue;

RCT_EXPORT_MODULE()

- (void)invalidate
{
  _requestHandlers = nil;
  _responseHandlers = nil;
}

- (NSArray<NSString *> *)supportedEvents
{
  return @[@"didCompleteNetworkResponse",
           @"didReceiveNetworkResponse",
           @"didSendNetworkData",
           @"didReceiveNetworkIncrementalData",
           @"didReceiveNetworkDataProgress",
           @"didReceiveNetworkData"];
}

- (id<RCTURLRequestHandler>)handlerForRequest:(NSURLRequest *)request
{
  if (!request.URL) {
    return nil;
  }

  {
    std::lock_guard<std::mutex> lock(_handlersLock);

    if (!_handlers) {
      // Get handlers, sorted in reverse priority order (highest priority first)
      _handlers = [[self.bridge modulesConformingToProtocol:@protocol(RCTURLRequestHandler)] sortedArrayUsingComparator:^NSComparisonResult(id<RCTURLRequestHandler> a, id<RCTURLRequestHandler> b) {
        float priorityA = [a respondsToSelector:@selector(handlerPriority)] ? [a handlerPriority] : 0;
        float priorityB = [b respondsToSelector:@selector(handlerPriority)] ? [b handlerPriority] : 0;
        if (priorityA > priorityB) {
          return NSOrderedAscending;
        } else if (priorityA < priorityB) {
          return NSOrderedDescending;
        } else {
          return NSOrderedSame;
        }
      }];
    }
  }

  if (RCT_DEBUG) {
    // Check for handler conflicts
    float previousPriority = 0;
    id<RCTURLRequestHandler> previousHandler = nil;
    for (id<RCTURLRequestHandler> handler in _handlers) {
      float priority = [handler respondsToSelector:@selector(handlerPriority)] ? [handler handlerPriority] : 0;
      if (previousHandler && priority < previousPriority) {
        return previousHandler;
      }
      if ([handler canHandleRequest:request]) {
        if (previousHandler) {
          if (priority == previousPriority) {
            RCTLogError(@"The RCTURLRequestHandlers %@ and %@ both reported that"
                        " they can handle the request %@, and have equal priority"
                        " (%g). This could result in non-deterministic behavior.",
                        handler, previousHandler, request, priority);
          }
        } else {
          previousHandler = handler;
          previousPriority = priority;
        }
      }
    }
    return previousHandler;
  }

  // Normal code path
  for (id<RCTURLRequestHandler> handler in _handlers) {
    if ([handler canHandleRequest:request]) {
      return handler;
    }
  }
  return nil;
}

- (NSDictionary<NSString *, id> *)stripNullsInRequestHeaders:(NSDictionary<NSString *, id> *)headers
{
  NSMutableDictionary *result = [NSMutableDictionary dictionaryWithCapacity:headers.count];
  for (NSString *key in headers.allKeys) {
    id val = headers[key];
    if (val != [NSNull null]) {
      result[key] = val;
    }
  }

  return result;
}

- (RCTURLRequestCancellationBlock)buildRequest:(NSDictionary<NSString *, id> *)query
                                 completionBlock:(void (^)(NSURLRequest *request))block
{
  RCTAssertThread(_methodQueue, @"buildRequest: must be called on method queue");

  NSURL *URL = [RCTConvert NSURL:query[@"url"]]; // this is marked as nullable in JS, but should not be null
  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
  request.HTTPMethod = [RCTConvert NSString:RCTNilIfNull(query[@"method"])].uppercaseString ?: @"GET";

  // Load and set the cookie header.
  NSArray<NSHTTPCookie *> *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:URL];
  request.allHTTPHeaderFields = [NSHTTPCookie requestHeaderFieldsWithCookies:cookies];

  // Set supplied headers.
  NSDictionary *headers = [RCTConvert NSDictionary:query[@"headers"]];
  [headers enumerateKeysAndObjectsUsingBlock:^(NSString *key, id value, BOOL *stop) {
    if (value) {
      [request addValue:[RCTConvert NSString:value] forHTTPHeaderField:key];
    }
  }];

  request.timeoutInterval = [RCTConvert NSTimeInterval:query[@"timeout"]];
  request.HTTPShouldHandleCookies = [RCTConvert BOOL:query[@"withCredentials"]];
  NSDictionary<NSString *, id> *data = [RCTConvert NSDictionary:RCTNilIfNull(query[@"data"])];
  NSString *trackingName = data[@"trackingName"];
  if (trackingName) {
    [NSURLProtocol setProperty:trackingName
                        forKey:@"trackingName"
                     inRequest:request];
  }
  return [self processDataForHTTPQuery:data callback:^(NSError *error, NSDictionary<NSString *, id> *result) {
    if (error) {
      RCTLogError(@"Error processing request body: %@", error);
      // Ideally we'd circle back to JS here and notify an error/abort on the request.
      return (RCTURLRequestCancellationBlock)nil;
    }
    request.HTTPBody = result[@"body"];
    NSString *dataContentType = result[@"contentType"];
    NSString *requestContentType = [request valueForHTTPHeaderField:@"Content-Type"];
    BOOL isMultipart = [dataContentType hasPrefix:@"multipart"];

    // For multipart requests we need to override caller-specified content type with one
    // from the data object, because it contains the boundary string
    if (dataContentType && ([requestContentType length] == 0 || isMultipart)) {
      [request setValue:dataContentType forHTTPHeaderField:@"Content-Type"];
    }

    // Gzip the request body
    if ([request.allHTTPHeaderFields[@"Content-Encoding"] isEqualToString:@"gzip"]) {
      request.HTTPBody = RCTGzipData(request.HTTPBody, -1 /* default */);
      [request setValue:(@(request.HTTPBody.length)).description forHTTPHeaderField:@"Content-Length"];
    }

    dispatch_async(self->_methodQueue, ^{
      block(request);
    });

    return (RCTURLRequestCancellationBlock)nil;
  }];
}

- (BOOL)canHandleRequest:(NSURLRequest *)request
{
  return [self handlerForRequest:request] != nil;
}

/**
 * Process the 'data' part of an HTTP query.
 *
 * 'data' can be a JSON value of the following forms:
 *
 * - {"string": "..."}: a simple JS string that will be UTF-8 encoded and sent as the body
 *
 * - {"uri": "some-uri://..."}: reference to a system resource, e.g. an image in the asset library
 *
 * - {"formData": [...]}: list of data payloads that will be combined into a multipart/form-data request
 *
 * - {"blob": {...}}: an object representing a blob
 *
 * If successful, the callback be called with a result dictionary containing the following (optional) keys:
 *
 * - @"body" (NSData): the body of the request
 *
 * - @"contentType" (NSString): the content type header of the request
 *
 */
- (RCTURLRequestCancellationBlock)processDataForHTTPQuery:(nullable NSDictionary<NSString *, id> *)query callback:
(RCTURLRequestCancellationBlock (^)(NSError *error, NSDictionary<NSString *, id> *result))callback
{
  RCTAssertThread(_methodQueue, @"processDataForHTTPQuery: must be called on method queue");

  if (!query) {
    return callback(nil, nil);
  }
  for (id<RCTNetworkingRequestHandler> handler in _requestHandlers) {
    if ([handler canHandleNetworkingRequest:query]) {
      // @lint-ignore FBOBJCUNTYPEDCOLLECTION1
      NSDictionary *body = [handler handleNetworkingRequest:query];
      if (body) {
        return callback(nil, body);
      }
    }
  }
  NSData *body = [RCTConvert NSData:query[@"string"]];
  if (body) {
    return callback(nil, @{@"body": body});
  }
  NSString *base64String = [RCTConvert NSString:query[@"base64"]];
  if (base64String) {
    NSData *data = [[NSData alloc] initWithBase64EncodedString:base64String options:0];
    return callback(nil, @{@"body": data});
  }
  NSURLRequest *request = [RCTConvert NSURLRequest:query[@"uri"]];
  if (request) {

    __block RCTURLRequestCancellationBlock cancellationBlock = nil;
    RCTNetworkTask *task = [self networkTaskWithRequest:request completionBlock:^(NSURLResponse *response, NSData *data, NSError *error) {
      dispatch_async(self->_methodQueue, ^{
        cancellationBlock = callback(error, data ? @{@"body": data, @"contentType": RCTNullIfNil(response.MIMEType)} : nil);
      });
    }];

    [task start];

    __weak RCTNetworkTask *weakTask = task;
    return ^{
      [weakTask cancel];
      if (cancellationBlock) {
        cancellationBlock();
      }
    };
  }
  NSArray<NSDictionary *> *formData = [RCTConvert NSDictionaryArray:query[@"formData"]];
  if (formData) {
    RCTHTTPFormDataHelper *formDataHelper = [RCTHTTPFormDataHelper new];
    formDataHelper.networker = self;
    return [formDataHelper process:formData callback:callback];
  }
  // Nothing in the data payload, at least nothing we could understand anyway.
  // Ignore and treat it as if it were null.
  return callback(nil, nil);
}

+ (NSString *)decodeTextData:(NSData *)data fromResponse:(NSURLResponse *)response withCarryData:(NSMutableData *)inputCarryData
{
  NSStringEncoding encoding = NSUTF8StringEncoding;
  if (response.textEncodingName) {
    CFStringEncoding cfEncoding = CFStringConvertIANACharSetNameToEncoding((CFStringRef)response.textEncodingName);
    encoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding);
  }

  NSMutableData *currentCarryData = inputCarryData ?: [NSMutableData new];
  [currentCarryData appendData:data];

  // Attempt to decode text
  NSString *encodedResponse = [[NSString alloc] initWithData:currentCarryData encoding:encoding];

  if (!encodedResponse && data.length > 0) {
    if (encoding == NSUTF8StringEncoding && inputCarryData) {
      // If decode failed, we attempt to trim broken character bytes from the data.
      // At this time, only UTF-8 support is enabled. Multibyte encodings, such as UTF-16 and UTF-32, require a lot of additional work
      // to determine wether BOM was included in the first data packet. If so, save it, and attach it to each new data packet. If not,
      // an encoding has to be selected with a suitable byte order (for ARM iOS, it would be little endianness).

      CFStringEncoding cfEncoding = CFStringConvertNSStringEncodingToEncoding(encoding);
      // Taking a single unichar is not good enough, due to Unicode combining character sequences or characters outside the BMP.
      // See https://www.objc.io/issues/9-strings/unicode/#common-pitfalls
      // We'll attempt with a sequence of two characters, the most common combining character sequence and characters outside the BMP (emojis).
      CFIndex maxCharLength = CFStringGetMaximumSizeForEncoding(2, cfEncoding);

      NSUInteger removedBytes = 1;

      while (removedBytes < maxCharLength) {
        encodedResponse = [[NSString alloc] initWithData:[currentCarryData subdataWithRange:NSMakeRange(0, currentCarryData.length - removedBytes)]
                                                encoding:encoding];

        if (encodedResponse != nil) {
          break;
        }

        removedBytes += 1;
      }
    } else {
      // We don't have an encoding, or the encoding is incorrect, so now we try to guess
      [NSString stringEncodingForData:data
                      encodingOptions:@{ NSStringEncodingDetectionSuggestedEncodingsKey: @[ @(encoding) ] }
                      convertedString:&encodedResponse
                  usedLossyConversion:NULL];
    }
  }

  if (inputCarryData) {
    NSUInteger encodedResponseLength = [encodedResponse dataUsingEncoding:encoding].length;

    // Ensure a valid subrange exists within currentCarryData
    if (currentCarryData.length >= encodedResponseLength) {
      NSData *newCarryData = [currentCarryData subdataWithRange:NSMakeRange(encodedResponseLength, currentCarryData.length - encodedResponseLength)];
      [inputCarryData setData:newCarryData];
    } else {
      [inputCarryData setLength:0];
    }
  }

  return encodedResponse;
}

- (void)sendData:(NSData *)data
    responseType:(NSString *)responseType
        response:(NSURLResponse *)response
         forTask:(RCTNetworkTask *)task
{
  RCTAssertThread(_methodQueue, @"sendData: must be called on method queue");

  id responseData = nil;
  for (id<RCTNetworkingResponseHandler> handler in _responseHandlers) {
    if ([handler canHandleNetworkingResponse:responseType]) {
      responseData = [handler handleNetworkingResponse:response data:data];
      break;
    }
  }

  if (!responseData) {
    if (data.length == 0) {
      return;
    }

    if ([responseType isEqualToString:@"text"]) {
      // No carry storage is required here because the entire data has been loaded.
      responseData = [RCTNetworking decodeTextData:data fromResponse:task.response withCarryData:nil];
      if (!responseData) {
        RCTLogWarn(@"Received data was not a string, or was not a recognised encoding.");
        return;
      }
    } else if ([responseType isEqualToString:@"base64"]) {
      responseData = [data base64EncodedStringWithOptions:0];
    } else {
      RCTLogWarn(@"Invalid responseType: %@", responseType);
      return;
    }
  }

  [self sendEventWithName:@"didReceiveNetworkData" body:@[task.requestID, responseData]];
}

- (void)sendRequest:(NSURLRequest *)request
       responseType:(NSString *)responseType
 incrementalUpdates:(BOOL)incrementalUpdates
     responseSender:(RCTResponseSenderBlock)responseSender
{
  RCTAssertThread(_methodQueue, @"sendRequest: must be called on method queue");
  __weak __typeof(self) weakSelf = self;
  __block RCTNetworkTask *task;
  RCTURLRequestProgressBlock uploadProgressBlock = ^(int64_t progress, int64_t total) {
    NSArray *responseJSON = @[task.requestID, @((double)progress), @((double)total)];
    [weakSelf sendEventWithName:@"didSendNetworkData" body:responseJSON];
  };

  RCTURLRequestResponseBlock responseBlock = ^(NSURLResponse *response) {
    NSDictionary<NSString *, NSString *> *headers;
    NSInteger status;
    if ([response isKindOfClass:[NSHTTPURLResponse class]]) { // Might be a local file request
      NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
      headers = httpResponse.allHeaderFields ?: @{};
      status = httpResponse.statusCode;
    } else {
      headers = response.MIMEType ? @{@"Content-Type": response.MIMEType} : @{};
      status = 200;
    }
    id responseURL = response.URL ? response.URL.absoluteString : [NSNull null];
    NSArray<id> *responseJSON = @[task.requestID, @(status), headers, responseURL];
    [weakSelf sendEventWithName:@"didReceiveNetworkResponse" body:responseJSON];
  };

  // XHR does not allow you to peek at xhr.response before the response is
  // finished. Only when xhr.responseType is set to ''/'text', consumers may
  // peek at xhr.responseText. So unless the requested responseType is 'text',
  // we only send progress updates and not incremental data updates to JS here.
  RCTURLRequestIncrementalDataBlock incrementalDataBlock = nil;
  RCTURLRequestProgressBlock downloadProgressBlock = nil;
  if (incrementalUpdates) {
    if ([responseType isEqualToString:@"text"]) {

      // We need this to carry over bytes, which could not be decoded into text (such as broken UTF-8 characters).
      // The incremental data block holds the ownership of this object, and will be released upon release of the block.
      NSMutableData *incrementalDataCarry = [NSMutableData new];

      incrementalDataBlock = ^(NSData *data, int64_t progress, int64_t total) {
        NSUInteger initialCarryLength = incrementalDataCarry.length;

        NSString *responseString = [RCTNetworking decodeTextData:data
                                                    fromResponse:task.response
                                                   withCarryData:incrementalDataCarry];
        if (!responseString) {
          RCTLogWarn(@"Received data was not a string, or was not a recognised encoding.");
          return;
        }

        // Update progress to include the previous carry length and reduce the current carry length.
        NSArray<id> *responseJSON = @[task.requestID,
                                      responseString,
                                      @(progress + initialCarryLength - incrementalDataCarry.length),
                                      @(total)];

        [weakSelf sendEventWithName:@"didReceiveNetworkIncrementalData" body:responseJSON];
      };
    } else {
      downloadProgressBlock = ^(int64_t progress, int64_t total) {
        NSArray<id> *responseJSON = @[task.requestID, @(progress), @(total)];
        [weakSelf sendEventWithName:@"didReceiveNetworkDataProgress" body:responseJSON];
      };
    }
  }

  RCTURLRequestCompletionBlock completionBlock =
  ^(NSURLResponse *response, NSData *data, NSError *error) {
    __typeof(self) strongSelf = weakSelf;
    if (!strongSelf) {
      return;
    }

    // Unless we were sending incremental (text) chunks to JS, all along, now
    // is the time to send the request body to JS.
    if (!(incrementalUpdates && [responseType isEqualToString:@"text"])) {
      [strongSelf sendData:data
              responseType:responseType
                  response:response
                   forTask:task];
    }
    NSArray *responseJSON = @[task.requestID,
                              RCTNullIfNil(error.localizedDescription),
                              error.code == kCFURLErrorTimedOut ? @YES : @NO
                              ];

    [strongSelf sendEventWithName:@"didCompleteNetworkResponse" body:responseJSON];
    [strongSelf->_tasksByRequestID removeObjectForKey:task.requestID];
  };

  task = [self networkTaskWithRequest:request completionBlock:completionBlock];
  task.downloadProgressBlock = downloadProgressBlock;
  task.incrementalDataBlock = incrementalDataBlock;
  task.responseBlock = responseBlock;
  task.uploadProgressBlock = uploadProgressBlock;

  if (task.requestID) {
    if (!_tasksByRequestID) {
      _tasksByRequestID = [NSMutableDictionary new];
    }
    _tasksByRequestID[task.requestID] = task;
    responseSender(@[task.requestID]);
  }

  [task start];
}

#pragma mark - Public API

- (void)addRequestHandler:(id<RCTNetworkingRequestHandler>)handler
{
  if (!_requestHandlers) {
    _requestHandlers = [NSMutableArray new];
  }
  [_requestHandlers addObject:handler];
}

- (void)addResponseHandler:(id<RCTNetworkingResponseHandler>)handler
{
  if (!_responseHandlers) {
    _responseHandlers = [NSMutableArray new];
  }
  [_responseHandlers addObject:handler];
}

- (void)removeRequestHandler:(id<RCTNetworkingRequestHandler>)handler
{
  [_requestHandlers removeObject:handler];
}

- (void)removeResponseHandler:(id<RCTNetworkingResponseHandler>)handler
{
  [_responseHandlers removeObject:handler];
}

- (RCTNetworkTask *)networkTaskWithRequest:(NSURLRequest *)request completionBlock:(RCTURLRequestCompletionBlock)completionBlock
{
  id<RCTURLRequestHandler> handler = [self handlerForRequest:request];
  if (!handler) {
    RCTLogError(@"No suitable URL request handler found for %@", request.URL);
    return nil;
  }

  RCTNetworkTask *task = [[RCTNetworkTask alloc] initWithRequest:request
                                                         handler:handler
                                                   callbackQueue:_methodQueue];
  task.completionBlock = completionBlock;
  return task;
}

#pragma mark - JS API

RCT_EXPORT_METHOD(sendRequest:(NSDictionary *)query
                  responseSender:(RCTResponseSenderBlock)responseSender)
{
  // TODO: buildRequest returns a cancellation block, but there's currently
  // no way to invoke it, if, for example the request is cancelled while
  // loading a large file to build the request body
  [self buildRequest:query completionBlock:^(NSURLRequest *request) {
    NSString *responseType = [RCTConvert NSString:query[@"responseType"]];
    BOOL incrementalUpdates = [RCTConvert BOOL:query[@"incrementalUpdates"]];
    [self sendRequest:request
         responseType:responseType
   incrementalUpdates:incrementalUpdates
       responseSender:responseSender];
  }];
}

RCT_EXPORT_METHOD(abortRequest:(nonnull NSNumber *)requestID)
{
  [_tasksByRequestID[requestID] cancel];
  [_tasksByRequestID removeObjectForKey:requestID];
}

RCT_EXPORT_METHOD(clearCookies:(RCTResponseSenderBlock)responseSender)
{
  NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
  if (!storage.cookies.count) {
    responseSender(@[@NO]);
    return;
  }

  for (NSHTTPCookie *cookie in storage.cookies) {
    [storage deleteCookie:cookie];
  }
  responseSender(@[@YES]);
}

@end

@implementation RCTBridge (RCTNetworking)

- (RCTNetworking *)networking
{
  return [self moduleForClass:[RCTNetworking class]];
}

@end