react-native/Libraries/Network/RCTNetworking.mm

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/**
* 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;
}
@synthesize methodQueue = _methodQueue;
RCT_EXPORT_MODULE()
- (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";
request.allHTTPHeaderFields = [self stripNullsInRequestHeaders:[RCTConvert NSDictionary:query[@"headers"]]];
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
*
* 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);
}
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;
NSData *newCarryData = [currentCarryData subdataWithRange:NSMakeRange(encodedResponseLength, currentCarryData.length - encodedResponseLength)];
[inputCarryData setData:newCarryData];
}
return encodedResponse;
}
- (void)sendData:(NSData *)data
responseType:(NSString *)responseType
forTask:(RCTNetworkTask *)task
{
RCTAssertThread(_methodQueue, @"sendData: must be called on method queue");
if (data.length == 0) {
return;
}
NSString *responseString;
if ([responseType isEqualToString:@"text"]) {
// No carry storage is required here because the entire data has been loaded.
responseString = [RCTNetworking decodeTextData:data fromResponse:task.response withCarryData:nil];
if (!responseString) {
RCTLogWarn(@"Received data was not a string, or was not a recognised encoding.");
return;
}
} else if ([responseType isEqualToString:@"base64"]) {
responseString = [data base64EncodedStringWithOptions:0];
} else {
RCTLogWarn(@"Invalid responseType: %@", responseType);
return;
}
NSArray<id> *responseJSON = @[task.requestID, responseString];
[self sendEventWithName:@"didReceiveNetworkData" body:responseJSON];
}
- (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 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
- (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