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Add multipart response download task (2nd edition)
Reviewed By: mmmulani Differential Revision: D3976605 fbshipit-source-id: c15cc859aa1288e831f70256566f743f4a8d9cd2
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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. | ||
| */ | ||
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| #import <Foundation/Foundation.h> | ||
| #import "RCTMultipartStreamReader.h" | ||
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| typedef void (^RCTMultipartDataTaskCallback)(NSInteger statusCode, NSDictionary *headers, NSData *content, NSError *error, BOOL done); | ||
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| @interface RCTMultipartDataTask : NSObject | ||
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| - (instancetype)initWithURL:(NSURL *)url partHandler:(RCTMultipartDataTaskCallback)partHandler; | ||
| - (void)startTask; | ||
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| @end |
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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. | ||
| */ | ||
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| #import "RCTMultipartDataTask.h" | ||
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| @interface RCTMultipartDataTask () <NSURLSessionDataDelegate, NSURLSessionDataDelegate> | ||
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| @end | ||
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| // We need this ugly runtime check because [streamTask captureStreams] below fails on iOS version | ||
| // earlier than 9.0. Unfortunately none of the proper ways of checking worked: | ||
| // | ||
| // - NSURLSessionStreamTask class is available and is not Null on iOS 8 | ||
| // - [[NSURLSessionStreamTask new] respondsToSelector:@selector(captureStreams)] is always NO | ||
| // - The instance we get in URLSession:dataTask:didBecomeStreamTask: is of __NSCFURLLocalStreamTaskFromDataTask | ||
| // and it responds to captureStreams on iOS 9+ but doesn't on iOS 8. Which means we can't get direct access | ||
| // to the streams on iOS 8 and at that point it's too late to change the behavior back to dataTask | ||
| // - The compile-time #ifdef's can't be used because an app compiled for iOS8 can still run on iOS9 | ||
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| static BOOL isStreamTaskSupported() { | ||
| return [[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){9,0,0}]; | ||
| } | ||
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| @implementation RCTMultipartDataTask { | ||
| NSURL *_url; | ||
| RCTMultipartDataTaskCallback _partHandler; | ||
| NSInteger _statusCode; | ||
| NSDictionary *_headers; | ||
| NSString *_boundary; | ||
| NSMutableData *_data; | ||
| } | ||
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| - (instancetype)initWithURL:(NSURL *)url partHandler:(RCTMultipartDataTaskCallback)partHandler | ||
| { | ||
| if (self = [super init]) { | ||
| _url = url; | ||
| _partHandler = [partHandler copy]; | ||
| } | ||
| return self; | ||
| } | ||
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| - (void)startTask | ||
| { | ||
| NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] | ||
| delegate:self delegateQueue:nil]; | ||
| NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:_url]; | ||
| if (isStreamTaskSupported()) { | ||
| [request addValue:@"multipart/mixed" forHTTPHeaderField:@"Accept"]; | ||
| } | ||
| NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request]; | ||
| [dataTask resume]; | ||
| } | ||
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| - (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler | ||
| { | ||
| if ([response isKindOfClass:[NSHTTPURLResponse class]]) { | ||
| NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response; | ||
| _headers = [httpResponse allHeaderFields]; | ||
| _statusCode = [httpResponse statusCode]; | ||
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| NSString *contentType = @""; | ||
| for (NSString *key in [_headers keyEnumerator]) { | ||
| if ([[key lowercaseString] isEqualToString:@"content-type"]) { | ||
| contentType = [_headers valueForKey:key]; | ||
| break; | ||
| } | ||
| } | ||
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| NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"multipart/mixed;.*boundary=\"([^\"]+)\"" options:0 error:nil]; | ||
| NSTextCheckingResult *match = [regex firstMatchInString:contentType options:0 range:NSMakeRange(0, contentType.length)]; | ||
| if (match) { | ||
| _boundary = [contentType substringWithRange:[match rangeAtIndex:1]]; | ||
| completionHandler(NSURLSessionResponseBecomeStream); | ||
| return; | ||
| } | ||
| } | ||
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| // In case the server doesn't support multipart/mixed responses, fallback to normal download | ||
| _data = [[NSMutableData alloc] initWithCapacity:1024 * 1024]; | ||
| completionHandler(NSURLSessionResponseAllow); | ||
| } | ||
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| - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error | ||
| { | ||
| _partHandler(_statusCode, _headers, _data, error, YES); | ||
| } | ||
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| - (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data | ||
| { | ||
| [_data appendData:data]; | ||
| } | ||
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| - (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didBecomeStreamTask:(NSURLSessionStreamTask *)streamTask | ||
| { | ||
| [streamTask captureStreams]; | ||
| } | ||
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| - (void)URLSession:(NSURLSession *)session streamTask:(NSURLSessionStreamTask *)streamTask didBecomeInputStream:(NSInputStream *)inputStream outputStream:(NSOutputStream *)outputStream | ||
| { | ||
| RCTMultipartStreamReader *reader = [[RCTMultipartStreamReader alloc] initWithInputStream:inputStream boundary:_boundary]; | ||
| RCTMultipartDataTaskCallback partHandler = _partHandler; | ||
| NSInteger statusCode = _statusCode; | ||
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| BOOL completed = [reader readAllParts:^(NSDictionary *headers, NSData *content, BOOL done) { | ||
| partHandler(statusCode, headers, content, nil, done); | ||
| }]; | ||
| if (!completed) { | ||
| partHandler(statusCode, nil, nil, [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorCancelled userInfo:nil], YES); | ||
| } | ||
| } | ||
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| @end |
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