react-native/Libraries/Image/RCTImageRequestHandler.m
Nick Lockwood f88bc3eb73 [ReactNative] Refactor RCTDataManager to support pluggable data source modules (RCTURLRequestHandlers)
Summary:
@public

This is a refactor of @philikon's original diff that decouples the dependencies between the Network and Image modules, and replaces RCTDataQueryExecutor with a more useful abstraction.

I've introduced the RCTURLRequestHandler protocol, which is a new type of bridge module used for loading data using an NSURLRequest. RCTURLRequestHandlers can be registered using RCT_EXPORT_MODULE() and are then available at runtime for use by the RCTDataManager, which will automatically select the appropriate handler for a given request based on the handler's self-reported capabilities.

The currently implemented handlers are:

- RCTHTTPRequestHandler - the standard open source HTTP request handler that uses NSURLSession
- RKHTTPRequestHandler - the internal FB HTTP request handler that uses FBNetworking
- RCTImageRequestHandler - a handler for loading local images from the iOS asset-library

Depends on D2108193

Test Plan:
- Internal apps still work
- OSS port still compiles, Movies app and a sample Parse app still work
- uploading image to Parse using the above code snippet works
- tested `FormData` with string and image parameters using http://www.posttestserver.com/
2015-06-09 12:27:06 -08:00

63 lines
1.7 KiB
Objective-C

//
// RCTImageRequestHandler.m
// RCTImage
//
// Created by Nick Lockwood on 09/06/2015.
// Copyright (c) 2015 Facebook. All rights reserved.
//
#import "RCTImageRequestHandler.h"
#import <UIKit/UIKit.h>
#import "RCTImageLoader.h"
#import "RCTUtils.h"
@implementation RCTImageRequestHandler
{
NSInteger _currentToken;
}
RCT_EXPORT_MODULE()
- (BOOL)canHandleRequest:(NSURLRequest *)request
{
return [@[@"assets-library", @"ph"] containsObject:[request.URL.scheme lowercaseString]];
}
- (id)sendRequest:(NSURLRequest *)request
withDelegate:(id<RCTURLRequestDelegate>)delegate
{
NSNumber *requestToken = @(++_currentToken);
NSString *URLString = [request.URL absoluteString];
[RCTImageLoader loadImageWithTag:URLString callback:^(NSError *error, UIImage *image) {
if (error) {
[delegate URLRequest:requestToken didCompleteWithError:error];
return;
}
NSString *mimeType = nil;
NSData *imageData = nil;
if (RCTImageHasAlpha(image.CGImage)) {
mimeType = @"image/png";
imageData = UIImagePNGRepresentation(image);
} else {
mimeType = @"image/jpeg";
imageData = UIImageJPEGRepresentation(image, 1.0);
}
NSURLResponse *response = [[NSURLResponse alloc] initWithURL:request.URL
MIMEType:mimeType
expectedContentLength:imageData.length
textEncodingName:nil];
[delegate URLRequest:requestToken didReceiveResponse:response];
[delegate URLRequest:requestToken didReceiveData:imageData];
[delegate URLRequest:requestToken didCompleteWithError:nil];
}];
return requestToken;
}
@end