最近、NSURLProtocol を MPMoviePlayerController で動作させることができました。MPMoviePlayerController は NSURL のみを受け入れるため、Cookie やヘッダー (認証用) を渡すことができないため、これは主に便利です。NSURLProtocol を使用すると、それが可能になりました。ここで、コミュニティのためにいくつかのコードを一度共有したいと思いました。
基本的に、NSURLProtocol を使用することで、MPMoviePlayerController とストリーミングされたリクエストの間の通信をインターセプトして、途中で Cookie を挿入したり、ストリームをオフラインで保存したり、猫の動画などに置き換えたりすることができます...これを行うには、作成する必要があります新しいクラス My 拡張 NSURLProtocol:
MyURLProtocol.h:
#import <Foundation/Foundation.h>
@interface MyURLProtocol : NSURLProtocol
+ (void) register;
+ (void) injectURL:(NSString*) urlString cookie:(NSString*)cookie;
@end
MyURLProtocol.m:
#import "MyURLProtocol.h"
@interface MyURLProtocol() <NSURLConnectionDelegate> {
NSMutableURLRequest* myRequest;
NSURLConnection * connection;
}
@end
static NSString* injectedURL = nil;
static NSString* myCookie = nil;
@implementation MyURLProtocol
// register the class to intercept all HTTP calls
+ (void) register
{
[NSURLProtocol registerClass:[self class]];
}
// public static function to call when injecting a cookie
+ (void) injectURL:(NSString*) urlString cookie:(NSString*)cookie
{
injectedURL = urlString;
myCookie = cookie;
}
// decide whether or not the call should be intercepted
+ (BOOL)canInitWithRequest:(NSURLRequest *)request {
if([[[request allHTTPHeaderFields] objectForKey:@"BANANA"] isEqualToString:@"DELICIOUS"])
{
return NO;
}
return [[[request URL] absoluteString] isEqualToString:injectedURL];
}
// required (don't know what this means)
+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
return request;
}
// intercept the request and handle it yourself
- (id)initWithRequest:(NSURLRequest *)request cachedResponse:(NSCachedURLResponse *)cachedResponse client:(id<NSURLProtocolClient>)client {
if (self = [super initWithRequest:request cachedResponse:cachedResponse client:client]) {
myRequest = request.mutableCopy;
[myRequest setValue:@"DELICIOUS" forHTTPHeaderField:@"BANANA"]; // add your own signature to the request
}
return self;
}
// load the request
- (void)startLoading {
// inject your cookie
[myRequest setValue:myCookie forHTTPHeaderField:@"Cookie"];
connection = [[NSURLConnection alloc] initWithRequest:myRequest delegate:self];
}
// overload didReceive data
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[[self client] URLProtocol:self didLoadData:data];
}
// overload didReceiveResponse
- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse *)response {
[[self client] URLProtocol:self didReceiveResponse:response cacheStoragePolicy:[myRequest cachePolicy]];
}
// overload didFinishLoading
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[[self client] URLProtocolDidFinishLoading:self];
}
// overload didFail
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[[self client] URLProtocol:self didFailWithError:error];
}
// handle load cancelation
- (void)stopLoading {
[connection cancel];
}
@end
利用方法:
[MyURLProtocol register];
[MyURLProtocol injectURL:@"http://server/your-video-url.mp4" cookie:@"mycookie=123"];
MPMoviePlayerController* moviePlayer = [[MPMoviePlayerController alloc]initWithContentURL:@"http://server/your-video-url.mp4"];
[moviePlayer play];