2 File: CustomHTTPProtocol.h
3 Abstract: An NSURLProtocol subclass that overrides the built-in HTTP/HTTPS protocol.
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48 #import <Foundation/Foundation.h>
50 @protocol CustomHTTPProtocolDelegate;
52 @interface CustomHTTPProtocol : NSURLProtocol
54 // Subclass specific additions
57 // Call this to start the module. Prior to this the module is just dormant, and
58 // all HTTP requests proceed as normal. After this all HTTP and HTTPS requests
59 // go through this module.
61 // The delegate is not retained in general, but is retained for the duration of any given
62 // call. Once you set the delegate to nil you can be assured that it won't be called
63 // unretained (that is, by the time that -setDelegate: returns, we've already done
64 // all possible retains on the delegate).
66 + (id<CustomHTTPProtocolDelegate>)delegate;
67 + (void)setDelegate:(id<CustomHTTPProtocolDelegate>)newValue;
69 @property (atomic, retain, readonly ) NSURLAuthenticationChallenge * pendingChallenge; // main thread only please
71 - (void)resolveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge withCredential:(NSURLCredential *)credential;
72 // must be called on the main thread
73 // credential may be nil, to continue the request without a credential
78 The delegate handles two different types of callbacks:
80 o authentication challenges
83 The latter is very simple. The former is quite tricky. The basic idea is that each CustomHTTPProtocol
84 sends the delegate a serialised stream of authentication challenges, each of which it is expected to
85 resolve. The sequence is as follows:
87 1. It calls -customHTTPProtocol:canAuthenticateAgainstProtectionSpace: to determine if your delegate
88 can handle the challenge. This can be call on an arbitrary background thread.
90 2. If the delegate returns YES, it calls -customHTTPProtocol:didReceiveAuthenticationChallenge: to
91 actually process the challenge. This is always called on the main thread. The delegate can resolve
92 the challenge synchronously (that is, before returning from the call) or it can return from the call
93 and then, later on, resolve the challenge. Resolving the challenge involves calling
94 -[CustomHTTPProtocol resolveAuthenticationChallenge:withCredential:], which also must be called
95 on the main thread. Between the calls to -customHTTPProtocol:didReceiveAuthenticationChallenge:
96 and -[CustomHTTPProtocol resolveAuthenticationChallenge:withCredential:], the protocol's
97 pendingChallenge property will contain the challenge.
99 3. While there is a pending challenge, the protocol may call -customHTTPProtocol:didCancelAuthenticationChallenge:
100 to cancel the challenge. This is always called on the main thread.
103 @protocol CustomHTTPProtocolDelegate <NSObject>
107 - (BOOL)customHTTPProtocol:(CustomHTTPProtocol *)protocol canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace;
108 // called on an arbitrary thread
109 // protocol will not be nil
110 // protectionSpace will not be nil
112 - (void)customHTTPProtocol:(CustomHTTPProtocol *)protocol didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
113 // called on the main thread
114 // protocol will not be nil
115 // challenge will not be nil
117 - (void)customHTTPProtocol:(CustomHTTPProtocol *)protocol didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
118 // called on the main thread
119 // protocol will not be nil
120 // challenge will not be nil
122 - (void)customHTTPProtocol:(CustomHTTPProtocol *)protocol didRecieveResponse:(NSURLResponse *)response;
123 - (void)customHTTPProtocol:(CustomHTTPProtocol *)protocol didRecieveData:(NSData *)data;
124 - (void)customHTTPProtocolDidFinishLoading:(CustomHTTPProtocol *)protocol;
125 - (void)customHTTPProtocol:(CustomHTTPProtocol *)protocol didFailWithError:(NSError *)error;
128 - (void)customHTTPProtocol:(CustomHTTPProtocol *)protocol logWithFormat:(NSString *)format arguments:(va_list)argList;
129 // called on an arbitrary thread
130 // protocol may be nil, implying a log message from the class itself
131 // format will not be nil