/* File: JAHPAuthenticatingHTTPProtocol.h Abstract: An NSURLProtocol subclass that overrides the built-in HTTP/HTTPS protocol. Version: 1.1 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc. ("Apple") in consideration of your agreement to the following terms, and your use, installation, modification or redistribution of this Apple software constitutes acceptance of these terms. If you do not agree with these terms, please do not use, install, modify or redistribute this Apple software. 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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Copyright (C) 2014 Apple Inc. All Rights Reserved. */ @import Foundation; @protocol JAHPAuthenticatingHTTPProtocolDelegate; /*! An NSURLProtocol subclass that overrides the built-in HTTP/HTTPS protocol to intercept * authentication challenges for subsystems, ilke UIWebView, that don't otherwise allow it. * To use this class you should set up your delegate (+setDelegate:) and then call +start. * If you don't call +start the class is completely benign. * * The really tricky stuff here is related to the authentication challenge delegate * callbacks; see the docs for JAHPAuthenticatingHTTPProtocolDelegate for the details. */ @interface JAHPAuthenticatingHTTPProtocol : NSURLProtocol /*! Call this to start the module. Prior to this the module is just dormant, and * all HTTP requests proceed as normal. After this all HTTP and HTTPS requests * go through this module. */ + (void)start; /*! Unregisters the protocol */ + (void)stop; /*! Sets the delegate for the class. * \details Note that there's one delegate for the entire class, not one per * instance of the class as is more normal. The delegate is not retained in general, * but is retained for the duration of any given call. Once you set the delegate to nil * you can be assured that it won't be called unretained (that is, by the time that * -setDelegate: returns, we've already done all possible retains on the delegate). * * The delegate is weakly referenced, so there's no risk of a crash if you don't * explicitly nil it. * \param newValue The new delegate to use; may be nil. */ + (void)setDelegate:(nullable id)newValue; /*! Returns the class delegate. */ + (nullable id)delegate; /*! Sets the user agent token * \details This token is appended to the system default user agent. */ + (void)setUserAgentToken:(nullable NSString *)userAgentToken; /*! Returns the user agent token. */ + (nullable NSString *)userAgentToken; + (void)resetSharedDemux; @property (atomic, strong, readonly) NSURLAuthenticationChallenge * __nullable pendingChallenge; ///< The current authentication challenge; it's only safe to access this from the main thread. /*! Call this method to resolve an authentication challeng. This must be called on the main thread. * \param challenge The challenge to resolve. This must match the pendingChallenge property. * \param credential The credential to use, or nil to continue without a credential. */ - (void)resolvePendingAuthenticationChallengeWithCredential:(nonnull NSURLCredential *)credential; - (void)cancelPendingAuthenticationChallenge; @end /*! The delegate for the JAHPAuthenticatingHTTPProtocol class (not its instances). * \details The delegate handles two different types of callbacks: * * - authentication challenges * * - logging * * The latter is very simple. The former is quite tricky. The basic idea is that each JAHPAuthenticatingHTTPProtocol * instance sends the delegate a serialised stream of authentication challenges, each of which it is * expected to resolve. The sequence is as follows: * * -# It calls -authenticatingHTTPProtocol:canAuthenticateAgainstProtectionSpace: to determine if the delegate * can handle the challenge. This can be call on an arbitrary background thread. * * -# If the delegate returns YES, it calls -authenticatingHTTPProtocol:didReceiveAuthenticationChallenge: to * actually process the challenge. This is always called on the main thread. The delegate can resolve * the challenge synchronously (that is, before returning from the call) or it can return from the call * and then, later on, resolve the challenge. Resolving the challenge involves calling * -[JAHPAuthenticatingHTTPProtocol resolveAuthenticationChallenge:withCredential:], which also must be called * on the main thread. Between the calls to -authenticatingHTTPProtocol:didReceiveAuthenticationChallenge: * and -[JAHPAuthenticatingHTTPProtocol resolveAuthenticationChallenge:withCredential:], the protocol's * pendingChallenge property will contain the challenge. * * -# While there is a pending challenge, the protocol may call -authenticatingHTTPProtocol:didCancelAuthenticationChallenge: * to cancel the challenge. This is always called on the main thread. * * Note that this design follows the original NSURLConnection model, not the newer NSURLConnection model * (introduced in OS X 10.7 / iOS 5) or the NSURLSession model, because of my concerns about performance. * Specifically, -authenticatingHTTPProtocol:canAuthenticateAgainstProtectionSpace: can be called on any thread * but -authenticatingHTTPProtocol:didReceiveAuthenticationChallenge: is called on the main thread. If I unified * them I'd end up calling the resulting single routine on the main thread, which meanings a lot more * bouncing between threads, much of which would be pointless in the common case where you don't want to * customise the default behaviour. Alternatively I could call the unified routine on an arbitrary thread, * but that would make it harder for clients and require a major rework of my implementation. */ typedef void (^JAHPDidCancelAuthenticationChallengeHandler)(JAHPAuthenticatingHTTPProtocol * __nonnull authenticatingHTTPProtocol, NSURLAuthenticationChallenge * __nonnull challenge); @protocol JAHPAuthenticatingHTTPProtocolDelegate @optional /*! Called by an JAHPAuthenticatingHTTPProtocol instance to ask the delegate whether it's prepared to handle * a particular authentication challenge. Can be called on any thread. * \param protocol The protocol instance itself; will not be nil. * \param protectionSpace The protection space for the authentication challenge; will not be nil. * \returns Return YES if you want the -authenticatingHTTPProtocol:didReceiveAuthenticationChallenge: delegate * callback, or NO for the challenge to be handled in the default way. */ - (BOOL)authenticatingHTTPProtocol:(nonnull JAHPAuthenticatingHTTPProtocol *)authenticatingHTTPProtocol canAuthenticateAgainstProtectionSpace:(nonnull NSURLProtectionSpace *)protectionSpace; /*! Called by an JAHPAuthenticatingHTTPProtocol instance to request that the delegate process on authentication * challenge. Will be called on the main thread. Unless the challenge is cancelled (see below) * the delegate must eventually resolve it by calling -resolveAuthenticationChallenge:withCredential:. * \param protocol The protocol instance itself; will not be nil. * \param challenge The authentication challenge; will not be nil. * \returns an optional JAHPDidCancelAuthenticationChallengeHandler that will be called when the * JAHPAuthenticatingHTTPProtocol instance cancels the authentication challenge. Just like * -authenticatingHTTPProtocol:didCancelAuthenticationChallenge:. If this is returned, there is usually no need * to implement -authenticatingHTTPProtocol:didCancelAuthenticationChallenge:. This block will be called before * -authenticatingHTTPProtocol:didCancelAuthenticationChallenge:. */ - (nullable JAHPDidCancelAuthenticationChallengeHandler)authenticatingHTTPProtocol:(nonnull JAHPAuthenticatingHTTPProtocol *)authenticatingHTTPProtocol didReceiveAuthenticationChallenge:(nonnull NSURLAuthenticationChallenge *)challenge; /*! Called by an JAHPAuthenticatingHTTPProtocol instance to cancel an issued authentication challenge. * Will be called on the main thread. * \param protocol The protocol instance itself; will not be nil. * \param challenge The authentication challenge; will not be nil; will match the challenge * previously issued by -authenticatingHTTPProtocol:canAuthenticateAgainstProtectionSpace:. */ - (void)authenticatingHTTPProtocol:(nonnull JAHPAuthenticatingHTTPProtocol *)authenticatingHTTPProtocol didCancelAuthenticationChallenge:(nonnull NSURLAuthenticationChallenge *)challenge; /*! Called by the JAHPAuthenticatingHTTPProtocol to log various bits of information. * Can be called on any thread. * \param protocol The protocol instance itself; nil to indicate log messages from the class itself. * \param format A standard NSString-style format string; will not be nil. * \param arguments Arguments for that format string. */ - (void)authenticatingHTTPProtocol:(nullable JAHPAuthenticatingHTTPProtocol *)authenticatingHTTPProtocol logWithFormat:(nonnull NSString *)format // clang's static analyzer doesn't know that a va_list can't have an nullability annotation. #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wnullability-completeness" arguments:(va_list)arguments; #pragma clang diagnostic pop /*! Called by the JAHPAuthenticatingHTTPProtocol to log various bits of information. Use this if implementing in Swift. Swift doesn't like * -authenticatingHTTPProtocol:logWithFormat:arguments: because * `Method cannot be marked @objc because the type of the parameter 3 cannot be represented in Objective-C` * I assume this is a problem with Swift not understanding that CVAListPointer should become va_list. * Can be called on any thread. * \param protocol The protocol instance itself; nil to indicate log messages from the class itself. * \param message A message to log */ - (void)authenticatingHTTPProtocol:(nullable JAHPAuthenticatingHTTPProtocol *)authenticatingHTTPProtocol logMessage:(nonnull NSString *)message; @end