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GTMHTTPFetcher.m
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GTMHTTPFetcher.m
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/* Copyright (c) 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
// GTMHTTPFetcher.m
//
#define GTMHTTPFETCHER_DEFINE_GLOBALS 1
#import "GTMHTTPFetcher.h"
#if GTM_BACKGROUND_FETCHING
#import <UIKit/UIKit.h>
#endif
static id <GTMCookieStorageProtocol> gGTMFetcherStaticCookieStorage = nil;
static Class gGTMFetcherConnectionClass = nil;
// The default max retry interview is 10 minutes for uploads (POST/PUT/PATCH),
// 1 minute for downloads.
static const NSTimeInterval kUnsetMaxRetryInterval = -1;
static const NSTimeInterval kDefaultMaxDownloadRetryInterval = 60.0;
static const NSTimeInterval kDefaultMaxUploadRetryInterval = 60.0 * 10.;
// delegateQueue callback parameters
static NSString *const kCallbackData = @"data";
static NSString *const kCallbackError = @"error";
//
// GTMHTTPFetcher
//
@interface GTMHTTPFetcher ()
@property (copy) NSString *temporaryDownloadPath;
@property (retain) id <GTMCookieStorageProtocol> cookieStorage;
@property (readwrite, retain) NSData *downloadedData;
#if NS_BLOCKS_AVAILABLE
@property (copy) void (^completionBlock)(NSData *, NSError *);
#endif
- (BOOL)beginFetchMayDelay:(BOOL)mayDelay
mayAuthorize:(BOOL)mayAuthorize;
- (void)failToBeginFetchWithError:(NSError *)error;
- (void)failToBeginFetchDeferWithError:(NSError *)error;
#if GTM_BACKGROUND_FETCHING
- (void)endBackgroundTask;
- (void)backgroundFetchExpired;
#endif
- (BOOL)authorizeRequest;
- (void)authorizer:(id <GTMFetcherAuthorizationProtocol>)auth
request:(NSMutableURLRequest *)request
finishedWithError:(NSError *)error;
- (NSString *)createTempDownloadFilePathForPath:(NSString *)targetPath;
- (void)stopFetchReleasingCallbacks:(BOOL)shouldReleaseCallbacks;
- (BOOL)shouldReleaseCallbacksUponCompletion;
- (void)addCookiesToRequest:(NSMutableURLRequest *)request;
- (void)handleCookiesForResponse:(NSURLResponse *)response;
- (void)invokeFetchCallbacksWithData:(NSData *)data
error:(NSError *)error;
- (void)invokeFetchCallback:(SEL)sel
target:(id)target
data:(NSData *)data
error:(NSError *)error;
- (void)invokeFetchCallbacksOnDelegateQueueWithData:(NSData *)data
error:(NSError *)error;
- (void)releaseCallbacks;
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
- (BOOL)shouldRetryNowForStatus:(NSInteger)status error:(NSError *)error;
- (void)destroyRetryTimer;
- (void)beginRetryTimer;
- (void)primeRetryTimerWithNewTimeInterval:(NSTimeInterval)secs;
- (void)sendStopNotificationIfNeeded;
- (void)retryFetch;
- (void)retryTimerFired:(NSTimer *)timer;
@end
@interface GTMHTTPFetcher (GTMHTTPFetcherLoggingInternal)
- (void)setupStreamLogging;
- (void)logFetchWithError:(NSError *)error;
@end
@implementation GTMHTTPFetcher
+ (GTMHTTPFetcher *)fetcherWithRequest:(NSURLRequest *)request {
return [[[[self class] alloc] initWithRequest:request] autorelease];
}
+ (GTMHTTPFetcher *)fetcherWithURL:(NSURL *)requestURL {
return [self fetcherWithRequest:[NSURLRequest requestWithURL:requestURL]];
}
+ (GTMHTTPFetcher *)fetcherWithURLString:(NSString *)requestURLString {
return [self fetcherWithURL:[NSURL URLWithString:requestURLString]];
}
+ (void)initialize {
// initialize is guaranteed by the runtime to be called in a
// thread-safe manner
if (!gGTMFetcherStaticCookieStorage) {
Class cookieStorageClass = NSClassFromString(@"GTMCookieStorage");
if (cookieStorageClass) {
gGTMFetcherStaticCookieStorage = [[cookieStorageClass alloc] init];
}
}
}
- (id)init {
return [self initWithRequest:nil];
}
- (id)initWithRequest:(NSURLRequest *)request {
self = [super init];
if (self) {
request_ = [request mutableCopy];
if (gGTMFetcherStaticCookieStorage != nil) {
// The user has compiled with the cookie storage class available;
// default to static cookie storage, so our cookies are independent
// of the cookies of other apps.
[self setCookieStorageMethod:kGTMHTTPFetcherCookieStorageMethodStatic];
} else {
// Default to system default cookie storage
[self setCookieStorageMethod:kGTMHTTPFetcherCookieStorageMethodSystemDefault];
}
}
return self;
}
- (id)copyWithZone:(NSZone *)zone {
// disallow use of fetchers in a copy property
[self doesNotRecognizeSelector:_cmd];
return nil;
}
- (NSString *)description {
return [NSString stringWithFormat:@"%@ %p (%@)",
[self class], self, [self.mutableRequest URL]];
}
#if !GTM_IPHONE
- (void)finalize {
[self stopFetchReleasingCallbacks:YES]; // releases connection_, destroys timers
[super finalize];
}
#endif
- (void)dealloc {
#if DEBUG
NSAssert(!isStopNotificationNeeded_,
@"unbalanced fetcher notification for %@", [request_ URL]);
#endif
// Note: if a connection or a retry timer was pending, then this instance
// would be retained by those so it wouldn't be getting dealloc'd,
// hence we don't need to stopFetch here
[request_ release];
[connection_ release];
[downloadedData_ release];
[downloadPath_ release];
[temporaryDownloadPath_ release];
[downloadFileHandle_ release];
[credential_ release];
[proxyCredential_ release];
[postData_ release];
[postStream_ release];
[loggedStreamData_ release];
[response_ release];
#if NS_BLOCKS_AVAILABLE
[completionBlock_ release];
[receivedDataBlock_ release];
[sentDataBlock_ release];
[retryBlock_ release];
#endif
[userData_ release];
[properties_ release];
[delegateQueue_ release];
[runLoopModes_ release];
[fetchHistory_ release];
[cookieStorage_ release];
[authorizer_ release];
[service_ release];
[serviceHost_ release];
[thread_ release];
[retryTimer_ release];
[comment_ release];
[log_ release];
#if !STRIP_GTM_FETCH_LOGGING
[logRequestBody_ release];
[logResponseBody_ release];
#endif
[super dealloc];
}
#pragma mark -
// Begin fetching the URL (or begin a retry fetch). The delegate is retained
// for the duration of the fetch connection.
- (BOOL)beginFetchWithDelegate:(id)delegate
didFinishSelector:(SEL)finishedSelector {
GTMAssertSelectorNilOrImplementedWithArgs(delegate, finishedSelector, @encode(GTMHTTPFetcher *), @encode(NSData *), @encode(NSError *), 0);
GTMAssertSelectorNilOrImplementedWithArgs(delegate, receivedDataSel_, @encode(GTMHTTPFetcher *), @encode(NSData *), 0);
GTMAssertSelectorNilOrImplementedWithArgs(delegate, retrySel_, @encode(GTMHTTPFetcher *), @encode(BOOL), @encode(NSError *), 0);
// We'll retain the delegate only during the outstanding connection (similar
// to what Cocoa does with performSelectorOnMainThread:) and during
// authorization or delays, since the app would crash
// if the delegate was released before the fetch calls back
[self setDelegate:delegate];
finishedSel_ = finishedSelector;
return [self beginFetchMayDelay:YES
mayAuthorize:YES];
}
- (BOOL)beginFetchMayDelay:(BOOL)mayDelay
mayAuthorize:(BOOL)mayAuthorize {
// This is the internal entry point for re-starting fetches
NSError *error = nil;
if (connection_ != nil) {
NSAssert1(connection_ != nil, @"fetch object %@ being reused; this should never happen", self);
goto CannotBeginFetch;
}
if (request_ == nil || [request_ URL] == nil) {
NSAssert(request_ != nil, @"beginFetchWithDelegate requires a request with a URL");
goto CannotBeginFetch;
}
self.downloadedData = nil;
downloadedLength_ = 0;
if (mayDelay && service_) {
BOOL shouldFetchNow = [service_ fetcherShouldBeginFetching:self];
if (!shouldFetchNow) {
// the fetch is deferred, but will happen later
return YES;
}
}
NSString *effectiveHTTPMethod = [request_ valueForHTTPHeaderField:@"X-HTTP-Method-Override"];
if (effectiveHTTPMethod == nil) {
effectiveHTTPMethod = [request_ HTTPMethod];
}
BOOL isEffectiveHTTPGet = (effectiveHTTPMethod == nil
|| [effectiveHTTPMethod isEqual:@"GET"]);
if (postData_ || postStream_) {
if (isEffectiveHTTPGet) {
[request_ setHTTPMethod:@"POST"];
isEffectiveHTTPGet = NO;
}
if (postData_) {
[request_ setHTTPBody:postData_];
} else {
if ([self respondsToSelector:@selector(setupStreamLogging)]) {
[self performSelector:@selector(setupStreamLogging)];
}
[request_ setHTTPBodyStream:postStream_];
}
}
// We authorize after setting up the http method and body in the request
// because OAuth 1 may need to sign the request body
if (mayAuthorize && authorizer_) {
BOOL isAuthorized = [authorizer_ isAuthorizedRequest:request_];
if (!isAuthorized) {
// authorization needed
return [self authorizeRequest];
}
}
[fetchHistory_ updateRequest:request_ isHTTPGet:isEffectiveHTTPGet];
// set the default upload or download retry interval, if necessary
if (isRetryEnabled_
&& maxRetryInterval_ <= kUnsetMaxRetryInterval) {
if (isEffectiveHTTPGet || [effectiveHTTPMethod isEqual:@"HEAD"]) {
[self setMaxRetryInterval:kDefaultMaxDownloadRetryInterval];
} else {
[self setMaxRetryInterval:kDefaultMaxUploadRetryInterval];
}
}
[self addCookiesToRequest:request_];
if (downloadPath_ != nil) {
// downloading to a path, so create a temporary file and a file handle for
// downloading
NSString *tempPath = [self createTempDownloadFilePathForPath:downloadPath_];
BOOL didCreate = [[NSData data] writeToFile:tempPath
options:0
error:&error];
if (!didCreate) goto CannotBeginFetch;
[self setTemporaryDownloadPath:tempPath];
NSFileHandle *fh = [NSFileHandle fileHandleForWritingAtPath:tempPath];
if (fh == nil) goto CannotBeginFetch;
[self setDownloadFileHandle:fh];
}
// finally, start the connection
Class connectionClass = [[self class] connectionClass];
NSOperationQueue *delegateQueue = delegateQueue_;
if (delegateQueue &&
![connectionClass instancesRespondToSelector:@selector(setDelegateQueue:)]) {
// NSURLConnection has no setDelegateQueue: on iOS 4 and Mac OS X 10.5.
delegateQueue = nil;
self.delegateQueue = nil;
}
#if DEBUG && TARGET_OS_IPHONE
BOOL isPreIOS6 = (NSFoundationVersionNumber <= 890.1);
if (isPreIOS6 && delegateQueue) {
NSLog(@"GTMHTTPFetcher delegateQueue not safe in iOS 5");
}
#endif
if ([runLoopModes_ count] == 0 && delegateQueue == nil) {
// No custom callback modes or queue were specified, so start the connection
// on the current run loop in the current mode
connection_ = [[connectionClass connectionWithRequest:request_
delegate:self] retain];
} else {
// Specify callbacks be on an operation queue or on the current run loop
// in the specified modes
connection_ = [[connectionClass alloc] initWithRequest:request_
delegate:self
startImmediately:NO];
if (delegateQueue) {
[connection_ performSelector:@selector(setDelegateQueue:)
withObject:delegateQueue];
} else if (runLoopModes_) {
NSRunLoop *rl = [NSRunLoop currentRunLoop];
for (NSString *mode in runLoopModes_) {
[connection_ scheduleInRunLoop:rl forMode:mode];
}
}
[connection_ start];
}
hasConnectionEnded_ = NO;
if (!connection_) {
NSAssert(connection_ != nil, @"beginFetchWithDelegate could not create a connection");
goto CannotBeginFetch;
}
if (downloadFileHandle_ != nil) {
// downloading to a file, so downloadedData_ remains nil
} else {
self.downloadedData = [NSMutableData data];
}
#if GTM_BACKGROUND_FETCHING
backgroundTaskIdentifer_ = 0; // UIBackgroundTaskInvalid is 0 on iOS 4
if (shouldFetchInBackground_) {
// For iOS 3 compatibility, ensure that UIApp supports backgrounding
UIApplication *app = [UIApplication sharedApplication];
if ([app respondsToSelector:@selector(beginBackgroundTaskWithExpirationHandler:)]) {
// Tell UIApplication that we want to continue even when the app is in the
// background.
NSThread *thread = [NSThread currentThread];
backgroundTaskIdentifer_ = [app beginBackgroundTaskWithExpirationHandler:^{
// Callback - this block is always invoked by UIApplication on the main
// thread, but we want to run the user's callbacks on the thread used
// to start the fetch.
[self performSelector:@selector(backgroundFetchExpired)
onThread:thread
withObject:nil
waitUntilDone:YES];
}];
}
}
#endif
// Once connection_ is non-nil we can send the start notification
isStopNotificationNeeded_ = YES;
NSNotificationCenter *defaultNC = [NSNotificationCenter defaultCenter];
[defaultNC postNotificationName:kGTMHTTPFetcherStartedNotification
object:self];
return YES;
CannotBeginFetch:
[self failToBeginFetchDeferWithError:error];
return NO;
}
- (void)failToBeginFetchDeferWithError:(NSError *)error {
if (delegateQueue_) {
// Deferring will happen by the callback being invoked on the specified
// queue.
[self failToBeginFetchWithError:error];
} else {
// No delegate queue has been specified, so put the callback
// on an appropriate run loop.
NSArray *modes = (runLoopModes_ ? runLoopModes_ :
[NSArray arrayWithObject:NSRunLoopCommonModes]);
[self performSelector:@selector(failToBeginFetchWithError:)
onThread:[NSThread currentThread]
withObject:error
waitUntilDone:NO
modes:modes];
}
}
- (void)failToBeginFetchWithError:(NSError *)error {
if (error == nil) {
error = [NSError errorWithDomain:kGTMHTTPFetcherErrorDomain
code:kGTMHTTPFetcherErrorDownloadFailed
userInfo:nil];
}
[[self retain] autorelease]; // In case the callback releases us
[self invokeFetchCallbacksOnDelegateQueueWithData:nil
error:error];
[self releaseCallbacks];
[service_ fetcherDidStop:self];
self.authorizer = nil;
if (temporaryDownloadPath_) {
[[NSFileManager defaultManager] removeItemAtPath:temporaryDownloadPath_
error:NULL];
self.temporaryDownloadPath = nil;
}
}
#if GTM_BACKGROUND_FETCHING
- (void)backgroundFetchExpired {
// On background expiration, we stop the fetch and invoke the callbacks
NSError *error = [NSError errorWithDomain:kGTMHTTPFetcherErrorDomain
code:kGTMHTTPFetcherErrorBackgroundExpiration
userInfo:nil];
[self invokeFetchCallbacksOnDelegateQueueWithData:nil
error:error];
@synchronized(self) {
// Stopping the fetch here will indirectly call endBackgroundTask
[self stopFetchReleasingCallbacks:NO];
[self releaseCallbacks];
self.authorizer = nil;
}
}
- (void)endBackgroundTask {
@synchronized(self) {
// Whenever the connection stops or background execution expires,
// we need to tell UIApplication we're done
if (backgroundTaskIdentifer_) {
// If backgroundTaskIdentifer_ is non-zero, we know we're on iOS 4
UIApplication *app = [UIApplication sharedApplication];
[app endBackgroundTask:backgroundTaskIdentifer_];
backgroundTaskIdentifer_ = 0;
}
}
}
#endif // GTM_BACKGROUND_FETCHING
- (BOOL)authorizeRequest {
id authorizer = self.authorizer;
SEL asyncAuthSel = @selector(authorizeRequest:delegate:didFinishSelector:);
if ([authorizer respondsToSelector:asyncAuthSel]) {
SEL callbackSel = @selector(authorizer:request:finishedWithError:);
[authorizer authorizeRequest:request_
delegate:self
didFinishSelector:callbackSel];
return YES;
} else {
NSAssert(authorizer == nil, @"invalid authorizer for fetch");
// No authorizing possible, and authorizing happens only after any delay;
// just begin fetching
return [self beginFetchMayDelay:NO
mayAuthorize:NO];
}
}
- (void)authorizer:(id <GTMFetcherAuthorizationProtocol>)auth
request:(NSMutableURLRequest *)request
finishedWithError:(NSError *)error {
if (error != nil) {
// We can't fetch without authorization
[self failToBeginFetchDeferWithError:error];
} else {
[self beginFetchMayDelay:NO
mayAuthorize:NO];
}
}
#if NS_BLOCKS_AVAILABLE
- (BOOL)beginFetchWithCompletionHandler:(void (^)(NSData *data, NSError *error))handler {
self.completionBlock = handler;
// The user may have called setDelegate: earlier if they want to use other
// delegate-style callbacks during the fetch; otherwise, the delegate is nil,
// which is fine.
return [self beginFetchWithDelegate:[self delegate]
didFinishSelector:nil];
}
#endif
- (NSString *)createTempDownloadFilePathForPath:(NSString *)targetPath {
NSString *tempDir = nil;
#if (!TARGET_OS_IPHONE && (MAC_OS_X_VERSION_MAX_ALLOWED >= 1060))
// Find an appropriate directory for the download, ideally on the same disk
// as the final target location so the temporary file won't have to be moved
// to a different disk.
//
// Available in SDKs for 10.6 and iOS 4
//
// Oct 2011: We previously also used URLForDirectory for
// (TARGET_OS_IPHONE && (__IPHONE_OS_VERSION_MAX_ALLOWED >= 40000))
// but that is returning a non-temporary directory for iOS, unfortunately
SEL sel = @selector(URLForDirectory:inDomain:appropriateForURL:create:error:);
if ([NSFileManager instancesRespondToSelector:sel]) {
NSError *error = nil;
NSURL *targetURL = [NSURL fileURLWithPath:targetPath];
NSFileManager *fileMgr = [NSFileManager defaultManager];
NSURL *tempDirURL = [fileMgr URLForDirectory:NSItemReplacementDirectory
inDomain:NSUserDomainMask
appropriateForURL:targetURL
create:YES
error:&error];
tempDir = [tempDirURL path];
}
#endif
if (tempDir == nil) {
tempDir = NSTemporaryDirectory();
}
static unsigned int counter = 0;
NSString *name = [NSString stringWithFormat:@"gtmhttpfetcher_%u_%u",
++counter, (unsigned int) arc4random()];
NSString *result = [tempDir stringByAppendingPathComponent:name];
return result;
}
- (void)addCookiesToRequest:(NSMutableURLRequest *)request {
// Get cookies for this URL from our storage array, if
// we have a storage array
if (cookieStorageMethod_ != kGTMHTTPFetcherCookieStorageMethodSystemDefault
&& cookieStorageMethod_ != kGTMHTTPFetcherCookieStorageMethodNone) {
NSArray *cookies = [cookieStorage_ cookiesForURL:[request URL]];
if ([cookies count] > 0) {
NSDictionary *headerFields = [NSHTTPCookie requestHeaderFieldsWithCookies:cookies];
NSString *cookieHeader = [headerFields objectForKey:@"Cookie"]; // key used in header dictionary
if (cookieHeader) {
[request addValue:cookieHeader forHTTPHeaderField:@"Cookie"]; // header name
}
}
}
}
// Returns YES if this is in the process of fetching a URL, or waiting to
// retry, or waiting for authorization, or waiting to be issued by the
// service object
- (BOOL)isFetching {
if (connection_ != nil || retryTimer_ != nil) return YES;
BOOL isAuthorizing = [authorizer_ isAuthorizingRequest:request_];
if (isAuthorizing) return YES;
BOOL isDelayed = [service_ isDelayingFetcher:self];
return isDelayed;
}
// Returns the status code set in connection:didReceiveResponse:
- (NSInteger)statusCode {
NSInteger statusCode;
if (response_ != nil
&& [response_ respondsToSelector:@selector(statusCode)]) {
statusCode = [(NSHTTPURLResponse *)response_ statusCode];
} else {
// Default to zero, in hopes of hinting "Unknown" (we can't be
// sure that things are OK enough to use 200).
statusCode = 0;
}
return statusCode;
}
- (NSDictionary *)responseHeaders {
if (response_ != nil
&& [response_ respondsToSelector:@selector(allHeaderFields)]) {
NSDictionary *headers = [(NSHTTPURLResponse *)response_ allHeaderFields];
return headers;
}
return nil;
}
- (void)releaseCallbacks {
[delegate_ autorelease];
delegate_ = nil;
[delegateQueue_ autorelease];
delegateQueue_ = nil;
#if NS_BLOCKS_AVAILABLE
self.completionBlock = nil;
self.sentDataBlock = nil;
self.receivedDataBlock = nil;
self.retryBlock = nil;
#endif
}
// Cancel the fetch of the URL that's currently in progress.
- (void)stopFetchReleasingCallbacks:(BOOL)shouldReleaseCallbacks {
id <GTMHTTPFetcherServiceProtocol> service;
// if the connection or the retry timer is all that's retaining the fetcher,
// we want to be sure this instance survives stopping at least long enough for
// the stack to unwind
[[self retain] autorelease];
[self destroyRetryTimer];
@synchronized(self) {
service = [[service_ retain] autorelease];
if (connection_) {
// in case cancelling the connection calls this recursively, we want
// to ensure that we'll only release the connection and delegate once,
// so first set connection_ to nil
NSURLConnection* oldConnection = connection_;
connection_ = nil;
if (!hasConnectionEnded_) {
[oldConnection cancel];
}
// this may be called in a callback from the connection, so use autorelease
[oldConnection autorelease];
}
}
// send the stopped notification
[self sendStopNotificationIfNeeded];
@synchronized(self) {
[authorizer_ stopAuthorizationForRequest:request_];
if (shouldReleaseCallbacks) {
[self releaseCallbacks];
self.authorizer = nil;
}
if (temporaryDownloadPath_) {
[[NSFileManager defaultManager] removeItemAtPath:temporaryDownloadPath_
error:NULL];
self.temporaryDownloadPath = nil;
}
}
[service fetcherDidStop:self];
#if GTM_BACKGROUND_FETCHING
[self endBackgroundTask];
#endif
}
// External stop method
- (void)stopFetching {
[self stopFetchReleasingCallbacks:YES];
}
- (void)sendStopNotificationIfNeeded {
BOOL sendNow = NO;
@synchronized(self) {
if (isStopNotificationNeeded_) {
isStopNotificationNeeded_ = NO;
sendNow = YES;
}
}
if (sendNow) {
NSNotificationCenter *defaultNC = [NSNotificationCenter defaultCenter];
[defaultNC postNotificationName:kGTMHTTPFetcherStoppedNotification
object:self];
}
}
- (void)retryFetch {
[self stopFetchReleasingCallbacks:NO];
[self beginFetchWithDelegate:delegate_
didFinishSelector:finishedSel_];
}
- (void)waitForCompletionWithTimeout:(NSTimeInterval)timeoutInSeconds {
NSDate* giveUpDate = [NSDate dateWithTimeIntervalSinceNow:timeoutInSeconds];
// Loop until the callbacks have been called and released, and until
// the connection is no longer pending, or until the timeout has expired
BOOL isMainThread = [NSThread isMainThread];
while ((!hasConnectionEnded_
#if NS_BLOCKS_AVAILABLE
|| completionBlock_ != nil
#endif
|| delegate_ != nil)
&& [giveUpDate timeIntervalSinceNow] > 0) {
// Run the current run loop 1/1000 of a second to give the networking
// code a chance to work
if (isMainThread || delegateQueue_ == nil) {
NSDate *stopDate = [NSDate dateWithTimeIntervalSinceNow:0.001];
[[NSRunLoop currentRunLoop] runUntilDate:stopDate];
} else {
[NSThread sleepForTimeInterval:0.001];
}
}
}
#pragma mark NSURLConnection Delegate Methods
//
// NSURLConnection Delegate Methods
//
// This method just says "follow all redirects", which _should_ be the default behavior,
// According to file:///Developer/ADC%20Reference%20Library/documentation/Cocoa/Conceptual/URLLoadingSystem
// but the redirects were not being followed until I added this method. May be
// a bug in the NSURLConnection code, or the documentation.
//
// In OS X 10.4.8 and earlier, the redirect request doesn't
// get the original's headers and body. This causes POSTs to fail.
// So we construct a new request, a copy of the original, with overrides from the
// redirect.
//
// Docs say that if redirectResponse is nil, just return the redirectRequest.
- (NSURLRequest *)connection:(NSURLConnection *)connection
willSendRequest:(NSURLRequest *)redirectRequest
redirectResponse:(NSURLResponse *)redirectResponse {
@synchronized(self) {
if (redirectRequest && redirectResponse) {
// save cookies from the response
[self handleCookiesForResponse:redirectResponse];
NSMutableURLRequest *newRequest = [[request_ mutableCopy] autorelease];
// copy the URL
NSURL *redirectURL = [redirectRequest URL];
NSURL *url = [newRequest URL];
// disallow scheme changes (say, from https to http)
NSString *redirectScheme = [url scheme];
NSString *newScheme = [redirectURL scheme];
NSString *newResourceSpecifier = [redirectURL resourceSpecifier];
if ([redirectScheme caseInsensitiveCompare:@"http"] == NSOrderedSame
&& newScheme != nil
&& [newScheme caseInsensitiveCompare:@"https"] == NSOrderedSame) {
// allow the change from http to https
redirectScheme = newScheme;
}
NSString *newUrlString = [NSString stringWithFormat:@"%@:%@",
redirectScheme, newResourceSpecifier];
NSURL *newURL = [NSURL URLWithString:newUrlString];
[newRequest setURL:newURL];
// any headers in the redirect override headers in the original.
NSDictionary *redirectHeaders = [redirectRequest allHTTPHeaderFields];
for (NSString *key in redirectHeaders) {
NSString *value = [redirectHeaders objectForKey:key];
[newRequest setValue:value forHTTPHeaderField:key];
}
[self addCookiesToRequest:newRequest];
redirectRequest = newRequest;
// log the response we just received
[self setResponse:redirectResponse];
[self logNowWithError:nil];
// update the request for future logging
NSMutableURLRequest *mutable = [[redirectRequest mutableCopy] autorelease];
[self setMutableRequest:mutable];
}
return redirectRequest;
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
@synchronized(self) {
// This method is called when the server has determined that it
// has enough information to create the NSURLResponse
// it can be called multiple times, for example in the case of a
// redirect, so each time we reset the data.
[downloadedData_ setLength:0];
[downloadFileHandle_ truncateFileAtOffset:0];
downloadedLength_ = 0;
[self setResponse:response];
// Save cookies from the response
[self handleCookiesForResponse:response];
}
}
// handleCookiesForResponse: handles storage of cookies for responses passed to
// connection:willSendRequest:redirectResponse: and connection:didReceiveResponse:
- (void)handleCookiesForResponse:(NSURLResponse *)response {
if (cookieStorageMethod_ == kGTMHTTPFetcherCookieStorageMethodSystemDefault
|| cookieStorageMethod_ == kGTMHTTPFetcherCookieStorageMethodNone) {
// do nothing special for NSURLConnection's default storage mechanism
// or when we're ignoring cookies
} else if ([response respondsToSelector:@selector(allHeaderFields)]) {
// grab the cookies from the header as NSHTTPCookies and store them either
// into our static array or into the fetchHistory
NSDictionary *responseHeaderFields = [(NSHTTPURLResponse *)response allHeaderFields];
if (responseHeaderFields) {
NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:responseHeaderFields
forURL:[response URL]];
if ([cookies count] > 0) {
[cookieStorage_ setCookies:cookies];
}
}
}
}
-(void)connection:(NSURLConnection *)connection
didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
@synchronized(self) {
if ([challenge previousFailureCount] <= 2) {
NSURLCredential *credential = credential_;
if ([[challenge protectionSpace] isProxy] && proxyCredential_ != nil) {
credential = proxyCredential_;
}
// Here, if credential is still nil, then we *could* try to get it from
// NSURLCredentialStorage's defaultCredentialForProtectionSpace:.
// We don't, because we're assuming:
//
// - for server credentials, we only want ones supplied by the program
// calling http fetcher
// - for proxy credentials, if one were necessary and available in the
// keychain, it would've been found automatically by NSURLConnection
// and this challenge delegate method never would've been called
// anyway
if (credential) {
// try the credential
[[challenge sender] useCredential:credential
forAuthenticationChallenge:challenge];
return;
}
}
// If we don't have credentials, or we've already failed auth 3x,
// report the error, putting the challenge as a value in the userInfo
// dictionary.
#if DEBUG
NSAssert(!isCancellingChallenge_, @"isCancellingChallenge_ unexpected");
#endif
NSDictionary *userInfo = [NSDictionary dictionaryWithObject:challenge
forKey:kGTMHTTPFetcherErrorChallengeKey];
NSError *error = [NSError errorWithDomain:kGTMHTTPFetcherErrorDomain
code:kGTMHTTPFetcherErrorAuthenticationChallengeFailed
userInfo:userInfo];
// cancelAuthenticationChallenge seems to indirectly call
// connection:didFailWithError: now, though that isn't documented
//
// We'll use an ivar to make the indirect invocation of the
// delegate method do nothing.
isCancellingChallenge_ = YES;
[[challenge sender] cancelAuthenticationChallenge:challenge];
isCancellingChallenge_ = NO;
[self connection:connection didFailWithError:error];
}
}
- (void)invokeFetchCallbacksWithData:(NSData *)data
error:(NSError *)error {
// To avoid deadlocks, this should not be called inside of @synchronized(self)
id target;
SEL sel;
#if NS_BLOCKS_AVAILABLE
void (^block)(NSData *, NSError *);
#endif
@synchronized(self) {
target = delegate_;
sel = finishedSel_;
block = completionBlock_;
}
[[self retain] autorelease]; // In case the callback releases us
[self invokeFetchCallback:sel
target:target
data:data
error:error];
#if NS_BLOCKS_AVAILABLE
if (block) {
block(data, error);
}
#endif
}
- (void)invokeFetchCallback:(SEL)sel
target:(id)target
data:(NSData *)data
error:(NSError *)error {
// This method is available to subclasses which may provide a customized
// target pointer.
if (target && sel) {
NSMethodSignature *sig = [target methodSignatureForSelector:sel];
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:sig];
[invocation setSelector:sel];
[invocation setTarget:target];
[invocation setArgument:&self atIndex:2];
[invocation setArgument:&data atIndex:3];
[invocation setArgument:&error atIndex:4];
[invocation invoke];
}
}
- (void)invokeFetchCallbacksOnDelegateQueueWithData:(NSData *)data
error:(NSError *)error {
// This is called by methods that are not already on the delegateQueue
// (as NSURLConnection callbacks should already be, but other failures
// are not.)
if (!delegateQueue_) {
[self invokeFetchCallbacksWithData:data error:error];
}
// Values may be nil.
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithCapacity:2];
[dict setValue:data forKey:kCallbackData];
[dict setValue:error forKey:kCallbackError];
NSInvocationOperation *op =
[[[NSInvocationOperation alloc] initWithTarget:self
selector:@selector(invokeOnQueueWithDictionary:)
object:dict] autorelease];
[delegateQueue_ addOperation:op];
}
- (void)invokeOnQueueWithDictionary:(NSDictionary *)dict {
NSData *data = [dict objectForKey:kCallbackData];
NSError *error = [dict objectForKey:kCallbackError];
[self invokeFetchCallbacksWithData:data error:error];