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ASIHTTPRequest.m
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ASIHTTPRequest.m
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//
// ASIHTTPRequest.m
//
// Created by Ben Copsey on 04/10/2007.
// Copyright 2007-2011 All-Seeing Interactive. All rights reserved.
//
// A guide to the main features is available at:
// http://allseeing-i.com/ASIHTTPRequest
//
// Portions are based on the ImageClient example from Apple:
// See: http://developer.apple.com/samplecode/ImageClient/listing37.html
#import "ASIHTTPRequest.h"
#if TARGET_OS_IPHONE
#import "Reachability.h"
#import "ASIAuthenticationDialog.h"
#import <MobileCoreServices/MobileCoreServices.h>
#else
#import <SystemConfiguration/SystemConfiguration.h>
#endif
#import "ASIInputStream.h"
#import "ASIDataDecompressor.h"
#import "ASIDataCompressor.h"
// Automatically set on build
NSString *ASIHTTPRequestVersion = @"v1.8-85 2011-05-15";
static NSString *defaultUserAgent = nil;
NSString* const NetworkRequestErrorDomain = @"ASIHTTPRequestErrorDomain";
static NSString *ASIHTTPRequestRunLoopMode = @"ASIHTTPRequestRunLoopMode";
static const CFOptionFlags kNetworkEvents = kCFStreamEventHasBytesAvailable | kCFStreamEventEndEncountered | kCFStreamEventErrorOccurred;
// In memory caches of credentials, used on when useSessionPersistence is YES
static NSMutableArray *sessionCredentialsStore = nil;
static NSMutableArray *sessionProxyCredentialsStore = nil;
// This lock mediates access to session credentials
static NSRecursiveLock *sessionCredentialsLock = nil;
// We keep track of cookies we have received here so we can remove them from the sharedHTTPCookieStorage later
static NSMutableArray *sessionCookies = nil;
// The number of times we will allow requests to redirect before we fail with a redirection error
const int RedirectionLimit = 5;
// The default number of seconds to use for a timeout
static NSTimeInterval defaultTimeOutSeconds = 10;
static void ReadStreamClientCallBack(CFReadStreamRef readStream, CFStreamEventType type, void *clientCallBackInfo) {
[((ASIHTTPRequest*)clientCallBackInfo) handleNetworkEvent: type];
}
// This lock prevents the operation from being cancelled while it is trying to update the progress, and vice versa
static NSRecursiveLock *progressLock;
static NSError *ASIRequestCancelledError;
static NSError *ASIRequestTimedOutError;
static NSError *ASIAuthenticationError;
static NSError *ASIUnableToCreateRequestError;
static NSError *ASITooMuchRedirectionError;
static NSMutableArray *bandwidthUsageTracker = nil;
static unsigned long averageBandwidthUsedPerSecond = 0;
// These are used for queuing persistent connections on the same connection
// Incremented every time we specify we want a new connection
static unsigned int nextConnectionNumberToCreate = 0;
// An array of connectionInfo dictionaries.
// When attempting a persistent connection, we look here to try to find an existing connection to the same server that is currently not in use
static NSMutableArray *persistentConnectionsPool = nil;
// Mediates access to the persistent connections pool
static NSRecursiveLock *connectionsLock = nil;
// Each request gets a new id, we store this rather than a ref to the request itself in the connectionInfo dictionary.
// We do this so we don't have to keep the request around while we wait for the connection to expire
static unsigned int nextRequestID = 0;
// Records how much bandwidth all requests combined have used in the last second
static unsigned long bandwidthUsedInLastSecond = 0;
// A date one second in the future from the time it was created
static NSDate *bandwidthMeasurementDate = nil;
// Since throttling variables are shared among all requests, we'll use a lock to mediate access
static NSLock *bandwidthThrottlingLock = nil;
// the maximum number of bytes that can be transmitted in one second
static unsigned long maxBandwidthPerSecond = 0;
// A default figure for throttling bandwidth on mobile devices
unsigned long const ASIWWANBandwidthThrottleAmount = 14800;
#if TARGET_OS_IPHONE
// YES when bandwidth throttling is active
// This flag does not denote whether throttling is turned on - rather whether it is currently in use
// It will be set to NO when throttling was turned on with setShouldThrottleBandwidthForWWAN, but a WI-FI connection is active
static BOOL isBandwidthThrottled = NO;
// When YES, bandwidth will be automatically throttled when using WWAN (3G/Edge/GPRS)
// Wifi will not be throttled
static BOOL shouldThrottleBandwithForWWANOnly = NO;
#endif
// Mediates access to the session cookies so requests
static NSRecursiveLock *sessionCookiesLock = nil;
// This lock ensures delegates only receive one notification that authentication is required at once
// When using ASIAuthenticationDialogs, it also ensures only one dialog is shown at once
// If a request can't acquire the lock immediately, it means a dialog is being shown or a delegate is handling the authentication challenge
// Once it gets the lock, it will try to look for existing credentials again rather than showing the dialog / notifying the delegate
// This is so it can make use of any credentials supplied for the other request, if they are appropriate
static NSRecursiveLock *delegateAuthenticationLock = nil;
// When throttling bandwidth, Set to a date in future that we will allow all requests to wake up and reschedule their streams
static NSDate *throttleWakeUpTime = nil;
static id <ASICacheDelegate> defaultCache = nil;
// Used for tracking when requests are using the network
static unsigned int runningRequestCount = 0;
// You can use [ASIHTTPRequest setShouldUpdateNetworkActivityIndicator:NO] if you want to manage it yourself
// Alternatively, override showNetworkActivityIndicator / hideNetworkActivityIndicator
// By default this does nothing on Mac OS X, but again override the above methods for a different behaviour
static BOOL shouldUpdateNetworkActivityIndicator = YES;
// The thread all requests will run on
// Hangs around forever, but will be blocked unless there are requests underway
static NSThread *networkThread = nil;
static NSOperationQueue *sharedQueue = nil;
// Private stuff
@interface ASIHTTPRequest ()
- (void)cancelLoad;
- (void)destroyReadStream;
- (void)scheduleReadStream;
- (void)unscheduleReadStream;
- (BOOL)willAskDelegateForCredentials;
- (BOOL)willAskDelegateForProxyCredentials;
- (void)askDelegateForProxyCredentials;
- (void)askDelegateForCredentials;
- (void)failAuthentication;
+ (void)measureBandwidthUsage;
+ (void)recordBandwidthUsage;
- (void)startRequest;
- (void)updateStatus:(NSTimer *)timer;
- (void)checkRequestStatus;
- (void)reportFailure;
- (void)reportFinished;
- (void)markAsFinished;
- (void)performRedirect;
- (BOOL)shouldTimeOut;
- (BOOL)willRedirect;
- (BOOL)willAskDelegateToConfirmRedirect;
+ (void)performInvocation:(NSInvocation *)invocation onTarget:(id *)target releasingObject:(id)objectToRelease;
+ (void)hideNetworkActivityIndicatorAfterDelay;
+ (void)hideNetworkActivityIndicatorIfNeeeded;
+ (void)runRequests;
// Handling Proxy autodetection and PAC file downloads
- (BOOL)configureProxies;
- (void)fetchPACFile;
- (void)finishedDownloadingPACFile:(ASIHTTPRequest *)theRequest;
- (void)runPACScript:(NSString *)script;
- (void)timeOutPACRead;
- (void)useDataFromCache;
// Called to update the size of a partial download when starting a request, or retrying after a timeout
- (void)updatePartialDownloadSize;
#if TARGET_OS_IPHONE
+ (void)registerForNetworkReachabilityNotifications;
+ (void)unsubscribeFromNetworkReachabilityNotifications;
// Called when the status of the network changes
+ (void)reachabilityChanged:(NSNotification *)note;
#endif
#if NS_BLOCKS_AVAILABLE
- (void)performBlockOnMainThread:(ASIBasicBlock)block;
- (void)releaseBlocksOnMainThread;
+ (void)releaseBlocks:(NSArray *)blocks;
- (void)callBlock:(ASIBasicBlock)block;
#endif
@property (assign) BOOL complete;
@property (retain) NSArray *responseCookies;
@property (assign) int responseStatusCode;
@property (retain, nonatomic) NSDate *lastActivityTime;
@property (assign) unsigned long long partialDownloadSize;
@property (assign, nonatomic) unsigned long long uploadBufferSize;
@property (retain, nonatomic) NSOutputStream *postBodyWriteStream;
@property (retain, nonatomic) NSInputStream *postBodyReadStream;
@property (assign, nonatomic) unsigned long long lastBytesRead;
@property (assign, nonatomic) unsigned long long lastBytesSent;
@property (retain) NSRecursiveLock *cancelledLock;
@property (retain, nonatomic) NSOutputStream *fileDownloadOutputStream;
@property (retain, nonatomic) NSOutputStream *inflatedFileDownloadOutputStream;
@property (assign) int authenticationRetryCount;
@property (assign) int proxyAuthenticationRetryCount;
@property (assign, nonatomic) BOOL updatedProgress;
@property (assign, nonatomic) BOOL needsRedirect;
@property (assign, nonatomic) int redirectCount;
@property (retain, nonatomic) NSData *compressedPostBody;
@property (retain, nonatomic) NSString *compressedPostBodyFilePath;
@property (retain) NSString *authenticationRealm;
@property (retain) NSString *proxyAuthenticationRealm;
@property (retain) NSString *responseStatusMessage;
@property (assign) BOOL inProgress;
@property (assign) int retryCount;
@property (assign) BOOL willRetryRequest;
@property (assign) BOOL connectionCanBeReused;
@property (retain, nonatomic) NSMutableDictionary *connectionInfo;
@property (retain, nonatomic) NSInputStream *readStream;
@property (assign) ASIAuthenticationState authenticationNeeded;
@property (assign, nonatomic) BOOL readStreamIsScheduled;
@property (assign, nonatomic) BOOL downloadComplete;
@property (retain) NSNumber *requestID;
@property (assign, nonatomic) NSString *runLoopMode;
@property (retain, nonatomic) NSTimer *statusTimer;
@property (assign) BOOL didUseCachedResponse;
@property (retain, nonatomic) NSURL *redirectURL;
@property (assign, nonatomic) BOOL isPACFileRequest;
@property (retain, nonatomic) ASIHTTPRequest *PACFileRequest;
@property (retain, nonatomic) NSInputStream *PACFileReadStream;
@property (retain, nonatomic) NSMutableData *PACFileData;
@property (assign, nonatomic, setter=setSynchronous:) BOOL isSynchronous;
@end
@implementation ASIHTTPRequest
#pragma mark init / dealloc
+ (void)initialize
{
if (self == [ASIHTTPRequest class]) {
persistentConnectionsPool = [[NSMutableArray alloc] init];
connectionsLock = [[NSRecursiveLock alloc] init];
progressLock = [[NSRecursiveLock alloc] init];
bandwidthThrottlingLock = [[NSLock alloc] init];
sessionCookiesLock = [[NSRecursiveLock alloc] init];
sessionCredentialsLock = [[NSRecursiveLock alloc] init];
delegateAuthenticationLock = [[NSRecursiveLock alloc] init];
bandwidthUsageTracker = [[NSMutableArray alloc] initWithCapacity:5];
ASIRequestTimedOutError = [[NSError alloc] initWithDomain:NetworkRequestErrorDomain code:ASIRequestTimedOutErrorType userInfo:[NSDictionary dictionaryWithObjectsAndKeys:@"The request timed out",NSLocalizedDescriptionKey,nil]];
ASIAuthenticationError = [[NSError alloc] initWithDomain:NetworkRequestErrorDomain code:ASIAuthenticationErrorType userInfo:[NSDictionary dictionaryWithObjectsAndKeys:@"Authentication needed",NSLocalizedDescriptionKey,nil]];
ASIRequestCancelledError = [[NSError alloc] initWithDomain:NetworkRequestErrorDomain code:ASIRequestCancelledErrorType userInfo:[NSDictionary dictionaryWithObjectsAndKeys:@"The request was cancelled",NSLocalizedDescriptionKey,nil]];
ASIUnableToCreateRequestError = [[NSError alloc] initWithDomain:NetworkRequestErrorDomain code:ASIUnableToCreateRequestErrorType userInfo:[NSDictionary dictionaryWithObjectsAndKeys:@"Unable to create request (bad url?)",NSLocalizedDescriptionKey,nil]];
ASITooMuchRedirectionError = [[NSError alloc] initWithDomain:NetworkRequestErrorDomain code:ASITooMuchRedirectionErrorType userInfo:[NSDictionary dictionaryWithObjectsAndKeys:@"The request failed because it redirected too many times",NSLocalizedDescriptionKey,nil]];
sharedQueue = [[NSOperationQueue alloc] init];
[sharedQueue setMaxConcurrentOperationCount:4];
}
}
- (id)initWithURL:(NSURL *)newURL
{
self = [self init];
[self setRequestMethod:@"GET"];
[self setRunLoopMode:NSDefaultRunLoopMode];
[self setShouldAttemptPersistentConnection:YES];
[self setPersistentConnectionTimeoutSeconds:60.0];
[self setShouldPresentCredentialsBeforeChallenge:YES];
[self setShouldRedirect:YES];
[self setShowAccurateProgress:YES];
[self setShouldResetDownloadProgress:YES];
[self setShouldResetUploadProgress:YES];
[self setAllowCompressedResponse:YES];
[self setShouldWaitToInflateCompressedResponses:YES];
[self setDefaultResponseEncoding:NSISOLatin1StringEncoding];
[self setShouldPresentProxyAuthenticationDialog:YES];
[self setTimeOutSeconds:[ASIHTTPRequest defaultTimeOutSeconds]];
[self setUseSessionPersistence:YES];
[self setUseCookiePersistence:YES];
[self setValidatesSecureCertificate:YES];
[self setRequestCookies:[[[NSMutableArray alloc] init] autorelease]];
[self setDidStartSelector:@selector(requestStarted:)];
[self setDidReceiveResponseHeadersSelector:@selector(request:didReceiveResponseHeaders:)];
[self setWillRedirectSelector:@selector(request:willRedirectToURL:)];
[self setDidFinishSelector:@selector(requestFinished:)];
[self setDidFailSelector:@selector(requestFailed:)];
[self setDidReceiveDataSelector:@selector(request:didReceiveData:)];
[self setURL:newURL];
[self setCancelledLock:[[[NSRecursiveLock alloc] init] autorelease]];
[self setDownloadCache:[[self class] defaultCache]];
return self;
}
+ (id)requestWithURL:(NSURL *)newURL
{
return [[[self alloc] initWithURL:newURL] autorelease];
}
+ (id)requestWithURL:(NSURL *)newURL usingCache:(id <ASICacheDelegate>)cache
{
return [self requestWithURL:newURL usingCache:cache andCachePolicy:ASIUseDefaultCachePolicy];
}
+ (id)requestWithURL:(NSURL *)newURL usingCache:(id <ASICacheDelegate>)cache andCachePolicy:(ASICachePolicy)policy
{
ASIHTTPRequest *request = [[[self alloc] initWithURL:newURL] autorelease];
[request setDownloadCache:cache];
[request setCachePolicy:policy];
return request;
}
- (void)dealloc
{
[self setAuthenticationNeeded:ASINoAuthenticationNeededYet];
if (requestAuthentication) {
CFRelease(requestAuthentication);
}
if (proxyAuthentication) {
CFRelease(proxyAuthentication);
}
if (request) {
CFRelease(request);
}
if (clientCertificateIdentity) {
CFRelease(clientCertificateIdentity);
}
[self cancelLoad];
[redirectURL release];
[statusTimer invalidate];
[statusTimer release];
[queue release];
[userInfo release];
[postBody release];
[compressedPostBody release];
[error release];
[requestHeaders release];
[requestCookies release];
[downloadDestinationPath release];
[temporaryFileDownloadPath release];
[temporaryUncompressedDataDownloadPath release];
[fileDownloadOutputStream release];
[inflatedFileDownloadOutputStream release];
[username release];
[password release];
[domain release];
[authenticationRealm release];
[authenticationScheme release];
[requestCredentials release];
[proxyHost release];
[proxyType release];
[proxyUsername release];
[proxyPassword release];
[proxyDomain release];
[proxyAuthenticationRealm release];
[proxyAuthenticationScheme release];
[proxyCredentials release];
[url release];
[originalURL release];
[lastActivityTime release];
[responseCookies release];
[rawResponseData release];
[responseHeaders release];
[requestMethod release];
[cancelledLock release];
[postBodyFilePath release];
[compressedPostBodyFilePath release];
[postBodyWriteStream release];
[postBodyReadStream release];
[PACurl release];
[clientCertificates release];
[responseStatusMessage release];
[connectionInfo release];
[requestID release];
[dataDecompressor release];
[userAgent release];
#if NS_BLOCKS_AVAILABLE
[self releaseBlocksOnMainThread];
#endif
[super dealloc];
}
#if NS_BLOCKS_AVAILABLE
- (void)releaseBlocksOnMainThread
{
NSMutableArray *blocks = [NSMutableArray array];
if (completionBlock) {
[blocks addObject:completionBlock];
[completionBlock release];
completionBlock = nil;
}
if (failureBlock) {
[blocks addObject:failureBlock];
[failureBlock release];
failureBlock = nil;
}
if (startedBlock) {
[blocks addObject:startedBlock];
[startedBlock release];
startedBlock = nil;
}
if (headersReceivedBlock) {
[blocks addObject:headersReceivedBlock];
[headersReceivedBlock release];
headersReceivedBlock = nil;
}
if (bytesReceivedBlock) {
[blocks addObject:bytesReceivedBlock];
[bytesReceivedBlock release];
bytesReceivedBlock = nil;
}
if (bytesSentBlock) {
[blocks addObject:bytesSentBlock];
[bytesSentBlock release];
bytesSentBlock = nil;
}
if (downloadSizeIncrementedBlock) {
[blocks addObject:downloadSizeIncrementedBlock];
[downloadSizeIncrementedBlock release];
downloadSizeIncrementedBlock = nil;
}
if (uploadSizeIncrementedBlock) {
[blocks addObject:uploadSizeIncrementedBlock];
[uploadSizeIncrementedBlock release];
uploadSizeIncrementedBlock = nil;
}
if (dataReceivedBlock) {
[blocks addObject:dataReceivedBlock];
[dataReceivedBlock release];
dataReceivedBlock = nil;
}
if (proxyAuthenticationNeededBlock) {
[blocks addObject:proxyAuthenticationNeededBlock];
[proxyAuthenticationNeededBlock release];
proxyAuthenticationNeededBlock = nil;
}
if (authenticationNeededBlock) {
[blocks addObject:authenticationNeededBlock];
[authenticationNeededBlock release];
authenticationNeededBlock = nil;
}
[[self class] performSelectorOnMainThread:@selector(releaseBlocks:) withObject:blocks waitUntilDone:[NSThread isMainThread]];
}
// Always called on main thread
+ (void)releaseBlocks:(NSArray *)blocks
{
// Blocks will be released when this method exits
}
#endif
#pragma mark setup request
- (void)addRequestHeader:(NSString *)header value:(NSString *)value
{
if (!requestHeaders) {
[self setRequestHeaders:[NSMutableDictionary dictionaryWithCapacity:1]];
}
[requestHeaders setObject:value forKey:header];
}
// This function will be called either just before a request starts, or when postLength is needed, whichever comes first
// postLength must be set by the time this function is complete
- (void)buildPostBody
{
if ([self haveBuiltPostBody]) {
return;
}
// Are we submitting the request body from a file on disk
if ([self postBodyFilePath]) {
// If we were writing to the post body via appendPostData or appendPostDataFromFile, close the write stream
if ([self postBodyWriteStream]) {
[[self postBodyWriteStream] close];
[self setPostBodyWriteStream:nil];
}
NSString *path;
if ([self shouldCompressRequestBody]) {
if (![self compressedPostBodyFilePath]) {
[self setCompressedPostBodyFilePath:[NSTemporaryDirectory() stringByAppendingPathComponent:[[NSProcessInfo processInfo] globallyUniqueString]]];
NSError *err = nil;
if (![ASIDataCompressor compressDataFromFile:[self postBodyFilePath] toFile:[self compressedPostBodyFilePath] error:&err]) {
[self failWithError:err];
return;
}
}
path = [self compressedPostBodyFilePath];
} else {
path = [self postBodyFilePath];
}
NSError *err = nil;
[self setPostLength:[[[[[NSFileManager alloc] init] autorelease] attributesOfItemAtPath:path error:&err] fileSize]];
if (err) {
[self failWithError:[NSError errorWithDomain:NetworkRequestErrorDomain code:ASIFileManagementError userInfo:[NSDictionary dictionaryWithObjectsAndKeys:[NSString stringWithFormat:@"Failed to get attributes for file at path '%@'",path],NSLocalizedDescriptionKey,error,NSUnderlyingErrorKey,nil]]];
return;
}
// Otherwise, we have an in-memory request body
} else {
if ([self shouldCompressRequestBody]) {
NSError *err = nil;
NSData *compressedBody = [ASIDataCompressor compressData:[self postBody] error:&err];
if (err) {
[self failWithError:err];
return;
}
[self setCompressedPostBody:compressedBody];
[self setPostLength:[[self compressedPostBody] length]];
} else {
[self setPostLength:[[self postBody] length]];
}
}
if ([self postLength] > 0) {
if ([requestMethod isEqualToString:@"GET"] || [requestMethod isEqualToString:@"DELETE"] || [requestMethod isEqualToString:@"HEAD"]) {
[self setRequestMethod:@"POST"];
}
[self addRequestHeader:@"Content-Length" value:[NSString stringWithFormat:@"%llu",[self postLength]]];
}
[self setHaveBuiltPostBody:YES];
}
// Sets up storage for the post body
- (void)setupPostBody
{
if ([self shouldStreamPostDataFromDisk]) {
if (![self postBodyFilePath]) {
[self setPostBodyFilePath:[NSTemporaryDirectory() stringByAppendingPathComponent:[[NSProcessInfo processInfo] globallyUniqueString]]];
[self setDidCreateTemporaryPostDataFile:YES];
}
if (![self postBodyWriteStream]) {
[self setPostBodyWriteStream:[[[NSOutputStream alloc] initToFileAtPath:[self postBodyFilePath] append:NO] autorelease]];
[[self postBodyWriteStream] open];
}
} else {
if (![self postBody]) {
[self setPostBody:[[[NSMutableData alloc] init] autorelease]];
}
}
}
- (void)appendPostData:(NSData *)data
{
[self setupPostBody];
if ([data length] == 0) {
return;
}
if ([self shouldStreamPostDataFromDisk]) {
[[self postBodyWriteStream] write:[data bytes] maxLength:[data length]];
} else {
[[self postBody] appendData:data];
}
}
- (void)appendPostDataFromFile:(NSString *)file
{
[self setupPostBody];
NSInputStream *stream = [[[NSInputStream alloc] initWithFileAtPath:file] autorelease];
[stream open];
NSUInteger bytesRead;
while ([stream hasBytesAvailable]) {
unsigned char buffer[1024*256];
bytesRead = [stream read:buffer maxLength:sizeof(buffer)];
if (bytesRead == 0) {
break;
}
if ([self shouldStreamPostDataFromDisk]) {
[[self postBodyWriteStream] write:buffer maxLength:bytesRead];
} else {
[[self postBody] appendData:[NSData dataWithBytes:buffer length:bytesRead]];
}
}
[stream close];
}
- (NSString *)requestMethod
{
[[self cancelledLock] lock];
NSString *m = requestMethod;
[[self cancelledLock] unlock];
return m;
}
- (void)setRequestMethod:(NSString *)newRequestMethod
{
[[self cancelledLock] lock];
if (requestMethod != newRequestMethod) {
[requestMethod release];
requestMethod = [newRequestMethod retain];
if ([requestMethod isEqualToString:@"POST"] || [requestMethod isEqualToString:@"PUT"] || [postBody length] || postBodyFilePath) {
[self setShouldAttemptPersistentConnection:NO];
}
}
[[self cancelledLock] unlock];
}
- (NSURL *)url
{
[[self cancelledLock] lock];
NSURL *u = url;
[[self cancelledLock] unlock];
return u;
}
- (void)setURL:(NSURL *)newURL
{
[[self cancelledLock] lock];
if ([newURL isEqual:[self url]]) {
[[self cancelledLock] unlock];
return;
}
[url release];
url = [newURL retain];
if (requestAuthentication) {
CFRelease(requestAuthentication);
requestAuthentication = NULL;
}
if (proxyAuthentication) {
CFRelease(proxyAuthentication);
proxyAuthentication = NULL;
}
if (request) {
CFRelease(request);
request = NULL;
}
[self setRedirectURL:nil];
[[self cancelledLock] unlock];
}
- (id)delegate
{
[[self cancelledLock] lock];
id d = delegate;
[[self cancelledLock] unlock];
return d;
}
- (void)setDelegate:(id)newDelegate
{
[[self cancelledLock] lock];
delegate = newDelegate;
[[self cancelledLock] unlock];
}
- (id)queue
{
[[self cancelledLock] lock];
id q = queue;
[[self cancelledLock] unlock];
return q;
}
- (void)setQueue:(id)newQueue
{
[[self cancelledLock] lock];
if (newQueue != queue) {
[queue release];
queue = [newQueue retain];
}
[[self cancelledLock] unlock];
}
#pragma mark get information about this request
// cancel the request - this must be run on the same thread as the request is running on
- (void)cancelOnRequestThread
{
#if DEBUG_REQUEST_STATUS
NSLog(@"[STATUS] Request cancelled: %@",self);
#endif
[[self cancelledLock] lock];
if ([self isCancelled] || [self complete]) {
[[self cancelledLock] unlock];
return;
}
[self failWithError:ASIRequestCancelledError];
[self setComplete:YES];
[self cancelLoad];
CFRetain(self);
[self willChangeValueForKey:@"isCancelled"];
cancelled = YES;
[self didChangeValueForKey:@"isCancelled"];
[[self cancelledLock] unlock];
CFRelease(self);
}
- (void)cancel
{
[self performSelector:@selector(cancelOnRequestThread) onThread:[[self class] threadForRequest:self] withObject:nil waitUntilDone:NO];
}
- (void)clearDelegatesAndCancel
{
[[self cancelledLock] lock];
// Clear delegates
[self setDelegate:nil];
[self setQueue:nil];
[self setDownloadProgressDelegate:nil];
[self setUploadProgressDelegate:nil];
#if NS_BLOCKS_AVAILABLE
// Clear blocks
[self releaseBlocksOnMainThread];
#endif
[[self cancelledLock] unlock];
[self cancel];
}
- (BOOL)isCancelled
{
BOOL result;
[[self cancelledLock] lock];
result = cancelled;
[[self cancelledLock] unlock];
return result;
}
// Call this method to get the received data as an NSString. Don't use for binary data!
- (NSString *)responseString
{
NSData *data = [self responseData];
if (!data) {
return nil;
}
return [[[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:[self responseEncoding]] autorelease];
}
- (BOOL)isResponseCompressed
{
NSString *encoding = [[self responseHeaders] objectForKey:@"Content-Encoding"];
return encoding && [encoding rangeOfString:@"gzip"].location != NSNotFound;
}
- (NSData *)responseData
{
if ([self isResponseCompressed] && [self shouldWaitToInflateCompressedResponses]) {
return [ASIDataDecompressor uncompressData:[self rawResponseData] error:NULL];
} else {
return [self rawResponseData];
}
return nil;
}
#pragma mark running a request
- (void)startSynchronous
{
#if DEBUG_REQUEST_STATUS || DEBUG_THROTTLING
NSLog(@"[STATUS] Starting synchronous request %@",self);
#endif
[self setSynchronous:YES];
[self setRunLoopMode:ASIHTTPRequestRunLoopMode];
[self setInProgress:YES];
if (![self isCancelled] && ![self complete]) {
[self main];
while (!complete) {
[[NSRunLoop currentRunLoop] runMode:[self runLoopMode] beforeDate:[NSDate distantFuture]];
}
}
[self setInProgress:NO];
}
- (void)start
{
[self setInProgress:YES];
[self performSelector:@selector(main) onThread:[[self class] threadForRequest:self] withObject:nil waitUntilDone:NO];
}
- (void)startAsynchronous
{
#if DEBUG_REQUEST_STATUS || DEBUG_THROTTLING
NSLog(@"[STATUS] Starting asynchronous request %@",self);
#endif
[sharedQueue addOperation:self];
}
#pragma mark concurrency
- (BOOL)isConcurrent
{
return YES;
}
- (BOOL)isFinished
{
return finished;
}
- (BOOL)isExecuting {
return [self inProgress];
}
#pragma mark request logic
// Create the request
- (void)main
{
@try {
[[self cancelledLock] lock];
#if TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_4_0
if ([ASIHTTPRequest isMultitaskingSupported] && [self shouldContinueWhenAppEntersBackground]) {
backgroundTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
// Synchronize the cleanup call on the main thread in case
// the task actually finishes at around the same time.
dispatch_async(dispatch_get_main_queue(), ^{
if (backgroundTask != UIBackgroundTaskInvalid)
{
[[UIApplication sharedApplication] endBackgroundTask:backgroundTask];
backgroundTask = UIBackgroundTaskInvalid;
[self cancel];
}
});
}];
}
#endif
// A HEAD request generated by an ASINetworkQueue may have set the error already. If so, we should not proceed.
if ([self error]) {
[self setComplete:YES];
[self markAsFinished];
return;
}
[self setComplete:NO];
[self setDidUseCachedResponse:NO];
if (![self url]) {
[self failWithError:ASIUnableToCreateRequestError];
return;
}
// Must call before we create the request so that the request method can be set if needs be
if (![self mainRequest]) {
[self buildPostBody];
}
if (![[self requestMethod] isEqualToString:@"GET"]) {
[self setDownloadCache:nil];
}
// If we're redirecting, we'll already have a CFHTTPMessageRef
if (request) {
CFRelease(request);
}
// Create a new HTTP request.
request = CFHTTPMessageCreateRequest(kCFAllocatorDefault, (CFStringRef)[self requestMethod], (CFURLRef)[self url], [self useHTTPVersionOne] ? kCFHTTPVersion1_0 : kCFHTTPVersion1_1);
if (!request) {
[self failWithError:ASIUnableToCreateRequestError];
return;
}
//If this is a HEAD request generated by an ASINetworkQueue, we need to let the main request generate its headers first so we can use them
if ([self mainRequest]) {
[[self mainRequest] buildRequestHeaders];
}
// Even if this is a HEAD request with a mainRequest, we still need to call to give subclasses a chance to add their own to HEAD requests (ASIS3Request does this)
[self buildRequestHeaders];
if ([self downloadCache]) {
// If this request should use the default policy, set its policy to the download cache's default policy
if (![self cachePolicy]) {
[self setCachePolicy:[[self downloadCache] defaultCachePolicy]];
}
// If have have cached data that is valid for this request, use that and stop
if ([[self downloadCache] canUseCachedDataForRequest:self]) {
[self useDataFromCache];
return;
}
// If cached data is stale, or we have been told to ask the server if it has been modified anyway, we need to add headers for a conditional GET
if ([self cachePolicy] & (ASIAskServerIfModifiedWhenStaleCachePolicy|ASIAskServerIfModifiedCachePolicy)) {
NSDictionary *cachedHeaders = [[self downloadCache] cachedResponseHeadersForURL:[self url]];
if (cachedHeaders) {
NSString *etag = [cachedHeaders objectForKey:@"Etag"];
if (etag) {
[[self requestHeaders] setObject:etag forKey:@"If-None-Match"];
}
NSString *lastModified = [cachedHeaders objectForKey:@"Last-Modified"];
if (lastModified) {
[[self requestHeaders] setObject:lastModified forKey:@"If-Modified-Since"];
}
}
}
}
[self applyAuthorizationHeader];
NSString *header;
for (header in [self requestHeaders]) {
CFHTTPMessageSetHeaderFieldValue(request, (CFStringRef)header, (CFStringRef)[[self requestHeaders] objectForKey:header]);
}
// If we immediately have access to proxy settings, start the request
// Otherwise, we'll start downloading the proxy PAC file, and call startRequest once that process is complete
if ([self configureProxies]) {
[self startRequest];
}
} @catch (NSException *exception) {
NSError *underlyingError = [NSError errorWithDomain:NetworkRequestErrorDomain code:ASIUnhandledExceptionError userInfo:[exception userInfo]];
[self failWithError:[NSError errorWithDomain:NetworkRequestErrorDomain code:ASIUnhandledExceptionError userInfo:[NSDictionary dictionaryWithObjectsAndKeys:[exception name],NSLocalizedDescriptionKey,[exception reason],NSLocalizedFailureReasonErrorKey,underlyingError,NSUnderlyingErrorKey,nil]]];
} @finally {
[[self cancelledLock] unlock];
}
}
- (void)applyAuthorizationHeader
{
// Do we want to send credentials before we are asked for them?
if (![self shouldPresentCredentialsBeforeChallenge]) {
#if DEBUG_HTTP_AUTHENTICATION
NSLog(@"[AUTH] Request %@ will not send credentials to the server until it asks for them",self);
#endif
return;
}
NSDictionary *credentials = nil;
// Do we already have an auth header?
if (![[self requestHeaders] objectForKey:@"Authorization"]) {
// If we have basic authentication explicitly set and a username and password set on the request, add a basic auth header
if ([self username] && [self password] && [[self authenticationScheme] isEqualToString:(NSString *)kCFHTTPAuthenticationSchemeBasic]) {
[self addBasicAuthenticationHeaderWithUsername:[self username] andPassword:[self password]];
#if DEBUG_HTTP_AUTHENTICATION
NSLog(@"[AUTH] Request %@ has a username and password set, and was manually configured to use BASIC. Will send credentials without waiting for an authentication challenge",self);
#endif
} else {
// See if we have any cached credentials we can use in the session store
if ([self useSessionPersistence]) {
credentials = [self findSessionAuthenticationCredentials];
if (credentials) {
// When the Authentication key is set, the credentials were stored after an authentication challenge, so we can let CFNetwork apply them
// (credentials for Digest and NTLM will always be stored like this)
if ([credentials objectForKey:@"Authentication"]) {
// If we've already talked to this server and have valid credentials, let's apply them to the request
if (CFHTTPMessageApplyCredentialDictionary(request, (CFHTTPAuthenticationRef)[credentials objectForKey:@"Authentication"], (CFDictionaryRef)[credentials objectForKey:@"Credentials"], NULL)) {
[self setAuthenticationScheme:[credentials objectForKey:@"AuthenticationScheme"]];
#if DEBUG_HTTP_AUTHENTICATION
NSLog(@"[AUTH] Request %@ found cached credentials (%@), will reuse without waiting for an authentication challenge",self,[credentials objectForKey:@"AuthenticationScheme"]);
#endif