Added support for PAC scripts, plus two tests for same

@@ -275,6 +275,8 @@ extern NSString* const NetworkRequestErrorDomain;
 	// Details on the proxy to use - you could set these yourself, but it's probably best to let ASIHTTPRequest detect the system proxy settings
 	NSString *proxyHost;
 	int proxyPort;
+	
+	NSURL *PACurl;
 }
 
 #pragma mark init / dealloc
@@ -437,6 +439,11 @@ extern NSString* const NetworkRequestErrorDomain;
 // Is only used when you have specified a Bundle Display Name (CFDisplayBundleName) or Bundle Name (CFBundleName) in your plist
 + (NSString *)defaultUserAgentString;
 
+#pragma mark proxy autoconfiguration
+
+// Returns an array of proxies to use for a particular url, given the url of a PAC script
++ (NSArray *)proxiesForURL:(NSURL *)theURL fromPAC:(NSURL *)pacScriptURL;
+
 @property (retain) NSString *username;
 @property (retain) NSString *password;
 @property (retain) NSString *domain;
@@ -495,4 +502,6 @@ extern NSString* const NetworkRequestErrorDomain;
 @property (assign) BOOL shouldRedirect;
 @property (assign) BOOL validatesSecureCertificate;
 @property (assign) BOOL shouldCompressRequestBody;
+@property (assign) BOOL needsProxyAuthentication;
+@property (retain) NSURL *PACurl;
 @end

@@ -76,7 +76,6 @@ static NSError *ASITooMuchRedirectionError;
 @property (retain, nonatomic) NSOutputStream *fileDownloadOutputStream;
 @property (assign, nonatomic) int authenticationRetryCount;
 @property (assign, nonatomic) int proxyAuthenticationRetryCount;
-@property (assign, nonatomic) BOOL needsProxyAuthentication;
 @property (assign, nonatomic) BOOL updatedProgress;
 @property (assign, nonatomic) BOOL needsRedirect;
 @property (assign, nonatomic) int redirectCount;
@@ -518,9 +517,23 @@ static NSError *ASITooMuchRedirectionError;
 	}
 	
 	
+	// Handle proxy settings
+
+	// Have details of the proxy been set on this request
 	if (![self proxyHost] && ![self proxyPort]) {
 		
+		// If not, we need to figure out what they'll be
+		
+		NSArray *proxies = nil;
+		
+		// Have we been given a proxy auto config file?
+		if ([self PACurl]) {
+			
+			proxies = [ASIHTTPRequest proxiesForURL:[self url] fromPAC:[self PACurl]];
+
 		// Detect proxy settings and apply them	
+		} else {
+		
 			#if TARGET_OS_IPHONE
 			#if !defined(TARGET_IPHONE_SIMULATOR) || __IPHONE_OS_VERSION_MIN_REQUIRED > __IPHONE_2_2
 			NSDictionary *proxySettings = [(NSDictionary *)CFNetworkCopySystemProxySettings() autorelease];
@@ -532,8 +545,16 @@ static NSError *ASITooMuchRedirectionError;
 			NSDictionary *proxySettings = [(NSDictionary *)SCDynamicStoreCopyProxies(NULL) autorelease];
 			#endif
 
-		NSArray *proxies = [(NSArray *)CFNetworkCopyProxiesForURL((CFURLRef)[self url], (CFDictionaryRef)proxySettings) autorelease];
-		if (proxies == NULL) {
+			proxies = [(NSArray *)CFNetworkCopyProxiesForURL((CFURLRef)[self url], (CFDictionaryRef)proxySettings) autorelease];
+			
+			// Now check to see if the proxy settings contained a PAC url, we need to run the script to get the real list of proxies if so
+			NSDictionary *settings = [proxies objectAtIndex:0];
+			if ([settings objectForKey:(NSString *)kCFProxyAutoConfigurationURLKey]) {
+				proxies = [ASIHTTPRequest proxiesForURL:[self url] fromPAC:[settings objectForKey:(NSString *)kCFProxyAutoConfigurationURLKey]];
+			}
+		}
+		
+		if (!proxies) {
 			CFRelease(readStream);
 			readStream = NULL;
 			[[self cancelledLock] unlock];
@@ -546,8 +567,6 @@ static NSError *ASITooMuchRedirectionError;
 			NSDictionary *settings = [proxies objectAtIndex:0];
 			[self setProxyHost:[settings objectForKey:(NSString *)kCFProxyHostNameKey]];
 			[self setProxyPort:[[settings objectForKey:(NSString *)kCFProxyPortNumberKey] intValue]];
-			//NSLog(@"%@",proxySettings);
-			//NSLog(@"%@",[proxies objectAtIndex:0]);
 		}
 	}
 	if ([self proxyHost] && [self proxyPort]) {
@@ -2173,6 +2192,31 @@ static NSError *ASITooMuchRedirectionError;
 	return [NSString stringWithFormat:@"%@ %@ (%@; %@ %@; %@)", appName, appVersion, deviceName, OSName, OSVersion, locale];
 }
 
+#pragma mark proxy autoconfiguration
+
+// Returns an array of proxies to use for a particular url, given the url of a PAC script
++ (NSArray *)proxiesForURL:(NSURL *)theURL fromPAC:(NSURL *)pacScriptURL
+{
+	// From: http://developer.apple.com/samplecode/CFProxySupportTool/listing1.html
+	// Work around <rdar://problem/5530166>.  This dummy call to 
+	// CFNetworkCopyProxiesForURL initialise some state within CFNetwork 
+	// that is required by CFNetworkCopyProxiesForAutoConfigurationScript.
+	(void) CFNetworkCopyProxiesForURL((CFURLRef)theURL, NULL);
+	
+	NSStringEncoding encoding;
+	NSError *err = nil;
+	NSString *script = [NSString stringWithContentsOfURL:pacScriptURL usedEncoding:&encoding error:&err];
+	if (err) {
+		return nil;
+	}
+	CFErrorRef err2 = NULL;
+	// Obtain the list of proxies by running the autoconfiguration script
+	NSArray *proxies = [(NSArray *)CFNetworkCopyProxiesForAutoConfigurationScript((CFStringRef)script,(CFURLRef)theURL, &err2) autorelease];
+	if (err2) {
+		return nil;
+	}
+	return proxies;
+}
 
 
 @synthesize username;
@@ -2249,4 +2293,5 @@ static NSError *ASITooMuchRedirectionError;
 
 @synthesize proxyHost;
 @synthesize proxyPort;
+@synthesize PACurl;
 @end

@@ -18,6 +18,37 @@ static NSString *proxyPassword = @"";
 
 @implementation ProxyTests
 
+- (void)testAutoConfigureWithPAC
+{
+	// To run this test, specify the location of the pac script that is available at http://developer.apple.com/samplecode/CFProxySupportTool/listing1.html
+	NSString *pacurl = @"file:///Users/ben/Desktop/test.pac";
+	ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://allseeing-i.com"]];
+	[request setPACurl:[NSURL URLWithString:pacurl]];
+	[request start];
+	NSLog(@"%@",[request proxyHost]);
+	BOOL success = [[request proxyHost] isEqualToString:@"proxy1.apple.com"];
+	GHAssertTrue(success,@"Failed to use the correct proxy");
+	
+	request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com"]];
+	[request setPACurl:[NSURL URLWithString:pacurl]];
+	[request start];
+	GHAssertNil([request proxyHost],@"Used a proxy when the script told us to go direct");
+}
+
+- (void)testAutoConfigureWithSystemPAC
+{
+	// To run this test, specify the pac script above in your network settings
+	ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://allseeing-i.com"]];
+	[request start];
+	NSLog(@"%@",[request proxyHost]);
+	BOOL success = [[request proxyHost] isEqualToString:@"proxy1.apple.com"];
+	GHAssertTrue(success,@"Failed to use the correct proxy");
+	
+	request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com"]];
+	[request start];
+	GHAssertNil([request proxyHost],@"Used a proxy when the script told us to go direct");
+}
+
 - (void)testProxy
 {
 	BOOL success = (![proxyHost isEqualToString:@""] && proxyPort > 0);

@@ -217,8 +217,13 @@
 - (void)authSheetDidEnd:(NSWindow *)sheet returnCode:(int)returnCode contextInfo:(void *)contextInfo {
 	ASIHTTPRequest *request = (ASIHTTPRequest *)contextInfo;
     if (returnCode == NSOKButton) {
+		if ([request needsProxyAuthentication]) {
+			[request setProxyUsername:[[[username stringValue] copy] autorelease]];
+			[request setProxyPassword:[[[password stringValue] copy] autorelease]];			
+		} else {
 			[request setUsername:[[[username stringValue] copy] autorelease]];
 			[request setPassword:[[[password stringValue] copy] autorelease]];
+		}
 		[request retryWithAuthentication];
     } else {
 		[request cancelLoad];