/*

File: NSURLLoader.m

Abstract: CFNetwork ImageClient Sample

Version: 1.0

Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

Computer, 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.

In consideration of your agreement to abide by the following terms, and

subject to these terms, Apple grants you a personal, non-exclusive

license, under Apple's copyrights in this original Apple software (the

"Apple Software"), to use, reproduce, modify and redistribute the Apple

Software, with or without modifications, in source and/or binary forms;

provided that if you redistribute the Apple Software in its entirety and

without modifications, you must retain this notice and the following

text and disclaimers in all such redistributions of the Apple Software. 

Neither the name, trademarks, service marks or logos of Apple Computer,

Inc. may be used to endorse or promote products derived from the Apple

Software without specific prior written permission from Apple.  Except

as expressly stated in this notice, no other rights or licenses, express

or implied, are granted by Apple herein, including but not limited to

any patent rights that may be infringed by your derivative works or by

other works in which the Apple Software may be incorporated.

The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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) 2005 Apple Computer, Inc., All Rights Reserved

*/ 

#import "NSURLLoader.h"

#import "ImageClient.h"

#import "CFNetworkLoader.h"

@implementation NSURLLoader

- (id)initWithImageClient:(ImageClient *)imgClient {

    if (self = [super init]) {

        imageClient = imgClient; // No retain because the ImageClient instance is retaining us

    }

    return self;

}

- (void) dealloc {

    [self cancelLoad];

    [url release];

    [super dealloc];

}

- (void)loadURL:(NSURL *)theURL {

    // Cancel any load currently in progress

    [self cancelLoad];

    // Create an empty data to receive bytes from the download

    data = [[NSMutableData alloc] init];

    if (url) [url release];

    url = theURL;

    [url retain];

    // Start the download

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

}

- (void)cancelLoad {

    if (connection) {

        [connection cancel];

        [connection release];

        connection = nil;

    }

    if (data) {

        [data release];

        data = nil;

    }

    if (challenge) {

        [challenge release];

        challenge = nil;

    }

}

/* NSURLConnection delegate methods */

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)newData {

    [data appendData:newData];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    [imageClient setImageData:data];

    [self cancelLoad]; // This shuts down the connection for us

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

    CFNetDiagnosticRef diagnostics = CFNetDiagnosticCreateWithURL(NULL, (CFURLRef)url);

    [imageClient errorOccurredLoadingImage:diagnostics];

    [self cancelLoad]; // This shuts down the connection for us

}

/* Called when the connection receives a challenge from the server */

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)newChallenge {

    if (challenge) [challenge release];

    challenge = newChallenge;

    [challenge retain];

    NSURLProtectionSpace *space = [challenge protectionSpace];

    [imageClient authorizationNeededForRealm: [space realm] onHost: [space host]];

}

- (void)resumeWithCredentials {

    // Grab the username and password from imageClient and apply them to the challenge

    NSString *user = [imageClient username];

    NSString *pass = [imageClient password];

    // Guarantee values

    if (!user) user = @"";

    if (!pass) pass = @"";

    NSURLCredentialPersistence persistence = NSURLCredentialPersistenceForSession;

    if ([imageClient saveCredentials])

        persistence = NSURLCredentialPersistencePermanent;

    NSURLCredential *creds = [NSURLCredential credentialWithUser:user password:pass persistence: persistence];

    [[challenge sender] useCredential:creds forAuthenticationChallenge:challenge];

    [challenge release];

    challenge = nil;

}

/* Called when a connection waiting for user/pass is cancelled, so that we can clean up any lingering state */

- (void)connection:(NSURLConnection *)connection didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {

    [self cancelLoad];

}

@end