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//
// SyncResponseFetcher.m
// Notation
//
// Created by Zachary Schneirov on 11/29/09.
/*Copyright (c) 2010, Zachary Schneirov. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted
provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice, this list of conditions
and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice, this list of
conditions and the following disclaimer in the documentation and/or other materials provided with
the distribution.
- Neither the name of Notational Velocity nor the names of its contributors may be used to endorse
or promote products derived from this software without specific prior written permission. */
#import "SyncResponseFetcher.h"
#import "NSData_transformations.h"
@implementation SyncResponseFetcher
+ (void)initialize {
static BOOL initialized = NO;
[super initialize];
if (!initialized) {
[[NSURLCache sharedURLCache] setDiskCapacity:0];
}
}
- (id)initWithURL:(NSURL*)aURL bodyStringAsUTF8B64:(NSString*)stringToEncode delegate:(id)aDelegate {
NSData *B64Data = nil;
if (stringToEncode) {
NSString *B64String = [[stringToEncode dataUsingEncoding:NSUTF8StringEncoding] encodeBase64WithNewlines:NO];
if (!(B64Data = [B64String dataUsingEncoding:NSASCIIStringEncoding])) {
return nil;
}
}
return [self initWithURL:aURL POSTData:B64Data delegate:aDelegate];
}
- (id)initWithURL:(NSURL*)aURL POSTData:(NSData*)POSTData headers:(NSDictionary *)aHeaders delegate:(id)aDelegate {
return [self initWithURL:aURL POSTData:POSTData headers:aHeaders contentType:nil delegate:aDelegate];
}
- (id)initWithURL:(NSURL*)aURL POSTData:(NSData*)POSTData delegate:(id)aDelegate {
return [self initWithURL:aURL POSTData:POSTData headers:nil contentType:nil delegate:aDelegate];
}
- (id)initWithURL:(NSURL*)aURL POSTData:(NSData*)POSTData headers:(NSDictionary *)aHeaders contentType:(NSString*)contentType delegate:(id)aDelegate {
if ([self init]) {
receivedData = [[NSMutableData alloc] init];
requestURL = [aURL retain];
delegate = aDelegate;
dataToSend = [POSTData retain];
dataToSendContentType = [contentType copy];
requestHeaders = [aHeaders retain];
}
return self;
}
- (NSInvocation*)successInvocation {
return successInvocation;
}
- (void)setRepresentedObject:(id)anObject {
[representedObject autorelease];
representedObject = [anObject retain];
}
- (id)representedObject {
return representedObject;
}
- (BOOL)startWithSuccessInvocation:(NSInvocation*)anInvocation {
successInvocation = [anInvocation retain];
return [self start];
}
- (BOOL)start {
if (isRunning) return YES;
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:requestURL cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30.0];
if (!request) {
NSLog(@"%s: Couldn't create HTTP request with URL %@", _cmd, requestURL);
return NO;
}
[request setHTTPShouldHandleCookies:NO];
[request addValue:@"Sinus cardinalis nvALT 2.2B" forHTTPHeaderField:@"User-agent"];
if (requestHeaders) {
for (NSString *field in [requestHeaders allKeys]) {
[request addValue:[requestHeaders objectForKey:field] forHTTPHeaderField:field];
}
}
//if POSTData is nil, do a plain GET request
if (dataToSend) {
if (dataToSendContentType) {
[request addValue:dataToSendContentType forHTTPHeaderField:@"Content-Type"];
}
[request setHTTPBody:dataToSend];
[request setHTTPMethod:@"POST"];
}
[self retain];
[delegate retain];
didCancel = NO;
isRunning = YES;
//NSLog(@"starting request for URL '%@'", requestURL);
if (!(urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self])) {
NSLog(@"%s: Couldn't create NSURLConnection with URLRequest %@", _cmd, request);
isRunning = NO;
[self release];
[delegate release];
return NO;
}
return YES;
}
- (BOOL)isRunning {
return isRunning;
}
- (BOOL)didCancel {
return didCancel;
}
- (void)cancel {
if (!isRunning) return;
didCancel = YES;
[urlConnection cancel];
[self _fetchDidFinishWithError:NSLocalizedString(@"Operation cancelled",
@"Error string returned to indicate that the user cancelled a syncing service operation")];
}
- (void)dealloc {
[dataToSend release];
[dataToSendContentType release];
[requestURL release];
[receivedData release];
[urlConnection release];
[headers release];
[representedObject release];
[super dealloc];
}
- (id)delegate {
return delegate;
}
- (NSURL*)requestURL {
return requestURL;
}
- (NSDictionary*)headers {
return headers;
}
- (NSInteger)statusCode {
return lastStatusCode;
}
- (NSString*)errorMessage {
return lastErrorMessage;
}
- (NSString*)description {
return [NSString stringWithFormat:@"Fetcher(%X, %@)", self, requestURL];
}
- (void)_fetchDidFinishWithError:(NSString*)anErrString {
if (!isRunning) {
NSLog(@"not processing %s because fetcher was already stopped; should not be called", _cmd);
return;
}
//assumes that anErrString will always be provided in the case of any error, and thus indicates the presence of such
[delegate syncResponseFetcher:self receivedData:anErrString ? nil : receivedData returningError:anErrString];
//delegate just had another opportunity to stop us, so check to see if he did that
if (!isRunning) {
return;
}
if (!anErrString) [successInvocation invoke];
[successInvocation autorelease];
successInvocation = nil;
[lastErrorMessage autorelease];
lastErrorMessage = [anErrString retain];
[receivedData setLength:0];
[urlConnection autorelease];
urlConnection = nil;
isRunning = NO;
[self autorelease];
[delegate autorelease];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[receivedData setLength:0];
lastStatusCode = 0;
BOOL responseValid = [response isKindOfClass:[NSHTTPURLResponse class]];
lastStatusCode = [(NSHTTPURLResponse*)response statusCode];
if (!responseValid) {
[urlConnection cancel];
[self _fetchDidFinishWithError:[NSHTTPURLResponse localizedStringForStatusCode:lastStatusCode]];
} else if (responseValid) {
[headers autorelease];
headers = [[(NSHTTPURLResponse*)response allHeaderFields] copy];
}
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
if (data) {
[receivedData appendData:data];
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[self _fetchDidFinishWithError:nil];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[self _fetchDidFinishWithError:[error localizedDescription]];
}
@end
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