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IRWebAPIRequestOperation.m
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//
// IRWebAPIRequestOperation.m
// IRWebAPIKit
//
// Created by Evadne Wu on 6/25/12.
//
//
#import "IRWebAPIRequestOperation.h"
#import "IRWebAPIRequestContext.h"
#import "IRWebAPIInterceptor.h"
#import "IRWebAPIHelpers.h"
@interface IRWebAPIRequestOperation () <NSURLConnectionDataDelegate> {
BOOL _isExecuting;
BOOL _isFinished;
}
@property (nonatomic, readwrite, assign) IRWebAPIRequestState state;
@property (nonatomic, readwrite, strong) NSURLConnection *connection;
@property (nonatomic, readonly, strong) NSMutableData *data;
@property (nonatomic, readonly, strong) IRWebAPIInterceptor *interceptor;
@end
@implementation IRWebAPIRequestOperation
@synthesize context = _context;
@synthesize request = _request;
@synthesize connection = _connection;
@synthesize state = _state;
@synthesize result = _result;
@synthesize data = _data;
@synthesize interceptor = _interceptor;
- (id) initWithContext:(IRWebAPIRequestContext *)context {
self = [super init];
if (!self)
return nil;
_context = context;
_isExecuting = NO;
_isFinished = NO;
_state = IRWebAPIRequestStateEnqueued;
return self;
}
- (void) start {
if (![NSThread isMainThread]) {
[self performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:NO];
return;
}
[self willChangeValueForKey:@"isExecuting"];
_isExecuting = YES;
[self didChangeValueForKey:@"isExecuting"];
_data = [NSMutableData data];
_interceptor = [IRWebAPIInterceptor new];
_interceptor.receiver = self;
self.connection = [[NSURLConnection alloc] initWithRequest:self.request delegate:(id<NSURLConnectionDelegate>)_interceptor];
self.state = IRWebAPIRequestStateRunning;
if (!_connection) {
self.state = IRWebAPIRequestStateFailed;
[self finish];
}
}
- (void) cancel {
[_connection cancel];
_interceptor.receiver = nil;
[super cancel];
self.state = IRWebAPIRequestStateFailed;
}
- (void) finish {
_connection = nil;
if (self.data)
_result = self.context.parser(self.data);
[self willChangeValueForKey:@"isExecuting"];
[self willChangeValueForKey:@"isFinished"];
_isExecuting = NO;
_isFinished = YES;
[self didChangeValueForKey:@"isExecuting"];
[self didChangeValueForKey:@"isFinished"];
}
- (BOOL) isExecuting {
return _isExecuting;
}
- (BOOL) isFinished {
return _isFinished;
}
- (NSURLRequest *) request {
if (!_request) {
NSURL *url = IRWebAPIRequestURLWithQueryParameters(self.context.baseURL, self.context.queryParams);
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:self.context.timeout];
[self.context.headerFields enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
[request setValue:obj forHTTPHeaderField:key];
}];
if (self.context.body)
[request setHTTPBody:self.context.body];
[request setHTTPMethod:self.context.method];
[request setHTTPShouldHandleCookies:NO];
_request = request;
}
return _request;
}
- (void) connection:(NSURLConnection *)inConnection didReceiveData:(NSData *)inData {
[self.data appendData:inData];
}
- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSCParameterAssert([response isKindOfClass:[NSHTTPURLResponse class]]);
self.context.urlResponse = (NSHTTPURLResponse *)response;
[self.data setLength:0];
}
- (void) connectionDidFinishLoading:(NSURLConnection *)inConnection {
self.state = IRWebAPIRequestStateSucceeded;
[self finish];
}
- (void) connection:(NSURLConnection *)inConnection didFailWithError:(NSError *)error {
self.context.error = error;
self.state = IRWebAPIRequestStateFailed;
[self finish];
}
- (BOOL) connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {
return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}
- (void) connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust])
if ([[self.context.baseURL host] isEqualToString:challenge.protectionSpace.host])
[challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];
[challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
}
- (NSString *) description {
return [NSString stringWithFormat:@"<%@: %p { %@ %@ %@ }>", NSStringFromClass([self class]), self, self.context.engineMethod, self.context.method, self.context.baseURL];
}
@end