AFHTTPFileUpdateOperation/AFHTTPFileUpdateOperation.m at master · samnung/AFHTTPFileUpdateOperation · GitHub

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//
// AFHTTPFileUpdateOperation.m
//
// Created by Roman Kříž on 19.07.13.
// Copyright (c) 2013 samnung. All rights reserved.
//

#import"AFHTTPFileUpdateOperation.h"

// WEAK()
#import<SAMWeak/SAMWeak.h>


#defineHTTP_NOT_MODIFIED_CODE304

@implementationAFHTTPFileUpdateOperation

- (NSString *) formatDate:(NSDate *)date
{
staticdispatch_once_t onceToken;
staticNSDateFormatter * formatter = nil;
dispatch_once(&onceToken, ^{
 formatter = [[NSDateFormatteralloc] init];
 formatter.dateFormat = @"EEE, dd MMM yyyy HH:mm:ss 'GMT'";
 formatter.locale = [[NSLocalealloc] initWithLocaleIdentifier:@"en_US"];
 formatter.timeZone = [NSTimeZonetimeZoneForSecondsFromGMT:0];
	});

return [formatter stringFromDate:date];
}

- (dispatch_queue_t) processingQueue
{
staticdispatch_once_t onceToken;
staticdispatch_queue_t queue;
dispatch_once(&onceToken, ^{
 queue = dispatch_queue_create("com.alamofire.networking.local-file-update.processing", 0);
	});
return queue;
}

- (instancetype) initWithRequest:(NSURLRequest *)urlRequestlocalPath:(NSString *)path
{
NSFileManager * mgr = [NSFileManagerdefaultManager];

BOOL dir = NO;

// needToDownload = file didn't exists and is not a folder
BOOL needToDownload = ! [mgr fileExistsAtPath:path isDirectory:&dir] && ! dir;
if ( needToDownload )
	{
 self = [superinitWithRequest:urlRequest];
	}
elseif ( dir )
	{
NSLog(@"Cannot update file at: `%@', is a folder!", path);
 self = nil;
	}
else
	{
// --- getting info about file
NSDictionary * info = [mgr attributesOfItemAtPath:path error:nil];
NSDate * time = info[NSFileModificationDate];

// --- add If-Modified-Since header to request
NSMutableURLRequest * request = urlRequest.mutableCopy;
 [request setValue:[selfformatDate:time] forHTTPHeaderField:@"If-Modified-Since"];

 self = [superinitWithRequest:request];
	}

if ( self )
	{
 _localPath = path;
	}

return self;
}

- (instancetype) initWithRequest:(NSURLRequest *)urlRequest
{
NSLog(@"Don't use %s in class %@, instead use initWithRequest:localPath: !", __PRETTY_FUNCTION__, [[selfclass] description]);
returnnil;
}

+ (NSSet *) acceptableContentTypes
{
returnnil;
}

+ (BOOL) canProcessRequest:(NSURLRequest *)request
{
returnYES;
}

+ (NSIndexSet *) acceptableStatusCodes
{
NSMutableIndexSet * set = [superacceptableStatusCodes].mutableCopy;
	[set addIndex:HTTP_NOT_MODIFIED_CODE];
return set;
}

- (void) setCompletionBlockWithSuccess:(void (^)(AFHTTPFileUpdateOperation *operation, NSData * data))successfailure:(void (^)(AFHTTPFileUpdateOperation *operation, NSError *error))failure
{
WEAK(self);

 self.completionBlock = ^
	{
if ( [_self isCancelled] )
return;

// not modified
if ( _self.response.statusCode == HTTP_NOT_MODIFIED_CODE )
 {
if ( success )
 {
NSData * data = [NSDatadataWithContentsOfFile:_self.localPath options:NSDataReadingMappedIfSafe error:nil];
dispatch_async( _self.successCallbackQueue ?: dispatch_get_main_queue(), ^{
success(_self, data);
 });
 }
 }
elseif (_self.error)
 {
if (failure)
 {
dispatch_async(_self.failureCallbackQueue ?: dispatch_get_main_queue(), ^{
failure(_self, _self.error);
 });
 }
 }
else
 {
dispatch_async([_self processingQueue], ^
 {
NSData * data = _self.responseData;
NSError * error = nil;

if ( ! [data writeToFile:_self.localPath options:NSDataWritingAtomic error:&error] )
 {
if ( failure )
 {
dispatch_async( _self.failureCallbackQueue ?: dispatch_get_main_queue(), ^{
failure(_self, error);
 });
 }
 }
else
 {
if ( success )
 {
dispatch_async( _self.successCallbackQueue ?: dispatch_get_main_queue(), ^{
success(_self, data);
 });
 }
 }
 });
 }
 };
}

@end