gistfile1.m

//
//  EBVKAPI.m
//  anyMusicAnywhere
//
//  Created by Eric_Bro on 28.02.11.
//  Copyright 2011 DevStudio. All rights reserved.
//

#import "EBVKAPI.h"



NSDictionary* dictionaryWithSessionParametersFromVKAPI(NSString* email,
                                                       NSString* password) {
	
    // Посылаем "пустой" запрос - для того чтобы получить куки.
	NSURL *url = [NSURL URLWithString:
				  [NSString stringWithFormat:@"http://vk.com/login.php?email=%@&pass=%@&m=1",email,password]];
	NSData *empty_request = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:url] 
																			   returningResponse:nil 
																						   error:nil];
    empty_request = nil;
	
	// Получаем исходный код страницы авторизации
	NSString *new_url = [NSString stringWithFormat:@"http://vk.com/login.php?app=%@&layout=popup&type=browser&settings=16383",sAPI_ID);
	NSData *raw_data = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:new_url]] 
																		  returningResponse:nil 
																					  error:nil];
	NSString *pageSource = [[NSString alloc] initWithData:raw_data encoding: NSASCIIStringEncoding];
	
	// Проверка пароля\мыла
	if ([pageSource rangeOfString:@"var app_settings_hash = \'\';"].length != 0) {
		NSLog(@"Wrong pass or\\and email!");
        exit(-1);
	}
	
	// Ищем в коде значение переменной "auth_hash"
	NSString *auth_hash = getStringBetweenStrings(@"var auth_hash = \'",@"\';",pageSource);
	// Получаем параметры сессии
    JSONDecoder *decoder = [JSONDecoder decoder];
    
    [pageSource release];

    return [decoder parseJSONData:[NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:                                                                                                     [NSString stringWithFormat:@"http://vk.com/login.php?act=a_auth&app=%@&hash=%@&permanent=1",sAPI_ID,auth_hash]]] 
                                                        returningResponse:nil 
                                                                    error:nil]];
}

NSDictionary * executeAPIMethod(NSString* nameOfMethod,
                                NSMutableDictionary* parametersOfMethod,
                                NSString* formatOfAnswer, 
                                NSDictionary *sessionVar) {
	
	NSString *bodyOfRequest =@"";
	NSString *sig = @"";
    sig = [sig stringByAppendingFormat:@"%@",[sessionVar objectForKey:@"mid"]];	
    
	[parametersOfMethod setObject:sAPI_ID
			   forKey:@"api_id"];
	[parametersOfMethod setObject:formatOfAnswer
			   forKey:@"format"];
	[parametersOfMethod setObject:@"3.0"
			   forKey:@"v"];
	[parametersOfMethod setObject:nameOfMethod 
			   forKey:@"method"];

	
	NSArray *arrayOfAllKeys = [[parametersOfMethod allKeys] sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
	
     for (id obj in arrayOfAllKeys){
		bodyOfRequest = [bodyOfRequest stringByAppendingFormat:@"&%@=%@",
						 (NSString*)obj, [[parametersOfMethod objectForKey:obj] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
		
		sig = [sig stringByAppendingFormat:@"%@=%@",
			   (NSString*)obj, [parametersOfMethod objectForKey:obj]];	
	}
	    
    sig = [sig stringByAppendingFormat:@"%@",[sessionVar objectForKey:@"secret"]];
	sig = MD5(sig);
    bodyOfRequest = [bodyOfRequest substringFromIndex:1];
	bodyOfRequest = [bodyOfRequest stringByAppendingFormat:@"&sid=%@&sig=%@",[sessionVar valueForKey:@"sid"],sig];
    
    
	NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:
									[NSURL URLWithString:
									 [NSString stringWithFormat:@"http://api.vkontakte.ru/api.php?%@",bodyOfRequest]]];
	NSData *VKanswer = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 
	return [[JSONDecoder decoder] parseJSONData:VKanswer];
}

NSString* getStringBetweenStrings(NSString *first,NSString*second,NSString*main){
	NSRange rangeofFirst = [main rangeOfString:first];
	NSRange rangeOfSecond = [main rangeOfString:second];
	if ((rangeofFirst.length == 0) || (rangeOfSecond.length == 0)) {
		return nil;
	}
	NSString *result = [[main substringFromIndex:rangeofFirst.location+rangeofFirst.length] 
						substringToIndex:
						[[main substringFromIndex:rangeofFirst.location+rangeofFirst.length] rangeOfString:second].location];
	return result;
}

NSString* MD5(NSString*input) {
    const char* str = [input UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(str, strlen(str), result);
	
    NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH*2];
    for(int i = 0; i<CC_MD5_DIGEST_LENGTH; i++) {
        [ret appendFormat:@"%02x",result[i]];
    }
    return ret;
}