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　　在現(xiàn)階段飲食類的APP發(fā)展的非常迅猛，尤其在校園中，學(xué)生只需要憑借一個手機(jī)就能買到自己想要的食物，真正做到了足不出戶?？墒侨绻覀兿氇?dú)立完成一個app就需要有相應(yīng)的數(shù)據(jù)支持，這里給大家介紹一個國外的開發(fā)API, FatSecret Platform?API,這里面包含了許多的食物信息。我們根據(jù)這些信息，就能夠請求我們的數(shù)據(jù)，進(jìn)行獨(dú)立的app開發(fā)。

1、api地址

　　http://platform.fatsecret.com/api/Default.aspx?screen=rapih

2、Authentication 認(rèn)證

這里要注意，Authentication是難點(diǎn)也是重點(diǎn)，下面我們一起研究研究怎么進(jìn)行認(rèn)證。

Note that you must be?signed up as a developer, and agree to our?Terms of Service?in order to obtain you?Consumer Key?andShared Secret, which you'll need to send requests to the REST API.?

　　Api中提到，如果我們需要使用api必須首先注冊為開發(fā)者，并且獲取到Consumer Key?andShared Secret，這兩個東西。好既然這樣我們就開始獲取,按照網(wǎng)站注冊后如會獲取如下數(shù)據(jù)

有了這個東西我們就可以進(jìn)行下一步了。繼續(xù)瀏覽API的Authentication

看到這我們會發(fā)現(xiàn)想要請求api必須還得獲取一個signature ,而且上面給我們提供了步驟。好那我們就接著往下看

Step 1. Creating a Signature Base String

意思就是說，我們需要將字段和方法按照順序拼接出下面的形式，其中的轉(zhuǎn)碼我們用的是RFC3986

POST?&?http%3A%2F%2Fplatform.fatsecret.com%2Frest%2Fserver.api?&a%3Dbar%26%26oauth_consumer_key%3Ddemo%26oauth_nonce%3Dabc%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D12345678%26oauth_version%3D1.0%26z%3Dbar

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　　Step 2. Calculating the Signature value (oauth_signature)

意思是說需要進(jìn)一步RFC2104和RFC2045和RFC3986進(jìn)行轉(zhuǎn)碼

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Step 3. Sending the Request

Send all the parameters used to generate the Signature Base String via the HTTP method specified in the Signature Base String, with the inclusion of the?oauth_signature.

That's it! We will hopefully be able to generate the same?oauth_signature?from our end and confirm that it is indeed you

　　好，看到這里大家肯定有些模糊，沒關(guān)系，我們有代碼幫助大家理解，上面的api步驟，我通過代碼翻譯如下

/***  <#Description#>**  @param url                  請求的地址*  @param method               請求的方法*  @param body                 body數(shù)據(jù)*  @param _oAuthConsumerKey    申請的key*  @param _oAuthConsumerSecret  申請的Secret*  @param _oAuthToken          暫時用不到*  @param _oAuthTokenSecret    暫時用不到**  @return <#return value description#>*/
NSString *OAuthorizationHeader(NSURL *url, NSString *method, NSData *body, NSString *_oAuthConsumerKey, NSString *_oAuthConsumerSecret, NSString *_oAuthToken, NSString *_oAuthTokenSecret)
{NSString *_oAuthNonce = [NSString ab_GUID];NSString *_oAuthTimestamp = [NSString stringWithFormat:@"%d", (int)[[NSDate date] timeIntervalSince1970]];NSString *_oAuthSignatureMethod = @"HMAC-SHA1";NSString *_oAuthVersion = @"1.0";NSMutableDictionary *oAuthAuthorizationParameters = [NSMutableDictionary dictionary];[oAuthAuthorizationParameters setObject:_oAuthNonce forKey:@"oauth_nonce"];[oAuthAuthorizationParameters setObject:_oAuthTimestamp forKey:@"oauth_timestamp"];[oAuthAuthorizationParameters setObject:_oAuthSignatureMethod forKey:@"oauth_signature_method"];[oAuthAuthorizationParameters setObject:_oAuthVersion forKey:@"oauth_version"];[oAuthAuthorizationParameters setObject:_oAuthConsumerKey forKey:@"oauth_consumer_key"];if(_oAuthToken)[oAuthAuthorizationParameters setObject:_oAuthToken forKey:@"oauth_token"];// get query and body parametersNSDictionary *additionalQueryParameters = [NSURL ab_parseURLQueryString:[url query]];NSDictionary *additionalBodyParameters = nil;if(body) {NSString *string = [[NSString alloc] initWithData:body encoding:NSUTF8StringEncoding];if(string) {additionalBodyParameters = [NSURL ab_parseURLQueryString:string];}}// combine all parametersNSMutableDictionary *parameters = [oAuthAuthorizationParameters mutableCopy];if(additionalQueryParameters) [parameters addEntriesFromDictionary:additionalQueryParameters];if(additionalBodyParameters) [parameters addEntriesFromDictionary:additionalBodyParameters];// -> UTF-8 -> RFC3986NSMutableDictionary *encodedParameters = [NSMutableDictionary dictionary];for(NSString *key in parameters) {NSString *value = [parameters objectForKey:key];[encodedParameters setObject:[value ab_RFC3986EncodedString] forKey:[key ab_RFC3986EncodedString]];}NSArray *sortedKeys = [[encodedParameters allKeys] sortedArrayUsingFunction:SortParameter context:(__bridge void *)(encodedParameters)];NSMutableArray *parameterArray = [NSMutableArray array];for(NSString *key in sortedKeys) {[parameterArray addObject:[NSString stringWithFormat:@"%@=%@", key, [encodedParameters objectForKey:key]]];}NSString *normalizedParameterString = [parameterArray componentsJoinedByString:@"&"];NSString *normalizedURLString;if ([url port] == nil) {normalizedURLString = [NSString stringWithFormat:@"%@://%@%@", [url scheme], [url host], [url path]];} else {normalizedURLString = [NSString stringWithFormat:@"%@://%@:%@%@", [url scheme], [url host], [url port], [url path]];}NSString *signatureBaseString = [NSString stringWithFormat:@"%@&%@&%@",[method ab_RFC3986EncodedString],[normalizedURLString ab_RFC3986EncodedString],[normalizedParameterString ab_RFC3986EncodedString]];NSString *key = [NSString stringWithFormat:@"%@&%@",[_oAuthConsumerSecret ab_RFC3986EncodedString],[_oAuthTokenSecret ab_RFC3986EncodedString]];NSData *signature = HMAC_SHA1(signatureBaseString, key);NSString *base64Signature = [signature base64EncodedString];// PARKER CHANGE: changed oAuthAuthorizationParameters to parametersNSMutableDictionary *authorizationHeaderDictionary = [parameters mutableCopy];[authorizationHeaderDictionary setObject:base64Signature forKey:@"oauth_signature"];NSMutableArray *authorizationHeaderItems = [NSMutableArray array];for(NSString *key in authorizationHeaderDictionary) {NSString *value = [authorizationHeaderDictionary objectForKey:key];// PARKER CHANGE: removed quotes that surrounded each value[authorizationHeaderItems addObject:[NSString stringWithFormat:@"%@=%@",[key ab_RFC3986EncodedString],[value ab_RFC3986EncodedString]]];}// PARKER CHANGE: changed concatentation string from ", " to "&"NSString *authorizationHeaderString = [authorizationHeaderItems componentsJoinedByString:@"&"];
//  authorizationHeaderString = [NSString stringWithFormat:@"OAuth %@", authorizationHeaderString];return authorizationHeaderString;
}

使用方法如下：

#pragma mark - 請求方法
-(void) connentSign{//設(shè)置食物IDNSDictionary *params = @{@"food_id" : @"33690"};//設(shè)置請求參數(shù)和方法名[self makeRequestWithMethod:@"food.get" parameters:params completion:^(NSDictionary *data) {}];}//開始發(fā)送請求
- (void) makeRequestWithMethod:(NSString *)methodparameters:(NSDictionary *)paramscompletion:(void (^)(NSDictionary *data))completionBlock {NSMutableDictionary *parameters = [params mutableCopy];[parameters addEntriesFromDictionary:[self defaultParameters]];[parameters addEntriesFromDictionary:@{ @"method" : method }];NSString *queryString = [self queryStringFromDictionary:parameters];NSData *data          = [NSData dataWithBytes:[queryString UTF8String] length:queryString.length];NSString *authHeader  = OAuthorizationHeader([NSURL URLWithString:FAT_SECRET_API_ENDPOINT],@"GET",data,@"9921d3f511a542a8b32b8841bb1d62ed",@"f8fa1d96494046c69159099ab153ea1e",nil,@"");[self.manager GET:[FAT_SECRET_API_ENDPOINT stringByAppendingFormat:@"?%@", authHeader] parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {NSLog(@"%@",responseObject);} failure:^(AFHTTPRequestOperation *operation, NSError *error) {}];}- (NSDictionary *) defaultParameters {return @{ @"format": @"json" };
}- (NSString *) queryStringFromDictionary:(NSDictionary *)dict {NSMutableArray *entries = [@[] mutableCopy];for (NSString *key in dict) {NSString *value = [dict objectForKey:key];[entries addObject:[NSString stringWithFormat:@"%@=%@", key, value]];}return [entries componentsJoinedByString:@"&"];
}

然后我們就可以Happy programming!

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作者： 杰瑞教育
出處： http://www.cnblogs.com/jerehedu/?
本文版權(quán)歸煙臺杰瑞教育科技有限公司和博客園共有，歡迎轉(zhuǎn)載，但未經(jīng)作者同意必須保留此段聲明，且在文章頁面明顯位置給出原文連接，否則保留追究法律責(zé)任的權(quán)利。