OAuthConsumer.frameworkを使う(TwitterへPOST)

動機
前回の物を使ってみるため，あちらこちらのサンプルを継ぎ接ぎして（例えば）以下の様にしたら動いた．．

やってみた．
フレームワークの追加

~/Library/Frameworks/のOAuthConsumer.frameworkを追加
/System/Library/Framewokrs/のSecurity.frameworkを追加

フレームワークの利用のためのHeader

#import <OAuthConsumer/OAuthConsumer.h>

インスタンス変数

    OAConsumer *consumer;

    OAToken *accessToken;

インスタンス変数の初期化

        consumer = [[OAConsumer alloc] initWithKey:@"[Consumer Key]"

                                            secret:@"[Consumer Secret Key]"];

        accessToken= nil;

Consumer Key/Consumer Secret KeyはTwitterの開発者サイトで登録し取得する．

ConsumerKey/ConsumerSecretKeyからRequestTokenを取得へ

- (void)requestRequestToken

{    

    NSURL *url = [NSURL URLWithString:@"https://api.twitter.com/oauth/request_token"];

    

    OAMutableURLRequest *request = [[OAMutableURLRequest alloc] initWithURL:url

                                                                   consumer:consumer

                                                                      token:nil

                                                                      realm:nil

                                                          signatureProvider:nil]; 

    

    [request setHTTPMethod:@"POST"];

    

    OADataFetcher *fetcher = [[[OADataFetcher alloc] init] autorelease];

    

    [fetcher fetchDataWithRequest:request

                         delegate:self

                didFinishSelector:@selector(requestTokenTicket:didFinishWithData:)

                  didFailSelector:@selector(requestTokenTicket:didFailWithError:)];

}

- (void)requestTokenTicket:(OAServiceTicket *)ticket 

         didFinishWithData:(NSData *)data 

{

    if (ticket.didSucceed) {

      …

    }

}

- (void)requestTokenTicket:(OAServiceTicket *)ticket 

          didFailWithError:(NSError *)error

{

    NSLog(@"%@", error);

}

RequestTokenから認証のWebページ(PIN)の取得へ

- (void)requestTokenTicket:(OAServiceTicket *)ticket 

         didFinishWithData:(NSData *)data 

{

    if (ticket.didSucceed) {

        OAMutableURLRequest *request;

        NSString *responseBody = [[NSString alloc] initWithData:data

                                                       encoding:NSUTF8StringEncoding];

        

        if (accessToken != nil) {

            [accessToken release];

            accessToken = nil;

        }

        

        accessToken = [[OAToken alloc] initWithHTTPResponseBody:responseBody];

        [responseBody release];

        

        NSURL *url = [NSURL URLWithString:@"https://api.twitter.com/oauth/authorize"];

        

        request = [[[OAMutableURLRequest alloc] initWithURL:url

                                                   consumer:consumer

                                                      token:accessToken

                                                      realm:nil

                                          signatureProvider:nil] autorelease];

        

        

        OARequestParameter *p0 = [[OARequestParameter alloc] initWithName:@"oauth_token"

                                                                    value:accessToken.key];

        NSArray *params = [NSArray arrayWithObject:p0];

        [request setParameters:params];

        

        [[NSWorkspace sharedWorkspace] openURL:[request URL]];

        

        [p0 release];

    }

    else {

        

    }



}

(デフォルトブラウザでURLが開かれる．ここではTwitterサイトでの認証であり数字キー(PIN)が手に入る

PINからAccessTokenの取得へ

- (void)authorizationWithPin:(NSString *)pin

{

    OAMutableURLRequest *request;

    OADataFetcher *fetcher;

    

    NSURL *url = [NSURL URLWithString:@"https://api.twitter.com/oauth/access_token"];

    

    request = [[[OAMutableURLRequest alloc] initWithURL:url

                                               consumer:consumer

                                                  token:accessToken

                                                  realm:nil

                                      signatureProvider:nil] autorelease];

    

    

    OARequestParameter *p0 = [[OARequestParameter alloc] initWithName:@"oauth_token"

                                                                value:accessToken.key];

    OARequestParameter *p1 = [[OARequestParameter alloc] initWithName:@"oauth_verifier"

                                                                value:pin];

    NSArray *params = [NSArray arrayWithObjects:p0, p1, nil];

    [request setParameters:params];

    

    fetcher = [[[OADataFetcher alloc] init] autorelease];

    

    [fetcher fetchDataWithRequest:request

                         delegate:self

                didFinishSelector:@selector(accessTokenTicket:didFinishWithData:)

                  didFailSelector:@selector(accessTokenTicket:didFailWithError:)];

    

    [p0 release];

    [p1 release];

}

- (void)accessTokenTicket:(OAServiceTicket *)ticket 

        didFinishWithData:(NSData *)data 

{

    if (ticket.didSucceed) {        

    …

    }

}

- (void)accessTokenTicket:(OAServiceTicket *)ticket 

         didFailWithError:(NSError *)error

{

    NSLog(@"%@", error);

}

accessTokenを生成してDefaultUserInfoへ保存

- (void)accessTokenTicket:(OAServiceTicket *)ticket 

        didFinishWithData:(NSData *)data 

{

    if (ticket.didSucceed) {        

        NSString *responseBody = [[NSString alloc] initWithData:data

                                                       encoding:NSUTF8StringEncoding];

        

        if (accessToken != nil) {

            [accessToken release];

            accessToken = nil;

        }

        

        accessToken = [[OAToken alloc] initWithHTTPResponseBody:responseBody];

        [responseBody release];

        

        [accessToken storeInUserDefaultsWithServiceProviderName:@"NAME"

                                                         prefix:@"KEY"];

        

    }

}

（ちなみにDeaultUserInfoから取り出すときは

	accessToken= [[OAToken alloc] initWithUserDefaultsUsingServiceProviderName:@"NAME"

                                                                        prefix:@"KEY"];

)

accessTokenを使ってPOSTしてみる

　NSString *message= @"Hello World!";



    NSURL *url= [NSURL URLWithString:@"http://api.twitter.com/1/statuses/update.xml"];

    OAMutableURLRequest *requestWithBodyParams = [[[OAMutableURLRequest alloc] initWithURL:url

                                                                                 consumer:consumer

                                                                                    token:accessToken   

                                                                                    realm:nil   

                                                                        signatureProvider:nil] autorelease];

    NSString *encodedParameterPairs= [NSString stringWithFormat:@"status=%@", [message URLEncodedString]];

    NSData *requestData = [encodedParameterPairs dataUsingEncoding:NSASCIIStringEncoding 

                                              allowLossyConversion:YES];

    [requestWithBodyParams setHTTPBody:requestData];

    [requestWithBodyParams setValue:[NSString stringWithFormat:@"%d", [requestData length]] 

                 forHTTPHeaderField:@"Content-Length"];

    [requestWithBodyParams setValue:@"application/x-www-form-urlencoded"

                 forHTTPHeaderField:@"Content-Type"];    

    [requestWithBodyParams setHTTPMethod:@"POST"];



    OADataFetcher *fetcher = [[[OADataFetcher alloc] init] autorelease];



    [fetcher fetchDataWithRequest:requestWithBodyParams 

                         delegate:self

                didFinishSelector:@selector(apiTicket:didFinishWithData:)

                  didFailSelector:@selector(apiTicket:didFailWithError:)];

- (void)apiTicket:(OAServiceTicket *)ticket 

didFinishWithData:(NSData *)data 

{

    …

}

- (void)apiTicket:(OAServiceTicket *)ticket 

 didFailWithError:(NSError *)error 

{

    NSLog(@"%@", error);

}

結果
http://twitter.com/#!/p_g_/status/100810688833912833