在iPhone应用程序中使用谷歌阅读器API和OAuth

坦率地说,苹果不在乎你是否使用谷歌的非官方API。

我在一个客户的RSS阅读器应用程序上工作,该应用程序使用谷歌阅读器进行同步。我们没有使用OAuth,而是使用标准的HTTP登录,它会返回一个cookie,在该cookie中,您必须从中提取一个令牌,以便在对各种读卡器URL的连续调用中使用。

我可以将我的(旧)概念验证应用程序中的登录代码发布给您。 它使用asihttp和一些自定义字符串类别。其思想是发送一个登录请求,获取响应并从响应的cookie头中提取会话ID/auth代码。然后您可以使用该会话ID/AUTH代码进行连续调用。

#pragma mark -
#pragma mark login

//this is your sessionID token you get from the login
//use this in consecutive calls to google reader
//this method returns you the header string you have to add to your request
//[request addRequestHeader: @"Cookie" value: [self sidHeader]];
- (NSString *) sidHeader
{
    return [NSString stringWithFormat: @"SID=%@", [self sid]];
}

- (NSString *) authHeader
{
    return [NSString stringWithFormat: @"GoogleLogin auth=%@",[self auth]];
}


//login to your google account and get the session ID
- (void) login
{
    NSString *username = @"my.googlelogin@gmail.com";
    NSString *password = @"mypassword123";
    NSString *loginUrl = @"https://www.google.com/accounts/ClientLogin?client=NNW-Mac";
    NSString *source = @"NNW-Mac"; //let's fake NetNewsWire
    NSString *continueUrl = @"http://www.google.com";

    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString: loginUrl]]; // log in & get cookies
    [request addRequestHeader: @"User-Agent" value: @"NetNewsWire/3.2b25 (Mac OS X; http://www.newsgator.com/Individuals/NetNewsWire/)"];

    [request setPostValue: username forKey: @"Email"];
    [request setPostValue: password forKey: @"Passwd"];
    [request setPostValue: @"reader" forKey: @"service"];
    [request setPostValue: source forKey: @"source"];
    [request setPostValue: continueUrl forKey: @"continue"];

    [request setDelegate: self];
    [request setDidFailSelector: @selector(loginRequestFailed:)];
    [request setDidFinishSelector: @selector(loginRequestFinished:)];

    [request start];
}   

-(void)loginRequestFinished:(ASIHTTPRequest *)request
{
    NSString *responseString = [request responseString];

    //login failed
    if ([responseString containsString: @"Error=BadAuthentication" ignoringCase: YES])
    {
        [self setLastError: [self errorWithDescription: @"Bad Username/Passsword" code: 0x001 andErrorLevel: 0x00]];

        if ([delegate respondsToSelector: @selector(gReaderLoginDidFail:)])
        {
            [delegate gReaderLoginDidFail: self];
        }

        return NO;
    }

    //captcha required
    if ([responseString containsString: @"CaptchaRequired" ignoringCase: YES])
    {
        [self setLastError: [self errorWithDescription: @"Captcha Required" code: 0x001 andErrorLevel: 0x00]];

        if ([delegate respondsToSelector: @selector(gReaderLoginDidFail:)])
        {
            [delegate gReaderLoginDidFail: self];
        }

        return NO;
    }

    //extract SID + auth
    NSArray *respArray = [responseString componentsSeparatedByCharactersInSet: [NSCharacterSet newlineCharacterSet]];

    NSString *sidString = [respArray objectAtIndex: 0];
    sidString = [sidString stringByReplacingOccurrencesOfString: @"SID=" withString: @""];
    [self setSid: sidString];

NSString *authString = [respArray objectAtIndex: 2];
authString = [authString stringByReplacingOccurrencesOfString: @"Auth=" withString: @""];
[self setAuth: authString];
    //mesage delegate of success
    if ([delegate respondsToSelector: @selector(gReaderLoginDidSucceed:)])
    {
        [delegate gReaderLoginDidSucceed: self];
    }

    return YES;
}

- (void)loginRequestFailed:(ASIHTTPRequest *)request
{
    NSError *error = [request error];

    //NSLog(@"login request failed with error: %@", [error localizedDescription]);
    [self setLastError: error];

    if ([delegate respondsToSelector: @selector(gReaderLoginDidFail:)])
    {
        [delegate gReaderLoginDidFail: self];
    }

}

登录后,您可以使用sid和auth将请求伪造到读卡器的API端点。

例子:

- (ASIHTTPRequest *) requestForAPIEndpoint: (NSString *) apiEndpoint
{
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString: apiEndpoint]];
    [request addRequestHeader: @"User-Agent" value: @"NetNewsWire/3.2b25 (Mac OS X; http://www.newsgator.com/Individuals/NetNewsWire/)"];
    [request addRequestHeader: @"Cookie" value: [self sidHeader]];
    [request addRequestHeader: @"Authorization" value: [self authHeader]];

    return request;
}

关于谷歌阅读器及其私有API的一篇有趣的文章是 http://timbroder.com/2007/08/google-reader-api-functions.html

请务必阅读最新评论:)

/编辑:我更新了代码以使用auth头(Google在今年6月引入)。我想如果你想使用OAuth的话,这里就是放置你的OAuth令牌的地方。 猜测

我发现:“google data apis objective-c客户端库提供了一个iphone静态库、一个mac os x框架和源代码,使通过google data apis访问数据变得容易。” code.google.com/p/gdata-objectivec-client -太棒了! 但是,它不包括读卡器API(因为它尚未发布)。

我可以通过更改来访问API(在OAuthsampletouch示例中)

NSString *scope = @"http://www.google.com/m8/feeds/";

在oauthsamplerootview controllertouch.m到

NSString *scope = @"http://www.google.com/reader/api/*";

和

urlStr = @"http://www.google.com/m8/feeds/contacts/default/thin";

到

urlStr = @"http://www.google.com/reader/atom/user/-/label/Design";

其中design是文件夹名-选中此项 http://code.google.com/p/pyrfeed/wiki/GoogleReaderAPI 这是一个很大的帮助。

更新

从那时起,我发现这种技术是最好的/最轻的/不那么复杂的: Native Google Reader iPhone Application