Ios 如何在objective c中使用oauth身份验证而不是用户名和密码发送电子邮件

我正在使用一个iPhone应用程序，该应用程序必须允许自动发送电子邮件，而无需任何用户交互（我不能使用MFMailComposeViewController，也不能将用户的用户名/密码存储在像SKPSMTP或MailCore这样的SMTP库中）。 我的想法是，允许用户使用OAuth协议使用他的Gmail帐户登录，然后，在其他时刻，使用之前提供的access_令牌发送电子邮件，而无需重新验证或要求用户提供任何附加数据。 我正在使用GoogleOpenSource.framework和GooglePlus.framework登录用户。 任何建议都会有帮助。

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提前感谢。

您应该能够通过此smtp命令使用OAUTH令牌对GMAIL smtp服务器进行身份验证：

AUTH XOAUTH <your OAUTH token>

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我不熟悉iPhone的开发，因此无法向您提供一些示例代码。但是您需要一个支持扩展身份验证方案的SMTP库。

最后，我找到了解决问题的方法。接下来，我将详细介绍使用OAuth身份验证通过google发送电子邮件的步骤：

对于OAuth登录，我使用了GooglePlus.framework中包含的GPPSignIn类。对于那些可能感兴趣的人，只需按照列出的说明进行操作。 在登录窗口中，完成流程后，将调用下一个委托方法：

- (void)finishedWithAuth: (GTMOAuth2Authentication *)auth error: (NSError *) error {
    NSLog(@"Received error %@ and auth object %@",error, auth);
    if(error) {
        NSLog(@"%@",[error description]);
    }
    else {
        // Get the refresh token.
        self.refreshToken = auth.refreshToken;

        // If you need the user's email you must set the permissions on the GPPSignIn instance.
        // store it locally for future uses.
        self.email = [GPPSignIn sharedInstance].userEmail;
    }
}

然后，为了发送电子邮件，我使用了MailCore的库。 当您希望使用OAuth accessToken发送电子邮件时，首先必须使用您以前在登录过程中保存的刷新令牌获取更新的令牌：

- (void)sendMail {

    GTMOAuth2Authentication * auth = [GTMOAuth2ViewControllerTouch authForGoogleFromKeychainForName:GOOGLE_OAUTH_KEYCHAIN clientID:GOOGLE_CLIENT_ID clientSecret:GOOGLE_CLIENT_SECRET];

    //I use the saved refreshToken    
    auth.refreshToken = refreshToken;


    [auth beginTokenFetchWithDelegate:self
                didFinishSelector:@selector(auth:finishedRefreshWithFetcher:error:)];

}

- (void)auth:(GTMOAuth2Authentication *)auth finishedRefreshWithFetcher:(GTMHTTPFetcher *)fetcher error:(NSError *)error {

    if (error != nil) {
         NSLog(@"Authentication failed");
         return;
    }

    NSString * email = storedEmail;
    NSString * accessToken = [auth accessToken];


    MCOSMTPSession * smtpSession = [[MCOSMTPSession alloc] init];

    smtpSession = [[MCOSMTPSession alloc] init];
    smtpSession.hostname = @"smtp.gmail.com";
    smtpSession.port = 465;
    smtpSession.username = email; //saved value
    smtpSession.connectionType = MCOConnectionTypeTLS;
    smtpSession.password = nil; //nil
    smtpSession.OAuth2Token = accessToken; //saved value
    smtpSession.authType = MCOAuthTypeXOAuth2;

    MCOMessageBuilder * builder = [[MCOMessageBuilder alloc] init];

    MCOAddress *fromAddress = [MCOAddress addressWithMailbox:email];
    MCOAddress *toAddress = [MCOAddress addressWithMailbox:recipientEmail];

    [[builder header] setFrom:fromAddress];
    [[builder header] setTo:toAddresses];
    [[builder header] setSubject:@"Some subject"];
    [builder setHTMLBody:@"some message"];
    NSData * rfc822Data = [builder data];

    MCOSMTPSendOperation *sendOperation = [smtpSession sendOperationWithData:rfc822Data];
    [sendOperation start:^(NSError *error) {
        if(error) {
            NSLog(@"%@ Error sending email:%@", email, error);
        } else {
            NSLog(@"%@ Successfully sent email!", email);
        }
    }];
}

- (void)sendMail {

    GTMOAuth2Authentication * auth = [GTMOAuth2ViewControllerTouch authForGoogleFromKeychainForName:GOOGLE_OAUTH_KEYCHAIN clientID:GOOGLE_CLIENT_ID clientSecret:GOOGLE_CLIENT_SECRET];

    //I use the saved refreshToken    
    auth.refreshToken = refreshToken;


    [auth beginTokenFetchWithDelegate:self
                didFinishSelector:@selector(auth:finishedRefreshWithFetcher:error:)];

}

- (void)auth:(GTMOAuth2Authentication *)auth finishedRefreshWithFetcher:(GTMHTTPFetcher *)fetcher error:(NSError *)error {

    if (error != nil) {
         NSLog(@"Authentication failed");
         return;
    }

    NSString * email = storedEmail;
    NSString * accessToken = [auth accessToken];


    MCOSMTPSession * smtpSession = [[MCOSMTPSession alloc] init];

    smtpSession = [[MCOSMTPSession alloc] init];
    smtpSession.hostname = @"smtp.gmail.com";
    smtpSession.port = 465;
    smtpSession.username = email; //saved value
    smtpSession.connectionType = MCOConnectionTypeTLS;
    smtpSession.password = nil; //nil
    smtpSession.OAuth2Token = accessToken; //saved value
    smtpSession.authType = MCOAuthTypeXOAuth2;

    MCOMessageBuilder * builder = [[MCOMessageBuilder alloc] init];

    MCOAddress *fromAddress = [MCOAddress addressWithMailbox:email];
    MCOAddress *toAddress = [MCOAddress addressWithMailbox:recipientEmail];

    [[builder header] setFrom:fromAddress];
    [[builder header] setTo:toAddresses];
    [[builder header] setSubject:@"Some subject"];
    [builder setHTMLBody:@"some message"];
    NSData * rfc822Data = [builder data];

    MCOSMTPSendOperation *sendOperation = [smtpSession sendOperationWithData:rfc822Data];
    [sendOperation start:^(NSError *error) {
        if(error) {
            NSLog(@"%@ Error sending email:%@", email, error);
        } else {
            NSLog(@"%@ Successfully sent email!", email);
        }
    }];
}