iOS：GMail API - 通过电子邮件发送附件

我能够成功发送没有附件的电子邮件。 但是，当我尝试使用 GTLUploadParamaters 上传附件时，出现 501 错误。

我尝试添加照片库中附件的 NSData，以及仅发送图像的 URL。

在这两种情况下我都得到了同样的错误。

// Create the message
GTLGmailMessage *message = [[GTLGmailMessage alloc]init];
message.raw = [self getFormattedRawMessageForMail:mail];

if(!self.gmailService) {
    self.gmailService = [Utilities initializeGmailService];
}
// Get the data of the image present in the photo library
GTLUploadParameters *image = [GTLUploadParameters uploadParametersWithData:[Singleton sharedInstance].dataImage MIMEType:@"image/jpeg"];

GTLQueryGmail *query = [GTLQueryGmail queryForUsersMessagesSendWithUploadParameters:image];
query.userId = [ORBSingleton sharedInstance].userProfile.email;
query.message = message;

[self.gmailService executeQuery:query completionHandler:^(GTLServiceTicket *ticket, GTLGmailMessage *mail, NSError *error) {
    if(!error){
        handler(YES, error);
    }
    else{
        handler(NO, error);
    }
}];

我错过了什么吗？任何帮助将不胜感激。

当添加允许发送最大大小为 35 mb 的邮件的附件时，我没有使用 GTLGmailMessage。

代替base64编码（您当前的解决方案），rfc822用于下面的解决方案中。

// Create the param
GTLUploadParameters *uploadParam = [[GTLUploadParameters alloc] init];
uploadParam.MIMEType = @"message/rfc822";
uploadParam.data = [self getFormattedRawMessageForMail:mail filenames:arrFilenames];

// Create the query
GTLQueryGmail *query = [GTLQueryGmail queryForUsersMessagesSendWithUploadParameters:uploadParam];
query.userId = @"me";

// Execute query
[self.gmailService executeQuery:query completionHandler:^(GTLServiceTicket *ticket, GTLGmailMessage *mail, NSError *error) {

}];

The getFormattedRawMessageForMail:文件名 method

- (NSData *)getFormattedRawMessageForMail:(ORBEmail *)mail filenames:(NSMutableArray *)arrFilenames{

    // Date string
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    dateFormatter.dateFormat = @"EEE, dd MMM yyyy HH:mm:ss Z";
    NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];
    NSString *finalDate = [NSString stringWithFormat:@"Date: %@\r\n", strDate];

    // From string
    NSString *from = @"From: <[email protected] /cdn-cgi/l/email-protection>\r\n”;

    // To string
    NSString *to = @“To: <[email protected] /cdn-cgi/l/email-protection>\r\n”,

    // CC string
    NSString *cc = @“”;
    if(mail.cc.length > 0) {
      cc = [self getFormattedStringForFieldName:SEND_MAIL_CC ForAllReceivers:mail.cc];
    }

    // BCC string
    NSString *bcc = @“”;
    if(mail.bcc.length > 0) {
        bcc = [self getFormattedStringForFieldName:SEND_MAIL_BCC ForAllReceivers:mail.bcc];
    }

    // Subject string
    NSString *subject = @"Subject: Sample Subject\r\n\r\n”;

    // Body string
    NSString *body = @“Sample body\r\n”;

    // Final string to be returned
    NSString *rawMessage = @“”;

    // Depending on whether the email has attachments, the email can either be sent as "text/plain" or "multipart/mixed"
    if (arrFilenames.count > 0) {

        // Send as "multipart/mixed"
        NSString *contentTypeMain = @"Content-Type: multipart/mixed; boundary=\"project\"\r\n";

        // Reusable Boundary string
        NSString *boundary = @"\r\n--project\r\n";

        // Body string
        NSString *contentTypePlain = @"Content-Type: text/plain; charset=\"UTF-8\"\r\n";

        // Combine strings from "finalDate" to "body"
        rawMessage = [[[[[[[[[contentTypeMain stringByAppendingString:finalDate] stringByAppendingString:from]stringByAppendingString:to]stringByAppendingString:cc]stringByAppendingString:bcc]stringByAppendingString:subject]stringByAppendingString:boundary]stringByAppendingString:contentTypePlain]stringByAppendingString:body];

        // Attachments strings
        for (NSString *filename in arrFilenames) {

            // Image Content Type string
            NSString *contentTypePNG = boundary;
            contentTypePNG = [contentTypePNG stringByAppendingString:[NSString stringWithFormat:@"Content-Type: image/png; name=\"%@\"\r\n",filename]];
            contentTypePNG = [contentTypePNG stringByAppendingString:@"Content-Transfer-Encoding: base64\r\n"];

            // PNG image data
            NSData *pngData = UIImagePNGRepresentation([Utilities getImageFromFolder:FOLDER_UPLOADS filename:filename]);
            NSString *pngString = [NSString stringWithFormat:@"%@\r\n",GTLEncodeBase64(pngData)];
            contentTypePNG = [contentTypePNG stringByAppendingString:pngString];

            // Add to raw message
            rawMessage = [rawMessage stringByAppendingString:contentTypePNG];
        }

        // End string
        rawMessage = [rawMessage stringByAppendingString:@"\r\n--project--"];

    }else{

        // Send as "text/plain"
        rawMessage = [[[[[[finalDate stringByAppendingString:from]stringByAppendingString:to]stringByAppendingString:cc]stringByAppendingString:bcc]stringByAppendingString:subject]stringByAppendingString:body];

    }

    return [rawMessage dataUsingEncoding:NSUTF8StringEncoding];
}

如果电子邮件有附件，则 rawMessage 字符串的内容应如下所示。

Content-Type: multipart/mixed; boundary=“project”
Date: Fri, 08 Jul 2016 14:25:32 +0800
From: <[email protected] /cdn-cgi/l/email-protection>
To: <[email protected] /cdn-cgi/l/email-protection>
Subject: Sample Subject

--project
Content-Type: text/plain; charset="UTF-8"
Sample body

--project
Content-Type: image/png; name=“SampleImage1.jpg"
Content-Transfer-Encoding: base64

<Image data>

--project
Content-Type: image/png; name=“SampleImage2.jpg"
Content-Transfer-Encoding: base64

<Image data>

--project--