邮件附件错误的媒体类型Gmail API [英] Mail attachment wrong media type Gmail API
问题描述
我在Javascript客户端通过Gmail API发送一封附有jpeg文件的邮件。到目前为止我写的代码如下:
I'm trying to send a message with a jpeg file attached through the Gmail API in Javascript client side. The code I've written so far is as follows:
$.ajax({
type: "POST",
url: "https://www.googleapis.com/upload/gmail/v1/users/me/messages/send?uploadType=multipart",
headers: {
'Authorization': 'Bearer ' + accessToken,
'Content-Type': 'multipart/related; boundary="foo_bar_baz"'
},
data: data
});
其中数据
是一个建立起来的字符串在这里找到的示例:
Where data
is a string built up like the example found here:
--foo_bar_baz
Content-Type: application/json; charset=UTF-8
{
"raw": "RnJvbTogRW1pbCBUaG9saW4gPGVtdGhvbGluQGdtYWlsLmNvbT4KVG86IEV4YW1wbGUgTmFtZSA8ZW10aG9saW5AZ21haWwuY29tPgpTdWJqZWN0OiBzZHNkCgpzZHNk"
}
--foo_bar_baz
Content-Type: image/jpeg
data:image_jpeg;base64,_9j_4AAQSkZJRgABAQEAYABgAAD_2wBDAAIBAQIBAQICAgICAgIC…bHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3-Pn6_9oADAMBAAIRAxEAPwD-f-iiigD_2Q==
--foo_bar_baz--
我得到的错误是不支持媒体类型'image / jpeg'。有效的媒体类型:[message / rfc822]
,这是可以理解的,因为 [message / rfc822]
是媒体唯一有效的MIME类型到规范,但上面链接的示例另有说明
The error I get is Media type 'image/jpeg' is not supported. Valid media types: [message/rfc822]
, which is understandable since [message/rfc822]
is the only valid MIME-type for the media according to the specification, but the example linked above states otherwise.
我做错了什么?非常感谢有人可以在此轻视一下!
What am I doing wrong? It would be much appreciated if someone could shed some light on this!
推荐答案
编辑
第一段代码适用于组合大小为几MB的附件。如果要使用允许的限制为35 mb,请在答案结束时检查编辑。
EDIT
This first piece of code works for attachments with a combined size of a few mb. If you want to use the allowed limit of 35 mb, check the edit at the end of the answer.
之后Steve推动我正确的方向(整个邮件必须在raw-parameter),我只是尝试Python API,并查看由该生成的邮件。
After Steve pushed me in the right direction (the entire mail has to be in the "raw"-parameter), I simply tried the Python API and looked at the mail generated by that.
没有附件的邮件
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
to: receiver@gmail.com
from: sender@gmail.com
subject: Subject Text
The actual message text goes here
邮件附件
Content-Type: multipart/mixed; boundary="foo_bar_baz"
MIME-Version: 1.0
to: receiver@gmail.com
from: sender@gmail.com
subject: Subject Text
--foo_bar_baz
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
The actual message text goes here
--foo_bar_baz
Content-Type: image/jpeg
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="example.jpg"
{JPEG data}
--foo_bar_baz--
所以我刚刚写了我的代码,这个工作很棒!
So I just wrote my code around this, and it worked great!
var reader = new FileReader();
reader.readAsDataURL(attachment);
reader.onloadend = function (e) {
// The relevant base64-encoding comes after "base64,"
var jpegData = e.target.result.split('base64,')[1];
var mail = [
'Content-Type: multipart/mixed; boundary="foo_bar_baz"\r\n',
'MIME-Version: 1.0\r\n',
'to: receiver@gmail.com\r\n',
'from: sender@gmail.com\r\n',
'subject: Subject Text\r\n\r\n',
'--foo_bar_baz\r\n',
'Content-Type: text/plain; charset="UTF-8"\r\n',
'MIME-Version: 1.0\r\n',
'Content-Transfer-Encoding: 7bit\r\n\r\n',
'The actual message text goes here\r\n\r\n',
'--foo_bar_baz\r\n',
'Content-Type: image/jpeg\r\n',
'MIME-Version: 1.0\r\n',
'Content-Transfer-Encoding: base64\r\n',
'Content-Disposition: attachment; filename="example.jpg"\r\n\r\n',
jpegData, '\r\n\r\n',
'--foo_bar_baz--'
].join('');
// The Gmail API requires url safe Base64
// (replace '+' with '-', replace '/' with '_', remove trailing '=')
mail = btoa(mail).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
$.ajax({
type: "POST",
url: "https://www.googleapis.com/gmail/v1/users/me/messages/send",
headers: {
'Authorization': 'Bearer ' + accessToken,
'Content-Type': 'application/json'
},
data: JSON.stringify({
raw: mail
})
});
}
编辑
上面的代码可以使用,但需要一些更改才能使用最大限制为35 mb。
Edit
The code above works, but a few alterations are needed to use the max limit of 35 mb.
使用邮件内置作为示例,在标题邮件附件下,更改的ajax请求如下所示:
With a mail built up as the example under the heading Mail with attachment, the altered ajax-request looks as follows:
$.ajax({
type: "POST",
url: "https://www.googleapis.com/gmail/v1/users/me/messages/send?uploadType=multipart",
headers: {
'Authorization': 'Bearer ' + accessToken,
'Content-Type': 'message/rfc822'
},
data: mail
});
内容类型
现在是code> message / rfc822 而不是 application / json
,该url已经得到一个新参数 uploadType = multipart
,最重要的是邮件不再是Base64编码,而是在 rfc822
-format中提供。
The Content-Type
is now message/rfc822
instead of application/json
, the url has gotten a new parameter uploadType=multipart
, and most importantly the mail is no longer Base64 encoded, but supplied in the rfc822
-format.
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