根据mimeType在哪里找到电子邮件正文 [英] Where to find body of email depending of mimeType

问题描述

我正在向User.messages端点发出请求.返回的所有对象(电子邮件)都具有mimeType属性，我很难理解.

I am making a request to the User.messages endpoint. All objects returned (the emails) have a mimeType property which I'm struggling to understand.

更具体地说，我希望能够根据mimeType提取电子邮件的正文，因为我已经注意到，根据mimeType，正文将位于payload中的body属性内，或parts数组中.可以返回哪些不同的mimeType，我在哪里可以找到其中的每一个电子邮件的正文?

More specifically, I want to be able to extract the body of the email depending of the mimeType since I've been able to notice that depending on the mimeType, the body will be inside the body property in payload, or in the parts array. What are the different mimeTypes that can be returned, and where can I find the body of the email for each one of them?

推荐答案

我认为，如果您将payload本身视为part，这将是有意义的.假设我发送的消息仅包含主题和简单的消息文本:

I think it will make sense if you think of the payload as a part in of itself. Let's say I send a message with just a subject and a plain message text:

From: [e-mail]
To: [e-mail]
Subject: Example Subject

This is the plain text message

这将导致以下已解析的消息:

This will result in the following parsed message:

{
 "id": "154ecb53c10b74d8",
 "threadId": "154ecb53c10b74d8",
 "labelIds": [
  "INBOX",
  "SENT"
 ],
 "snippet": "This is the plain text message",
 "historyId": "38877",
 "internalDate": "1464260181000",
 "payload": {
  "partId": "",
  "mimeType": "text/plain",
  "filename": "",
  "headers": [
   ...
  ],
  "body": {
   "size": 31,
   "data": "VGhpcyBpcyB0aGUgcGxhaW4gdGV4dCBtZXNzYWdlCg=="
  }
 },
 "sizeEstimate": 355
}

如果我发送的消息中包含纯文本部分，html部分和图像，则在解析时，它将看起来像这样:

If I send a message with a plain text part, a html part and an image, it will look like this when parsed:

{
 "id": "154ed5ccaa12f3df",
 "threadId": "154ed5ccaa12f3df",
 "labelIds": [
  "SENT",
  "INBOX",
  "IMPORTANT"
 ],
 "snippet": "This is a plain/html message with an image.",
 "historyId": "841379",
 "internalDate": "1464271162000",
 "payload": {
  "mimeType": "multipart/mixed",
  "filename": "",
  "headers": [
     ...
  ],
  "body": {
   "size": 0
  },
  "parts": [
   {
    "mimeType": "multipart/alternative",
    "filename": "",
    "headers": [
     {
      "name": "Content-Type",
      "value": "multipart/alternative; boundary=089e0122896c7c80d80533bf3205"
     }
    ],
    "body": {
     "size": 0
    },
    "parts": [
     {
      "partId": "0.0",
      "mimeType": "text/plain",
      "filename": "",
      "headers": [
       {
        "name": "Content-Type",
        "value": "text/plain; charset=UTF-8"
       }
      ],
      "body": {
       "size": 47,
       "data": "VGhpcyBpcyBhIHBsYWluL2h0bWwgKm1lc3NhZ2UqIHdpdGggYW4gaW1hZ2UuDQo="
      }
     },
     {
      "partId": "0.1",
      "mimeType": "text/html",
      "filename": "",
      "headers": [
       {
        "name": "Content-Type",
        "value": "text/html; charset=UTF-8"
       }
      ],
      "body": {
       "size": 73,
       "data": "PGRpdiBkaXI9Imx0ciI-VGhpcyBpcyBhIHBsYWluL2h0bWwgPGI-bWVzc2FnZTwvYj4gd2l0aCBhbiBpbWFnZS48L2Rpdj4NCg=="
      }
     }
    ]
   },
   {
    "partId": "1",
    "mimeType": "image/png",
    "filename": "smile.png",
    "headers": [
       ...
    ],
    "body": {
     "attachmentId": "ANGjdJ-OrSy7VAYL-UbRyNtmySbZLlV-fV43zJF0_neNGZ8yKugsZAxb32eSb-CrbYIhF9NvjGwBVEjSkRrUWoCS7aDpgoQnt9WR7f2sa17qVEyOg_JVSbrGrunirvQw2dY-SxxB3Y0JP3aYDHSBXpNO6fFCByVFWQDw1et5Mh9di7bGO4AWOLKFVe_Yb2RmdDwuazGXGb8zA88TTMaiEPIacPTNiVtBrIWG0EKGxHBhep9j8ujyWeCS5P9X80dBHvBNj4T9XjUwcrN6FvwegRewRMM9cBupY7jQESR7915OcbhCNyi5l64x6vVh1ZU",
     "size": 2002
    }
   }
  ]
 },
 "sizeEstimate": 3077
}

您将看到它只是解析为JSON的RFC822消息.如果仅遍历parts，并将payload视为part本身，则会找到所需的内容.

You will see it's just the RFC822-message parsed to JSON. If you just traverse the parts, and treat the payload as a part itself, you will find what you are looking for.

var parts = [response.payload];

while (parts.length) {
  var part = parts.shift();
  if (part.parts) {
    parts = parts.concat(part.parts);
  }

  if(part.mimeType === 'text/html') {
    var decodedPart = decodeURIComponent(escape(atob(part.body.data.replace(/\-/g, '+').replace(/\_/g, '/'))));
    console.log(decodedPart);
  }
}

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