使用 Gmail API 获取邮件正文

Posted 2023-03-25

【中文标题】使用 Gmail API 获取邮件正文

【英文标题】：Grabbing message body with Gmail API

【发布时间】：2016-12-12 19:17:30

【问题描述】：

每当我通过 API 资源管理器 (https://developers.google.com/apis-explorer/#p/gmail/v1/gmail.users.messages.get?) 发出测试请求时，我都会在 JSON 输出中得到一个包含大量正文标签的有效负载。我需要获取代表消息正文文本的正文标记，仅此而已。在每个响应中，我怎么知道是哪个 body 标签？

【参考方案1】：

您可以在payload 中的零件的mimeType 中查看类型为text/html 或text/plain 的零件：

var response = 
 "payload": 
  "parts": [
   
    "mimeType": "multipart/alternative",
    "filename": "",
    "headers": [
     
      "name": "Content-Type",
      "value": "multipart/alternative; boundary=001a1142e23c551e8e05200b4be0"
     
    ],
    "body": 
     "size": 0
    ,
    "parts": [
     
      "partId": "0.0",
      "mimeType": "text/plain",
      "filename": "",
      "headers": [
       
        "name": "Content-Type",
        "value": "text/plain; charset=UTF-8"
       
      ],
      "body": 
       "size": 9,
       "data": "V293IG1hbg0K"
      
     ,
     
      "partId": "0.1",
      "mimeType": "text/html",
      "filename": "",
      "headers": [
       
        "name": "Content-Type",
        "value": "text/html; charset=UTF-8"
       
      ],
      "body": 
       "size": 30,
       "data": "PGRpdiBkaXI9Imx0ciI-V293IG1hbjwvZGl2Pg0K"
      
     
    ]
   ,
   
    "partId": "1",
    "mimeType": "image/jpeg",
    "filename": "feelthebern.jpg",
    "headers": [
     
      "name": "Content-Type",
      "value": "image/jpeg; name=\"feelthebern.jpg\""
     ,
     
      "name": "Content-Disposition",
      "value": "attachment; filename=\"feelthebern.jpg\""
     ,
     
      "name": "Content-Transfer-Encoding",
      "value": "base64"
     ,
     
      "name": "X-Attachment-Id",
      "value": "f_ieq3ev0i0"
     
    ],
    "body": 
     "attachmentId": "ANGjdJ_2xG3WOiLh6MbUdYy4vo2VhV2kOso5AyuJW3333rbmk8BIE1GJHIOXkNIVGiphp3fGe7iuIl_MGzXBGNGvNslwlz8hOkvJZg2DaasVZsdVFT_5JGvJOLefgaSL4hqKJgtzOZG9K1XSMrRQAtz2V0NX7puPdXDU4gvalSuMRGwBhr_oDSfx2xljHEbGG6I4VLeLZfrzGGKW7BF-GO_FUxzJR8SizRYqIhgZNA6PfRGyOhf1s7bAPNW3M9KqWRgaK07WTOYl7DzW4hpNBPA4jrl7tgsssExHpfviFL7yL52lxsmbsiLe81Z5UoM",
     "size": 100446
    
   
  ]
 
;

function decode(string) 
  return decodeURIComponent(escape(atob(string.replace(/\-/g, '+').replace(/\_/g, '/'))));


function getText(response) 
  var result = '';
  // In e.g. a plain text message, the payload is the only part.
  var parts = [response.payload];

  while (parts.length) 
    var part = parts.shift();
    if (part.parts) 
      parts = parts.concat(part.parts);
    
    if (part.mimeType === 'text/plain') 
      // Continue to look for a 'text/html' part.
      result = decode(part.body.data);
     else if (part.mimeType === 'text/html') 
      // 'text/html' part found. No need to continue.
      result = decode(part.body.data);
      break;
    
  
  
  return result;



var text = getText(response);
console.log(text);

【参考方案2】：

他们都是。 MIME 多部分消息包含多个正文。如何将其转换为您认为的“标准”表示取决于。有时这些部分是替代品（即 HTML 与 txt），您可以选择一个。也可以是文件附件、签名等。

有关格式的详细信息，请参阅https://en.wikipedia.org/wiki/MIME#Multipart_messages。