Different response on similar requests Gmail API

Question

I'm trying to handle the response object from Gmail API with getting attachments from certain messages:

In my Gmail account i have 2 Labels: Label_1 Label_2

both messages get daily reports from different web services and im using the Gmail API to first get a list of messages while im filtering a message with a Label and a query search string (q field) which contains a certain date (this is how i get only one message when i request a list)

with the response object Im able to get the message ID and then send another request with the message ID.

I want to download the attachments so in the response object im searching for the Payload.Parts field of the response object

In Label_1 response - Payload.Parts[0] contains the filename field and Payload.Parts[0].Body contains the attachmentID

In Label_2 response - Payload.Parts[1].Parts[0] contains the filename and same for .Body contains the attachmentID.

my question is: why this is happening? why in one response i get the wanted fields in the first Payload.Parts and in the second i have to go deeper in the object's fields?

I've also noticed that in Label_1 response I receive an HTTP header which I dont get on the second one that I think may be related: DKIM-Signature

any thoughts?

Thanks.

Tholle Tholle · Accepted Answer · 2016-08-15T17:37:56

The response you get is just the RFC822-message parsed to JSON. The message might be multipart/mixed, multipart/related, text/html or something similar. It is best to write your code so you check all parts in the payload:

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
    }
   }
  ]
 }
};

// In e.g. a plain text message, the payload is the only part.
var parts = [response.payload];
var attachmentIds = [];

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

  if(part.body && part.body.attachmentId) {
    attachmentIds.push(part.body.attachmentId);
  }
}

console.log(attachmentIds);

Different response on similar requests Gmail API

1 Answers