Adding attachment to Gmail draft with Google Apps Script and Gmail API

Question

I try to automatically attach a file from my Google Drive (so ideally with the file id) in my Gmail draft created with Google Apps Script and GMail API. I use the syntax below. Can I do that easily? Creating the draft works great by the way.

Thanks! Chris

  function createDraft() {

  var forScope = GmailApp.getInboxUnreadCount(); // needed for auth scope

  var htmlBody = 'Howzit';

  var raw = 
      'Subject: Howzit\n' + 
      'To: [email protected]\n' +
      'Content-Type: text/html; charset=UTF-8\r\n' +
      '\r\n' + htmlBody;

  var draftBody = Utilities.base64Encode(raw, Utilities.Charset.UTF_8).replace(/\//g,'_').replace(/\+/g,'-');

  var params = {method:"post",
                contentType: "application/json",
                headers: {"Authorization": "Bearer " + ScriptApp.getOAuthToken()},
                muteHttpExceptions:true,
                payload:JSON.stringify({
                  "message": {
                    "raw": draftBody
                  }
                })
               };

  var resp = UrlFetchApp.fetch("https://www.googleapis.com/gmail/v1/users/me/drafts", params);

}

Tanaike · Accepted Answer · 2017-09-01 01:25:06Z

3

How about following sample script? This is a very simple script for attaching a file to a draft. So please modify this to your environment.

In order to use this script, please enable Gmail API at API console. And please import file ID to fileId in the script.

Sample script :

function createDraft() {
  var fileId = "### file id ###";
  var file = DriveApp.getFileById(fileId);
  var forScope = GmailApp.getInboxUnreadCount();
  var htmlBody = 'Howzit';
  var raw = 
      'Subject: Howzit\r\n' + 
      'To: [email protected]\r\n' +
      'Content-Type: multipart/mixed; boundary=##########\r\n\r\n' +
      '--##########\r\n' +
      'Content-Type: text/html; charset=UTF-8\r\n\r\n' + htmlBody + '\r\n' +
      '--##########\r\n' +
      'Content-Type: ' + file.getMimeType() + '; charset=UTF-8; name="' + file.getName() + '"\r\n' +
      'Content-Disposition: attachment; filename="' + file.getName() + '"\r\n' +
      'Content-Transfer-Encoding: base64\r\n\r\n' + Utilities.base64Encode(file.getBlob().getBytes()) +
      '\r\n--##########\r\n';
  var draftBody = Utilities.base64EncodeWebSafe(raw, Utilities.Charset.UTF_8);
  var params = {
    method:"post",
    contentType: "application/json",
    headers: {"Authorization": "Bearer " + ScriptApp.getOAuthToken()},
    muteHttpExceptions: true,
    payload: JSON.stringify({"message": {"raw": draftBody}})
  };
  var resp = UrlFetchApp.fetch("https://www.googleapis.com/gmail/v1/users/me/drafts", params);
  Logger.log(resp)
}

Result :

{
  "id": "#####",
  "message": {
    "id": "#####",
    "threadId": "#####",
    "labelIds": [
      "DRAFT"
    ]
  }
}

Image :

answered Sep 1, 2017 at 1:25

Tanaike

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8 Comments

Chris Rutte Over a year ago

Thanks a lot, works as a beast, wasn't able to find it anywhere. Thanks!

Tanaike Over a year ago

@Chris Rutte Welcome. Thank you, too.

Chris Rutte Over a year ago

Quick extra question, what if I want to add two files to the e-mail? Thanks in advance!

Tanaike Over a year ago

@Chris Rutte Please loop the part which attaches a file by separating using '--##########\r\n'.

Chris Rutte Over a year ago

Thanks, will try it this afternoon or tonight!

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