How does the body of the request look like when making a call to gmail api for sending an email with attachment (multipart)? - email

Question

Google documentation gave an example as below:
POST /upload/gmail/v1/users/userId/messages/send?uploadType=multipart HTTP/1.1
Host: www.googleapis.com
Authorization: Bearer your_auth_token
Content-Type: multipart/related; boundary=foo_bar_baz
Content-Length: number_of_bytes_in_entire_request_body
--foo_bar_baz
Content-Type: application/json; charset=UTF-8
{
"id": string,
"threadId": string,
"labelIds": [
string
],
"snippet": string,
"historyId": unsigned long,
"payload": {
"partId": string,
"mimeType": string,
"filename": string,
"headers": [
{
"name": string,
"value": string
}
],
"body": users.messages.attachments Resource,
"parts": [
(MessagePart)
]
},
"sizeEstimate": integer,
"raw": bytes
}
--foo_bar_baz
Content-Type: message/rfc822
Email Message data
--foo_bar_baz--
If the request succeeds, the server returns the HTTP 200 OK status code along with any metadata:
HTTP/1.1 200
Content-Type: application/json
{
"id": string,
"threadId": string,
"labelIds": [
string
],
"snippet": string,
"historyId": unsigned long,
"payload": {
"partId": string,
"mimeType": string,
"filename": string,
"headers": [
{
"name": string,
"value": string
}
],
"body": users.messages.attachments Resource,
"parts": [
(MessagePart)
]
},
"sizeEstimate": integer,
"raw": bytes
}
Can someone make a sample request body by looking at the above example?
I need to send an email with attachment.

Answer 1

Based from SO related post, the body request can be something like this:
var mail = [
'Content-Type: multipart/mixed; boundary="foo_bar_baz"\r\n',
'MIME-Version: 1.0\r\n',
'From: sender#gmail.com\r\n',
'To: receiver#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/png\r\n',
'MIME-Version: 1.0\r\n',
'Content-Transfer-Encoding: base64\r\n',
'Content-Disposition: attachment; filename="example.png"\r\n\r\n',
pngData, '\r\n\r\n',
'--foo_bar_baz--'
].join('');
var response = UrlFetchApp.fetch(
"https://www.googleapis.com/upload/gmail/v1/users/me/messages/send?uploadType=media", {
method: "POST",
headers: {
"Authorization": "Bearer " + ScriptApp.getOAuthToken(),
"Content-Type": "message/rfc822",
},
muteHttpExceptions: true,
payload: mail
});
Here's also an example code from digital inspiration written by Amit Agarwal in Google Appscript.
This example shows how you can easily send email messages with file attachment using Gmail API.