How do I convert this mailgun multi attachment cURL request to UrlFetchApp?

user_250422 0
Viewed 282

I want to use Google Application Script to send email via mailgun with multiple attachments.

  var params = {
    "from": email.fromName+" <"+email.fromEmail+">",
    "to": email.toEmail,
    "subject": email.subject,
    "replyto": email.fromEmail,    
    "text": email.message,
    "html": email.htmlMessage,
  };

this works perfectly for one attachment.

params.attachment = DriveApp.getFileById("Google drive file ID").getBlob()

The official mailgun documentation states that "You can post multiple attachment values. Important: You must use multipart/form-data encoding when sending attachments."

How to do that using cURL is

curl -s --user 'api:YOUR_API_KEY' \
    https://api.mailgun.net/v3/YOUR_DOMAIN_NAME/messages \
    -F from='Excited User <YOU@YOUR_DOMAIN_NAME>' \
    -F to='foo@example.com' \
    -F cc='bar@example.com' \
    -F bcc='baz@example.com' \
    -F subject='Hello' \
    -F text='Testing some Mailgun awesomness!' \
    --form-string html='<html>HTML version of the body</html>' \
    -F attachment=@files/cartman.jpg \
    -F attachment=@files/cartman.png

I cannot add two keys attachment to object params that is used in UrlFetchApp. Below is code that I tried to make multiple attachemnet work. I got inspired here with encodeURIComponent()

 email.attachments = {}
 email.attachments.file1 = "1Xq63awYnOfSeL7fStkn0jWsou"
 email.attachments.file2 = "1Iy96o9Tw9tvMw7VgZMzCA9mqm"


 if ("file1" in email.attachments){
   var attachment = []
   for (const fileTMP in email.attachments){
     const fileId =  email.attachments[fileTMP]
     const file = DriveApp.getFileById(fileId);

     var attachmentBlob = file.getBlob()

     attachment.push(attachmentBlob)
 //   attachment.push(encodeURIComponent(attachmentBlob))
   }
 //  params.attachment = attachment.join(",")  // doesnt work, even for 1 file
 //  params.attachment = attachment // doesnt work, even for 1 file
   params.attachment = attachment.join("&")  // doesnt work, even for 1 file, even with encodeURIComponent()
 }

Could some one help me to send multiple attachments from mailgun via Google Application Script. Can I use custom name for the attachment?

UPDATE

Reply to my enquiry from mailgun support

We don't have direct development support or are able to review
or debug any code in the level of capacity you are seeking so we
would not be able to help here. I suggest you look for online 
resources and look for community-made code libraries that might 
make what you are trying to accomplish easier, especially since 
the langue you are using is one we are not familiar with or in 
our documentation.
mailgun google-apps-script http-post curl
1 Answers

Thanks to @Kos and his first comment I got inspiration from MailGun API Python Requests so I can post working code how to send multiple attachments using GAS and mailgun.

function sendEmail(email) {
      
  var params = {
    "from": email.fromName+" <"+email.fromEmail+">",
    "to": email.toEmail,
    "subject": email.subject,
    "replyto": email.fromEmail,    
    "text": email.message,
    "html": email.htmlMessage,
  }    
  if ("attachments" in email){
      for(var i=0, len=email.attachments.length; i < len; i++){
        const fileId =  email.attachments[i]
        const file = DriveApp.getFileById(fileId);
  
        var attachmentBlob = file.getBlob()
        params["attachment["+i+"]"] = attachmentBlob
      }
  }

  if ( "bcc" in email){
    params.bcc = email.bcc
  }

  var options = {
    'method': 'post',
    'payload': params,
    'headers': {
      'Authorization': 'Basic ' + Utilities.base64Encode("api:" + MAILGUN_KEY)
    }
  }

  var response = JSON.parse(UrlFetchApp.fetch(email.url, options))
}

where the email data object could look like

  var email ={}
  email.toEmail = "TOemail@email.cz"
  email.fromEmail = "fromEmail@email.cz"
  email.fromName = "From email name"
  email.subject = "From email name"
  email.message = textVersionOfEmail
  email.htmlMessage = hTMLVersionOfEmail

  email.attachments = []
  email.attachments.push(file1ID)
  email.attachments.push(file2ID)

If you know how to be able to name files in the script please leave a note.

user_2504220
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