Using Axios to post to Mailgun within an Atlas function

[Campbell_Affleck]

I’ve been struggling a bit to implement a custom email/password auth function in Atlas. I’ve tried functions using mailgun.js, mailgun-js, and axios to post a request to Mailgun, but while they’re easy to get running in my local environment I keep getting errors in Atlas. I believe this is because Atlas’s version of Node.js is very out of date, which means a lot of dependencies need to be loaded with long out-of-date versions to run.

Currently this is the function I’m running:

exports = ({ token, tokenId, username }) => {
  const API_KEY = 'my mailgun API key';
  const DOMAIN = 'my mailgun domain';
  
  const axios = require('axios').default;
  axios({
      method: 'post',
      url: DOMAIN,
      auth: {
          username: 'api',
          password: API_KEY
      },
      params: {
          from: "Test <support@domain>",
          to: username,
          subject: "Email Confirmation",
          template: "email_confirmation",
          'h:X-Mailgun-Variables': JSON.stringify({userToken: token, userTokenId: tokenId})
      }
  }).then(
      response => {
          console.log(response)
      },
      reject => {
          console.log(reject)
      }
  )

  return { status: 'pending' };
};

And the error I’m seeing:

> ran at 1681606325251
> took 359.796052ms
> logs: 
TypeError: Invalid scheme
> result: 
{
  "status": "pending"
}
> result (JavaScript): 
EJSON.parse('{"status":"pending"}')

What is TypeError: Invalid scheme referencing? Since this same code runs on my local environment perfectly I’m not sure what it could be. I’ve also uploaded my node_modules dependencies so that I’m using the same dependencies in Atlas.

[Campbell_Affleck]

I’ve also tried it using context.http.post() with the following code in the export function, if that might be a better way to go about it:

  const API_KEY = 'my_mailgun _API_key';
  const DOMAIN = 'my_mailgun_domain';
  context.http.post({
      url: "https://api:my_mailgun _API_key@www.my_mailgun_domain",
      headers: {
        "Content-Type": [ "multipart/form-data" ]
      },
      form: {
          'from': "support@domain",
          'to': username,
          'subject': "Email Confirmation",
          'template': "email_confirmation",
          'h:X-Mailgun-Variables': JSON.stringify({userToken: token, userTokenId: tokenId})
      },
      encodeBodyAsJSON: false
    })
    .then(response => {
      // The response body is encoded as raw BSON.Binary. Parse it to JSON.
      const ejson_body = EJSON.parse(response.body.text());
      return ejson_body;
    })
    .catch( error =>  console.log(error) );

And I’m seeing the following error:

> ran at 1681612573424
> took 315.297896ms
> logs: 
FunctionError: TypeError: invalid character '<' looking for beginning of value
> result: 
{
  "status": "pending"
}
> result (JavaScript): 
EJSON.parse('{"status":"pending"}')

I’ve tried to find documentation on these errors but I haven’t been able to find anything. Am I missing something here?

[Kushagra_Kesav]

Hello @Campbell_Affleck,

Welcome to the MongoDB Community forums

I tested the following code:

exports = ({ token, tokenId })=>{
    "use strict";
    const API_KEY = API_KEY;
    const Domain = `https://api.mailgun.net/v3/${DOMAIN_NAME}/messages`;
    const axios = require('axios').default;
    axios({
        method: 'post',
        url: Domain,
        auth: {
            username: 'api',
            password: API_KEY
        },
        params: {
            from: "Mailgun Sandbox <postmaster@Sandbox.mailgun.org>",
            to: "example@example.com",
            subject: "Email Confirmation",
            template: "testing",
            'h:X-Mailgun-Variables': JSON.stringify({userToken: token, userTokenId: tokenId})
        }
    }).then(
        response => {
            console.log(response);
            console.log('Success');

        },
        reject => {
            console.log(reject);
            console.log('Failed');
        }
    );
    return JSON.stringify({ Status: "Pending" });
};

and it worked fine for me, returning the output as follows:

> ran at 1682956544266
> took 1.095613339s
> logs:
[object Object]
Success
> result: 
"{\"Status\":\"Pending\"}"
> result (JavaScript): 
EJSON.parse('"{\"Status\":\"Pending\"}"')

I also received the email at my recipient email.

@Campbell_Affleck

TypeError: Invalid scheme

It appears that the error is occurring from the reject block. Can you ensure that you have provided all the correct credentials?

Best,
Kushagra

[Campbell_Affleck]

Hey @Kushagra_Kesav, ahhhhh you’re absolutely right. The error was in the credentials not the code, what a silly error Thank you! I’ve fixed it up and it works perfectly. I’d seen some conflicting posts on the proper DOMAIN string structure, but it looks like https://api.mailgun.net/v3/${DOMAIN_NAME}/messages; is the proper way to go.