How to request access token for Reddit on Google Apps Script

Question

I have been trying to figure out how to acquire an access token from Reddit API in Google Apps Script. I have below code written so far:

function main() {
  
  var username = 'myredditusername';
  var pwd = 'myredditpassword';
  var client_id = 'myredditclientid';
  var client_secret = 'myredditclientsecret';

  var access_token_url = 'https://www.reddit.com/api/v1/access_token';
  var api_url = 'https://oauth.reddit.com/';
  var user_agent = 'MySideProjectUserAgent';

var data = {
  'grant_type': 'password',
  'username': username,
  'password': pwd
};

var options = {
  'method' : 'post',
  'contentType': 'application/json',
  'payload' : JSON.stringify(data),
  'headers': {'User-Agent': user_agent},
  // what do I enter here to pass my client_id and client_secret?    
};

var resp = UrlFetchApp.fetch(access_token_url, options);
console.log(resp.getContentText());
}

Running the above code receives an error like below (not surprising because I still need to figure out how to pass in my client_id and client_secret):

Exception: Request failed for https://www.reddit.com returned code 401. Truncated server response: {"message": "Unauthorized", "error": 401} (use muteHttpExceptions option to examine full response)

When using curl, I was able to acquire the token successfully with this command:

curl -X POST -A 'KeywordTrackAgent' -d "grant_type=password&username=myredditusername&password=myredditpassword" --user 'client_id:client_secret' https://www.reddit.com/api/v1/access_token

From reaching around (example post), I figured that if I were to translate this curl request to a POST request, I'd need to add Authorization field to my headers parameter with the format like below:

function main() {
  
  var username = 'myredditusername';
  var pwd = 'myredditpassword';
  var client_id = 'myredditclientid';
  var client_secret = 'myredditclientsecret';

  var access_token_url = 'https://www.reddit.com/api/v1/access_token';
  var api_url = 'https://oauth.reddit.com/';
  var user_agent = 'MySideProjectUserAgent';

var data = {
  'grant_type': 'password',
  'username': username,
  'password': pwd
};

var options = {
  'method' : 'post',
  'contentType': 'application/json',
  'payload' : JSON.stringify(data),
  'headers': {
    'User-Agent': user_agent,
    // Below, I decided to encode my client_id and client_secret in base64 with the prefix 'Basic '
    'Authorization': 'Basic clientIdAndClientSecretInBase64',
    },
};

var resp = UrlFetchApp.fetch(access_token_url, options);
console.log(JSON.parse(resp.getContentText()));
}

I'm still receiving { error: 'unsupported_grant_type' }.

Could anyone--who has successfully fetched Reddit access token using JavaScript and preferably, using Google Apps Script--share some suggestion/insight on this? Thank you in advance for your answers!

Answer 1

I believe your goal as follows.

• You want to convert the following curl command to Google Apps Script.

    curl -X POST -A 'KeywordTrackAgent' -d "grant_type=password&username=myredditusername&password=myredditpassword" --user 'client_id:client_secret' https://www.reddit.com/api/v1/access_token
  

This curl command sends the data as the form data. And, the basic authorization is used. When these are reflected to the Google Apps Script, it becomes as follows.

Sample script:

In this script, your values are used.

function main() {
  var username = 'myredditusername';
  var pwd = 'myredditpassword';
  var client_id = 'myredditclientid';
  var client_secret = 'myredditclientsecret';
  var access_token_url = 'https://www.reddit.com/api/v1/access_token';

  var data = {
    'grant_type': 'password',
    'username': username,
    'password': pwd
  };
  var options = {
    'method': 'post',
    'payload': data,
    'headers': {
      'Authorization': 'Basic ' + Utilities.base64Encode(`${client_id}:${client_secret}`),
    },
  };
  var resp = UrlFetchApp.fetch(access_token_url, options);
  console.log(JSON.parse(resp.getContentText()));
}

• At this script, the request is same with the curl command.

Note:

• In this script, it supposes that the values for authorizating are correct. Please be careful this.

Reference:

• fetch(url, params)