Google Apps Script redirect uri error - google-apps-script

Question

I'm trying to make a standalone Google Apps Script to access an API through the OAuth2 library, found here: https://github.com/googlesamples/apps-script-oauth2
I have not been able to get any of the examples to work so far, but I think it's because I cannot register my application and set the OAuth redirect URI. This is my first attempt at using OAuth.
Here are the steps I've taken:
Create a new standalone Google App Script
Paste in the contents of Dropbox.gs (for this example)
Add the OAuth2 library to my script
(Resources > Libraries, and paste in the ID listed in the how-to)
Go to the console (Resources > Cloud Platform project) and navigate to
the APIs & Services > Credentials page
Grab the Client ID and Client secret from that page and paste them into my script.
Get the redirect URI from the script (by running logRedirectUri())
Paste the redirect URI into the cloud platform console, and hit save.
I get the error shown at this link (which reads "You do not have permission to perform this action.
Request URI error
From what I've studied, I need this URI entered in order to make this script work. Why won't this save?

Answer 1

Here are some things you can try.
Step one
The web app api
Change from using the appscript API to using a web app API. You can create a new one in the API admin console.
Then select the web app option.
Finally you will have a new API.
Open the new API and get the client ID and secrets.
Paste into the api the redirect from your app.
https://script.google.com/macros/d/{SCRIPT ID}/usercallback
Step two
The authentication and redirect
The next bit is tricky and may need some fiddling.
The first part of the code below generates a URL. The user then needs to be directed to open the generated URL in a new window. The new window will show all the usual google permissions including any scopes. When the user accepts they will be redirected back to your app.
function getAuthURL() {
var driveService = getDriveService();
if (!driveService.hasAccess()) {
var authorizationUrl = driveService.getAuthorizationUrl();
Logger.log(authorizationUrl)
}
function authCallback(request) {
var driveService = getDriveService();
var isAuthorized = driveService.handleCallback(request);
if (isAuthorized) {
return HtmlService.createHtmlOutput('Success! You can close this tab.');
} else {
return HtmlService.createHtmlOutput('Denied. You can close this tab');
}
}
Step three
The access token
Now the user gave permission it is possible to get the access token and pass it along on with fetch requests.
function makeRequest() {
var driveService = getDriveService();
var response = UrlFetchApp.fetch('https://www.googleapis.com/drive/v2/files?maxResults=10', {
headers: {
Authorization: 'Bearer ' + driveService.getAccessToken()
}
});
// ...
}