--- title: Login with Auth0 and Rails slug: login-with-auth0-and-rails published_at: 2022-07-22 21:00:02 +0000 updated_at: 2026-03-04 20:13:27 +0000 summary: description: Code: https://github.com/cjavdev/auth0-demo #rails #rubyonrails tags: [cjav_dev, web development tutorials, web development for beginners, vim, ruby, rails, javascript, auth0, login, authorization, memberships, web development tutorial, authentication auth0, authentication tutorial, auth0 authentication] views: 2978 author: CJ Avilla url: https://www.cjav.dev/videos/login-with-auth0-and-rails youtube_url: https://www.youtube.com/watch?v=4OJpI7ZObQc youtube_id: 4OJpI7ZObQc embed_url: https://www.youtube.com/embed/4OJpI7ZObQc thumbnail_url: https://i.ytimg.com/vi/4OJpI7ZObQc/hqdefault.jpg type: video --- # Login with Auth0 and Rails *Published: July 22, 2022* *Views: 2978* ## Watch [Watch on YouTube](https://www.youtube.com/watch?v=4OJpI7ZObQc) [![Login with Auth0 and Rails](https://i.ytimg.com/vi/4OJpI7ZObQc/hqdefault.jpg)](https://www.youtube.com/watch?v=4OJpI7ZObQc) ## Description Code: https://github.com/cjavdev/auth0-demo #rails #rubyonrails ## Transcript what's up welcome back in this episode we're going to add off zero authentication to a rails application initially we're just going to use the bare bones basic just log in and log out with auth0 and then in the next episode we're going to add this sort of multi-tenant auth using the auth0 organizations and we'll show how to like do that maybe with custom domains a bunch of cool stuff so the first thing we want to do is when we come to our off zero application you log in make sure you have multi-factor auth setup the kind of app we're gonna build is a regular web application here we're just gonna call this rails simple demo and click on create this is gonna fire up a an application inside of auth0 and initially we can pick rails and this is a really awesome way to get started because it will drop you right in and show you the guide that you need to follow for ruby on rails but we'll kind of go through all the steps here so you don't need to take uh too deep of a look at that under the settings we're going to have a domain we're also going to have a client id and client secret so the very first thing we want to do is fire up a new rails app so we're going to say rails new and then we'll call this i don't know let's see um auth xero demo all right we'll cd into our new project here called auth0 something all right so i'm going to open up the rails credentials so i'm going to say editor is vi rails credentials colon edit and inside of here i'm going to drop in auth0 and i'm going to have my client id client secret and my domain these are going to be the three pieces of data that we need to store at least initially so we have our domain there we have our client id and our client secret so you can copy and paste these you don't need to copy mine or try to test it out i'm going to delete the app right after i build the demo so all right so now we've got some creds set up the next thing we want to do is scroll down underneath the application uris this this is where the end users will be redirected um or where the app is going to redirect as part of callback urls for the auth flow so the first one we want to do is add some allowed callback urls this is going to be http colon's localhost 3000 slash auth auth0 callback and we're also going to have some allowed logout urls this will just be returned to the root localhost 3000 slash so we're just going to allow it to drop back into the root we want to scroll all the way down to the very bottom and click on save changes all right now what we want to do is go back to our rails app and say bundle add we're going to add two gems omnioff off zero and also omnioth rails csrf protection these are the two gems that we're going to need in order to interact with auth0 um if you've watched any of the other omnioff tutorials that we've done it's very similar so we're going to open up a new config initializer called auth0 and in here we're going to set up our omni-auth provider so in this case the provider is going to be off 0. so we can say rails.application.config middleware use omniauthbuilder thank you copilot provider is zero that's pretty close to what we want so we'll start there and instead of uh so the yeah so the first argument is the name of the providers and the second argument is gonna be our client id which we're gonna get from rails to application credentials dot auth 0 client id and we're going to do the same thing for client secret and then domain and we have these two things the scope is going to be um actually inside of authorized params so we're going to have the scope inside of there and then our callback path is going to be where we should be redirected back to after we successfully complete the login all right the next step is we need some controller that is going to handle when we receive that callback so we're going to say railsg controller auth 0 and that's going to have a callback route and a failure route and it'll also have a log out route but we don't actually need a view for that or anything so we'll just say callback and failure and we probably need to do something uh authorize oh we're probably missing a comma all right yep forgot a comma here okay rails g controller off zero callback okay so let's open up our auth 0 controller so inside of this callback we're going to have access to request.n omnioth auth now this is going to contain all the data that comes back in the callback so we're going to say this is going to be our auth info and we'll store that in the session session user info is auth info and we'll actually get we're going to put in the uh the raw info which is going to come back underneath the extra key and then we'll redirect to some dashboard path which doesn't exist yet rails g controller dashboards and that's going to just have a show route dashboards i spelt it wrong so we'll go to our routes and inside of our routes we're going to want our route route to um home index or pages root which doesn't exist yet and then we'll have resource dashboard and then we're gonna have a couple of these auth routes that we need to add so we're gonna have a get route for auth off zero callback and that's going to go to off zero callback we're also going to get failure and the logout is going to go to that logout route so we'll just add another method here log out which doesn't exist yet but we'll get there okay so the the idea is that you won't be able to see the dashboard until you're authenticated we need another controller here rails g controller pages that's going to have just the root view and that's that'll just kind of like be our landing page okay so we've got um our root route we have a dashboard that we're gonna hide unless you're logged in then we've got a couple of different auth routes the next step is we want to actually add a way for a user to click on a button that will bring them through the authentication flow but i guess before we get too far we'll migrate the database and then let's fire this up and just look at what it looks like so bin dev and we're going to take a look here so local host 3000 okay so this is our pages controller the root route for our pages controller so let's open that up pages root and we're going to add just a couple of buttons here so we're going to say button to login and that's going to take us to auth auth0 and we want this to be method uh we want this to send a post request and we also want to disable turbo so we're going to say data turbo is false and i believe this should bring us to the off flow so now we have a button here it's tailwind so it's like whatever you can't actually see it doesn't look very buttony but whatever all right so we'll click on login now we're redirected to the login page and now we can either sign up with email and password or with google now if we go back to the application um details in the uh in the dashboard here under connections this is where you can specify like all the different things that you can use uh for connection so you could set up if you wanted to you could set up like a log in with other social providers or whatever there are a ton so you could say you want to create a new kind of connection so if you want to log in with facebook or along with github or whatever you can do so so right now i just have username and password and i have google auth setup so if we say maybe sign up with a username and password wave at cjav.dev password and click continue um oh sorry we need to sign up so wave cjob.dev password and it apparently is going to verify um that we actually have a good password all right so let's see we are logged in okay we're gonna accept and we do want to authorize access all right so now we're logged in um i believe so the i don't know it's possible we're locked we got redirected the dashboard page so if we go over to the dashboards controller um right now we're not actually preventing access to this page what we could do is say render json of session user info and refresh this page okay so now we're getting back like the raw data from um from the session that's stored when someone logs in but the next thing we want to do is just like make sure that people can only access this page if they are actually authenticated so one way we might do that is by adding a um a method to the application controller called like i don't know um authenticate user this is the same name that devise uses and we could say something like redirect to slash unless there's a session with user info um so this would this could be our sort of before filter now we could say before action um authenticate user right and so now if we came to this page and we refresh we needed an exclamation point here okay so we apparently are able to get into this route if we open up the um the dev tools by right-clicking and going to inspect let's zoom in here a little bit and go to the application tab under the cookies section here we could um delete or clear all of our cookies and that should log us out we're no longer logged in because that the cookie is where we were storing our session so if we click log in again we are logged in and we're brought back to this page and um so yeah now we're like we're fully logged in let's add a button so that we can actually log out also okay so in order to log out we're going to go back to our auth0 controller and add some um some log out context here so in order to log out what we want to do is we're actually going to redirect to a special url that's underneath our auth0 domain and that's going to cause us to log out so this is really going to be something like reset session or like session user info is nil and then instead of just redirecting to slash what we want what we want to do is actually go to a logout route that is part of part of auth00 so we need to construct a url so we're going to say something like let's use the uri builder and the host is going to be rails.application.credentials.off0 domain and that is the right logout and then the query string is going to be something like return we want to pass in a return to and we also want to pass in our client id so that is our client id rails application credentials auth 0 client id okay so this is the url that we're going to redirect to url now we're going to say redirect to url and we need to allow other hosts because this is going to redirect to a page on on auth0 let's also just clean this up a little bit this is kind of nasty okay there we go all right much cleaner all right we could probably extract the query into some other thing too but and then we also want to say status is c other all right that apparently does something fun with turbo okay so now what we can do is we can go back to our root html erb and add another button here that's going to be like log out and this is going to be something that just brings us to i think uh log out or off zero logout let's look at our routes so auth slash logout so auth logout yeah this doesn't need to be a post request in fact this could be just like a link to um thing yeah all right so we're going to refresh the page click on logout and all right so now are we logged out can we go to the dashboard okay we cannot go to the dashboard so we're like totally logged out um if we click on login again we're brought through this process wave at cgive.dev and then uh enter our password all right we're logged back in okay so that is kind of the entire auth flow um the one other thing that i wanted to do is in the examples for um the rails examples for auth0 i really liked one of the tools that they used and that was to move this authentication thing from being a before action that sort of might clutter up your application controller into a concern so let's add a new concern called secured and this is going to be rb and this will be something where we say module module secured and we want to extend active support concern and then by doing so it gives us this included do thing which we can add like before action authenticate user bang and now we can just copy our application controller method here into our secured concern and then on our dashboards controller we can actually just say include secured um so i don't know the the downside of this is you can't control specific actions that are um that are included i'm sorry yeah specific like controller actions but you can just easily add secured and it doesn't clutter everything up so um i don't know this is kind of nice all right so let's wrap it up there that is how you set up auth0 in a rails application to add login and logout functionality in a future episode we're going to add some organization so we can do multi-tenant auth with auth0 so stay tuned for that next episode [Music] --- [Back to all videos](https://www.cjav.dev/videos) --- ## Hey 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