LinkedIn OAuth 2.0 Redirect URL

Question

I'm attempting to sign in users with the LinkedIn Omniauth 2 gem. I have tried a few different possibilities for the redirect, read several articles and nothing is working.

I'm trying to test this locally. Rails 4 app

Gems include: omniauth omniauth-linkedin-oath2

A few attempts of the redirect URL to put in the box includ:

https://www.linkedin.com/uas/oauth2/authorization?client_id=759dczzx23nyic&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fauth%2Flinkedin%2Fcallback&response_type=code&scope=r_basicprofile+r_emailaddress&state=8da572e31a8e66e6b1de54acddd14937d976ed06d7ed3217&client_id=*

• = API Key that needs to stay private

  http://localhost:3000
  
  http://localhost:3000/
  
  http://www.localhost:3000
  
  https://localhost:3000
  
  https://localhost:3000/
  
  https://www.localhost:3000
  

I read both of these articles the entire way through, but still couldn't attempt to find the correct way to redirect it.

https://developer.linkedin.com/forum/register-your-oauth-2-redirect-urls

https://developer.linkedin.com/forum/oauth-20-redirect-url-faq-invalid-redirecturi-error

Any help in what I need to change would be great.

Equip

Answer 1

They need to match exactly what you are sending:

http://localhost:3000/auth/linkedin/callback

Towers

Hey there is quick question, @Eugenio Pace Can a public IP address be used as LinkedIn OAuth redirect URI? – Disgruntle

Very likely (and easy to test). An important aspect of any OAuth2 Authorization Server is that all communications are initiated either from: (1) The user's browser, (2) Your app (the "client" in OAuth2 terminology) So it doesn't really matter if you use your own /etc/hosts file with an IP address. As long as your browser or the code running your app can reach LinkedIN (in the example), you will be fine. LinkedIN never connects with your app. – Towers

Answer 2

In case of Linkedin Authorized Redirect URLs should be in form of:

1. http://localhost:8080/your-project-name/auth/linkedin

After authentication if you want to redirect to a specific page then

2. http://localhost:8080/your-project-name/that-page-url

Kasten

Answer 3

I was having a similar issue and kept getting "Invalid redirect_uri. This value must match a URL registered with the API Key." error when using Auth0

I added URL below to LinkedIn's list of allowed callback then it worked.

https://"Insert your Client Domain Name from Auth0"/login/callback

Nosewheel