Sign In With Slack | nil request.env['omniauth.auth']

[kwent]

Hi thank you for this library super helpful!

So i'm trying to setup sign in with slack per their doc: https://api.slack.com/authentication/sign-in-with-slack

  Rails.application.config.middleware.use OmniAuth::Strategies::OpenIDConnect, {
    name: :sign_in_slack,
    issuer: 'https://slack.com',
    discovery: true,
    scope: [:openid, :email, :profile],
    response_type: :code,
    client_options: {
      port: 443,
      scheme: "https",
      host: "slack.com",
      identifier: "redacted",
      secret: "redacted",
      redirect_uri: "#{ENV['BASE_URL']}/auth/slack/callback/sign_in",
    },
  }

But my callback controller is seeing request.env['omniauth.auth'] nil.

The callback_phase method is never called.

What am i doing wrong ?

Regards

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[kwent]

Not stale. Still waiting for an answer :)

[formigarafa]

I am not sure but, try removing the redirect_uri param and let the gem generate one automatically . maybe the endpoint that should trigger the callback_phase is not being called because of that.

[formigarafa]

@kwent did this resolve your problem?

[kwent]

Don't have capacity to try this again right now but i'll let you know when i do

[danjay]

Your redirect uri needs to be /auth/name_of_provider/callback

So #{ENV['BASE_URL']}/auth/sign_in_slack/callback

[kwent]

Is this a requirement ? We have this in our routes.rb so shouldn't matter

get "/auth/slack/callback/sign_in" => "omniauth_callbacks#sign_in_slack"

[dgmstuart]

I had the same issue and apparently it is a requirement:

When I had my redirect URL set to just /auth/slack/callback, I also got request.env['omniauth.auth'] nil. But changing it to /auth/slack/callback (where name: :slack in the OmniAuth::Builder config) I get a CSRF error from the callback phase (which is at least progress).

[dgmstuart]

(Ok for reference, my CSRF issue was dumb: I have ngrok pointing at localhost:3000, but I was starting the authorization from localhost:3000, so the "omniauth.state" cookie (which is used for CSRF protection) was set on localhost and so wasn't available in the callback phase, since that used the ngrok url)

[dgmstuart]

I am not sure but, try removing the redirect_uri param and let the gem generate one automatically

This didn't work for me: this gem doesn't seem to try to construct a redirect_uri? I had a look at the dependent gems as well and they don't seem to either.

Here's the result from Slack of passing it as nil:

[indirect]

I eventually got this working by overwriting the redirect_url method to match what Slack wanted: https://github.com/sunchaserio/omniauth-sign-in-with-slack/blob/main/lib/omniauth/strategies/slack.rb