Add a redirect_uri function so that the redirect_uri is configurable

[ueberauth]

Add a redirect_uri function so that the redirect_uri is configurable

[doomspork]

@aef- PRs are welcome for new functionality 👍

[nicooga]

I don't know wheter this is related, but I'm also working with a single page application and an elixir API.
I'm using https://github.com/sahat/satellizer to fire the popups on the single page, then POSTing with code to the API. The result is an ueberauth error redirect_uri_mismatch.

pry(6)> params
%{"clientId" => "...",
  "code" => "4/vLOSfRQi-OK6B...",
  "provider" => "google", "redirectUri" => "http://localhost:3333",
  "state" => "....."}
pry(7)> fails
%Ueberauth.Failure{errors: [%Ueberauth.Failure.Error{message: nil,
   message_key: "redirect_uri_mismatch"}], provider: :google,
 strategy: Ueberauth.Strategy.Google}

I'm not sure how to continue, I'm pretty sure I've configured well the allowed redirect uris on google console.

[nicooga]

Indeed, made a fork to implement this functionality and that worked for me.

config :ueberauth, Ueberauth,
  providers: [
    google: {Ueberauth.Strategy.Google, [
      callback_methods: ["POST"],
      callback_path: "/api/auth/google/callback",
      callback_url: "http://localhost:3333" # Where my Brunch app is running
    ]}
  ]

Making a PR ASAP.

[doomspork]

This has been merged into master. I'll release a new version later this evening, ideally with #28 included.