Add OAuth2 provider capability using doorkeeper gem (#24808).

Patch by Jens Krämer (user:jkraemer).

git-svn-id: https://svn.redmine.org/redmine/trunk@23837 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/application_controller.rb

@@ -131,6 +131,14 @@ class ApplicationController < ActionController::Base
       if (key = api_key_from_request)
         # Use API key
         user = User.find_by_api_key(key)
+      elsif access_token = Doorkeeper.authenticate(request)
+        # Oauth
+        if access_token.accessible?
+          user = User.active.find_by_id(access_token.resource_owner_id)
+          user.oauth_scope = access_token.scopes.all.map(&:to_sym)
+        else
+          doorkeeper_render_error
+        end
       elsif /\ABasic /i.match?(request.authorization.to_s)
         # HTTP Basic, either username/password or API key/random
         authenticate_with_http_basic do |username, password|