Summary:
I have a CORS problem. I'm trying to authenticate with Facebook from a React app with a Rails API.
My app runs on localhost:8080 and my api runs on Heroku.
I'm able to login to facebook and create a session on callback, but the cookie set by facebook isn't picked up by omniauth. I use omniauth-facebook client-side authentication.
I think that the problem is somewhere in my configuration of rack-cors. It works when I run my api on localhost:3000.
Earlier, I received the error csrf-detected, but this was resolved by adding
provider_ignores_state: true to omniauth configuration. Later, I found that xhrFields: { withCredentials: true } was required for cors calls to pass cookies.
Finale solution: At the end, I resolve this issue by deploying my app to AWS 53 with domain example.com and create CNAMES 'api.example.com` to my api on Heroku.
It takes a day to get CNAMES resolved. You can test your setup in terminal with commands host example.com and host api.example.com.
Alternative solution is to use nginx as proxy.
Versions:
Rails 4.2.2
Omniauth-facebook 3.0.0
Omniauth-oauth2 1.4.0
Rack-cors 0.4.0
Issue:
Getting error: no_authorization_code.
Routes:
namespace :api do
match "/auth/:provider/callback", to: "sessions#create", via: [:get, :post]
get "/auth/failure", to: "sessions#failure"
get "/logout", to: "sessions#destroy"
Application.rb:
config.middleware.insert_before 0, "Rack::Cors" do
allow do
origins "localhost:8000", "example.com"
resource "*",
:headers => :any,
:methods => [:get, :post, :delete, :put, :options],
:max_age => 1728000
end
end
Omniauth.rb:
OmniAuth.config.path_prefix = "/api/auth"
OmniAuth.config.logger = Rails.logger
OmniAuth.config.on_failure = Proc.new { |env|
OmniAuth::FailureEndpoint.new(env).redirect_to_failure
}
Rails.application.config.middleware.use OmniAuth::Builder do
provider :facebook,
Rails.application.secrets.facebook_key,
Rails.application.secrets.facebook_secret, {
provider_ignores_state: true,
client_options: {
:ssl => { :ca_file => "/usr/lib/ssl/certs/ca-certificates.crt" }
}
}
provider :identity,
fields: [:email],
on_failed_registration: lambda { |env|
Api::IdentitiesController.action(:new).call(env)
}
end
Secret.yml:
development:
facebook_key: <%= ENV["FACEBOOK_KEY"] %>
facebook_secret: <%= ENV["FACEBOOK_SECRET"] %>
Client:
$.ajax({
url: http://localhost:3000/api/auth/facebook,
dataType: "json",
type: "GET",
xhrFields: { withCredentials: true },
success: function(data) {
}.bind(this),
error: function(xhr, status, err) {
}.bind(this)
})
SessionsController:
module Api
class SessionsController < ApplicationController
skip_before_action :verify_authenticity_token
skip_before_action :restrict_access
skip_after_action :verify_authorized
def create
user = User.from_omniauth(auth_params)
session[:user_id] = user.id
render json: user, status: :ok
end
def destroy
session[:user_id] = nil
render json: {}, status: :ok
end
def failure
render json: { errors: params[:message] }, status: :unauthorized
end
private
def auth_params
request.env.fetch("omniauth.auth")
end end end
ApplicationsController:
class ApplicationController < ActionController::Base
include Pundit
before_action :restrict_access
after_action :verify_authorized, :except => :index
after_action :verify_policy_scoped, :only => :index
respond_to :json
protected
attr_reader :current_user
# Allows access to current_user in serializators.
serialization_scope :current_user
def restrict_access
authenticate_or_request_with_http_token do |token, options|
@current_user = User.find_by(token: token)
end
end
end
