devise token auth + Save Facebook info - ruby-on-rails

Question

I am using Devise auth token gem and ng-token auth for authenticating my single page app. Besides registering with email there is the option to sign-up via Facebook. It works.
My problem is that as for my Fb request scope I set to get the user_friends, email and public_info, however when I get the request I don't see the auth_hash request.env['omniauth.auth']. This is described in the omniauth-facebook gem documentation.
Basically I want to save what FB gives back about the user in my database. How would you do it?

Answer 1

I use this end-point with Ionic2 app, for Facebook Login requests on Rails 5 API, using Koala and Devise Token Auth so you should be able to replicate on any Rails 5 app:
def facebook
#graph = Koala::Facebook::API.new(oauth_params[:token], ENV["FACEBOOK_SECRET"])
#profile = #graph.get_object("me?fields=email,first_name,last_name,picture.type(large)")
unless #user = User.where(email: #profile["email"])&.first
#user = User.new(email: #profile["email"])
end
#
# Here you will make your logic for saving Facebook's data on your User model,
# customize accordingly
#
if #user.new_record?
p = SecureRandom.urlsafe_base64(nil, false)
#user.password = p
#user.password_confirmation = p
#
# "Passwordless" login, user must set password after registering,
# or be forever haunted by indecipherable SecureRandom value
#
#user.name = #profile["first_name"]+ " " + #profile["last_name"]
#user.remote_avatar_url = #profile["picture"]["data"]["url"]
#user.confirmed_at = Time.now
#user.uid = #profile["id"]
#user.provider = 'Facebook'
end
#client_id = SecureRandom.urlsafe_base64(nil, false)
#token = SecureRandom.urlsafe_base64(nil, false)
#user.tokens[#client_id] = {
token: BCrypt::Password.create(#token),
expiry: (Time.now + DeviseTokenAuth.token_lifespan).to_i
}
auth_header = #user.build_auth_header(#token, #client_id)
# update the response header
response.headers.merge!(auth_header)
#user.save!
if sign_in(:user, #user, store: false, bypass: false)
render json: {
data: #user.token_validation_response
}
end
end
Point a POST route to this and pass authResponse.accessToken from Facebook request as params[:token].
Voilà, authentication magic!

Answer 2

I don't have how to do this with Angular and Rails, but this is how I did it in my Rails app.
def show
#controller action
#FbInfoforFrontEnd = FbModel.from_omniauth(request.env["omniauth.auth"])
end
and in the FbModel model, I'd implement the mechanism to save the token and rest of the info like this
def self.from_omniauth(auth)
#FbModel model method
oauth = Koala::Facebook::OAuth.new(AppId, AppSecret)
new_access_info = oauth.exchange_access_token_info auth.credentials.token
new_access_token = new_access_info["access_token"]
new_access_expires_at = DateTime.now + new_access_info["expires"].to_i.seconds
return FbModel.where(provider: auth.provider,
uid: auth.uid)
.first_or_create(provider: auth.provider,
uid: auth.uid,
name: auth.info.name)
.update_attributes(oauth_expires_at: new_access_expires_at,
oauth_token: new_access_token)
end
I hope this answers your query