Facebook OAuth is not returning email in user info

Question

I'm doing a spree 3.0 installation (ROR) and trying to use facebook oauth for authentication, but the fields sent back after a successful oauth, do NOT contain the email, which is critical to our application. here is the return from the facebook successful authentication.

#<OmniAuth::AuthHash credentials=#<OmniAuth::AuthHash expires=true expires_at=1442435073 token="CAAJa3dyBtY4BAJ2ZB3vrenNOFJKSMtvxYO09ZCJtEsmKNBs90q9nmUF4LIBr06xCizEAR3lwht3BwycLkVFdjlvkS1AUGpYODQHu25K0uO8XLDDPkTO0E9oPdIILsbTTOuIT7qcl8nJ6501z0dCXEi9hVNwPYqZBbGqiEhyoLyVgCNnDWdPRLBRF5xSovJdhjjCf6XC8ulJ4NnKBfM8"> extra=#<OmniAuth::AuthHash raw_info=#<OmniAuth::AuthHash id="101230990227589" name="David Alajbbjfdjgij Bowersstein">> info=#<OmniAuth::AuthHash::InfoHash image="http://graph.facebook.com/101230990227589/picture" name="David Alajbbjfdjgij Bowersstein"> provider="facebook" uid="101230990227589"

as you can see, all i get back is the user name and their ID. Is there some setting on my facebook app that i need to check in order to get the email back? or is there a different way i'm supposed to do Oauth? I'm just using the spree_social gem which does this all internally so i've actually not written any code around this.

here is the code. copied out of the gem, i just added the logging lines to see what was coming back from facebook.

    def #{provider}
      authentication = Spree::UserAuthentication.find_by_provider_and_uid(auth_hash['provider'], auth_hash['uid'])

      if authentication.present? and authentication.try(:user).present?
        flash[:notice] = I18n.t('devise.omniauth_callbacks.success', kind: auth_hash['provider'])
        sign_in_and_redirect :spree_user, authentication.user
      elsif spree_current_user
        spree_current_user.apply_omniauth(auth_hash)
        spree_current_user.save!
        flash[:notice] = I18n.t('devise.sessions.signed_in')
        redirect_back_or_default(account_url)
      else
        user = Spree::User.find_by_email(auth_hash['info']['email']) || Spree::User.new
        user.apply_omniauth(auth_hash)
        Rails.logger.debug("THE AUTO HASH")
        Rails.logger.debug(auth_hash.inspect)
        if user.save
          flash[:notice] = I18n.t('devise.omniauth_callbacks.success', kind: auth_hash['provider'])
          sign_in_and_redirect :spree_user, user
        else
          session[:omniauth] = auth_hash.except('extra')
          flash[:notice] = Spree.t(:one_more_step, kind: auth_hash['provider'].capitalize)
          redirect_to new_spree_user_registration_url
          return
        end
      end

      if current_order
        user = spree_current_user || authentication.user
        current_order.associate_user!(user)
        session[:guest_token] = nil
      end
    end

Answer 1

Facebook just released latest APIv2.4 that does not return email by default but we need to explicitly specify what fields to use.

Introducing Graph API v2.4

Now, on the very latest omniauth-facebook(possibly 2.1.0), "email" fields are specified by default and just works.

Fix default info_fields to 'name,email' #209

Or, you can just specify like

options['info_fields']='id,email,gender,link,locale,name,timezone,updated_time,verified';