Add instagram background implementation and generalize application for other identity providers

app/models/user.rb

@@ -13,7 +13,7 @@ class User
   property :oauth_expires_at
   property :auth_data
 
-  devise :database_authenticatable, :recoverable, :rememberable, :trackable, :omniauthable, :omniauth_providers => [:facebook] #, :token_authenticatable , :registerable
+  devise :database_authenticatable, :recoverable, :rememberable, :trackable, :omniauthable, :omniauth_providers => [:facebook, :instagram] #, :token_authenticatable , :registerable
 
   property :authentication_token
 
@@ -28,10 +28,11 @@ class User
 
   view :by_authentication_token, key: :authentication_token
   view :by_email, key: :email
-  view :by_facebook, key: [:provider, :uid]
+  view :by_facebook, key: [:provider, :uid] #DEPRICATE on successful change to by_provider
+  view :by_provider, key: [:provider, :uid]
 
-  def self.find_for_facebook_oauth(auth_data, user)
-    user = database.view(self.by_facebook(key: [auth_data.provider, auth_data.uid], limit: 1)).first
+  def self.find_for_oauth(auth_data, user)
+    user = database.view(self.by_provider(key: [auth_data.provider, auth_data.uid], limit: 1)).first
 
     user || create(
       provider: auth_data.provider,
@@ -49,6 +50,24 @@ class User
     uid
   end
 
+  def provider_info
+    case provider.to_sym
+    when :facebook then {}
+    when :instagram
+      uri = URI.parse("https://api.instagram.com/v1/users/#{uid}?access_token=#{auth_data['credentials']['token']}")
+      JSON.parse(Net::HTTP.get(uri)) rescue {ok: false, error: 'cannot_parse_response'}
+    else
+      {ok: false, error: 'provider_unknown'}
+    end
+  end
+
+  def avatar
+    case provider.to_sym
+    when :facebook then "http://graph.facebook.com/#{uid}/picture?type=square"
+    when :instagram then auth_data['info'].try(:[], 'image')
+    end
+  end
+
   def self.from_omniauth(auth)
     #binding.pry
   end