Added Instagram login method

Gemfile

@@ -78,6 +78,7 @@ gem 'omniauth-openid'
 gem 'openid-redis-store'
 gem 'omniauth-facebook'
 gem 'omniauth-twitter'
+gem 'omniauth-instagram'
 
 # forked while https://github.com/intridea/omniauth-github/pull/41 is being upstreamd
 gem 'omniauth-github-discourse', require: 'omniauth-github'

app/assets/javascripts/discourse/models/login_method.js

@@ -37,6 +37,7 @@ Discourse.LoginMethod.reopenClass({
       "cas",
       "twitter",
       "yahoo",
+      "instagram",
       "github"
     ].forEach(function(name){
       if (Discourse.SiteSettings["enable_" + name + "_logins"]) {

app/assets/stylesheets/common/components/buttons.css.scss

@@ -129,6 +129,12 @@
       content: $fa-var-google;
     }
   }
+  &.instagram {
+    background: $instagram;
+    &:before {
+      content: $fa-var-instagram;
+    }
+  }
   &.facebook {
     background: $facebook;
     &:before {

app/assets/stylesheets/common/foundation/variables.scss

@@ -13,6 +13,7 @@ $large-width: 1110px !default;
 // --------------------------------------------------
 
 $google: #5b76f7 !default;
+$instagram: #125688 !default;
 $facebook: #3b5998 !default;
 $cas: #70BA61 !default;
 $twitter: #00bced !default;

app/controllers/users/omniauth_callbacks_controller.rb

@@ -10,7 +10,8 @@ class Users::OmniauthCallbacksController < ApplicationController
     Auth::GoogleOAuth2Authenticator.new,
     Auth::OpenIdAuthenticator.new("yahoo", "https://me.yahoo.com", trusted: true),
     Auth::GithubAuthenticator.new,
-    Auth::TwitterAuthenticator.new
+    Auth::TwitterAuthenticator.new,
+    Auth::InstagramAuthenticator.new
   ]
 
   skip_before_filter :redirect_to_login_if_required
@@ -18,7 +19,7 @@ class Users::OmniauthCallbacksController < ApplicationController
   layout false
 
   def self.types
-    @types ||= Enum.new(:facebook, :twitter, :google, :yahoo, :github, :persona, :cas)
+    @types ||= Enum.new(:facebook, :instagram, :twitter, :google, :yahoo, :github, :persona, :cas)
   end
 
   # need to be able to call this

app/models/instagram_user_info.rb

@@ -0,0 +1,5 @@
+class InstagramUserInfo < ActiveRecord::Base
+
+  belongs_to :user
+
+end

config/locales/client.en.yml

@@ -882,6 +882,9 @@ en:
       twitter:
         title: "with Twitter"
         message: "Authenticating with Twitter (make sure pop up blockers are not enabled)"
+      instagram:
+        title: "with Instagram"
+        message: "Authenticating with Instagram (make sure pop up blockers are not enabled)"
       facebook:
         title: "with Facebook"
         message: "Authenticating with Facebook (make sure pop up blockers are not enabled)"

config/locales/server.en.yml

@@ -939,6 +939,10 @@ en:
     twitter_consumer_key: "Consumer key for Twitter authentication, registered at http://dev.twitter.com"
     twitter_consumer_secret: "Consumer secret for Twitter authentication, registered at http://dev.twitter.com"
 
+    enable_instagram_logins: "Enable Instagram authentication, requires instagram_consumer_key and instagram_consumer_secret"
+    instagram_consumer_key: "Consumer key for Instagram authentication"
+    instagram_consumer_secret: "Consumer secret Instagram authentication"
+
     enable_facebook_logins: "Enable Facebook authentication, requires facebook_app_id and facebook_app_secret"
     facebook_app_id: "App id for Facebook authentication, registered at https://developers.facebook.com/apps"
     facebook_app_secret: "App secret for Facebook authentication, registered at https://developers.facebook.com/apps"

config/site_settings.yml

@@ -234,6 +234,15 @@ login:
   twitter_consumer_secret:
     default: ''
     regex: "^[a-zA-Z0-9_+-]+$"
+  enable_instagram_logins:
+    client: true
+    default: false
+  instagram_consumer_key:
+    default: ''
+    regex: "^[a-z0-9]+$"
+  instagram_consumer_secret:
+    default: ''
+    regex: "^[a-z0-9]+$"
   enable_facebook_logins:
     client: true
     default: false

db/migrate/20160224033122_create_instagram_user_infos.rb

@@ -0,0 +1,11 @@
+class CreateInstagramUserInfos < ActiveRecord::Migration
+  def change
+    create_table :instagram_user_infos do |t|
+      t.integer :user_id
+      t.string :screen_name
+      t.integer :instagram_user_id
+
+      t.timestamps null: false
+    end
+  end
+end

lib/auth.rb

@@ -7,3 +7,4 @@ require_dependency 'auth/open_id_authenticator'
 require_dependency 'auth/github_authenticator'
 require_dependency 'auth/twitter_authenticator'
 require_dependency 'auth/google_oauth2_authenticator'
+require_dependency 'auth/instagram_authenticator'

lib/auth/instagram_authenticator.rb

@@ -0,0 +1,49 @@
+class Auth::InstagramAuthenticator < Auth::Authenticator
+
+  def name
+    "instagram"
+  end
+
+  # TODO twitter provides all sorts of extra info, like website/bio etc.
+  #  it may be worth considering pulling some of it in.
+  def after_authenticate(auth_token)
+
+    result = Auth::Result.new
+
+    data = auth_token[:info]
+
+    result.username = screen_name = data["nickname"]
+    result.name = name = data["name"]
+    instagram_user_id = auth_token["uid"]
+
+    result.extra_data = {
+      instagram_user_id: instagram_user_id,
+      instagram_screen_name: screen_name
+    }
+
+    user_info = InstagramUserInfo.find_by(instagram_user_id: instagram_user_id)
+
+    result.user = user_info.try(:user)
+
+    result
+  end
+
+  def after_create_account(user, auth)
+    data = auth[:extra_data]
+    InstagramUserInfo.create(
+      user_id: user.id,
+      screen_name: data[:instagram_screen_name],
+      instagram_user_id: data[:instagram_user_id]
+    )
+  end
+
+  def register_middleware(omniauth)
+    omniauth.provider :instagram,
+           :setup => lambda { |env|
+              strategy = env["omniauth.strategy"]
+              strategy.options[:client_id] = SiteSetting.instagram_consumer_key
+              strategy.options[:client_secret] = SiteSetting.instagram_consumer_secret
+           }
+  end
+
+end