Merge branch 'facebook-auth' into 'master'

Add Facebook authentication

See merge request !1740

12 files changed, 125 insertions, 14 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 16055208db5..0ec6030b130 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -26,6 +26,7 @@ v 8.2.0 (unreleased)
 v 8.1.3
   - Spread out runner contacted_at updates
   - New design for user profile page
+  - Add Facebook authentication
 
 v 8.1.1
   - Fix cloning Wiki repositories via HTTP (Stan Hu)
diff --git a/Gemfile b/Gemfile
index df260633091..0bac8978160 100644
--- a/Gemfile
+++ b/Gemfile
@@ -19,6 +19,7 @@ gem 'devise-async',           '~> 0.9.0'
 gem 'doorkeeper',             '~> 2.1.3'
 gem 'omniauth',               '~> 1.2.2'
 gem 'omniauth-bitbucket',     '~> 0.0.2'
+gem 'omniauth-facebook',      '~> 3.0.0'
 gem 'omniauth-github',        '~> 1.1.1'
 gem 'omniauth-gitlab',        '~> 1.0.0'
 gem 'omniauth-google-oauth2', '~> 0.2.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 030191fb80c..dce728baf18 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -423,6 +423,8 @@ GEM
       multi_json (~> 1.7)
       omniauth (~> 1.1)
       omniauth-oauth (~> 1.0)
+    omniauth-facebook (3.0.0)
+      omniauth-oauth2 (~> 1.2)
     omniauth-github (1.1.2)
       omniauth (~> 1.0)
       omniauth-oauth2 (~> 1.1)
@@ -859,6 +861,7 @@ DEPENDENCIES
   octokit (~> 3.7.0)
   omniauth (~> 1.2.2)
   omniauth-bitbucket (~> 0.0.2)
+  omniauth-facebook (~> 3.0.0)
   omniauth-github (~> 1.1.1)
   omniauth-gitlab (~> 1.0.0)
   omniauth-google-oauth2 (~> 0.2.0)
diff --git a/app/assets/images/auth_buttons/facebook_64.png b/app/assets/images/auth_buttons/facebook_64.png
new file mode 100644
index 00000000000..1f1a80d7368
--- /dev/null
+++ b/app/assets/images/auth_buttons/facebook_64.png
diff --git a/app/helpers/auth_helper.rb b/app/helpers/auth_helper.rb
index cd99a232403..2c81ea1623c 100644
--- a/app/helpers/auth_helper.rb
+++ b/app/helpers/auth_helper.rb
@@ -1,5 +1,5 @@
 module AuthHelper
-  PROVIDERS_WITH_ICONS = %w(twitter github gitlab bitbucket google_oauth2).freeze
+  PROVIDERS_WITH_ICONS = %w(twitter github gitlab bitbucket google_oauth2 facebook).freeze
   FORM_BASED_PROVIDERS = [/\Aldap/, 'crowd'].freeze
 
   def ldap_enabled?
diff --git a/config/gitlab.yml.example b/config/gitlab.yml.example
index e297f393e3d..20894ebcdc9 100644
--- a/config/gitlab.yml.example
+++ b/config/gitlab.yml.example
@@ -274,27 +274,28 @@ production: &base
     # arguments, followed by optional 'args' which can be either a hash or an array.
     # Documentation for this is available at http://doc.gitlab.com/ce/integration/omniauth.html
     providers:
-      # - { name: 'google_oauth2',
-      #     label: 'Google',
-      #     app_id: 'YOUR_APP_ID',
-      #     app_secret: 'YOUR_APP_SECRET',
-      #     args: { access_type: 'offline', approval_prompt: '' } }
-      # - { name: 'twitter',
-      #     app_id: 'YOUR_APP_ID',
-      #     app_secret: 'YOUR_APP_SECRET' }
       # - { name: 'github',
-      #     label: 'GitHub',
       #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET',
       #     args: { scope: 'user:email' } }
+      # - { name: 'bitbucket',
+      #     app_id: 'YOUR_APP_ID',
+      #     app_secret: 'YOUR_APP_SECRET' }
       # - { name: 'gitlab',
-      #     label: 'GitLab.com',
       #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET',
       #     args: { scope: 'api' } }
-      # - { name: 'bitbucket',
+      # - { name: 'google_oauth2',
+      #     app_id: 'YOUR_APP_ID',
+      #     app_secret: 'YOUR_APP_SECRET',
+      #     args: { access_type: 'offline', approval_prompt: '' } }
+      # - { name: 'facebook',
       #     app_id: 'YOUR_APP_ID',
       #     app_secret: 'YOUR_APP_SECRET' }
+      # - { name: 'twitter',
+      #     app_id: 'YOUR_APP_ID',
+      #     app_secret: 'YOUR_APP_SECRET' }
+      #
       # - { name: 'saml',
       #     label: 'Our SAML Provider',
       #     args: {
diff --git a/doc/integration/facebook.md b/doc/integration/facebook.md
new file mode 100644
index 00000000000..bc1f1673086
--- /dev/null
+++ b/doc/integration/facebook.md
@@ -0,0 +1,97 @@
+# Facebook OAuth2 OmniAuth Provider
+
+To enable the Facebook OmniAuth provider you must register your application with Facebook. Facebook will generate an app ID and secret key for you to use.
+
+1.  Sign in to the [Facebook Developer Platform](https://developers.facebook.com/).
+
+1. Choose "My Apps" > "Add a New App"
+
+1. Select the type "Website"
+
+1. Enter a name for your app. This can be anything. Consider something like "<Organization>'s GitLab" or "<Your Name>'s GitLab" or
+something else descriptive.
+
+1. Choose "Create New Facebook App ID"
+
+1. Select a Category, for example "Productivity"
+
+1. Choose "Create App ID"
+
+1. Enter the address of your GitLab installation at the bottom of the package
+
+    ![Facebook Website URL](facebook_website_url.png)
+
+1. Choose "Next"
+
+1. Choose "Skip Quick Start" in the upper right corner
+
+1. Choose "Settings" in the menu on the left
+
+1. Fill in a contact email for your app
+
+    ![Facebook App Settings](facebook_app_settings.png)
+
+1. Choose "Save Changes"
+
+1. Choose "Status & Review" in the menu on the left
+
+1. Change the switch on the right from No to Yes
+
+1. Choose "Confirm" when prompted to make the app public
+
+1. Choose "Dashboard" in the menu on the left
+
+1. Choose "Show" next to the hidden "App Secret"
+
+1. You should now see an app key and app secret (see screenshot). Keep this page open as you continue configuration.
+
+    ![Facebook API Keys](facebook_api_keys.png)
+
+1.  On your GitLab server, open the configuration file.
+
+    For omnibus package:
+
+    ```sh
+    sudo editor /etc/gitlab/gitlab.rb
+    ```
+
+    For installations from source:
+
+    ```sh
+    cd /home/git/gitlab
+
+    sudo -u git -H editor config/gitlab.yml
+    ```
+
+1.  See [Initial OmniAuth Configuration](omniauth.md#initial-omniauth-configuration) for initial settings.
+
+1.  Add the provider configuration:
+
+    For omnibus package:
+
+    ```ruby
+    gitlab_rails['omniauth_providers'] = [
+      {
+        "name" => "facebook",
+        "app_id" => "YOUR_APP_ID",
+        "app_secret" => "YOUR_APP_SECRET"
+      }
+    ]
+    ```
+
+    For installations from source:
+
+    ```
+    - { name: 'facebook', app_id: 'YOUR_APP_ID',
+      app_secret: 'YOUR_APP_SECRET' }
+    ```
+
+1.  Change 'YOUR_APP_ID' to the API key from Facebook page in step 10.
+
+1.  Change 'YOUR_APP_SECRET' to the API secret from the Facebook page in step 10.
+
+1.  Save the configuration file.
+
+1.  Restart GitLab for the changes to take effect.
+
+On the sign in page there should now be a Facebook icon below the regular sign in form. Click the icon to begin the authentication process. Facebook will ask the user to sign in and authorize the GitLab application. If everything goes well the user will be returned to GitLab and will be signed in.
diff --git a/doc/integration/facebook_api_keys.png b/doc/integration/facebook_api_keys.png
new file mode 100644
index 00000000000..d6c44ac0f11
--- /dev/null
+++ b/doc/integration/facebook_api_keys.png
diff --git a/doc/integration/facebook_app_settings.png b/doc/integration/facebook_app_settings.png
new file mode 100644
index 00000000000..30dd21e198a
--- /dev/null
+++ b/doc/integration/facebook_app_settings.png
diff --git a/doc/integration/facebook_website_url.png b/doc/integration/facebook_website_url.png
new file mode 100644
index 00000000000..dc3088bb2fa
--- /dev/null
+++ b/doc/integration/facebook_website_url.png
diff --git a/doc/integration/omniauth.md b/doc/integration/omniauth.md
index c5cecbc2f2d..bd9550c6ddb 100644
--- a/doc/integration/omniauth.md
+++ b/doc/integration/omniauth.md
@@ -73,8 +73,9 @@ Now we can choose one or more of the Supported Providers below to continue confi
 - [Bitbucket](bitbucket.md)
 - [GitLab.com](gitlab.md)
 - [Google](google.md)
-- [Shibboleth](shibboleth.md)
+- [Facebook](facebook.md)
 - [Twitter](twitter.md)
+- [Shibboleth](shibboleth.md)
 - [SAML](saml.md)
 - [Crowd](crowd.md)
 
diff --git a/lib/gitlab/o_auth/provider.rb b/lib/gitlab/o_auth/provider.rb
index 90c3fe8da33..9ad7a38d505 100644
--- a/lib/gitlab/o_auth/provider.rb
+++ b/lib/gitlab/o_auth/provider.rb
@@ -1,6 +1,12 @@
 module Gitlab
   module OAuth
     class Provider
+      LABELS = {
+        "github"         => "GitHub",
+        "gitlab"         => "GitLab.com",
+        "google_oauth2"  => "Google"
+      }.freeze
+
       def self.providers
         Devise.omniauth_providers
       end
@@ -23,8 +29,9 @@ module Gitlab
       end
 
       def self.label_for(name)
+        name = name.to_s
         config = config_for(name)
-        (config && config['label']) || name.to_s.titleize
+        (config && config['label']) || LABELS[name] || name.titleize
       end
     end
   end