Merge pull request #225 from joshua-arts/ldap

Add support for LDAP authentication.

config/initializers/omniauth.rb

@@ -1,11 +1,14 @@
 # frozen_string_literal: true
 
 # List of supported Omniauth providers.
-Rails.application.config.providers = [:google, :twitter]
+Rails.application.config.providers = [:google, :twitter, :ldap]
 
 # Set which providers are configured.
 Rails.application.config.omniauth_google = ENV['GOOGLE_OAUTH2_ID'].present? && ENV['GOOGLE_OAUTH2_SECRET'].present?
 Rails.application.config.omniauth_twitter = ENV['TWITTER_ID'].present? && ENV['TWITTER_SECRET'].present?
+Rails.application.config.omniauth_ldap = ENV['LDAP_SERVER'].present? && ENV['LDAP_UID'].present? &&
+                                         ENV['LDAP_BASE'].present? && ENV['LDAP_BIND_DN'].present? &&
+                                         ENV['LDAP_PASSWORD'].present?
 Rails.application.config.omniauth_bn_launcher = Rails.configuration.loadbalanced_configuration
 
 SETUP_PROC = lambda do |env|
@@ -16,9 +19,9 @@ end
 Rails.application.config.middleware.use OmniAuth::Builder do
   if Rails.configuration.omniauth_bn_launcher
     provider :bn_launcher, client_id: ENV['CLIENT_ID'],
-             client_secret: ENV['CLIENT_SECRET'],
-             client_options: { site: ENV['BN_LAUNCHER_REDIRECT_URI'] },
-             setup: SETUP_PROC
+      client_secret: ENV['CLIENT_SECRET'],
+      client_options: { site: ENV['BN_LAUNCHER_REDIRECT_URI'] },
+      setup: SETUP_PROC
   end
 
   provider :twitter, ENV['TWITTER_ID'], ENV['TWITTER_SECRET']
@@ -28,4 +31,43 @@ Rails.application.config.middleware.use OmniAuth::Builder do
     access_type: 'online',
     name: 'google',
     hd: ENV['GOOGLE_OAUTH2_HD'].blank? ? nil : ENV['GOOGLE_OAUTH2_HD']
+
+  provider :ldap,
+    host: ENV['LDAP_SERVER'],
+    port: ENV['LDAP_PORT'] || '389',
+    method: ENV['LDAP_METHOD'].blank? ? :plain : ENV['LDAP_METHOD'].to_sym,
+    allow_username_or_email_login: true,
+    uid: ENV['LDAP_UID'],
+    base: ENV['LDAP_BASE'],
+    bind_dn: ENV['LDAP_BIND_DN'],
+    password: ENV['LDAP_PASSWORD']
+end
+
+# Redirect back to login in development mode.
+OmniAuth.config.on_failure = proc { |env|
+  OmniAuth::FailureEndpoint.new(env).redirect_to_failure
+}
+
+# Work around beacuse callback_url option causes
+# omniauth.auth to be nil in the authhash when
+# authenticating with LDAP.
+module OmniAuthLDAPExt
+  def request_phase
+    rel_root = ENV['RELATIVE_URL_ROOT'].present? ? ENV['RELATIVE_URL_ROOT'] : '/b'
+
+    @callback_path = nil
+    path = options[:callback_path]
+    options[:callback_path] = "#{rel_root if Rails.env == 'production'}/auth/ldap/callback"
+    form = super
+    options[:callback_path] = path
+    form
+  end
+end
+
+module OmniAuth
+  module Strategies
+    class LDAP
+      prepend OmniAuthLDAPExt
+    end
+  end
 end