dummy LDAP auth source

I don't care if we have a company LDAP.
My thoughts go out to devs* who don't have that.

*OpenSource, right?

app/models/dummy_auth_source.rb

@@ -0,0 +1,39 @@
+class DummyAuthSource < AuthSource
+  def test_connection
+    # the dummy connection is always available
+  end
+
+  def authenticate(login, password)
+    existing_user(login, password) || on_the_fly_user(login)
+  end
+
+  def auth_method_name
+    'DerpLAP'
+  end
+
+  private
+
+  def existing_user(login, password)
+    registered_login?(login) && password == 'dummy'
+  end
+
+  def on_the_fly_user(login)
+    return nil unless onthefly_register?
+
+    {
+      firstname: login.capitalize,
+      lastname: 'Dummy',
+      mail: 'login@DerpLAP.net',
+      auth_source_id: self.id
+    }
+  end
+
+  def registered_login?(login)
+    not users.where(login: login).empty? # empty? to use EXISTS query
+  end
+
+  # Does this auth source backend allow password changes?
+  def self.allow_password_changes?
+    false
+  end
+end

lib/tasks/ldap.rake

@@ -0,0 +1,60 @@
+#-- encoding: UTF-8
+#-- copyright
+# OpenProject is a project management system.
+# Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See doc/COPYRIGHT.rdoc for more details.
+#++
+
+desc 'Creates a dummy LDAP auth source for logging in any user using the password "dummy".'
+namespace :ldap do
+  task create_dummy: :environment do
+    source_name = 'DerpLAP'
+    otf_reg = ARGV.include?('onthefly_register')
+
+    source = DummyAuthSource.create name: source_name, onthefly_register: otf_reg
+
+    puts
+    if source.valid?
+      puts "Created dummy auth source called \"#{source_name}\""
+      puts 'On-the-fly registration support: ' + otf_reg.to_s
+      unless otf_reg
+        puts "use `rake ldap:create_dummy[onthefly_register]` to enable on-the-fly registration"
+      end
+    else
+      puts "Dummy auth source already exists. It's called \"#{source_name}\"."
+    end
+
+    puts
+    puts 'Note: Dummy auth sources cannot be edited, so clicking on them'
+    puts "      in the 'LDAP Authentication' view will result in an error. Bummer!"
+  end
+
+  task delete_dummies: :environment do
+    DummyAuthSource.destroy_all
+
+    puts
+    puts 'Deleted all dummy auth sources. Users who used it are out of luck! :o'
+  end
+end