Fix root_url bug when using a slash

When settings the root_url to a slash the
paths in the local_settings.py and apache config
will be wrong. This patch fixes that issue.

Change-Id: Ib64b22bb88b2827ea4be2eb8356aa404984ee0ba
Closes-Bug: 1651720

manifests/wsgi/apache.pp

@@ -141,6 +141,13 @@ class horizon::wsgi::apache (
     require => Package['horizon'],
   }
 
+  # NOTE(tobasco): If root_url is set to '/' the paths in the apache
+  # configuration will be wrong (double slashes) so we fix that here.
+  if $root_url == '/' {
+    $root_url_real = ''
+  } else {
+    $root_url_real = $root_url
+  }
 
   if $listen_ssl {
     include ::apache::mod::ssl
@@ -160,7 +167,7 @@ class horizon::wsgi::apache (
     }
 
   } else {
-    case $root_url {
+    case $root_url_real {
       '': {
         $ensure_ssl_vhost = 'absent'
         $redirect_match = "^${::horizon::params::root_url}\$"
@@ -169,7 +176,7 @@ class horizon::wsgi::apache (
       default: {
         $ensure_ssl_vhost = 'absent'
         $redirect_match = '^/$'
-        $redirect_url   = $root_url
+        $redirect_url   = $root_url_real
       }
     }
   }
@@ -202,9 +209,9 @@ class horizon::wsgi::apache (
     require => [ File[$::horizon::params::logdir], Package['horizon'] ],
   }
 
-  $script_url = $root_url ? {
+  $script_url = $root_url_real ? {
     ''      => '/',
-    default => $root_url,
+    default => $root_url_real,
   }
 
   $wsgi_daemon_process_options = merge(
@@ -226,7 +233,7 @@ class horizon::wsgi::apache (
     error_log_file              => 'horizon_error.log',
     priority                    => $priority,
     aliases                     => [{
-      alias => "${root_url}/static",
+      alias => "${root_url_real}/static",
       path  => "${root_path}/static",
     }],
     port                        => $http_port,
@@ -253,8 +260,8 @@ class horizon::wsgi::apache (
   }
 
   ensure_resource('apache::vhost', $vhost_conf_name, merge ($default_vhost_conf, $extra_params, {
-    redirectmatch_regexp => $root_url ? { '' => undef, '/' => undef, default => $redirect_match },
-    redirectmatch_dest   => $root_url ? { '' => undef, '/' => undef, default => $redirect_url },
+    redirectmatch_regexp => $root_url_real ? { '' => undef, '/' => undef, default => $redirect_match },
+    redirectmatch_dest   => $root_url_real ? { '' => undef, '/' => undef, default => $redirect_url },
   }))
   ensure_resource('apache::vhost', $vhost_ssl_conf_name, merge ($default_vhost_conf, $extra_params, {
     access_log_file      => 'horizon_ssl_access.log',
@@ -265,8 +272,8 @@ class horizon::wsgi::apache (
     ensure               => $ensure_ssl_vhost,
     wsgi_daemon_process  => 'horizon-ssl',
     wsgi_process_group   => 'horizon-ssl',
-    redirectmatch_regexp => $root_url ? { '' => undef, '/' => undef, default => '^/$' },
-    redirectmatch_dest   => $root_url ? { '' => undef, '/' => undef, default => $root_url },
+    redirectmatch_regexp => $root_url_real ? { '' => undef, '/' => undef, default => '^/$' },
+    redirectmatch_dest   => $root_url_real ? { '' => undef, '/' => undef, default => $root_url_real },
   }))
 
 }

releasenotes/notes/horizon-fix-invalid-root-url-0c8e54a5c6de2f5e.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed a bug where passing a '/' as root_url would cause faulty paths in
+    local_settings.py and apache configuration. You can now set it to '/' and
+    the module will fix the correct root url for you.

spec/classes/horizon_wsgi_apache_spec.rb

@@ -202,9 +202,17 @@ describe 'horizon::wsgi::apache' do
         before do
           params.merge!({
             :root_url => '/',
+            :root_path => '/tmp/horizon'
           })
         end
 
+        it 'configures apache with correct root url' do
+          is_expected.to contain_apache__vhost('horizon_vhost').with(
+            'aliases'             => [{'alias' => '/static', 'path' => '/tmp/horizon/static'}],
+            'wsgi_script_aliases' => { '/' => '/usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi' },
+          )
+        end
+
         it 'should not configure redirectmatch' do
           is_expected.to_not contain_apache__vhost('horizon_vhost').with(
             'redirectmatch_regexp' => '^/$',

templates/local_settings.py.erb

@@ -15,15 +15,25 @@ TEMPLATE_DEBUG = DEBUG
 # should end with a slash.
 #LOGIN_URL = WEBROOT + 'auth/login/'
 #LOGOUT_URL = WEBROOT + 'auth/logout/'
+<% if @root_url == '/' %>
+WEBROOT = '/'
+LOGIN_URL = '/auth/login/'
+LOGOUT_URL = '/auth/logout/'
+<% else %>
 WEBROOT = '<%= @root_url %>/'
 LOGIN_URL = '<%= @root_url %>/auth/login/'
 LOGOUT_URL = '<%= @root_url %>/auth/logout/'
+<% end %>
 
 # LOGIN_REDIRECT_URL can be used as an alternative for
 # HORIZON_CONFIG.user_home, if user_home is not set.
 # Do not set it to '/home/', as this will cause circular redirect loop
 #LOGIN_REDIRECT_URL = WEBROOT
+<% if @root_url == '/' %>
+LOGIN_REDIRECT_URL = '/'
+<% else %>
 LOGIN_REDIRECT_URL = '<%= @root_url %>/'
+<% end %>
 
 # Required for Django 1.5.
 # If horizon is running in production (DEBUG is False), set this