Updated the admin screen more.

admin/islandora.admin.inc

@@ -74,11 +74,6 @@ function islandora_repository_admin($form, &$form_state) {
     ),
   );
 
-  $form['islandora_tabs']['islandora_namespace'] = array(
-    '#type' => 'fieldset',
-    '#title' => t('Namespaces'),
-  );
-
   $form['islandora_tabs']['islandora_general']['islandora_repository_pid'] = array(
     '#type' => 'textfield',
     '#title' => t('Root Collection PID'),
@@ -87,21 +82,48 @@ function islandora_repository_admin($form, &$form_state) {
     '#required' => TRUE,
   );
 
-  $form['islandora_tabs']['islandora_namespace']['islandora_namespace_restriction_enforced'] = array(
+  $form['islandora_tabs']['islandora_namespace'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('Namespaces'),
+  );
+
+  $form['islandora_tabs']['islandora_namespace']['wrapper'] = array(
+    '#type' => 'markup',
+    '#prefix' => '<div id="islandora-namespace">',
+    '#suffix' => '</div>',
+  );
+
+  $form['islandora_tabs']['islandora_namespace']['wrapper']['islandora_namespace_restriction_enforced'] = array(
     '#weight' => -1,
     '#type' => 'checkbox',
     '#title' => t('Enforce namespace restrictions'),
     '#description' => t('Allow administrator to restrict user\'s access to the PID namepaces listed below'),
     '#default_value' => variable_get('islandora_namespace_restriction_enforced', FALSE),
+    '#ajax' => array(
+      'callback' => 'islandora_update_namespace_div',
+      'wrapper' => 'islandora-namespace',
+      'effect' => 'fade',
+      'event' => 'change',
+      'progress' => array('type' => 'throbber'),
+    ),
   );
+  
+  if(isset($form_state['values']['islandora_namespace_restriction_enforced'])) {
+    $namespaces = $form_state['values']['islandora_namespace_restriction_enforced'];
+  }
+  else {
+    $namespaces = variable_get('islandora_namespace_restriction_enforced', FALSE);
+  }
 
-  $form['islandora_tabs']['islandora_namespace']['islandora_pids_allowed'] = array(
-    '#type' => 'textfield',
-    '#title' => t('PID namespaces allowed in this Drupal install'),
-    '#default_value' => variable_get('islandora_pids_allowed', 'default: demo: changeme: ilives: islandora-book: books: newspapers: '),
-    '#description' => t('A space separated list of PID namespaces that users are permitted to access from this Drupal installation. <br /> This could be more than a simple namespace ie demo:mydemos. <br> islandora: is reserved and is always allowed.'),
-    '#weight' => 0,
-  );
+  if($namespaces) {
+    $form['islandora_tabs']['islandora_namespace']['wrapper']['islandora_pids_allowed'] = array(
+      '#type' => 'textfield',
+      '#title' => t('PID namespaces allowed in this Drupal install'),
+      '#default_value' => variable_get('islandora_pids_allowed', 'default: demo: changeme: ilives: islandora-book: books: newspapers: '),
+      '#description' => t('A space separated list of PID namespaces that users are permitted to access from this Drupal installation. <br /> This could be more than a simple namespace ie demo:mydemos. <br> islandora: is reserved and is always allowed.'),
+      '#weight' => 0,
+    );
+  }
 
   return system_settings_form($form);
 }
@@ -114,4 +136,14 @@ function islandora_update_url_div($form, $form_state) {
   $form_state['rebuild'] = TRUE;
 
   return $form['islandora_tabs']['islandora_general']['wrapper'];
+}
+
+/**
+ * Checks url validity and refreshes requestHandler dropdown list
+ */
+function islandora_update_namespace_div($form, $form_state) {
+  unset($form_state['submit_handlers']);
+  $form_state['rebuild'] = TRUE;
+  
+  return $form['islandora_tabs']['islandora_namespace']['wrapper'];
 }

islandora.module

@@ -56,7 +56,7 @@ function islandora_menu() {
     'file' => 'admin/islandora.admin.inc',
     'access arguments' => array('administer site configuration'),
     'type' => MENU_NORMAL_ITEM,
-    'weight' => 0,
+    'weight' => -1,
   );
 
   $items['islandora/ingest/%'] = array(
@@ -238,14 +238,14 @@ function islandora_node_access($op, $pid = NULL, $as_user = NULL) {
     $pid = variable_get('fedora_repository_pid', 'islandora:root');
   }
 
-  $isRestricted = variable_get('fedora_namespace_restriction_enforced', TRUE);
+  $isRestricted = variable_get('islandora_namespace_restriction_enforced', FALSE);
   $namespace_access = NULL;
   if (!$isRestricted) {
     $namespace_access = TRUE;
   }
   else {
     $pid_namespace = substr($pid, 0, strpos($pid, ':') + 1); //Get the namespace (with colon)
-    $allowed_namespaces = explode(" ", variable_get('fedora_pids_allowed', 'default: demo: changeme: islandora: ilives: islandora-book: books: newspapers: '));
+    $allowed_namespaces = explode(" ", variable_get('islandora_pids_allowed', 'default: demo: changeme: islandora: ilives: islandora-book: books: newspapers: '));
 
     $namespace_access = in_array($pid_namespace, $allowed_namespaces);
   }

islandora_basic_collection/includes/ChildCollection.inc

@@ -18,9 +18,9 @@ function islandora_create_child_collection_form($form, &$form_state, $this_colle
   $rest_connection = new RestConnection();
 
   $restricted = FALSE;
-  if (variable_get('fedora_namespace_restriction_enforced', TRUE)) {
+  if (variable_get('islandora_namespace_restriction_enforced', FALSE)) {
     $restricted = TRUE;
-    $allowed_string = variable_get('fedora_pids_allowed', 'default: demo: changeme: islandora:');
+    $allowed_string = variable_get('islandora_pids_allowed', 'default: demo: changeme: islandora:');
     $namespaces = explode(':', $allowed_string);
     foreach ($namespaces as $namespace) {
       if ($namespace) {

islandora_basic_collection/includes/CollectionManagement.inc

@@ -136,14 +136,14 @@ function get_related_items_as_array($collection_pid, $relationship = array('isMe
   function fedora_repository_access($permission, $pid) {
     global $user;
     $name_space_access = FALSE;
-    $is_restricted = variable_get('islandora_namespace_restriction_enforced', TRUE);
+    $is_restricted = variable_get('islandora_namespace_restriction_enforced', FALSE);
     if (!$is_restricted) {
       $name_space_access = TRUE;
     }
     if ($pid == NULL) {
       $pid = variable_get('islandora_repository_pid', 'islandora:root');
     }
-    $name_space_allowed = explode(" ", variable_get('fedora_pids_allowed', 'default: demo: changeme: islandora: ilives: islandora-book: books: newspapers: '));
+    $name_space_allowed = explode(" ", variable_get('islandora_pids_allowed', 'default: demo: changeme: islandora: ilives: islandora-book: books: newspapers: '));
     $pos = NULL;
     foreach ($name_space_allowed as $name_space) {
       $pos = stripos($pid, $name_space);
@@ -208,8 +208,8 @@ function get_content_models_as_option_array() {
   $rest_connection = new RestConnection();
     require_once 'sites/all/libraries/tuque/RepositoryQuery.php';
 
-    $restricted = variable_get('fedora_namespace_restriction_enforced', TRUE);
-    $allowed_string = variable_get('fedora_pids_allowed', 'default: demo: changeme: islandora:');
+    $restricted = variable_get('islandora_namespace_restriction_enforced', FALSE);
+    $allowed_string = variable_get('islandora_pids_allowed', 'default: demo: changeme: islandora:');
     $namespaces = explode(':', $allowed_string);
     foreach ($namespaces as $namespace) {
         if ($namespace) {

islandora_basic_collection/includes/CollectionManagerTable.inc

@@ -90,8 +90,8 @@ function get_collections_as_option_array() {
   module_load_include('inc', 'islandora', 'RestConnection');
   require_once 'sites/all/libraries/tuque/RepositoryQuery.php';
 
-  $restricted = variable_get('fedora_namespace_restriction_enforced', TRUE);
-  $allowed_string = variable_get('fedora_pids_allowed', 'default: demo: changeme: islandora:');
+  $restricted = variable_get('islandora_namespace_restriction_enforced', FALSE);
+  $allowed_string = variable_get('islandora_pids_allowed', 'default: demo: changeme: islandora:');
   $namespaces = explode(':', $allowed_string);
 
   $rest_connection = new RestConnection();