Change CDN location

Some european customers are not allowed to use CDN outside EU, there we need an option for this in the admin system.

cookiebot.admin.inc

@@ -21,6 +21,9 @@
 function cookiebot_settings_form($form, &$form_state) {
   $cbid = variable_get('cookiebot_cbid', '');
 
+  $cdn_location_select_value = array('0' => t('Choose a CDN location'));
+  $cdn_locations = array_merge($cdn_location_select_value, variable_get('cookiebot_valid_cdn_locations'));
+
   if (empty($cbid)) {
     drupal_set_message(t('Cookiebot functionality is disabled until you enter a valid CBID.'), 'warning');
   }
@@ -32,6 +35,13 @@ function cookiebot_settings_form($form, &$form_state) {
     '#default_value' => $cbid,
   );
 
+  $form['cookiebot_cdn_location'] = array(
+    '#type' => 'select',
+    '#options' => $cdn_locations,
+    '#default_value' => variable_get('cookiebot_cdn_location', '0'),
+    '#description' => t('We offer a strictly European based version of the Cookiebot CMP for our European customers.')
+  );
+
   $form['cookiebot_block_cookies'] = [
     '#type' => 'checkbox',
     '#title' => t('Automatically block all cookies'),
@@ -171,6 +181,11 @@ function cookiebot_settings_form_validate($form, &$form_state) {
     form_set_error('cookiebot_cbid', t('The entered Domain Group ID is not formatted correctly.'));
   }
 
+
+  if ($form_state['values']['cookiebot_cdn_location'] === '0') {
+    form_set_error('cookiebot_cdn_location', t('The chosen CDN location is not valid.'));
+  }
+
   if (!empty($form_state['values']['cookiebot_show_declaration_node_id']) && !node_load($form_state['values']['cookiebot_show_declaration_node_id'])) {
     form_set_error('cookiebot_show_declaration_node_id', t('The entered node ID is invalid.'));
   }