Admin: Add plugin_settings config to disable BBB settings

And use them in priority

See BT#18666

main/inc/lib/plugin.class.php

@@ -199,7 +199,6 @@ class Plugin
     public function getSettingsForm()
     {
         $result = new FormValidator($this->get_name());
-
         $defaults = [];
         $checkboxGroup = [];
         $checkboxCollection = [];
@@ -213,6 +212,8 @@ class Plugin
             }
         }
 
+        $disableSettings = $this->disableSettings();
+
         foreach ($this->fields as $name => $type) {
             $options = null;
             if (is_array($type) && isset($type['type']) && $type['type'] === 'select') {
@@ -226,6 +227,12 @@ class Plugin
                 $type = $type['type'];
             }
 
+            if (!empty($disableSettings)) {
+                if (in_array($name, $disableSettings)) {
+                    continue;
+                }
+            }
+
             $value = $this->get($name);
             $defaults[$name] = $value;
             $type = isset($type) ? $type : 'text';
@@ -336,6 +343,16 @@ class Plugin
      */
     public function get($name)
     {
+        $settings = api_get_configuration_value('plugin_settings');
+        if (!empty($settings) && isset($settings[$this->get_name()])) {
+            $prioritySettings = $settings[$this->get_name()];
+            if (!empty($prioritySettings)) {
+                if (isset($prioritySettings[$name])) {
+                    return $prioritySettings[$name];
+                }
+            }
+        }
+
         $settings = $this->get_settings();
         foreach ($settings as $setting) {
             if ($setting['variable'] == $this->get_name().'_'.$name) {
@@ -1040,6 +1057,20 @@ class Plugin
     {
     }
 
+    /**
+     * Disable the settings configured in configuration.php ($configuration[plugin_settings])
+     */
+    public function disableSettings()
+    {
+        $settings = api_get_configuration_value('plugin_settings');
+        if (!empty($settings) && isset($settings[$this->get_name()])) {
+
+            return array_keys($settings[$this->get_name()]);
+        }
+
+        return [];
+    }
+
     /**
      * Add an link for a course tool.
      *

main/install/configuration.dist.php

@@ -1853,6 +1853,15 @@ ALTER TABLE gradebook_comment ADD CONSTRAINT FK_C3B70763AD3ED51C FOREIGN KEY (gr
 // Show exercise report from all courses in a new page: exercise/pending.php
 //$_configuration['my_courses_show_pending_exercise_attempts'] = true;
 
+// Disables the following BBB plugin settings in the plugin form and use them in priority.
+/*$_configuration['plugin_settings'] = [
+    'bbb' => [
+        'tool_enable' => 'true', // string value
+        'host' => 'https://www.example.com',
+        'salt' => 'abc123'
+    ]
+];*/
+
 // KEEP THIS AT THE END
 // -------- Custom DB changes
 // Add user activation by confirmation email