Adds editing of the config file

app/classes/config.php

@@ -2,6 +2,35 @@
 
 class Config {
 
+    // edit the config file
+    public function editConfigFile($updatedConfig) {
+        // first we get a fresh config file contents as text
+        $config_contents = file_get_contents($config_file);
+        if (!$config_contents) {
+            return "Failed to read the config file \"$config_file\".";
+        }
+
+        // loop through the variables and updated them
+        foreach ($updatedConfig as $key => $newValue) {
+            // we look for 'option' => value
+            // option is always in single quotes
+            // value is without quotes, because it could be true/false
+            $patterm = "/(['\"]{$key}['\"]\s*=>\s*)([^,]+),/"
+
+            // prepare the value and replace it
+            $replacementValue = var_export($newValue, true);
+            $config_contents = preg_replace($pattern, "$1{$replacementValue},", $config_contents);
+        }
+
+        // write the new config file
+        if (!file_put_contents($config_file, $config_contents)) {
+            return "Failed to write the config file \"$config_file\".";
+        }
+
+        return true;
+    }
+
+
     // loading the config.js
     public function getPlatformConfigjs($jitsiUrl, $raw = false) {
         // constructing the URL

app/pages/config.php

@@ -20,8 +20,17 @@ if ($_SERVER['REQUEST_METHOD'] == 'POST') {
 //    $content = file_get_contents($config_file);
 //    $updatedContent = $content;
 
+    // editing the config file
+    if (isset($_POST['item']) && $_POST['item'] === 'config_file') {
+        $result = $configObject->editConfigFile($_POST);
+        if ($result === true) {
+            $_SESSION['notice'] = "The config file is edited.";
+        } else {
+            $_SESSION['error'] = "Editing the config file failed. Error: $result";
+        }
+
     // new host adding
-    if (isset($_POST['new']) && isset($_POST['item']) && $_POST['new'] === 'true' && $_POST['item'] === 'host') {
+    } elseif (isset($_POST['new']) && isset($_POST['item']) && $_POST['new'] === 'true' && $_POST['item'] === 'host') {
         $newHost = [
             'address'       => $address,
             'port'          => $port,

app/templates/config-configfile-edit.php

@@ -6,7 +6,7 @@
                         <div class="card-text">
                             <p class="text-danger"><strong>this may break everything, use with extreme caution</strong></p>
                         </div>
-                        <form method="POST" action="<?= htmlspecialchars($app_root) ?>?platform=<?= htmlspecialchars($platform_id) ?>&page=config&item=config_file">
+                        <form method="POST" action="<?= htmlspecialchars($app_root) ?>?page=config&item=config_file">
 
 <?php
 include '../app/helpers/render.php';
@@ -15,12 +15,13 @@ echo "\n";
 ?>
 
                             <p class="text-danger"><strong>this may break everything, use with extreme caution</strong></p>
+                            <br />
+                            <input type="hidden" name="item" value="config_file" />
                             <a class="btn btn-outline-secondary btn-sm" href="<?= htmlspecialchars($app_root) ?>?page=config&item=config_file" />Cancel</a>
                             &nbsp;&nbsp;
                             <input type="submit" class="btn btn-danger btn-sm" value="Save" />
                         </form>
 
-
                     </div>
                 </div>
                 <!-- /widget "config file" -->