Add new possibility: to deny saving setting if condition is not met

admin/tools/settings_save.php

@@ -25,4 +25,10 @@ $settings = Settings::getInstance();
 
 $settings->save($_REQUEST['plugin'], $_POST['settings']);
 
+$errors = $settings->getErrors();
+if (count($errors) > 0) {
+	http_response_code(500);
+	die(implode('<br/>', $errors));
+}
+
 echo 'Saved at ' . date('H:i');

system/libs/Settings.php

@@ -15,6 +15,7 @@ class Settings implements ArrayAccess
 	private $settingsDatabase = [];
 	private $cache = [];
 	private $valuesAsked = [];
+	private $errors = [];
 
 	/**
 	 * @return Settings
@@ -67,12 +68,19 @@ class Settings implements ArrayAccess
 			}
 		}
 
+		$this->errors = [];
 		$db->query('DELETE FROM `' . TABLE_PREFIX . 'settings` WHERE `name` = ' . $db->quote($pluginName) . ';');
 		foreach ($values as $key => $value) {
+			$errorMessage = '';
+			if (isset($settings['settings'][$key]['callbacks']['beforeSave']) && !$settings['settings'][$key]['callbacks']['beforeSave']($key, $value, $errorMessage)) {
+				$this->errors[] = $errorMessage;
+				continue;
+			}
+
 			try {
 				$db->insert(TABLE_PREFIX . 'settings', ['name' => $pluginName, 'key' => $key, 'value' => $value]);
 			} catch (PDOException $error) {
-				warning('Error while saving setting (' . $pluginName . ' - ' . $key . '): ' . $error->getMessage());
+				$this->errors[] = 'Error while saving setting (' . $pluginName . ' - ' . $key . '): ' . $error->getMessage();
 			}
 		}
 
@@ -587,4 +595,8 @@ class Settings implements ArrayAccess
 
 		return true;
 	}
+
+	public function getErrors() {
+		return $this->errors;
+	}
 }

system/settings.php

@@ -1301,6 +1301,16 @@ Sent by MyAAC,<br/>
 			'desc' => 'What to give to player after donation - what column in accounts table to use.',
 			'options' => ['premium_points' => 'Premium Points', 'coins' => 'Coins'],
 			'default' => 'premium_points',
+			'callbacks' => [
+				'beforeSave' => function($key, $value, &$errorMessage) {
+					global $db;
+					if ($value == 'coins' && !$db->hasColumn('accounts', 'coins')) {
+						$errorMessage = "Shop: Donate Column: Cannot set column to coins, because it doesn't exist in database.";
+						return false;
+					}
+					return true;
+				}
+			]
 		],
 		'account_generate_new_reckey' => [
 			'name' => 'Allow Generate New Key',

system/templates/admin.settings.html.twig

@@ -80,11 +80,20 @@
 				Toastify({
 					position: 'center',
 					text: response,
-					duration: 3000
+					duration: 3000,
+					escapeMarkup: false,
 				}).showToast();
 			},
 			error : function(response) {
-				alert(response.responseText);
+				Toastify({
+					position: 'center',
+					text: response.responseText,
+					duration: 3000,
+					style: {
+						background: 'red',
+					},
+					escapeMarkup: false,
+				}).showToast();
 			}
 		});
 	});