122 lines
3.1 KiB
PHP
122 lines
3.1 KiB
PHP
<?php
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/**
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* This file is part of RSS-Bridge, a PHP project capable of generating RSS and
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* Atom feeds for websites that don't have one.
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*
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* For the full license information, please view the UNLICENSE file distributed
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* with this source code.
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*
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* @package Core
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* @license http://unlicense.org/ UNLICENSE
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* @link https://github.com/rss-bridge/rss-bridge
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*/
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/**
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* Implements functions for debugging purposes. Debugging can be enabled by
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* placing a file named DEBUG in {@see PATH_ROOT}.
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*
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* The file specifies a whitelist of IP addresses on which debug mode will be
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* enabled. An empty file enables debug mode for everyone (highly discouraged
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* for public servers!). Each line in the file specifies one client in the
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* whitelist. For example:
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*
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* * `192.168.1.72`
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* * `127.0.0.1`
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* * `::1`
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*
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* Notice: If you are running RSS-Bridge on your local machine, you need to add
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* localhost (either `127.0.0.1` for IPv4 or `::1` for IPv6) to your whitelist!
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*
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* Warning: In debug mode your server may display sensitive information! For
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* security reasons it is recommended to whitelist only specific IP addresses.
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*/
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class Debug {
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/**
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* Indicates if debug mode is enabled.
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*
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* Do not access this property directly!
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* Use {@see Debug::isEnabled()} instead.
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*
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* @var bool
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*/
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private static $enabled = false;
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/**
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* Indicates if debug mode is secure.
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*
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* Do not access this property directly!
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* Use {@see Debug::isSecure()} instead.
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*
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* @var bool
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*/
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private static $secure = false;
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/**
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* Returns true if debug mode is enabled
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*
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* If debug mode is enabled, sets `display_errors = 1` and `error_reporting = E_ALL`
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*
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* @return bool True if enabled.
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*/
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public static function isEnabled() {
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static $firstCall = true; // Initialized on first call
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if($firstCall && file_exists(PATH_ROOT . 'DEBUG')) {
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$debug_whitelist = trim(file_get_contents(PATH_ROOT . 'DEBUG'));
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self::$enabled = empty($debug_whitelist) || in_array($_SERVER['REMOTE_ADDR'],
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explode("\n", str_replace("\r", '', $debug_whitelist)
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)
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);
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if(self::$enabled) {
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ini_set('display_errors', '1');
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error_reporting(E_ALL);
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self::$secure = !empty($debug_whitelist);
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}
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$firstCall = false; // Skip check on next call
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}
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return self::$enabled;
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}
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/**
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* Returns true if debug mode is enabled only for specific IP addresses.
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*
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* Notice: The security flag is set by {@see Debug::isEnabled()}. If this
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* function is called before {@see Debug::isEnabled()}, the default value is
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* false!
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*
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* @return bool True if debug mode is secure
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*/
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public static function isSecure() {
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return self::$secure;
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}
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/**
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* Adds a debug message to error_log if debug mode is enabled
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*
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* @param string $text The message to add to error_log
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*/
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public static function log($text) {
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if(!self::isEnabled()) {
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return;
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}
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$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
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$calling = end($backtrace);
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$message = $calling['file'] . ':'
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. $calling['line'] . ' class '
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. (isset($calling['class']) ? $calling['class'] : '<no-class>') . '->'
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. $calling['function'] . ' - '
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. $text;
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error_log($message);
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}
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}
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