a0490e3673
Also adds documentation to Debug.php! * Debug::isEnabled() Checks if the DEBUG file exists on disk on the first call (stored in memory for the duration of the instance). Returns true if debug mode is enabled for the client. This function also sets the internal flag for Debug::isSecure()! * Debug::isSecure() Returns true if debuging is enabled for specific IP addresses, false otherwise. This is checked on the first call of Debug::isEnabled(). If you call this function before Debug::isEnabled(), the default value is false.
97 lines
2.6 KiB
PHP
97 lines
2.6 KiB
PHP
<?php
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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 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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* Use Debug::isEnabled() instead of accessing this parameter directly!
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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 (not enabled for everyone).
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* Use Debug::isSecure() instead of accessing this parameter directly!
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*/
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private static $secure = false;
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/**
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* @return bool Indicates if debug mode is 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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$debug_whitelist = trim(file_get_contents(PATH_ROOT . 'DEBUG'));
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Debug::$enabled = empty($debug_whitelist) || in_array($_SERVER['REMOTE_ADDR'],
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explode("\n", str_replace("\r", '', $debug_whitelist)
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)
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);
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if(Debug::$enabled) {
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ini_set('display_errors', '1');
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error_reporting(E_ALL);
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Debug::$secure = !empty($debug_whitelist);
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}
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$firstCall = false; // Skip check on next call
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}
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return Debug::$enabled;
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}
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/**
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* Returns true if debug mode has been enabled for specific IP addresses
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* only, false otherwise.
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*
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* Notice: The security flag is set by Debug::isEnabled(). If this function
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* is called before Debug::isEnabled(), the default value is false!
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*
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* @return bool Indicates if debug mode is secure
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*/
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public static function isSecure() {
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return Debug::$secure;
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}
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/**
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* Adds a debug message to error_log if debug mode is enabled
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*/
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public static function log($text) {
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if(!Debug::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 = $backtrace[2];
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$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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