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<?php |
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namespace HM\BackUpWordPress; |
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/** |
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* A set of Backup Utility functions |
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*/ |
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class Backup_Utilities { |
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/** |
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* Checks whether Safe Mode is currently on |
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* |
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* @param string $ini_get_callback By default we use `ini_get` to check for |
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* the Safe Mode setting but this can be |
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* overridden for testing purposes. |
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* |
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* @return boolean Whether Safe Mode is on or off. |
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*/ |
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public static function is_safe_mode_on( $ini_get_callback = 'ini_get' ) { |
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$safe_mode = @call_user_func( $ini_get_callback, 'safe_mode' ); |
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if ( $safe_mode && strtolower( $safe_mode ) !== 'off' ) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Check whether it's possible to use `exec`. |
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* |
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* @return boolean [description] |
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*/ |
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public static function is_exec_available() { |
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// You can't use exec if Safe Mode is on. |
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if ( self::is_safe_mode_on() ) { |
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return false; |
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} |
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// Check if exec is specifically disabled |
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if ( self::is_function_disabled( 'exec' ) ) { |
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return false; |
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} |
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// Some servers seem to disable escapeshellcmd / escapeshellarg separately to exec, in |
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// that instance we don't want to use exec as it's insecure |
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if ( self::is_function_disabled( 'escapeshellcmd' ) || self::is_function_disabled( 'escapeshellarg' ) ) { |
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return false; |
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} |
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// Can we issue a simple echo command? |
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exec( 'echo backupwordpress', $output, $return ); |
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if ( $return !== 0 ) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Check whether a PHP function has been disabled. |
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* |
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* @param string $function The function you want to test for. |
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* @param string $ini_get_callback By default we check with ini_get, but |
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* it's possible to overridde this for |
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* testing purposes. |
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* |
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* @return boolean Whether the function is disabled or not. |
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*/ |
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public static function is_function_disabled( $function, $ini_get_callback = 'ini_get' ) { |
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// Suhosin stores it's disabled functions in `suhosin.executor.func.blacklist` |
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$suhosin_blacklist = array_map( 'trim', explode( ',', @call_user_func( $ini_get_callback, 'suhosin.executor.func.blacklist' ) ) ); |
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// PHP supports disabling functions by adding them to `disable_functions` in php.ini. |
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$disabled_functions = array_map( 'trim', explode( ',', @call_user_func( $ini_get_callback, 'disable_functions' ) ) ); |
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if ( in_array( $function, array_merge( $suhosin_blacklist, $disabled_functions ) ) ) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Attempt to work out path to a cli executable. |
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* |
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* @param array $paths An array of paths to check against. |
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* |
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* @return string|false The path to the executable. |
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*/ |
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public static function get_executable_path( $paths ) { |
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if ( ! self::is_exec_available() ) { |
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return false; |
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} |
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$paths = array_map( 'wp_normalize_path', $paths ); |
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foreach ( $paths as $path ) { |
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$output = $result = 0; |
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/** |
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* Attempt to call `--version` on each path, the one which works |
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* must be the correct path. |
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* |
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* We pipe STDERR to /dev/null so we don't leak errors. |
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*/ |
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exec( escapeshellarg( $path ) . ' --version ' . ignore_stderr(), $output, $result ); |
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// If the command executed successfully then this must be the correct path |
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if ( $result === 0 ) { |
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return $path; |
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} |
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} |
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return false; |
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} |
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} |
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humanmade /
backupwordpress
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