GeneralUtility.php 235 KB
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<?php
namespace TYPO3\CMS\Core\Utility;

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/*
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 * This file is part of the TYPO3 CMS project.
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 *
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 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
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 *
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 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
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 *
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 * The TYPO3 project - inspiring people to share!
 */
Wouter Wolters's avatar
Wouter Wolters committed
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use TYPO3\CMS\Core\Core\ApplicationContext;
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use TYPO3\CMS\Core\Core\ClassLoadingInformation;
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use TYPO3\CMS\Core\Imaging\GraphicalFunctions;
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use TYPO3\CMS\Core\Service\OpcodeCacheService;
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use TYPO3\CMS\Core\SingletonInterface;
use TYPO3\CMS\Frontend\Page\PageRepository;
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/**
 * The legendary "t3lib_div" class - Miscellaneous functions for general purpose.
 * Most of the functions do not relate specifically to TYPO3
 * However a section of functions requires certain TYPO3 features available
 * See comments in the source.
 * You are encouraged to use this library in your own scripts!
 *
 * USE:
 * The class is intended to be used without creating an instance of it.
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 * So: Don't instantiate - call functions with "\TYPO3\CMS\Core\Utility\GeneralUtility::" prefixed the function name.
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 * So use \TYPO3\CMS\Core\Utility\GeneralUtility::[method-name] to refer to the functions, eg. '\TYPO3\CMS\Core\Utility\GeneralUtility::milliseconds()'
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 */
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class GeneralUtility
{
    // Severity constants used by \TYPO3\CMS\Core\Utility\GeneralUtility::sysLog()
    const SYSLOG_SEVERITY_INFO = 0;
    const SYSLOG_SEVERITY_NOTICE = 1;
    const SYSLOG_SEVERITY_WARNING = 2;
    const SYSLOG_SEVERITY_ERROR = 3;
    const SYSLOG_SEVERITY_FATAL = 4;

    const ENV_TRUSTED_HOSTS_PATTERN_ALLOW_ALL = '.*';
    const ENV_TRUSTED_HOSTS_PATTERN_SERVER_NAME = 'SERVER_NAME';

    /**
     * State of host header value security check
     * in order to avoid unnecessary multiple checks during one request
     *
     * @var bool
     */
    protected static $allowHostHeaderValue = false;

    /**
     * Singleton instances returned by makeInstance, using the class names as
     * array keys
     *
     * @var array<\TYPO3\CMS\Core\SingletonInterface>
     */
    protected static $singletonInstances = array();

    /**
     * Instances returned by makeInstance, using the class names as array keys
     *
     * @var array<array><object>
     */
    protected static $nonSingletonInstances = array();

    /**
     * Cache for makeInstance with given class name and final class names to reduce number of self::getClassName() calls
     *
     * @var array Given class name => final class name
     */
    protected static $finalClassNameCache = array();

    /**
     * The application context
     *
     * @var \TYPO3\CMS\Core\Core\ApplicationContext
     */
    protected static $applicationContext = null;

    /**
     * IDNA string cache
     *
     * @var array<string>
     */
    protected static $idnaStringCache = array();

    /**
     * IDNA converter
     *
     * @var \idna_convert
     */
    protected static $idnaConverter = null;

    /**
     * A list of supported CGI server APIs
     * NOTICE: This is a duplicate of the SAME array in SystemEnvironmentBuilder
     * @var array
     */
    protected static $supportedCgiServerApis = array(
        'fpm-fcgi',
        'cgi',
        'isapi',
        'cgi-fcgi',
        'srv', // HHVM with fastcgi
    );

    /**
     * @var array
     */
    protected static $indpEnvCache = [];

    /*************************
     *
     * GET/POST Variables
     *
     * Background:
     * Input GET/POST variables in PHP may have their quotes escaped with "\" or not depending on configuration.
     * TYPO3 has always converted quotes to BE escaped if the configuration told that they would not be so.
     * But the clean solution is that quotes are never escaped and that is what the functions below offers.
     * Eventually TYPO3 should provide this in the global space as well.
     * In the transitional phase (or forever..?) we need to encourage EVERY to read and write GET/POST vars through the API functions below.
     * This functionality was previously needed to normalize between magic quotes logic, which was removed from PHP 5.4,
     * so these methods are still in use, but not tackle the slash problem anymore.
     *
     *************************/
    /**
     * Returns the 'GLOBAL' value of incoming data from POST or GET, with priority to POST (that is equalent to 'GP' order)
     * To enhance security in your scripts, please consider using GeneralUtility::_GET or GeneralUtility::_POST if you already
     * know by which method your data is arriving to the scripts!
     *
     * @param string $var GET/POST var to return
     * @return mixed POST var named $var and if not set, the GET var of the same name.
     */
    public static function _GP($var)
    {
        if (empty($var)) {
            return;
        }
        $value = isset($_POST[$var]) ? $_POST[$var] : $_GET[$var];
        // This is there for backwards-compatibility, in order to avoid NULL
        if (isset($value) && !is_array($value)) {
            $value = (string)$value;
        }
        return $value;
    }

    /**
     * Returns the global arrays $_GET and $_POST merged with $_POST taking precedence.
     *
     * @param string $parameter Key (variable name) from GET or POST vars
     * @return array Returns the GET vars merged recursively onto the POST vars.
     */
    public static function _GPmerged($parameter)
    {
        $postParameter = isset($_POST[$parameter]) && is_array($_POST[$parameter]) ? $_POST[$parameter] : array();
        $getParameter = isset($_GET[$parameter]) && is_array($_GET[$parameter]) ? $_GET[$parameter] : array();
        $mergedParameters = $getParameter;
        ArrayUtility::mergeRecursiveWithOverrule($mergedParameters, $postParameter);
        return $mergedParameters;
    }

    /**
     * Returns the global $_GET array (or value from) normalized to contain un-escaped values.
     * ALWAYS use this API function to acquire the GET variables!
     * This function was previously used to normalize between magic quotes logic, which was removed from PHP 5.5
     *
     * @param string $var Optional pointer to value in GET array (basically name of GET var)
     * @return mixed If $var is set it returns the value of $_GET[$var]. If $var is NULL (default), returns $_GET itself. In any case *slashes are stipped from the output!*
     * @see _POST(), _GP(), _GETset()
     */
    public static function _GET($var = null)
    {
        $value = $var === null ? $_GET : (empty($var) ? null : $_GET[$var]);
        // This is there for backwards-compatibility, in order to avoid NULL
        if (isset($value) && !is_array($value)) {
            $value = (string)$value;
        }
        return $value;
    }

    /**
     * Returns the global $_POST array (or value from) normalized to contain un-escaped values.
     * ALWAYS use this API function to acquire the $_POST variables!
     *
     * @param string $var Optional pointer to value in POST array (basically name of POST var)
     * @return mixed If $var is set it returns the value of $_POST[$var]. If $var is NULL (default), returns $_POST itself. In any case *slashes are stipped from the output!*
     * @see _GET(), _GP()
     */
    public static function _POST($var = null)
    {
        $value = $var === null ? $_POST : (empty($var) ? null : $_POST[$var]);
        // This is there for backwards-compatibility, in order to avoid NULL
        if (isset($value) && !is_array($value)) {
            $value = (string)$value;
        }
        return $value;
    }

    /**
     * Writes input value to $_GET.
     *
     * @param mixed $inputGet
     * @param string $key
     * @return void
     */
    public static function _GETset($inputGet, $key = '')
    {
        if ($key != '') {
            if (strpos($key, '|') !== false) {
                $pieces = explode('|', $key);
                $newGet = array();
                $pointer = &$newGet;
                foreach ($pieces as $piece) {
                    $pointer = &$pointer[$piece];
                }
                $pointer = $inputGet;
                $mergedGet = $_GET;
                ArrayUtility::mergeRecursiveWithOverrule($mergedGet, $newGet);
                $_GET = $mergedGet;
                $GLOBALS['HTTP_GET_VARS'] = $mergedGet;
            } else {
                $_GET[$key] = $inputGet;
                $GLOBALS['HTTP_GET_VARS'][$key] = $inputGet;
            }
        } elseif (is_array($inputGet)) {
            $_GET = $inputGet;
            $GLOBALS['HTTP_GET_VARS'] = $inputGet;
        }
    }

    /**
     * Wrapper for the RemoveXSS function.
     * Removes potential XSS code from an input string.
     *
     * Using an external class by Travis Puderbaugh <kallahar@quickwired.com>
     *
     * @param string $string Input string
     * @return string Input string with potential XSS code removed
     */
    public static function removeXSS($string)
    {
        return \RemoveXSS::process($string);
    }

    /*************************
     *
     * IMAGE FUNCTIONS
     *
     *************************/
    /**
     * Compressing a GIF file if not already LZW compressed.
     * This function is a workaround for the fact that ImageMagick and/or GD does not compress GIF-files to their minimun size (that is RLE or no compression used)
     *
     * The function takes a file-reference, $theFile, and saves it again through GD or ImageMagick in order to compress the file
     * GIF:
     * If $type is not set, the compression is done with ImageMagick (provided that $GLOBALS['TYPO3_CONF_VARS']['GFX']['im_path_lzw'] is pointing to the path of a lzw-enabled version of 'convert') else with GD (should be RLE-enabled!)
     * If $type is set to either 'IM' or 'GD' the compression is done with ImageMagick and GD respectively
     * PNG:
     * No changes.
     *
     * $theFile is expected to be a valid GIF-file!
     * The function returns a code for the operation.
     *
     * @param string $theFile Filepath
     * @param string $type See description of function
     * @return string Returns "GD" if GD was used, otherwise "IM" if ImageMagick was used. If nothing done at all, it returns empty string.
     * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8. Use \TYPO3\CMS\Core\Imaging\GraphicalFunctions::gifCompress() instead.
     */
    public static function gif_compress($theFile, $type)
    {
        static::logDeprecatedFunction();
        $returnCode = GraphicalFunctions::gifCompress($theFile, $type);
        return $returnCode;
    }

    /**
     * Converts a png file to gif.
     * This converts a png file to gif IF the FLAG $GLOBALS['TYPO3_CONF_VARS']['FE']['png_to_gif'] is set TRUE.
     *
     * @param string $theFile The filename with path
     * @return string New filename
     * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8. Use \TYPO3\CMS\Core\Imaging\GraphicalFunctions::pngToGifByImagemagick() instead.
     */
    public static function png_to_gif_by_imagemagick($theFile)
    {
        static::logDeprecatedFunction();
        $newFile = GraphicalFunctions::pngToGifByImagemagick($theFile);
        return $newFile;
    }

    /**
     * Returns filename of the png/gif version of the input file (which can be png or gif).
     * If input file type does not match the wanted output type a conversion is made and temp-filename returned.
     *
     * @param string $theFile Filepath of image file
     * @param bool $output_png If set, then input file is converted to PNG, otherwise to GIF
     * @return string If the new image file exists, its filepath is returned
     * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8. Use \TYPO3\CMS\Core\Imaging\GraphicalFunctions::readPngGif() instead.
     */
    public static function read_png_gif($theFile, $output_png = false)
    {
        static::logDeprecatedFunction();
        $newFile = GraphicalFunctions::readPngGif($theFile, $output_png);
        return $newFile;
    }

    /*************************
     *
     * STRING FUNCTIONS
     *
     *************************/
    /**
     * Truncates a string with appended/prepended "..." and takes current character set into consideration.
     *
     * @param string $string String to truncate
     * @param int $chars Must be an integer with an absolute value of at least 4. if negative the string is cropped from the right end.
     * @param string $appendString Appendix to the truncated string
     * @return string Cropped string
     */
    public static function fixed_lgd_cs($string, $chars, $appendString = '...')
    {
        if (is_object($GLOBALS['LANG'])) {
            return $GLOBALS['LANG']->csConvObj->crop($GLOBALS['LANG']->charSet, $string, $chars, $appendString);
        } elseif (is_object($GLOBALS['TSFE']) && is_object($GLOBALS['TSFE']->csConvObj)) {
            $charSet = $GLOBALS['TSFE']->renderCharset != '' ? $GLOBALS['TSFE']->renderCharset : $GLOBALS['TSFE']->defaultCharSet;
            return $GLOBALS['TSFE']->csConvObj->crop($charSet, $string, $chars, $appendString);
        } else {
            // This case should not happen
            $csConvObj = self::makeInstance(\TYPO3\CMS\Core\Charset\CharsetConverter::class);
            return $csConvObj->crop('utf-8', $string, $chars, $appendString);
        }
    }

    /**
     * Match IP number with list of numbers with wildcard
     * Dispatcher method for switching into specialised IPv4 and IPv6 methods.
     *
     * @param string $baseIP Is the current remote IP address for instance, typ. REMOTE_ADDR
     * @param string $list Is a comma-list of IP-addresses to match with. *-wildcard allowed instead of number, plus leaving out parts in the IP number is accepted as wildcard (eg. 192.168.*.* equals 192.168). If list is "*" no check is done and the function returns TRUE immediately. An empty list always returns FALSE.
     * @return bool TRUE if an IP-mask from $list matches $baseIP
     */
    public static function cmpIP($baseIP, $list)
    {
        $list = trim($list);
        if ($list === '') {
            return false;
        } elseif ($list === '*') {
            return true;
        }
        if (strpos($baseIP, ':') !== false && self::validIPv6($baseIP)) {
            return self::cmpIPv6($baseIP, $list);
        } else {
            return self::cmpIPv4($baseIP, $list);
        }
    }

    /**
     * Match IPv4 number with list of numbers with wildcard
     *
     * @param string $baseIP Is the current remote IP address for instance, typ. REMOTE_ADDR
     * @param string $list Is a comma-list of IP-addresses to match with. *-wildcard allowed instead of number, plus leaving out parts in the IP number is accepted as wildcard (eg. 192.168.*.* equals 192.168), could also contain IPv6 addresses
     * @return bool TRUE if an IP-mask from $list matches $baseIP
     */
    public static function cmpIPv4($baseIP, $list)
    {
        $IPpartsReq = explode('.', $baseIP);
        if (count($IPpartsReq) === 4) {
            $values = self::trimExplode(',', $list, true);
            foreach ($values as $test) {
                $testList = explode('/', $test);
                if (count($testList) === 2) {
                    list($test, $mask) = $testList;
                } else {
                    $mask = false;
                }
                if ((int)$mask) {
                    // "192.168.3.0/24"
                    $lnet = ip2long($test);
                    $lip = ip2long($baseIP);
                    $binnet = str_pad(decbin($lnet), 32, '0', STR_PAD_LEFT);
                    $firstpart = substr($binnet, 0, $mask);
                    $binip = str_pad(decbin($lip), 32, '0', STR_PAD_LEFT);
                    $firstip = substr($binip, 0, $mask);
                    $yes = $firstpart === $firstip;
                } else {
                    // "192.168.*.*"
                    $IPparts = explode('.', $test);
                    $yes = 1;
                    foreach ($IPparts as $index => $val) {
                        $val = trim($val);
                        if ($val !== '*' && $IPpartsReq[$index] !== $val) {
                            $yes = 0;
                        }
                    }
                }
                if ($yes) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * Match IPv6 address with a list of IPv6 prefixes
     *
     * @param string $baseIP Is the current remote IP address for instance
     * @param string $list Is a comma-list of IPv6 prefixes, could also contain IPv4 addresses
     * @return bool TRUE If an baseIP matches any prefix
     */
    public static function cmpIPv6($baseIP, $list)
    {
        // Policy default: Deny connection
        $success = false;
        $baseIP = self::normalizeIPv6($baseIP);
        $values = self::trimExplode(',', $list, true);
        foreach ($values as $test) {
            $testList = explode('/', $test);
            if (count($testList) === 2) {
                list($test, $mask) = $testList;
            } else {
                $mask = false;
            }
            if (self::validIPv6($test)) {
                $test = self::normalizeIPv6($test);
                $maskInt = (int)$mask ?: 128;
                // Special case; /0 is an allowed mask - equals a wildcard
                if ($mask === '0') {
                    $success = true;
                } elseif ($maskInt == 128) {
                    $success = $test === $baseIP;
                } else {
                    $testBin = self::IPv6Hex2Bin($test);
                    $baseIPBin = self::IPv6Hex2Bin($baseIP);
                    $success = true;
                    // Modulo is 0 if this is a 8-bit-boundary
                    $maskIntModulo = $maskInt % 8;
                    $numFullCharactersUntilBoundary = (int)($maskInt / 8);
                    if (substr($testBin, 0, $numFullCharactersUntilBoundary) !== substr($baseIPBin, 0, $numFullCharactersUntilBoundary)) {
                        $success = false;
                    } elseif ($maskIntModulo > 0) {
                        // If not an 8-bit-boundary, check bits of last character
                        $testLastBits = str_pad(decbin(ord(substr($testBin, $numFullCharactersUntilBoundary, 1))), 8, '0', STR_PAD_LEFT);
                        $baseIPLastBits = str_pad(decbin(ord(substr($baseIPBin, $numFullCharactersUntilBoundary, 1))), 8, '0', STR_PAD_LEFT);
                        if (strncmp($testLastBits, $baseIPLastBits, $maskIntModulo) != 0) {
                            $success = false;
                        }
                    }
                }
            }
            if ($success) {
                return true;
            }
        }
        return false;
    }

    /**
     * Transform a regular IPv6 address from hex-representation into binary
     *
     * @param string $hex IPv6 address in hex-presentation
     * @return string Binary representation (16 characters, 128 characters)
     * @see IPv6Bin2Hex()
     */
    public static function IPv6Hex2Bin($hex)
    {
        return inet_pton($hex);
    }

    /**
     * Transform an IPv6 address from binary to hex-representation
     *
     * @param string $bin IPv6 address in hex-presentation
     * @return string Binary representation (16 characters, 128 characters)
     * @see IPv6Hex2Bin()
     */
    public static function IPv6Bin2Hex($bin)
    {
        return inet_ntop($bin);
    }

    /**
     * Normalize an IPv6 address to full length
     *
     * @param string $address Given IPv6 address
     * @return string Normalized address
     * @see compressIPv6()
     */
    public static function normalizeIPv6($address)
    {
        $normalizedAddress = '';
        $stageOneAddress = '';
        // According to RFC lowercase-representation is recommended
        $address = strtolower($address);
        // Normalized representation has 39 characters (0000:0000:0000:0000:0000:0000:0000:0000)
        if (strlen($address) == 39) {
            // Already in full expanded form
            return $address;
        }
        // Count 2 if if address has hidden zero blocks
        $chunks = explode('::', $address);
        if (count($chunks) === 2) {
            $chunksLeft = explode(':', $chunks[0]);
            $chunksRight = explode(':', $chunks[1]);
            $left = count($chunksLeft);
            $right = count($chunksRight);
            // Special case: leading zero-only blocks count to 1, should be 0
            if ($left == 1 && strlen($chunksLeft[0]) == 0) {
                $left = 0;
            }
            $hiddenBlocks = 8 - ($left + $right);
            $hiddenPart = '';
            $h = 0;
            while ($h < $hiddenBlocks) {
                $hiddenPart .= '0000:';
                $h++;
            }
            if ($left == 0) {
                $stageOneAddress = $hiddenPart . $chunks[1];
            } else {
                $stageOneAddress = $chunks[0] . ':' . $hiddenPart . $chunks[1];
            }
        } else {
            $stageOneAddress = $address;
        }
        // Normalize the blocks:
        $blocks = explode(':', $stageOneAddress);
        $divCounter = 0;
        foreach ($blocks as $block) {
            $tmpBlock = '';
            $i = 0;
            $hiddenZeros = 4 - strlen($block);
            while ($i < $hiddenZeros) {
                $tmpBlock .= '0';
                $i++;
            }
            $normalizedAddress .= $tmpBlock . $block;
            if ($divCounter < 7) {
                $normalizedAddress .= ':';
                $divCounter++;
            }
        }
        return $normalizedAddress;
    }

    /**
     * Compress an IPv6 address to the shortest notation
     *
     * @param string $address Given IPv6 address
     * @return string Compressed address
     * @see normalizeIPv6()
     */
    public static function compressIPv6($address)
    {
        return inet_ntop(inet_pton($address));
    }

    /**
     * Validate a given IP address.
     *
     * Possible format are IPv4 and IPv6.
     *
     * @param string $ip IP address to be tested
     * @return bool TRUE if $ip is either of IPv4 or IPv6 format.
     */
    public static function validIP($ip)
    {
        return filter_var($ip, FILTER_VALIDATE_IP) !== false;
    }

    /**
     * Validate a given IP address to the IPv4 address format.
     *
     * Example for possible format: 10.0.45.99
     *
     * @param string $ip IP address to be tested
     * @return bool TRUE if $ip is of IPv4 format.
     */
    public static function validIPv4($ip)
    {
        return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false;
    }

    /**
     * Validate a given IP address to the IPv6 address format.
     *
     * Example for possible format: 43FB::BB3F:A0A0:0 | ::1
     *
     * @param string $ip IP address to be tested
     * @return bool TRUE if $ip is of IPv6 format.
     */
    public static function validIPv6($ip)
    {
        return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;
    }

    /**
     * Match fully qualified domain name with list of strings with wildcard
     *
     * @param string $baseHost A hostname or an IPv4/IPv6-address (will by reverse-resolved; typically REMOTE_ADDR)
     * @param string $list A comma-list of domain names to match with. *-wildcard allowed but cannot be part of a string, so it must match the full host name (eg. myhost.*.com => correct, myhost.*domain.com => wrong)
     * @return bool TRUE if a domain name mask from $list matches $baseIP
     */
    public static function cmpFQDN($baseHost, $list)
    {
        $baseHost = trim($baseHost);
        if (empty($baseHost)) {
            return false;
        }
        if (self::validIPv4($baseHost) || self::validIPv6($baseHost)) {
            // Resolve hostname
            // Note: this is reverse-lookup and can be randomly set as soon as somebody is able to set
            // the reverse-DNS for his IP (security when for example used with REMOTE_ADDR)
            $baseHostName = gethostbyaddr($baseHost);
            if ($baseHostName === $baseHost) {
                // Unable to resolve hostname
                return false;
            }
        } else {
            $baseHostName = $baseHost;
        }
        $baseHostNameParts = explode('.', $baseHostName);
        $values = self::trimExplode(',', $list, true);
        foreach ($values as $test) {
            $hostNameParts = explode('.', $test);
            // To match hostNameParts can only be shorter (in case of wildcards) or equal
            $hostNamePartsCount = count($hostNameParts);
            $baseHostNamePartsCount = count($baseHostNameParts);
            if ($hostNamePartsCount > $baseHostNamePartsCount) {
                continue;
            }
            $yes = true;
            foreach ($hostNameParts as $index => $val) {
                $val = trim($val);
                if ($val === '*') {
                    // Wildcard valid for one or more hostname-parts
                    $wildcardStart = $index + 1;
                    // Wildcard as last/only part always matches, otherwise perform recursive checks
                    if ($wildcardStart < $hostNamePartsCount) {
                        $wildcardMatched = false;
                        $tempHostName = implode('.', array_slice($hostNameParts, $index + 1));
                        while ($wildcardStart < $baseHostNamePartsCount && !$wildcardMatched) {
                            $tempBaseHostName = implode('.', array_slice($baseHostNameParts, $wildcardStart));
                            $wildcardMatched = self::cmpFQDN($tempBaseHostName, $tempHostName);
                            $wildcardStart++;
                        }
                        if ($wildcardMatched) {
                            // Match found by recursive compare
                            return true;
                        } else {
                            $yes = false;
                        }
                    }
                } elseif ($baseHostNameParts[$index] !== $val) {
                    // In case of no match
                    $yes = false;
                }
            }
            if ($yes) {
                return true;
            }
        }
        return false;
    }

    /**
     * Checks if a given URL matches the host that currently handles this HTTP request.
     * Scheme, hostname and (optional) port of the given URL are compared.
     *
     * @param string $url URL to compare with the TYPO3 request host
     * @return bool Whether the URL matches the TYPO3 request host
     */
    public static function isOnCurrentHost($url)
    {
        return stripos($url . '/', self::getIndpEnv('TYPO3_REQUEST_HOST') . '/') === 0;
    }

    /**
     * Check for item in list
     * Check if an item exists in a comma-separated list of items.
     *
     * @param string $list Comma-separated list of items (string)
     * @param string $item Item to check for
     * @return bool TRUE if $item is in $list
     */
    public static function inList($list, $item)
    {
        return strpos(',' . $list . ',', ',' . $item . ',') !== false;
    }

    /**
     * Removes an item from a comma-separated list of items.
     *
     * If $element contains a comma, the behaviour of this method is undefined.
     * Empty elements in the list are preserved.
     *
     * @param string $element Element to remove
     * @param string $list Comma-separated list of items (string)
     * @return string New comma-separated list of items
     */
    public static function rmFromList($element, $list)
    {
        $items = explode(',', $list);
        foreach ($items as $k => $v) {
            if ($v == $element) {
                unset($items[$k]);
            }
        }
        return implode(',', $items);
    }

    /**
     * Expand a comma-separated list of integers with ranges (eg 1,3-5,7 becomes 1,3,4,5,7).
     * Ranges are limited to 1000 values per range.
     *
     * @param string $list Comma-separated list of integers with ranges (string)
     * @return string New comma-separated list of items
     */
    public static function expandList($list)
    {
        $items = explode(',', $list);
        $list = array();
        foreach ($items as $item) {
            $range = explode('-', $item);
            if (isset($range[1])) {
                $runAwayBrake = 1000;
                for ($n = $range[0]; $n <= $range[1]; $n++) {
                    $list[] = $n;
                    $runAwayBrake--;
                    if ($runAwayBrake <= 0) {
                        break;
                    }
                }
            } else {
                $list[] = $item;
            }
        }
        return implode(',', $list);
    }

    /**
     * Returns TRUE if the current TYPO3 version (or compatibility version) is compatible to the input version
     * Notice that this function compares branches, not versions (4.0.1 would be > 4.0.0 although they use the same compat_version)
     *
     * @param string $verNumberStr Minimum branch number required (format x.y / e.g. "4.0" NOT "4.0.0"!)
     * @return bool Returns TRUE if this setup is compatible with the provided version number
     * @todo Still needs a function to convert versions to branches
     */
    public static function compat_version($verNumberStr)
    {
        return VersionNumberUtility::convertVersionNumberToInteger(TYPO3_branch) >= VersionNumberUtility::convertVersionNumberToInteger($verNumberStr);
    }

    /**
     * Makes a positive integer hash out of the first 7 chars from the md5 hash of the input
     *
     * @param string $str String to md5-hash
     * @return int Returns 28bit integer-hash
     */
    public static function md5int($str)
    {
        return hexdec(substr(md5($str), 0, 7));
    }

    /**
     * Returns the first 10 positions of the MD5-hash		(changed from 6 to 10 recently)
     *
     * @param string $input Input string to be md5-hashed
     * @param int $len The string-length of the output
     * @return string Substring of the resulting md5-hash, being $len chars long (from beginning)
     */
    public static function shortMD5($input, $len = 10)
    {
        return substr(md5($input), 0, $len);
    }

    /**
     * Returns a proper HMAC on a given input string and secret TYPO3 encryption key.
     *
     * @param string $input Input string to create HMAC from
     * @param string $additionalSecret additionalSecret to prevent hmac beeing used in a different context
     * @return string resulting (hexadecimal) HMAC currently with a length of 40 (HMAC-SHA-1)
     */
    public static function hmac($input, $additionalSecret = '')
    {
        $hashAlgorithm = 'sha1';
        $hashBlocksize = 64;
        $hmac = '';
        $secret = $GLOBALS['TYPO3_CONF_VARS']['SYS']['encryptionKey'] . $additionalSecret;
        if (extension_loaded('hash') && function_exists('hash_hmac') && function_exists('hash_algos') && in_array($hashAlgorithm, hash_algos())) {
            $hmac = hash_hmac($hashAlgorithm, $input, $secret);
        } else {
            // Outer padding
            $opad = str_repeat(chr(92), $hashBlocksize);
            // Inner padding
            $ipad = str_repeat(chr(54), $hashBlocksize);
            if (strlen($secret) > $hashBlocksize) {
                // Keys longer than block size are shorten
                $key = str_pad(pack('H*', call_user_func($hashAlgorithm, $secret)), $hashBlocksize, chr(0));
            } else {
                // Keys shorter than block size are zero-padded
                $key = str_pad($secret, $hashBlocksize, chr(0));
            }
            $hmac = call_user_func($hashAlgorithm, ($key ^ $opad) . pack('H*', call_user_func($hashAlgorithm, (($key ^ $ipad) . $input))));
        }
        return $hmac;
    }

    /**
     * Takes comma-separated lists and arrays and removes all duplicates
     * If a value in the list is trim(empty), the value is ignored.
     *
     * @param string $in_list Accept multiple parameters which can be comma-separated lists of values and arrays.
     * @param mixed $secondParameter Dummy field, which if set will show a warning!
     * @return string Returns the list without any duplicates of values, space around values are trimmed
     */
    public static function uniqueList($in_list, $secondParameter = null)
    {
        if (is_array($in_list)) {
            throw new \InvalidArgumentException('TYPO3 Fatal Error: TYPO3\\CMS\\Core\\Utility\\GeneralUtility::uniqueList() does NOT support array arguments anymore! Only string comma lists!', 1270853885);
        }
        if (isset($secondParameter)) {
            throw new \InvalidArgumentException('TYPO3 Fatal Error: TYPO3\\CMS\\Core\\Utility\\GeneralUtility::uniqueList() does NOT support more than a single argument value anymore. You have specified more than one!', 1270853886);
        }
        return implode(',', array_unique(self::trimExplode(',', $in_list, true)));
    }

    /**
     * Splits a reference to a file in 5 parts
     *
     * @param string $fileNameWithPath File name with path to be analysed (must exist if open_basedir is set)
     * @return array Contains keys [path], [file], [filebody], [fileext], [realFileext]
     */
    public static function split_fileref($fileNameWithPath)
    {
        $reg = array();
        if (preg_match('/(.*\\/)(.*)$/', $fileNameWithPath, $reg)) {
            $info['path'] = $reg[1];
            $info['file'] = $reg[2];
        } else {
            $info['path'] = '';
            $info['file'] = $fileNameWithPath;
        }
        $reg = '';
        // If open_basedir is set and the fileName was supplied without a path the is_dir check fails
        if (!is_dir($fileNameWithPath) && preg_match('/(.*)\\.([^\\.]*$)/', $info['file'], $reg)) {
            $info['filebody'] = $reg[1];
            $info['fileext'] = strtolower($reg[2]);
            $info['realFileext'] = $reg[2];
        } else {
            $info['filebody'] = $info['file'];
            $info['fileext'] = '';
        }
        reset($info);
        return $info;
    }

    /**
     * Returns the directory part of a path without trailing slash
     * If there is no dir-part, then an empty string is returned.
     * Behaviour:
     *
     * '/dir1/dir2/script.php' => '/dir1/dir2'
     * '/dir1/' => '/dir1'
     * 'dir1/script.php' => 'dir1'
     * 'd/script.php' => 'd'
     * '/script.php' => ''
     * '' => ''
     *
     * @param string $path Directory name / path
     * @return string Processed input value. See function description.
     */
    public static function dirname($path)
    {
        $p = self::revExplode('/', $path, 2);
        return count($p) === 2 ? $p[0] : '';
    }

    /**
     * Modifies a HTML Hex color by adding/subtracting $R,$G and $B integers
     *
     * @param string $color A hexadecimal color code, #xxxxxx
     * @param int $R Offset value 0-255
     * @param int $G Offset value 0-255
     * @param int $B Offset value 0-255
     * @return string A hexadecimal color code, #xxxxxx, modified according to input vars
     * @see modifyHTMLColorAll()
     * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8
     */
    public static function modifyHTMLColor($color, $R, $G, $B)
    {
        self::logDeprecatedFunction();
        // This takes a hex-color (# included!) and adds $R, $G and $B to the HTML-color (format: #xxxxxx) and returns the new color
        $nR = MathUtility::forceIntegerInRange(hexdec(substr($color, 1, 2)) + $R, 0, 255);
        $nG = MathUtility::forceIntegerInRange(hexdec(substr($color, 3, 2)) + $G, 0, 255);
        $nB = MathUtility::forceIntegerInRange(hexdec(substr($color, 5, 2)) + $B, 0, 255);
        return '#' . substr(('0' . dechex($nR)), -2) . substr(('0' . dechex($nG)), -2) . substr(('0' . dechex($nB)), -2);
    }

    /**
     * Modifies a HTML Hex color by adding/subtracting $all integer from all R/G/B channels
     *
     * @param string $color A hexadecimal color code, #xxxxxx
     * @param int $all Offset value 0-255 for all three channels.
     * @return string A hexadecimal color code, #xxxxxx, modified according to input vars
     * @see modifyHTMLColor()
     * @deprecated since TYPO3 CMS 7, will be removed in TYPO3 CMS 8
     */
    public static function modifyHTMLColorAll($color, $all)
    {
        self::logDeprecatedFunction();
        return self::modifyHTMLColor($color, $all, $all, $all);
    }

    /**
     * Returns TRUE if the first part of $str matches the string $partStr
     *
     * @param string $str Full string to check
     * @param string $partStr Reference string which must be found as the "first part" of the full string
     * @return bool TRUE if $partStr was found to be equal to the first part of $str
     */
    public static function isFirstPartOfStr($str, $partStr)
    {
        return $partStr != '' && strpos((string)$str, (string)$partStr, 0) === 0;
    }

    /**
     * Formats the input integer $sizeInBytes as bytes/kilobytes/megabytes (-/K/M)
     *
     * @param int $sizeInBytes Number of bytes to format.
     * @param string $labels Binary unit name "iec", decimal unit name "si" or labels for bytes, kilo, mega, giga, and so on separated by vertical bar (|) and possibly encapsulated in "". Eg: " | K| M| G". Defaults to "iec".
     * @param int $base The unit base if not using a unit name. Defaults to 1024.
     * @return string Formatted representation of the byte number, for output.
     */
    public static function formatSize($sizeInBytes, $labels = '', $base = 0)
    {
        $defaultFormats = array(
            'iec' => array('base' => 1024, 'labels' => array(' ', ' Ki', ' Mi', ' Gi', ' Ti', ' Pi', ' Ei', ' Zi', ' Yi')),
            'si' => array('base' => 1000, 'labels' => array(' ', ' k', ' M', ' G', ' T', ' P', ' E', ' Z', ' Y')),
        );
        // Set labels and base:
        if (empty($labels)) {
            $labels = 'iec';
        }
        if (isset($defaultFormats[$labels])) {
            $base = $defaultFormats[$labels]['base'];
            $labelArr = $defaultFormats[$labels]['labels'];
        } else {
            $base = (int)$base;
            if ($base !== 1000 && $base !== 1024) {
                $base = 1024;
            }
            $labelArr = explode('|', str_replace('"', '', $labels));
        }
        // @todo find out which locale is used for current BE user to cover the BE case as well
        $oldLocale = setlocale(LC_NUMERIC, 0);
        $newLocale = is_object($GLOBALS['TSFE']) ? $GLOBALS['TSFE']->config['config']['locale_all'] : '';
        if ($newLocale) {
            setlocale(LC_NUMERIC, $newLocale);
        }
        $localeInfo = localeconv();
        if ($newLocale) {
            setlocale(LC_NUMERIC, $oldLocale);
        }
        $sizeInBytes = max($sizeInBytes, 0);
        $multiplier = floor(($sizeInBytes ? log($sizeInBytes) : 0) / log($base));
        $sizeInUnits = $sizeInBytes / pow($base, $multiplier);
        if ($sizeInUnits > ($base * .9)) {
            $multiplier++;
        }
        $multiplier = min($multiplier, count($labelArr) - 1);
        $sizeInUnits = $sizeInBytes / pow($base, $multiplier);
        return number_format($sizeInUnits, (($multiplier > 0) && ($sizeInUnits < 20)) ? 2 : 0, $localeInfo['decimal_point'], '') . $labelArr[$multiplier];
    }

    /**
     * Returns microtime input to milliseconds
     *
     * @param string $microtime Microtime
     * @return int Microtime input string converted to an integer (milliseconds)
     */
    public static function convertMicrotime($microtime)
    {
        $parts = explode(' ', $microtime);
        return round(($parts[0] + $parts[1]) * 1000);
    }

    /**
     * This splits a string by the chars in $operators (typical /+-*) and returns an array with them in
     *
     * @param string $string Input string, eg "123 + 456 / 789 - 4
     * @param string $operators Operators to split by, typically "/+-*
     * @return array Array with operators and operands separated.
     * @see \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer::calc(), \TYPO3\CMS\Frontend\Imaging\GifBuilder::calcOffset()
     */