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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
// phpcs:disable Generic.Arrays.DisallowLongArraySyntax,PSR2.Classes.PropertyDeclaration,MediaWiki.Usage.DirUsage
// phpcs:disable Squiz.Scope.MemberVarScope.Missing,Squiz.Scope.MethodScope.Missing
// phpcs:disable MediaWiki.Usage.StaticClosure.StaticClosure
/**
* Check PHP Version, as well as for composer dependencies in entry points,
* and display something vaguely comprehensible in the event of a totally
* unrecoverable error.
*
* @note Since we can't rely on anything external, the minimum PHP versions
* and MW current version are hardcoded in this class.
*
* @note This class uses setter methods instead of a constructor so that
* it can be compatible with PHP 4 through PHP 8 (without warnings).
*/
class PHPVersionCheck {
/** @var string The number of the MediaWiki version used. If you're updating MW_VERSION in Defines.php, you must also update this value. */
var $mwVersion = '1.44';
/** @var string[] A mapping of PHP functions to PHP extensions. */
var $functionsExtensionsMapping = array(
'mb_substr' => 'mbstring',
'xml_parser_create' => 'xml',
'ctype_digit' => 'ctype',
'json_decode' => 'json',
'iconv' => 'iconv',
'mime_content_type' => 'fileinfo',
'intl_is_failure' => 'intl',
);
/**
* @var string The format used for errors. One of "text" or "html"
*/
var $format = 'text';
/**
* @var string
*/
var $scriptPath = '/';
/**
* Set the format used for errors.
*
* @param string $format One of "text" or "html"
*/
function setFormat( $format ) {
$this->format = $format;
}
/**
* Set the script path used for images in HTML-formatted errors.
*
* @param string $scriptPath
*/
function setScriptPath( $scriptPath ) {
$this->scriptPath = $scriptPath;
}
/**
* Displays an error, if the installed PHP version does not meet the minimum requirement.
*/
function checkRequiredPHPVersion() {
// This value should match the PHP version specified in composer.json,
// .phan/config.php, and ScopeStructureTest.php
$minimumVersion = '8.1.0';
/**
* This is a list of known-bad ranges of PHP versions. Syntax is like SemVer – either:
*
* - '1.2.3' to prohibit a single version of PHP, or
* - '1.2.3 – 1.2.5' to block a range, inclusive.
*
* Whitespace will be ignored.
*
* The key is not shown to users; use it to prompt future developers as to why this was
* chosen, ideally one or more Phabricator task references.
*
* Remember to drop irrelevant ranges when bumping $minimumVersion.
*/
$knownBad = array(
);
$passes = version_compare( PHP_VERSION, $minimumVersion, '>=' );
$versionString = "PHP $minimumVersion or higher";
// Left as a programmatic check to make it easier to update.
if ( count( $knownBad ) ) {
$versionString .= ' (and not ' . implode( ', ', array_values( $knownBad ) ) . ')';
foreach ( $knownBad as $range ) {
// As we don't have composer at this point, we have to do our own version range checking.
if ( strpos( $range, '-' ) ) {
$passes = $passes && !(
version_compare( PHP_VERSION, trim( strstr( $range, '-', true ) ), '>=' )
&& version_compare( PHP_VERSION, trim( substr( strstr( $range, '-', false ), 1 ) ), '<' )
);
} else {
$passes = $passes && version_compare( PHP_VERSION, trim( $range ), '<>' );
}
}
}
if ( !$passes ) {
$cliText = "Error: You are using an unsupported PHP version (PHP " . PHP_VERSION . ").\n"
. "MediaWiki $this->mwVersion needs $versionString.\n\nCheck if you might have a newer "
. "PHP executable with a different name.\n\n";
$web = array();
$web['intro'] = "MediaWiki $this->mwVersion requires $versionString; you are using PHP "
. PHP_VERSION . ".";
$web['longTitle'] = "Supported PHP versions";
// phpcs:disable Generic.Files.LineLength
$web['longHtml'] = <<<HTML
<p>
Please consider <a href="https://www.php.net/downloads.php">upgrading your copy of PHP</a>.
PHP versions less than v8.1.0 are no longer <a href="https://www.php.net/supported-versions.php">supported</a>
by the PHP Group and will not receive security or bugfix updates.
</p>
<p>
If for some reason you are unable to upgrade your PHP version, you will need to
<a href="https://www.mediawiki.org/wiki/Download">download</a> an older version of
MediaWiki from our website. See our
<a href="https://www.mediawiki.org/wiki/Compatibility#PHP">compatibility page</a>
for details of which versions are compatible with prior versions of PHP.
</p>
HTML;
// phpcs:enable Generic.Files.LineLength
$this->triggerError(
$web,
$cliText
);
}
}
/**
* Displays an error, if the vendor/autoload.php file could not be found.
*/
function checkVendorExistence() {
if ( !file_exists( dirname( __FILE__ ) . '/../vendor/autoload.php' ) ) {
$cliText = "Error: You are missing some dependencies. \n"
. "MediaWiki has dependencies that need to be installed via Composer\n"
. "or from a separate repository. Please see\n"
. "https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries\n"
. "for help with installing them.";
$web = array();
$web['intro'] = "Installing some dependencies is required.";
$web['longTitle'] = 'Dependencies';
// phpcs:disable Generic.Files.LineLength
$web['longHtml'] = <<<HTML
<p>
MediaWiki has dependencies that need to be installed via Composer
or from a separate repository. Please see the
<a href="https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries">instructions
for installing external libraries</a> on MediaWiki.org.
</p>
HTML;
// phpcs:enable Generic.Files.LineLength
$this->triggerError( $web, $cliText );
}
}
/**
* Displays an error, if a PHP extension does not exist.
*/
function checkExtensionExistence() {
$missingExtensions = array();
foreach ( $this->functionsExtensionsMapping as $function => $extension ) {
if ( !function_exists( $function ) ) {
$missingExtensions[] = array( $extension );
}
}
// Special case: either of those is required, but only on 32-bit systems (T391169)
if ( PHP_INT_SIZE < 8 && !extension_loaded( 'gmp' ) && !extension_loaded( 'bcmath' ) ) {
$missingExtensions[] = array( 'bcmath', 'gmp' );
}
if ( $missingExtensions ) {
$missingExtText = '';
$missingExtHtml = '';
$baseUrl = 'https://www.php.net';
foreach ( $missingExtensions as $extNames ) {
$plaintextLinks = array();
$htmlLinks = array();
foreach ( $extNames as $ext ) {
$plaintextLinks[] = "$ext <$baseUrl/$ext>";
$htmlLinks[] = "<b>$ext</b> (<a href=\"$baseUrl/$ext\">more information</a>)";
}
$missingExtText .= ' * ' . implode( ' or ', $plaintextLinks ) . "\n";
$missingExtHtml .= "<li>" . implode( ' or ', $htmlLinks ) . "</li>";
}
$cliText = "Error: Missing one or more required PHP extensions. Please see\n"
. "https://www.mediawiki.org/wiki/Manual:Installation_requirements#PHP\n"
. "for help with installing them.\n"
. "Please install or enable:\n" . $missingExtText;
$web = array();
$web['intro'] = "Installing some PHP extensions is required.";
$web['longTitle'] = 'Required PHP extensions';
$web['longHtml'] = <<<HTML
<p>
You are missing one or more extensions to PHP that MediaWiki requires to run. Please see the
<a href="https://www.mediawiki.org/wiki/Manual:Installation_requirements#PHP">PHP
installation requirements</a> on MediaWiki.org.
</p>
<p>Please install or enable:</p>
<ul>
$missingExtHtml
</ul>
HTML;
$this->triggerError( $web, $cliText );
}
}
/**
* Output headers that prevents error pages to be cached.
*/
function outputHTMLHeader() {
$protocol = isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0';
header( "$protocol 500 MediaWiki configuration Error" );
// Don't cache error pages! They cause no end of trouble...
header( 'Cache-Control: no-cache' );
}
/**
* Returns an error page, which is suitable for output to the end user via a web browser.
*
* @param string $introText
* @param string $longTitle
* @param string $longHtml
* @return string
*/
function getIndexErrorOutput( $introText, $longTitle, $longHtml ) {
$encLogo =
htmlspecialchars( str_replace( '//', '/', $this->scriptPath . '/' ) .
'resources/assets/mediawiki.png' );
$introHtml = htmlspecialchars( $introText );
$longTitleHtml = htmlspecialchars( $longTitle );
header( 'Content-type: text/html; charset=UTF-8' );
$finalOutput = <<<HTML
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="UTF-8" />
<title>MediaWiki {$this->mwVersion}</title>
<style media="screen">
body {
color: #000;
background-color: #fff;
font-family: sans-serif;
padding: 2em;
text-align: center;
}
p, img, h1, h2, ul {
text-align: left;
margin: 0.5em 0 1em;
}
h1 {
font-size: 120%;
}
h2 {
font-size: 110%;
}
</style>
</head>
<body>
<img src="{$encLogo}" alt="The MediaWiki logo" />
<h1>MediaWiki {$this->mwVersion} internal error</h1>
<p>
{$introHtml}
</p>
<h2>{$longTitleHtml}</h2>
{$longHtml}
</body>
</html>
HTML;
return $finalOutput;
}
/**
* Display something vaguely comprehensible in the event of a totally unrecoverable error.
* Does not assume access to *anything*; no globals, no autoloader, no database, no localisation.
* Safe for PHP4 (and putting this here means that WebStart.php and GlobalSettings.php
* no longer need to be).
*
* This function immediately terminates the PHP process.
*
* @param string[] $web
* - (string) intro: Short error message, displayed on top.
* - (string) longTitle: Title for the longer message.
* - (string) longHtml: The longer message, as raw HTML.
* @param string $cliText
*/
function triggerError( $web, $cliText ) {
if ( $this->format === 'html' ) {
// Used by index.php and mw-config/index.php
$this->outputHTMLHeader();
$finalOutput = $this->getIndexErrorOutput(
$web['intro'],
$web['longTitle'],
$web['longHtml']
);
} else {
// Used by Maintenance.php (CLI)
$finalOutput = $cliText;
}
echo "$finalOutput\n";
die( 1 );
}
}
/**
* Check PHP version and that external dependencies are installed, and
* display an informative error if either condition is not satisfied.
*
* @param string $format One of "text" or "html"
* @param string $scriptPath Used when an error is formatted as HTML.
*/
function wfEntryPointCheck( $format = 'text', $scriptPath = '/' ) {
$phpVersionCheck = new PHPVersionCheck();
$phpVersionCheck->setFormat( $format );
$phpVersionCheck->setScriptPath( $scriptPath );
$phpVersionCheck->checkRequiredPHPVersion();
$phpVersionCheck->checkVendorExistence();
$phpVersionCheck->checkExtensionExistence();
}