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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | // phpcs:disable PSR12.Properties.ConstantVisibility.NotFound |
| 8 | |
| 9 | namespace MediaWiki; |
| 10 | |
| 11 | /** |
| 12 | * Check PHP Version, as well as for composer dependencies in entry points, |
| 13 | * and display something vaguely comprehensible in the event of a totally |
| 14 | * unrecoverable error. |
| 15 | * |
| 16 | * @note Since we can't rely on anything external, the minimum PHP versions |
| 17 | * and MW current version are hardcoded in this class. |
| 18 | * |
| 19 | * @note This class should be compatible with PHP 5.4 through PHP 8 |
| 20 | * (without warnings). It is no longer compatible with PHP 4. |
| 21 | * |
| 22 | * @internal |
| 23 | */ |
| 24 | class PHPVersionCheck { |
| 25 | /** |
| 26 | * The number of the MediaWiki version used. |
| 27 | * |
| 28 | * If you're updating MW_VERSION in Defines.php, you must also update this value. |
| 29 | * |
| 30 | * @note For PHP 7.0 compatibility, this constant has no visibility keyword. |
| 31 | * |
| 32 | * @internal |
| 33 | */ |
| 34 | const MW_VERSION = '1.47'; |
| 35 | |
| 36 | /** |
| 37 | * @var string[] A mapping of PHP functions to PHP extensions. |
| 38 | * @note For PHP 5.5 compatibility, this is a property rather than a constant. |
| 39 | */ |
| 40 | private static $functionsExtensionsMapping = [ |
| 41 | 'mb_substr' => 'mbstring', |
| 42 | 'xml_parser_create' => 'xml', |
| 43 | 'ctype_digit' => 'ctype', |
| 44 | 'iconv' => 'iconv', |
| 45 | 'mime_content_type' => 'fileinfo', |
| 46 | 'intl_is_failure' => 'intl', |
| 47 | ]; |
| 48 | |
| 49 | /** |
| 50 | * @var string The format used for errors. One of "text" or "html" |
| 51 | */ |
| 52 | private $format; |
| 53 | |
| 54 | /** |
| 55 | * @var string |
| 56 | */ |
| 57 | private $scriptPath; |
| 58 | |
| 59 | /** |
| 60 | * @param string $format The format used for errors. One of "text" or "html" |
| 61 | * @param string $scriptPath Used when an error is formatted as HTML. |
| 62 | */ |
| 63 | public function __construct( $format = 'text', $scriptPath = '/' ) { |
| 64 | $this->format = $format; |
| 65 | $this->scriptPath = $scriptPath; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Displays an error, if the installed PHP version does not meet the minimum requirement. |
| 70 | */ |
| 71 | private function checkRequiredPHPVersion() { |
| 72 | // NOTE: Keep this in sync with composer.json and ScopeStructureTest.php |
| 73 | $minimumVersion = '8.3.0'; |
| 74 | |
| 75 | /** |
| 76 | * This is a list of known-bad ranges of PHP versions. Syntax is like SemVer – either: |
| 77 | * |
| 78 | * - '1.2.3' to prohibit a single version of PHP, or |
| 79 | * - '1.2.3 – 1.2.5' to block a range, inclusive. |
| 80 | * |
| 81 | * Whitespace will be ignored. |
| 82 | * |
| 83 | * The key is not shown to users; use it to prompt future developers as to why this was |
| 84 | * chosen, ideally one or more Phabricator task references. |
| 85 | * |
| 86 | * Remember to drop irrelevant ranges when bumping $minimumVersion. |
| 87 | */ |
| 88 | $knownBad = [ |
| 89 | ]; |
| 90 | |
| 91 | $passes = version_compare( PHP_VERSION, $minimumVersion, '>=' ); |
| 92 | |
| 93 | $versionString = "PHP $minimumVersion or higher"; |
| 94 | |
| 95 | // Left as a programmatic check to make it easier to update. |
| 96 | if ( count( $knownBad ) ) { |
| 97 | $versionString .= ' (and not ' . implode( ', ', array_values( $knownBad ) ) . ')'; |
| 98 | |
| 99 | foreach ( $knownBad as $range ) { |
| 100 | // As we don't have composer at this point, we have to do our own version range checking. |
| 101 | if ( strpos( $range, '-' ) ) { |
| 102 | $passes = $passes && !( |
| 103 | version_compare( PHP_VERSION, trim( strstr( $range, '-', true ) ), '>=' ) |
| 104 | && version_compare( PHP_VERSION, trim( substr( strstr( $range, '-', false ), 1 ) ), '<' ) |
| 105 | ); |
| 106 | } else { |
| 107 | $passes = $passes && version_compare( PHP_VERSION, trim( $range ), '<>' ); |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | if ( !$passes ) { |
| 113 | $mwVersion = self::MW_VERSION; |
| 114 | $cliText = "Error: You are using an unsupported PHP version (PHP " . PHP_VERSION . ").\n" |
| 115 | . "MediaWiki $mwVersion needs $versionString.\n\nCheck if you might have a newer " |
| 116 | . "PHP executable with a different name.\n\n"; |
| 117 | |
| 118 | $web = []; |
| 119 | $web['intro'] = "MediaWiki $mwVersion requires $versionString; you are using PHP " |
| 120 | . PHP_VERSION . "."; |
| 121 | |
| 122 | $web['longTitle'] = "Supported PHP versions"; |
| 123 | // phpcs:disable Generic.Files.LineLength |
| 124 | $web['longHtml'] = <<<HTML |
| 125 | <p> |
| 126 | Please consider <a href="https://www.php.net/downloads.php">upgrading your copy of PHP</a>. |
| 127 | PHP versions less than v8.2.0 are no longer <a href="https://www.php.net/supported-versions.php">supported</a> |
| 128 | by the PHP Group and will not receive security or bugfix updates. |
| 129 | </p> |
| 130 | <p> |
| 131 | If for some reason you are unable to upgrade your PHP version, you will need to |
| 132 | <a href="https://www.mediawiki.org/wiki/Download">download</a> an older version of |
| 133 | MediaWiki from our website. See our |
| 134 | <a href="https://www.mediawiki.org/wiki/Compatibility#PHP">compatibility page</a> |
| 135 | for details of which versions are compatible with prior versions of PHP. |
| 136 | </p> |
| 137 | HTML; |
| 138 | // phpcs:enable Generic.Files.LineLength |
| 139 | $this->triggerError( |
| 140 | $web, |
| 141 | $cliText |
| 142 | ); |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * Displays an error, if the vendor/autoload.php file could not be found. |
| 148 | */ |
| 149 | private function checkVendorExistence() { |
| 150 | if ( !file_exists( __DIR__ . '/../vendor/autoload.php' ) ) { |
| 151 | $cliText = "Error: You are missing some dependencies. \n" |
| 152 | . "MediaWiki has dependencies that need to be installed via Composer\n" |
| 153 | . "or from a separate repository. Please see\n" |
| 154 | . "https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries\n" |
| 155 | . "for help with installing them."; |
| 156 | |
| 157 | $web = []; |
| 158 | $web['intro'] = "Installing some dependencies is required."; |
| 159 | $web['longTitle'] = 'Dependencies'; |
| 160 | // phpcs:disable Generic.Files.LineLength |
| 161 | $web['longHtml'] = <<<HTML |
| 162 | <p> |
| 163 | MediaWiki has dependencies that need to be installed via Composer |
| 164 | or from a separate repository. Please see the |
| 165 | <a href="https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries">instructions |
| 166 | for installing external libraries</a> on MediaWiki.org. |
| 167 | </p> |
| 168 | HTML; |
| 169 | // phpcs:enable Generic.Files.LineLength |
| 170 | |
| 171 | $this->triggerError( $web, $cliText ); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Displays an error, if a PHP extension does not exist. |
| 177 | */ |
| 178 | private function checkExtensionExistence() { |
| 179 | $missingExtensions = []; |
| 180 | foreach ( self::$functionsExtensionsMapping as $function => $extension ) { |
| 181 | if ( !function_exists( $function ) ) { |
| 182 | $missingExtensions[] = [ $extension ]; |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | // Special case: either of those is required, but only on 32-bit systems (T391169) |
| 187 | if ( PHP_INT_SIZE < 8 && !extension_loaded( 'gmp' ) && !extension_loaded( 'bcmath' ) ) { |
| 188 | $missingExtensions[] = [ 'bcmath', 'gmp' ]; |
| 189 | } |
| 190 | |
| 191 | if ( $missingExtensions ) { |
| 192 | $missingExtText = ''; |
| 193 | $missingExtHtml = ''; |
| 194 | $baseUrl = 'https://www.php.net'; |
| 195 | foreach ( $missingExtensions as $extNames ) { |
| 196 | $plaintextLinks = []; |
| 197 | $htmlLinks = []; |
| 198 | foreach ( $extNames as $ext ) { |
| 199 | $plaintextLinks[] = "$ext <$baseUrl/$ext>"; |
| 200 | $htmlLinks[] = "<b>$ext</b> (<a href=\"$baseUrl/$ext\">more information</a>)"; |
| 201 | } |
| 202 | |
| 203 | $missingExtText .= ' * ' . implode( ' or ', $plaintextLinks ) . "\n"; |
| 204 | $missingExtHtml .= "<li>" . implode( ' or ', $htmlLinks ) . "</li>"; |
| 205 | } |
| 206 | |
| 207 | $cliText = "Error: Missing one or more required PHP extensions. Please see\n" |
| 208 | . "https://www.mediawiki.org/wiki/Manual:Installation_requirements#PHP\n" |
| 209 | . "for help with installing them.\n" |
| 210 | . "Please install or enable:\n" . $missingExtText; |
| 211 | |
| 212 | $web = []; |
| 213 | $web['intro'] = "Installing some PHP extensions is required."; |
| 214 | $web['longTitle'] = 'Required PHP extensions'; |
| 215 | $web['longHtml'] = <<<HTML |
| 216 | <p> |
| 217 | You are missing one or more extensions to PHP that MediaWiki requires to run. Please see the |
| 218 | <a href="https://www.mediawiki.org/wiki/Manual:Installation_requirements#PHP">PHP |
| 219 | installation requirements</a> on MediaWiki.org. |
| 220 | </p> |
| 221 | <p>Please install or enable:</p> |
| 222 | <ul> |
| 223 | $missingExtHtml |
| 224 | </ul> |
| 225 | HTML; |
| 226 | |
| 227 | $this->triggerError( $web, $cliText ); |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Output headers that prevents error pages to be cached. |
| 233 | */ |
| 234 | private function outputHTMLHeader() { |
| 235 | $protocol = isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0'; |
| 236 | |
| 237 | header( "$protocol 500 MediaWiki configuration Error" ); |
| 238 | // Don't cache error pages! They cause no end of trouble... |
| 239 | header( 'Cache-Control: no-cache' ); |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * Returns an error page, which is suitable for output to the end user via a web browser. |
| 244 | * |
| 245 | * @param string $introText |
| 246 | * @param string $longTitle |
| 247 | * @param string $longHtml |
| 248 | * @return string |
| 249 | */ |
| 250 | private function getIndexErrorOutput( $introText, $longTitle, $longHtml ) { |
| 251 | $encLogo = |
| 252 | htmlspecialchars( str_replace( '//', '/', $this->scriptPath . '/' ) . |
| 253 | 'resources/assets/mediawiki.png' ); |
| 254 | |
| 255 | $introHtml = htmlspecialchars( $introText ); |
| 256 | $longTitleHtml = htmlspecialchars( $longTitle ); |
| 257 | |
| 258 | header( 'Content-type: text/html; charset=UTF-8' ); |
| 259 | |
| 260 | $mwVersion = self::MW_VERSION; |
| 261 | $finalOutput = <<<HTML |
| 262 | <!DOCTYPE html> |
| 263 | <html lang="en" dir="ltr"> |
| 264 | <head> |
| 265 | <meta charset="UTF-8" /> |
| 266 | <title>MediaWiki {$mwVersion}</title> |
| 267 | <style media="screen"> |
| 268 | body { |
| 269 | color: #000; |
| 270 | background-color: #fff; |
| 271 | font-family: sans-serif; |
| 272 | padding: 2em; |
| 273 | text-align: center; |
| 274 | } |
| 275 | p, img, h1, h2, ul { |
| 276 | text-align: left; |
| 277 | margin: 0.5em 0 1em; |
| 278 | } |
| 279 | h1 { |
| 280 | font-size: 120%; |
| 281 | } |
| 282 | h2 { |
| 283 | font-size: 110%; |
| 284 | } |
| 285 | </style> |
| 286 | </head> |
| 287 | <body> |
| 288 | <img src="{$encLogo}" alt="The MediaWiki logo" /> |
| 289 | <h1>MediaWiki {$mwVersion} internal error</h1> |
| 290 | <p> |
| 291 | {$introHtml} |
| 292 | </p> |
| 293 | <h2>{$longTitleHtml}</h2> |
| 294 | {$longHtml} |
| 295 | </body> |
| 296 | </html> |
| 297 | HTML; |
| 298 | |
| 299 | return $finalOutput; |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * Display something vaguely comprehensible in the event of a totally unrecoverable error. |
| 304 | * Does not assume access to *anything*; no globals, no autoloader, no database, no localisation. |
| 305 | * |
| 306 | * This function immediately terminates the PHP process. |
| 307 | * |
| 308 | * @param string[] $web |
| 309 | * - (string) intro: Short error message, displayed on top. |
| 310 | * - (string) longTitle: Title for the longer message. |
| 311 | * - (string) longHtml: The longer message, as raw HTML. |
| 312 | * @param string $cliText |
| 313 | */ |
| 314 | private function triggerError( array $web, $cliText ) { |
| 315 | if ( $this->format === 'html' ) { |
| 316 | // Used by index.php and mw-config/index.php |
| 317 | $this->outputHTMLHeader(); |
| 318 | $finalOutput = $this->getIndexErrorOutput( |
| 319 | $web['intro'], |
| 320 | $web['longTitle'], |
| 321 | $web['longHtml'] |
| 322 | ); |
| 323 | } else { |
| 324 | // Used by Maintenance.php (CLI) |
| 325 | $finalOutput = $cliText; |
| 326 | } |
| 327 | |
| 328 | echo "$finalOutput\n"; |
| 329 | die( 1 ); |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * Check PHP version and that external dependencies are installed, and |
| 334 | * display an informative error if either condition is not satisfied. |
| 335 | * |
| 336 | * @internal |
| 337 | */ |
| 338 | public function run() { |
| 339 | $this->checkRequiredPHPVersion(); |
| 340 | $this->checkVendorExistence(); |
| 341 | $this->checkExtensionExistence(); |
| 342 | } |
| 343 | } |