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| 1 | <?php |
| 2 | declare( strict_types = 1 ); |
| 3 | |
| 4 | namespace Wikimedia\Parsoid\Utils; |
| 5 | |
| 6 | use Wikimedia\Assert\Assert; |
| 7 | use Wikimedia\IPUtils; |
| 8 | use Wikimedia\Parsoid\Config\SiteConfig; |
| 9 | use Wikimedia\Parsoid\Core\LinkTarget; |
| 10 | use Wikimedia\Parsoid\Core\LinkTargetTrait; |
| 11 | |
| 12 | class Title implements LinkTarget { |
| 13 | use LinkTargetTrait; |
| 14 | |
| 15 | /** @var string */ |
| 16 | private $interwiki; |
| 17 | |
| 18 | /** @var int */ |
| 19 | private $namespaceId; |
| 20 | |
| 21 | /** @var string */ |
| 22 | private $namespaceName; |
| 23 | |
| 24 | /** @var string */ |
| 25 | private $dbkey; |
| 26 | |
| 27 | /** @var string */ |
| 28 | private $fragment; |
| 29 | |
| 30 | // cached values of prefixed title/key |
| 31 | private ?string $prefixedDBKey = null; |
| 32 | private ?string $prefixedText = null; |
| 33 | |
| 34 | /** |
| 35 | * @param string $interwiki Interwiki prefix, or empty string if none |
| 36 | * @param string $key Page DBkey (with underscores, not spaces) |
| 37 | * @param int $namespaceId |
| 38 | * @param string $namespaceName (with spaces, not underscores) |
| 39 | * @param ?string $fragment |
| 40 | */ |
| 41 | private function __construct( |
| 42 | string $interwiki, string $key, int $namespaceId, string $namespaceName, ?string $fragment = null |
| 43 | ) { |
| 44 | $this->interwiki = $interwiki; |
| 45 | $this->dbkey = $key; |
| 46 | $this->namespaceId = $namespaceId; |
| 47 | $this->namespaceName = $namespaceName; |
| 48 | $this->fragment = $fragment ?? ''; |
| 49 | } |
| 50 | |
| 51 | public static function newFromText( |
| 52 | string $title, SiteConfig $siteConfig, ?int $defaultNs = null |
| 53 | ): Title { |
| 54 | if ( $defaultNs === null ) { |
| 55 | $defaultNs = 0; |
| 56 | } |
| 57 | $origTitle = $title; |
| 58 | |
| 59 | if ( !mb_check_encoding( $title, 'UTF-8' ) ) { |
| 60 | throw new TitleException( "Bad UTF-8 in title \"$origTitle\"", 'title-invalid-utf8', $origTitle ); |
| 61 | } |
| 62 | |
| 63 | // Strip Unicode bidi override characters. |
| 64 | $title = preg_replace( '/[\x{200E}\x{200F}\x{202A}-\x{202E}]+/u', '', $title ); |
| 65 | if ( $title === null ) { |
| 66 | throw new TitleException( "Bad UTF-8 in title \"$origTitle\"", 'title-invalid-utf8', $origTitle ); |
| 67 | } |
| 68 | |
| 69 | // Clean up whitespace |
| 70 | $title = preg_replace( |
| 71 | '/[ _\x{00A0}\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', |
| 72 | '_', $title |
| 73 | ); |
| 74 | // Trim _ from beginning and end |
| 75 | $title = trim( $title, '_' ); |
| 76 | |
| 77 | if ( str_contains( $title, \UtfNormal\Constants::UTF8_REPLACEMENT ) ) { |
| 78 | throw new TitleException( "Bad UTF-8 in title \"$title\"", 'title-invalid-utf8', $title ); |
| 79 | } |
| 80 | |
| 81 | // Initial colon indicates main namespace rather than specified default |
| 82 | // but should not create invalid {ns,title} pairs such as {0,Project:Foo} |
| 83 | if ( $title !== '' && $title[0] === ':' ) { |
| 84 | $title = ltrim( substr( $title, 1 ), '_' ); |
| 85 | $defaultNs = 0; |
| 86 | } |
| 87 | |
| 88 | if ( $title === '' ) { |
| 89 | throw new TitleException( 'Empty title', 'title-invalid-empty', $title ); |
| 90 | } |
| 91 | |
| 92 | $ns = $defaultNs; |
| 93 | $interwiki = null; |
| 94 | |
| 95 | # Namespace or interwiki prefix |
| 96 | $prefixRegexp = "/^(.+?)_*:_*(.*)$/S"; |
| 97 | // MediaWikiTitleCodec::splitTitleString wraps a loop around the |
| 98 | // next section, to allow it to repeat this prefix processing if |
| 99 | // an interwiki prefix is found which points at the local wiki. |
| 100 | $m = []; |
| 101 | if ( preg_match( $prefixRegexp, $title, $m ) ) { |
| 102 | $p = $m[1]; |
| 103 | $nsId = $siteConfig->canonicalNamespaceId( $p ) ?? |
| 104 | $siteConfig->namespaceId( $p ); |
| 105 | if ( $nsId !== null ) { |
| 106 | $title = $m[2]; |
| 107 | $ns = $nsId; |
| 108 | # For Talk:X pages, check if X has a "namespace" prefix |
| 109 | if ( |
| 110 | $nsId === $siteConfig->canonicalNamespaceId( 'talk' ) && |
| 111 | preg_match( $prefixRegexp, $title, $x ) |
| 112 | ) { |
| 113 | if ( $siteConfig->namespaceId( $x[1] ) ) { |
| 114 | // Disallow Talk:File:x type titles. |
| 115 | throw new TitleException( |
| 116 | "Invalid Talk namespace title \"$origTitle\"", 'title-invalid-talk-namespace', $title |
| 117 | ); |
| 118 | } elseif ( $siteConfig->interwikiMapNoNamespaces()[$x[1]] ?? null ) { |
| 119 | // Disallow Talk:Interwiki:x type titles. |
| 120 | throw new TitleException( |
| 121 | "Invalid Talk namespace title \"$origTitle\"", 'title-invalid-talk-namespace', $title |
| 122 | ); |
| 123 | } |
| 124 | } |
| 125 | } elseif ( $siteConfig->interwikiMapNoNamespaces()[$p] ?? null ) { |
| 126 | # Interwiki link |
| 127 | $title = $m[2]; |
| 128 | $interwiki = strtolower( $p ); |
| 129 | |
| 130 | # We don't check for a redundant interwiki prefix to the |
| 131 | # local wiki, like core does here in |
| 132 | # MediaWikiTitleCodec::splitTitleString; |
| 133 | # core then does a `continue` to repeat the processing |
| 134 | |
| 135 | // If there's an initial colon after the interwiki, that also |
| 136 | // resets the default namespace |
| 137 | if ( $title !== '' && $title[0] === ':' ) { |
| 138 | $title = trim( substr( $title, 1 ), '_' ); |
| 139 | $ns = 0; |
| 140 | } |
| 141 | } |
| 142 | # If there's no recognized interwiki or namespace, |
| 143 | # then let the colon expression be part of the title |
| 144 | } |
| 145 | |
| 146 | $fragment = null; |
| 147 | $fragmentIndex = strpos( $title, '#' ); |
| 148 | if ( $fragmentIndex !== false ) { |
| 149 | $fragment = substr( $title, $fragmentIndex + 1 ); |
| 150 | $title = rtrim( substr( $title, 0, $fragmentIndex ), '_' ); |
| 151 | } |
| 152 | |
| 153 | $illegalCharsRe = '/[^' . $siteConfig->legalTitleChars() . ']' |
| 154 | // URL percent encoding sequences interfere with the ability |
| 155 | // to round-trip titles -- you can't link to them consistently. |
| 156 | . '|%[0-9A-Fa-f]{2}' |
| 157 | // XML/HTML character references produce similar issues. |
| 158 | . '|&[A-Za-z0-9\x80-\xff]+;/S'; |
| 159 | if ( preg_match( $illegalCharsRe, $title ) ) { |
| 160 | throw new TitleException( |
| 161 | "Invalid characters in title \"$origTitle\"", 'title-invalid-characters', $title |
| 162 | ); |
| 163 | } |
| 164 | |
| 165 | // Pages with "/./" or "/../" appearing in the URLs will often be |
| 166 | // unreachable due to the way web browsers deal with 'relative' URLs. |
| 167 | // Also, they conflict with subpage syntax. Forbid them explicitly. |
| 168 | if ( str_contains( $title, '.' ) && ( |
| 169 | $title === '.' || $title === '..' || |
| 170 | str_starts_with( $title, './' ) || |
| 171 | str_starts_with( $title, '../' ) || |
| 172 | str_contains( $title, '/./' ) || |
| 173 | str_contains( $title, '/../' ) || |
| 174 | str_ends_with( $title, '/.' ) || |
| 175 | str_ends_with( $title, '/..' ) |
| 176 | ) ) { |
| 177 | throw new TitleException( |
| 178 | "Title \"$origTitle\" contains relative path components", 'title-invalid-relative', $title |
| 179 | ); |
| 180 | } |
| 181 | |
| 182 | // Magic tilde sequences? Nu-uh! |
| 183 | if ( str_contains( $title, '~~~' ) ) { |
| 184 | throw new TitleException( |
| 185 | "Title \"$origTitle\" contains ~~~", 'title-invalid-magic-tilde', $title |
| 186 | ); |
| 187 | } |
| 188 | |
| 189 | $maxLength = $ns === $siteConfig->canonicalNamespaceId( 'special' ) ? 512 : 255; |
| 190 | if ( strlen( $title ) > $maxLength ) { |
| 191 | throw new TitleException( |
| 192 | "Title \"$origTitle\" is too long", 'title-invalid-too-long', $title |
| 193 | ); |
| 194 | } |
| 195 | |
| 196 | if ( $interwiki === null && $siteConfig->namespaceCase( $ns ) === 'first-letter' ) { |
| 197 | $title = $siteConfig->ucfirst( $title ); |
| 198 | } |
| 199 | |
| 200 | # Can't make a link to a namespace alone... "empty" local links can only be |
| 201 | # self-links with a fragment identifier. |
| 202 | if ( $title === '' && $interwiki === null && $ns !== $siteConfig->canonicalNamespaceId( '' ) ) { |
| 203 | throw new TitleException( 'Empty title', 'title-invalid-empty', $title ); |
| 204 | } |
| 205 | |
| 206 | // This is from MediaWikiTitleCodec::splitTitleString() in core |
| 207 | if ( $title !== '' && ( # T329690 |
| 208 | $ns === $siteConfig->canonicalNamespaceId( 'user' ) || |
| 209 | $ns === $siteConfig->canonicalNamespaceId( 'user_talk' ) |
| 210 | ) ) { |
| 211 | $title = IPUtils::sanitizeIP( $title ); |
| 212 | } |
| 213 | |
| 214 | // Any remaining initial :s are illegal. |
| 215 | if ( $title !== '' && $title[0] == ':' ) { |
| 216 | throw new TitleException( |
| 217 | 'Leading colon title', 'title-invalid-leading-colon', $title |
| 218 | ); |
| 219 | } |
| 220 | |
| 221 | // This is not in core's splitTitleString but matches |
| 222 | // mediawiki-title's newFromText. |
| 223 | if ( $ns === $siteConfig->canonicalNamespaceId( 'special' ) ) { |
| 224 | $title = self::fixSpecialName( $siteConfig, $title ); |
| 225 | } |
| 226 | |
| 227 | $namespaceName = $siteConfig->namespaceName( $ns ); |
| 228 | return new self( $interwiki ?? '', $title, $ns, $namespaceName, $fragment ); |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * The interwiki component of this LinkTarget. |
| 233 | * This is the empty string if there is no interwiki component. |
| 234 | * |
| 235 | * @return string |
| 236 | */ |
| 237 | public function getInterwiki(): string { |
| 238 | return $this->interwiki; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Get the DBkey, prefixed with interwiki prefix if any. |
| 243 | * This is Parsoid's convention, which differs from core; |
| 244 | * use ::getDBkey() for a method compatible with core's |
| 245 | * convention. |
| 246 | * |
| 247 | * @return string |
| 248 | * @see ::getDBkey() |
| 249 | */ |
| 250 | public function getKey(): string { |
| 251 | if ( $this->interwiki ) { |
| 252 | return $this->interwiki . ':' . $this->dbkey; |
| 253 | } |
| 254 | return $this->dbkey; |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Get the main part of the link target, in canonical database form. |
| 259 | * |
| 260 | * The main part is the link target without namespace prefix or hash fragment. |
| 261 | * The database form means that spaces become underscores, this is also |
| 262 | * used for URLs. |
| 263 | * |
| 264 | * @return string |
| 265 | */ |
| 266 | public function getDBkey(): string { |
| 267 | return $this->dbkey; |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * Get the prefixed DBkey |
| 272 | * @return string |
| 273 | */ |
| 274 | public function getPrefixedDBKey(): string { |
| 275 | if ( $this->prefixedDBKey === null ) { |
| 276 | $this->prefixedDBKey = $this->namespaceName === '' ? '' : |
| 277 | ( strtr( $this->namespaceName, ' ', '_' ) . ':' ); |
| 278 | $this->prefixedDBKey .= $this->getKey(); |
| 279 | } |
| 280 | return $this->prefixedDBKey; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Get the prefixed text |
| 285 | * @return string |
| 286 | */ |
| 287 | public function getPrefixedText(): string { |
| 288 | if ( $this->prefixedText === null ) { |
| 289 | $this->prefixedText = $this->namespaceName === '' ? '' : |
| 290 | ( $this->namespaceName . ':' ); |
| 291 | $this->prefixedText .= strtr( $this->getKey(), '_', ' ' ); |
| 292 | } |
| 293 | return $this->prefixedText; |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * Get the namespace ID |
| 298 | * @return int |
| 299 | */ |
| 300 | public function getNamespace(): int { |
| 301 | return $this->namespaceId; |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Get the human-readable name for the namespace |
| 306 | * (with spaces, not underscores). |
| 307 | * @return string |
| 308 | */ |
| 309 | public function getNamespaceName(): string { |
| 310 | return $this->namespaceName; |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * Get the link fragment in text form (i.e. the bit after the hash `#`). |
| 315 | * |
| 316 | * @return string link fragment |
| 317 | */ |
| 318 | public function getFragment(): string { |
| 319 | return $this->fragment ?? ''; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Compare with another title. |
| 324 | * |
| 325 | * @param Title $title |
| 326 | * @return bool |
| 327 | */ |
| 328 | public function equals( Title $title ) { |
| 329 | return $this->getNamespace() === $title->getNamespace() && |
| 330 | $this->getKey() === $title->getKey(); |
| 331 | } |
| 332 | |
| 333 | /** |
| 334 | * Returns true if this is a special page. |
| 335 | * |
| 336 | * @return bool |
| 337 | */ |
| 338 | public function isSpecialPage() { |
| 339 | return $this->getNamespace() === -1; // NS_SPECIAL; |
| 340 | } |
| 341 | |
| 342 | /** |
| 343 | * Use the default special page alias. |
| 344 | * |
| 345 | * @param SiteConfig $siteConfig |
| 346 | * @param string $title |
| 347 | * @return string |
| 348 | */ |
| 349 | public static function fixSpecialName( |
| 350 | SiteConfig $siteConfig, string $title |
| 351 | ): string { |
| 352 | $parts = explode( '/', $title, 2 ); |
| 353 | $specialName = $siteConfig->specialPageLocalName( $parts[0] ); |
| 354 | if ( $specialName !== null ) { |
| 355 | $parts[0] = $specialName; |
| 356 | $title = implode( '/', $parts ); |
| 357 | } |
| 358 | return $title; |
| 359 | } |
| 360 | |
| 361 | /** |
| 362 | * Create a new LinkTarget with a different fragment on the same page. |
| 363 | * |
| 364 | * It is expected that the same type of object will be returned, but the |
| 365 | * only requirement is that it is a LinkTarget. |
| 366 | * |
| 367 | * @param string $fragment The fragment override, or "" to remove it. |
| 368 | * |
| 369 | * @return self |
| 370 | */ |
| 371 | public function createFragmentTarget( string $fragment ) { |
| 372 | return new self( $this->interwiki, $this->dbkey, $this->namespaceId, $this->namespaceName, $fragment ?: null ); |
| 373 | } |
| 374 | |
| 375 | /** |
| 376 | * Convert LinkTarget from core (or other implementation) into a |
| 377 | * Parsoid Title. |
| 378 | * |
| 379 | * @param LinkTarget $linkTarget |
| 380 | * @return self |
| 381 | */ |
| 382 | public static function newFromLinkTarget( |
| 383 | LinkTarget $linkTarget, SiteConfig $siteConfig |
| 384 | ) { |
| 385 | if ( $linkTarget instanceof Title ) { |
| 386 | return $linkTarget; |
| 387 | } |
| 388 | $ns = $linkTarget->getNamespace(); |
| 389 | $namespaceName = $siteConfig->namespaceName( $ns ); |
| 390 | Assert::invariant( |
| 391 | $namespaceName !== null, |
| 392 | "Badtitle ({$linkTarget}) in unknown namespace ({$ns})" |
| 393 | ); |
| 394 | return new self( |
| 395 | $linkTarget->getInterwiki(), |
| 396 | $linkTarget->getDBkey(), |
| 397 | $linkTarget->getNamespace(), |
| 398 | $namespaceName, |
| 399 | $linkTarget->getFragment() |
| 400 | ); |
| 401 | } |
| 402 | } |