| 1 |
<?php |
| 2 |
namespace Elementor\Modules\MarkdownRender; |
| 3 |
|
| 4 |
use WP_HTML_Processor; |
| 5 |
|
| 6 |
if ( ! defined( 'ABSPATH' ) ) { |
| 7 |
exit; |
| 8 |
} |
| 9 |
|
| 10 |
class Html_To_Markdown { |
| 11 |
|
| 12 |
const SAFE_URL_SCHEMES = [ 'http', 'https', 'mailto', 'tel', 'ftp', 'ftps' ]; |
| 13 |
|
| 14 |
const SAFE_DATA_PREFIXES = [ 'data:image/png', 'data:image/jpeg', 'data:image/jpg', 'data:image/gif', 'data:image/webp', 'data:image/svg+xml' ]; |
| 15 |
|
| 16 |
const ESCAPABLE_MARKDOWN_CHARS = [ '\\', '`', '*', '_', '[', ']' ]; |
| 17 |
|
| 18 |
const VOID_TAGS = [ 'br', 'hr', 'img', 'input', 'meta', 'link', 'area', 'base', 'col', 'embed', 'param', 'source', 'track', 'wbr' ]; |
| 19 |
|
| 20 |
private $output = ''; |
| 21 |
|
| 22 |
private $inline_buffer = ''; |
| 23 |
|
| 24 |
private $list_stack = []; |
| 25 |
|
| 26 |
private $blockquote_depth = 0; |
| 27 |
|
| 28 |
private $in_pre = false; |
| 29 |
|
| 30 |
private $pre_buffer = ''; |
| 31 |
|
| 32 |
private $pre_language = ''; |
| 33 |
|
| 34 |
private $in_code = false; |
| 35 |
|
| 36 |
private $in_link = false; |
| 37 |
|
| 38 |
private $link_href = ''; |
| 39 |
|
| 40 |
private $link_buffer = ''; |
| 41 |
|
| 42 |
private $in_table = false; |
| 43 |
|
| 44 |
private $table_headers = []; |
| 45 |
|
| 46 |
private $table_rows = []; |
| 47 |
|
| 48 |
private $current_row = []; |
| 49 |
|
| 50 |
private $current_cell = ''; |
| 51 |
|
| 52 |
private $in_table_head = false; |
| 53 |
|
| 54 |
private $row_is_header = false; |
| 55 |
|
| 56 |
private $heading_level = 0; |
| 57 |
|
| 58 |
public static function convert( string $html ): string { |
| 59 |
if ( '' === $html ) { |
| 60 |
return ''; |
| 61 |
} |
| 62 |
|
| 63 |
$instance = new self(); |
| 64 |
|
| 65 |
return $instance->run( $html ); |
| 66 |
} |
| 67 |
|
| 68 |
private function run( string $html ): string { |
| 69 |
$html = $this->normalize_html( $html ); |
| 70 |
|
| 71 |
$processor = WP_HTML_Processor::create_full_parser( $html ); |
| 72 |
|
| 73 |
if ( null === $processor ) { |
| 74 |
return $this->fallback( $html ); |
| 75 |
} |
| 76 |
|
| 77 |
try { |
| 78 |
$this->walk( $processor ); |
| 79 |
} catch ( \Exception $e ) { |
| 80 |
return $this->fallback( $html ); |
| 81 |
} |
| 82 |
|
| 83 |
$this->flush_inline(); |
| 84 |
|
| 85 |
$output = $this->output; |
| 86 |
$output = preg_replace( "/[ \t]+\n/", "\n", $output ); |
| 87 |
$output = preg_replace( "/\n{3,}/", "\n\n", $output ); |
| 88 |
|
| 89 |
return trim( $output ); |
| 90 |
} |
| 91 |
|
| 92 |
private function fallback( string $html ): string { |
| 93 |
$text = wp_strip_all_tags( $html ); |
| 94 |
$text = html_entity_decode( $text, ENT_QUOTES, 'UTF-8' ); |
| 95 |
|
| 96 |
return trim( preg_replace( "/\n{3,}/", "\n\n", $text ) ); |
| 97 |
} |
| 98 |
|
| 99 |
private function normalize_html( string $html ): string { |
| 100 |
$html = preg_replace( '/\r\n?/', "\n", $html ); |
| 101 |
$html = preg_replace( '#<script\b[^>]*>.*?</script>#is', '', $html ); |
| 102 |
$html = preg_replace( '#<style\b[^>]*>.*?</style>#is', '', $html ); |
| 103 |
$html = str_replace( "\xE2\x80\x8B", '', $html ); |
| 104 |
|
| 105 |
return $html; |
| 106 |
} |
| 107 |
|
| 108 |
private function walk( WP_HTML_Processor $p ): void { |
| 109 |
while ( $p->next_token() ) { |
| 110 |
$type = $p->get_token_type(); |
| 111 |
|
| 112 |
if ( '#text' === $type ) { |
| 113 |
$this->handle_text( $p->get_modifiable_text() ); |
| 114 |
continue; |
| 115 |
} |
| 116 |
|
| 117 |
if ( '#tag' !== $type ) { |
| 118 |
continue; |
| 119 |
} |
| 120 |
|
| 121 |
$tag = strtolower( (string) $p->get_tag() ); |
| 122 |
$is_closer = $p->is_tag_closer(); |
| 123 |
$is_void = in_array( $tag, self::VOID_TAGS, true ); |
| 124 |
|
| 125 |
if ( $is_closer ) { |
| 126 |
$this->handle_close( $tag ); |
| 127 |
continue; |
| 128 |
} |
| 129 |
|
| 130 |
$this->handle_open( $tag, $p ); |
| 131 |
|
| 132 |
if ( $is_void ) { |
| 133 |
$this->handle_close( $tag ); |
| 134 |
} |
| 135 |
} |
| 136 |
} |
| 137 |
|
| 138 |
private function handle_text( string $text ): void { |
| 139 |
if ( '' === $text ) { |
| 140 |
return; |
| 141 |
} |
| 142 |
|
| 143 |
if ( $this->in_pre ) { |
| 144 |
$this->pre_buffer .= $text; |
| 145 |
return; |
| 146 |
} |
| 147 |
|
| 148 |
if ( $this->in_table ) { |
| 149 |
$this->current_cell .= $this->escape_text( $text, false ); |
| 150 |
return; |
| 151 |
} |
| 152 |
|
| 153 |
$collapsed = preg_replace( '/[ \t\n]+/', ' ', $text ); |
| 154 |
$escaped = $this->escape_text( $collapsed, $this->in_code ); |
| 155 |
|
| 156 |
if ( $this->in_link ) { |
| 157 |
$this->link_buffer .= $escaped; |
| 158 |
return; |
| 159 |
} |
| 160 |
|
| 161 |
$this->inline_buffer .= $escaped; |
| 162 |
} |
| 163 |
|
| 164 |
private function handle_open( string $tag, WP_HTML_Processor $p ): void { |
| 165 |
switch ( $tag ) { |
| 166 |
case 'p': |
| 167 |
case 'div': |
| 168 |
case 'section': |
| 169 |
case 'article': |
| 170 |
case 'header': |
| 171 |
case 'footer': |
| 172 |
case 'main': |
| 173 |
case 'aside': |
| 174 |
case 'figure': |
| 175 |
$this->flush_inline(); |
| 176 |
return; |
| 177 |
|
| 178 |
case 'h1': |
| 179 |
case 'h2': |
| 180 |
case 'h3': |
| 181 |
case 'h4': |
| 182 |
case 'h5': |
| 183 |
case 'h6': |
| 184 |
$this->flush_inline(); |
| 185 |
$this->heading_level = (int) $tag[1]; |
| 186 |
$this->inline_buffer = str_repeat( '#', $this->heading_level ) . ' '; |
| 187 |
return; |
| 188 |
|
| 189 |
case 'br': |
| 190 |
if ( $this->in_table ) { |
| 191 |
$this->current_cell .= ' '; |
| 192 |
return; |
| 193 |
} |
| 194 |
if ( $this->heading_level > 0 ) { |
| 195 |
$this->inline_buffer .= ' '; |
| 196 |
return; |
| 197 |
} |
| 198 |
$this->inline_buffer .= "\n"; |
| 199 |
return; |
| 200 |
|
| 201 |
case 'hr': |
| 202 |
$this->flush_inline(); |
| 203 |
$this->output .= "\n\n---\n\n"; |
| 204 |
return; |
| 205 |
|
| 206 |
case 'strong': |
| 207 |
case 'b': |
| 208 |
$this->append_inline( '**' ); |
| 209 |
return; |
| 210 |
|
| 211 |
case 'em': |
| 212 |
case 'i': |
| 213 |
$this->append_inline( '*' ); |
| 214 |
return; |
| 215 |
|
| 216 |
case 'del': |
| 217 |
case 's': |
| 218 |
case 'strike': |
| 219 |
$this->append_inline( '~~' ); |
| 220 |
return; |
| 221 |
|
| 222 |
case 'code': |
| 223 |
if ( $this->in_pre ) { |
| 224 |
$lang = (string) $p->get_attribute( 'class' ); |
| 225 |
if ( preg_match( '/language-([A-Za-z0-9_+\-]+)/', $lang, $m ) ) { |
| 226 |
$this->pre_language = $m[1]; |
| 227 |
} |
| 228 |
return; |
| 229 |
} |
| 230 |
$this->in_code = true; |
| 231 |
$this->append_inline( '`CODE_OPEN`' ); |
| 232 |
return; |
| 233 |
|
| 234 |
case 'pre': |
| 235 |
$this->flush_inline(); |
| 236 |
$this->in_pre = true; |
| 237 |
$this->pre_buffer = ''; |
| 238 |
$this->pre_language = ''; |
| 239 |
return; |
| 240 |
|
| 241 |
case 'a': |
| 242 |
$href = (string) $p->get_attribute( 'href' ); |
| 243 |
$this->in_link = true; |
| 244 |
$this->link_href = $href; |
| 245 |
$this->link_buffer = ''; |
| 246 |
return; |
| 247 |
|
| 248 |
case 'img': |
| 249 |
$this->emit_image( $p ); |
| 250 |
return; |
| 251 |
|
| 252 |
case 'ul': |
| 253 |
case 'ol': |
| 254 |
if ( ! empty( $this->list_stack ) && '' !== trim( $this->inline_buffer ) ) { |
| 255 |
$this->emit_list_item(); |
| 256 |
} else { |
| 257 |
$this->flush_inline(); |
| 258 |
} |
| 259 |
$this->list_stack[] = [ |
| 260 |
'type' => $tag, |
| 261 |
'index' => 1, |
| 262 |
]; |
| 263 |
return; |
| 264 |
|
| 265 |
case 'li': |
| 266 |
$this->flush_inline(); |
| 267 |
return; |
| 268 |
|
| 269 |
case 'blockquote': |
| 270 |
$this->flush_inline(); |
| 271 |
$this->blockquote_depth++; |
| 272 |
return; |
| 273 |
|
| 274 |
case 'table': |
| 275 |
$this->flush_inline(); |
| 276 |
$this->in_table = true; |
| 277 |
$this->table_headers = []; |
| 278 |
$this->table_rows = []; |
| 279 |
return; |
| 280 |
|
| 281 |
case 'thead': |
| 282 |
$this->in_table_head = true; |
| 283 |
return; |
| 284 |
|
| 285 |
case 'tr': |
| 286 |
if ( ! $this->in_table ) { |
| 287 |
return; |
| 288 |
} |
| 289 |
$this->current_row = []; |
| 290 |
$this->row_is_header = $this->in_table_head; |
| 291 |
return; |
| 292 |
|
| 293 |
case 'th': |
| 294 |
$this->row_is_header = true; |
| 295 |
$this->current_cell = ''; |
| 296 |
return; |
| 297 |
|
| 298 |
case 'td': |
| 299 |
$this->current_cell = ''; |
| 300 |
return; |
| 301 |
} |
| 302 |
} |
| 303 |
|
| 304 |
private function handle_close( string $tag ): void { |
| 305 |
switch ( $tag ) { |
| 306 |
case 'p': |
| 307 |
case 'div': |
| 308 |
case 'section': |
| 309 |
case 'article': |
| 310 |
case 'header': |
| 311 |
case 'footer': |
| 312 |
case 'main': |
| 313 |
case 'aside': |
| 314 |
case 'figure': |
| 315 |
$this->flush_inline(); |
| 316 |
return; |
| 317 |
|
| 318 |
case 'h1': |
| 319 |
case 'h2': |
| 320 |
case 'h3': |
| 321 |
case 'h4': |
| 322 |
case 'h5': |
| 323 |
case 'h6': |
| 324 |
$this->inline_buffer = preg_replace( '/[ \t]+/', ' ', $this->inline_buffer ); |
| 325 |
$this->flush_inline(); |
| 326 |
$this->heading_level = 0; |
| 327 |
return; |
| 328 |
|
| 329 |
case 'strong': |
| 330 |
case 'b': |
| 331 |
$this->append_inline( '**' ); |
| 332 |
return; |
| 333 |
|
| 334 |
case 'em': |
| 335 |
case 'i': |
| 336 |
$this->append_inline( '*' ); |
| 337 |
return; |
| 338 |
|
| 339 |
case 'del': |
| 340 |
case 's': |
| 341 |
case 'strike': |
| 342 |
$this->append_inline( '~~' ); |
| 343 |
return; |
| 344 |
|
| 345 |
case 'code': |
| 346 |
if ( $this->in_pre ) { |
| 347 |
return; |
| 348 |
} |
| 349 |
$this->append_inline( '`CODE_CLOSE`' ); |
| 350 |
$this->in_code = false; |
| 351 |
return; |
| 352 |
|
| 353 |
case 'pre': |
| 354 |
$this->emit_pre(); |
| 355 |
$this->in_pre = false; |
| 356 |
$this->pre_buffer = ''; |
| 357 |
$this->pre_language = ''; |
| 358 |
return; |
| 359 |
|
| 360 |
case 'a': |
| 361 |
$this->emit_link(); |
| 362 |
$this->in_link = false; |
| 363 |
$this->link_href = ''; |
| 364 |
$this->link_buffer = ''; |
| 365 |
return; |
| 366 |
|
| 367 |
case 'ul': |
| 368 |
case 'ol': |
| 369 |
$this->flush_inline(); |
| 370 |
array_pop( $this->list_stack ); |
| 371 |
if ( empty( $this->list_stack ) ) { |
| 372 |
$this->output .= "\n\n"; |
| 373 |
} |
| 374 |
return; |
| 375 |
|
| 376 |
case 'li': |
| 377 |
$this->emit_list_item(); |
| 378 |
return; |
| 379 |
|
| 380 |
case 'blockquote': |
| 381 |
$this->flush_inline(); |
| 382 |
$this->blockquote_depth = max( 0, $this->blockquote_depth - 1 ); |
| 383 |
if ( 0 === $this->blockquote_depth ) { |
| 384 |
$this->output .= "\n"; |
| 385 |
} |
| 386 |
return; |
| 387 |
|
| 388 |
case 'table': |
| 389 |
$this->emit_table(); |
| 390 |
$this->in_table = false; |
| 391 |
$this->table_headers = []; |
| 392 |
$this->table_rows = []; |
| 393 |
return; |
| 394 |
|
| 395 |
case 'thead': |
| 396 |
$this->in_table_head = false; |
| 397 |
return; |
| 398 |
|
| 399 |
case 'tr': |
| 400 |
if ( ! $this->in_table ) { |
| 401 |
return; |
| 402 |
} |
| 403 |
if ( $this->row_is_header && empty( $this->table_headers ) ) { |
| 404 |
$this->table_headers = $this->current_row; |
| 405 |
} else { |
| 406 |
$this->table_rows[] = $this->current_row; |
| 407 |
} |
| 408 |
$this->current_row = []; |
| 409 |
$this->row_is_header = false; |
| 410 |
return; |
| 411 |
|
| 412 |
case 'th': |
| 413 |
case 'td': |
| 414 |
$this->current_row[] = trim( preg_replace( '/\s+/', ' ', $this->current_cell ) ); |
| 415 |
$this->current_cell = ''; |
| 416 |
return; |
| 417 |
} |
| 418 |
} |
| 419 |
|
| 420 |
private function append_inline( string $marker ): void { |
| 421 |
if ( $this->in_link ) { |
| 422 |
$this->link_buffer .= $marker; |
| 423 |
return; |
| 424 |
} |
| 425 |
|
| 426 |
$this->inline_buffer .= $marker; |
| 427 |
} |
| 428 |
|
| 429 |
private function emit_link(): void { |
| 430 |
$text = $this->link_buffer; |
| 431 |
$href = $this->link_href; |
| 432 |
|
| 433 |
if ( '' === $href || '#' === $href ) { |
| 434 |
$this->inline_buffer .= $text; |
| 435 |
return; |
| 436 |
} |
| 437 |
|
| 438 |
if ( ! $this->is_safe_url( $href ) ) { |
| 439 |
$this->inline_buffer .= $text; |
| 440 |
return; |
| 441 |
} |
| 442 |
|
| 443 |
$href = $this->escape_url_for_markdown( $href ); |
| 444 |
|
| 445 |
$this->inline_buffer .= '[' . $text . '](' . $href . ')'; |
| 446 |
} |
| 447 |
|
| 448 |
private function emit_image( WP_HTML_Processor $p ): void { |
| 449 |
$src = (string) $p->get_attribute( 'src' ); |
| 450 |
$alt = (string) $p->get_attribute( 'alt' ); |
| 451 |
|
| 452 |
if ( '' === $src ) { |
| 453 |
return; |
| 454 |
} |
| 455 |
|
| 456 |
if ( ! $this->is_safe_url( $src ) ) { |
| 457 |
return; |
| 458 |
} |
| 459 |
|
| 460 |
$alt = $this->escape_text( $alt, false ); |
| 461 |
$src = $this->escape_url_for_markdown( $src ); |
| 462 |
|
| 463 |
$this->inline_buffer .= ''; |
| 464 |
} |
| 465 |
|
| 466 |
private function emit_pre(): void { |
| 467 |
$content = html_entity_decode( $this->pre_buffer, ENT_QUOTES, 'UTF-8' ); |
| 468 |
$content = rtrim( $content, "\n" ); |
| 469 |
|
| 470 |
$this->output .= "\n\n```" . $this->pre_language . "\n" . $content . "\n```\n\n"; |
| 471 |
} |
| 472 |
|
| 473 |
private function emit_list_item(): void { |
| 474 |
$content = trim( $this->inline_buffer ); |
| 475 |
$this->inline_buffer = ''; |
| 476 |
|
| 477 |
if ( '' === $content ) { |
| 478 |
return; |
| 479 |
} |
| 480 |
|
| 481 |
$top = end( $this->list_stack ); |
| 482 |
|
| 483 |
if ( false === $top ) { |
| 484 |
$this->output .= $content . "\n"; |
| 485 |
return; |
| 486 |
} |
| 487 |
|
| 488 |
$depth = count( $this->list_stack ) - 1; |
| 489 |
$indent = str_repeat( ' ', $depth ); |
| 490 |
|
| 491 |
if ( 'ol' === $top['type'] ) { |
| 492 |
$marker = $top['index'] . '. '; |
| 493 |
$this->list_stack[ array_key_last( $this->list_stack ) ]['index']++; |
| 494 |
} else { |
| 495 |
$marker = '- '; |
| 496 |
} |
| 497 |
|
| 498 |
$lines = explode( "\n", $content ); |
| 499 |
$first = array_shift( $lines ); |
| 500 |
$rendered = $indent . $marker . $first; |
| 501 |
|
| 502 |
foreach ( $lines as $line ) { |
| 503 |
$rendered .= "\n" . $indent . ' ' . $line; |
| 504 |
} |
| 505 |
|
| 506 |
$this->output .= $this->prefix_blockquote( $rendered ) . "\n"; |
| 507 |
} |
| 508 |
|
| 509 |
private function emit_table(): void { |
| 510 |
if ( empty( $this->table_headers ) && empty( $this->table_rows ) ) { |
| 511 |
return; |
| 512 |
} |
| 513 |
|
| 514 |
if ( empty( $this->table_headers ) && ! empty( $this->table_rows ) ) { |
| 515 |
$this->table_headers = array_fill( 0, count( $this->table_rows[0] ), '' ); |
| 516 |
} |
| 517 |
|
| 518 |
$column_count = count( $this->table_headers ); |
| 519 |
$lines = []; |
| 520 |
$lines[] = '| ' . implode( ' | ', array_map( [ $this, 'escape_table_cell' ], $this->table_headers ) ) . ' |'; |
| 521 |
$lines[] = '|' . str_repeat( ' --- |', $column_count ); |
| 522 |
|
| 523 |
foreach ( $this->table_rows as $row ) { |
| 524 |
$row = array_pad( $row, $column_count, '' ); |
| 525 |
$row = array_slice( $row, 0, $column_count ); |
| 526 |
$lines[] = '| ' . implode( ' | ', array_map( [ $this, 'escape_table_cell' ], $row ) ) . ' |'; |
| 527 |
} |
| 528 |
|
| 529 |
$this->output .= "\n\n" . implode( "\n", $lines ) . "\n\n"; |
| 530 |
} |
| 531 |
|
| 532 |
private function escape_table_cell( string $value ): string { |
| 533 |
return str_replace( [ '|', "\n" ], [ '\\|', ' ' ], $value ); |
| 534 |
} |
| 535 |
|
| 536 |
private function flush_inline(): void { |
| 537 |
if ( '' === $this->inline_buffer ) { |
| 538 |
return; |
| 539 |
} |
| 540 |
|
| 541 |
$content = $this->finalize_inline( $this->inline_buffer ); |
| 542 |
$this->inline_buffer = ''; |
| 543 |
|
| 544 |
$content = trim( $content ); |
| 545 |
|
| 546 |
if ( '' === $content ) { |
| 547 |
return; |
| 548 |
} |
| 549 |
|
| 550 |
if ( ! empty( $this->list_stack ) ) { |
| 551 |
$this->inline_buffer = $content; |
| 552 |
return; |
| 553 |
} |
| 554 |
|
| 555 |
$content = $this->prefix_blockquote( $content ); |
| 556 |
|
| 557 |
$this->output .= "\n\n" . $content . "\n\n"; |
| 558 |
} |
| 559 |
|
| 560 |
private function finalize_inline( string $buffer ): string { |
| 561 |
return preg_replace_callback( |
| 562 |
'/`CODE_OPEN`(.*?)`CODE_CLOSE`/s', |
| 563 |
function ( $matches ) { |
| 564 |
return $this->render_inline_code( $matches[1] ); |
| 565 |
}, |
| 566 |
$buffer |
| 567 |
); |
| 568 |
} |
| 569 |
|
| 570 |
private function render_inline_code( string $content ): string { |
| 571 |
$content = preg_replace( '/\s+/', ' ', $content ); |
| 572 |
|
| 573 |
preg_match_all( '/`+/', $content, $runs ); |
| 574 |
$max = 0; |
| 575 |
|
| 576 |
foreach ( $runs[0] as $run ) { |
| 577 |
$max = max( $max, strlen( $run ) ); |
| 578 |
} |
| 579 |
|
| 580 |
$fence = str_repeat( '`', $max + 1 ); |
| 581 |
$pad = ( '' !== $content && ( '`' === $content[0] || '`' === substr( $content, -1 ) ) ) ? ' ' : ''; |
| 582 |
|
| 583 |
return $fence . $pad . $content . $pad . $fence; |
| 584 |
} |
| 585 |
|
| 586 |
private function prefix_blockquote( string $content ): string { |
| 587 |
if ( 0 === $this->blockquote_depth ) { |
| 588 |
return $content; |
| 589 |
} |
| 590 |
|
| 591 |
$prefix = str_repeat( '> ', $this->blockquote_depth ); |
| 592 |
$lines = explode( "\n", $content ); |
| 593 |
|
| 594 |
return implode( "\n", array_map( |
| 595 |
function ( $line ) use ( $prefix ) { |
| 596 |
return $prefix . $line; |
| 597 |
}, |
| 598 |
$lines |
| 599 |
) ); |
| 600 |
} |
| 601 |
|
| 602 |
private function escape_text( string $text, bool $in_code ): string { |
| 603 |
$text = html_entity_decode( $text, ENT_QUOTES, 'UTF-8' ); |
| 604 |
|
| 605 |
if ( $in_code ) { |
| 606 |
return $text; |
| 607 |
} |
| 608 |
|
| 609 |
$replacements = []; |
| 610 |
|
| 611 |
foreach ( self::ESCAPABLE_MARKDOWN_CHARS as $char ) { |
| 612 |
$replacements[ $char ] = '\\' . $char; |
| 613 |
} |
| 614 |
|
| 615 |
return strtr( $text, $replacements ); |
| 616 |
} |
| 617 |
|
| 618 |
private function escape_url_for_markdown( string $url ): string { |
| 619 |
return strtr( $url, [ |
| 620 |
' ' => '%20', |
| 621 |
'(' => '%28', |
| 622 |
')' => '%29', |
| 623 |
'<' => '%3C', |
| 624 |
'>' => '%3E', |
| 625 |
] ); |
| 626 |
} |
| 627 |
|
| 628 |
private function is_safe_url( string $url ): bool { |
| 629 |
$url = trim( $url ); |
| 630 |
|
| 631 |
if ( '' === $url ) { |
| 632 |
return false; |
| 633 |
} |
| 634 |
|
| 635 |
if ( '#' === $url[0] || '/' === $url[0] || '?' === $url[0] ) { |
| 636 |
return true; |
| 637 |
} |
| 638 |
|
| 639 |
$lower = strtolower( $url ); |
| 640 |
|
| 641 |
foreach ( self::SAFE_DATA_PREFIXES as $prefix ) { |
| 642 |
if ( 0 === strpos( $lower, $prefix ) ) { |
| 643 |
return true; |
| 644 |
} |
| 645 |
} |
| 646 |
|
| 647 |
if ( ! preg_match( '#^([a-z][a-z0-9+.\-]*):#i', $url, $m ) ) { |
| 648 |
return true; |
| 649 |
} |
| 650 |
|
| 651 |
return in_array( strtolower( $m[1] ), self::SAFE_URL_SCHEMES, true ); |
| 652 |
} |
| 653 |
} |
| 654 |
|
