| 1 |
<?php |
| 2 |
|
| 3 |
// If this file is called directly, abort. |
| 4 |
if ( ! defined( 'WPINC' ) ) { |
| 5 |
die; |
| 6 |
} |
| 7 |
|
| 8 |
|
| 9 |
/** |
| 10 |
* Add hreflang alternate links to XML sitemap for multilingual support. |
| 11 |
* |
| 12 |
* @param string $content The original XML sitemap content. |
| 13 |
* @return string The modified XML content with added xhtml:link alternate tags. |
| 14 |
*/ |
| 15 |
function wplng_sitemap_add_hreflang_links( $content ) { |
| 16 |
|
| 17 |
// Return the content as is if it's empty or not valid XML. |
| 18 |
if ( empty( $content ) || ! wplng_str_is_xml( $content ) ) { |
| 19 |
return $content; |
| 20 |
} |
| 21 |
|
| 22 |
// Get language data. |
| 23 |
$language_website_id = wplng_get_language_website_id(); |
| 24 |
$languages_target_ids = wplng_get_languages_target_ids(); |
| 25 |
|
| 26 |
if ( empty( $language_website_id ) || empty( $languages_target_ids ) ) { |
| 27 |
return $content; |
| 28 |
} |
| 29 |
|
| 30 |
// Load the XML content into a DOMDocument. |
| 31 |
$dom = new DOMDocument( '1.0', 'UTF-8' ); |
| 32 |
$dom->preserveWhiteSpace = false; |
| 33 |
$dom->formatOutput = true; |
| 34 |
|
| 35 |
// Enable internal error handling |
| 36 |
$previous_libxml_setting = libxml_use_internal_errors( true ); |
| 37 |
|
| 38 |
// Check XML errors |
| 39 |
if ( ! $dom->loadXML( $content ) ) { |
| 40 |
if ( defined( 'WPLNG_DEBUG_XML' ) && true === WPLNG_DEBUG_XML ) { |
| 41 |
$errors = array(); |
| 42 |
|
| 43 |
foreach ( libxml_get_errors() as $error ) { |
| 44 |
$errors[] = $error->message; |
| 45 |
} |
| 46 |
|
| 47 |
libxml_clear_errors(); |
| 48 |
|
| 49 |
$debug = array( |
| 50 |
'title' => 'wpLingua XML debug - Invalid XML content', |
| 51 |
'errors' => $errors, |
| 52 |
); |
| 53 |
|
| 54 |
error_log( var_export( $debug, true ) ); |
| 55 |
} |
| 56 |
|
| 57 |
return $content; |
| 58 |
} |
| 59 |
|
| 60 |
// Restore previous setting |
| 61 |
libxml_use_internal_errors( $previous_libxml_setting ); |
| 62 |
|
| 63 |
// Replace XSL stylesheet URL if option enabled |
| 64 |
if ( get_option( 'wplng_sitemap_xsl_override', false ) ) { |
| 65 |
$wplng_xsl_url = plugins_url( 'assets/sitemap.xsl', __DIR__ ); |
| 66 |
|
| 67 |
// Find existing xml-stylesheet processing instruction |
| 68 |
$xsl_found = false; |
| 69 |
foreach ( $dom->childNodes as $node ) { |
| 70 |
if ( $node->nodeType === XML_PI_NODE && $node->target === 'xml-stylesheet' ) { |
| 71 |
$node->data = 'type="text/xsl" href="' . esc_url( $wplng_xsl_url ) . '"'; |
| 72 |
$xsl_found = true; |
| 73 |
break; |
| 74 |
} |
| 75 |
} |
| 76 |
|
| 77 |
// If no xml-stylesheet found, add one before the root element |
| 78 |
if ( ! $xsl_found ) { |
| 79 |
$xsl_pi = $dom->createProcessingInstruction( |
| 80 |
'xml-stylesheet', |
| 81 |
'type="text/xsl" href="' . esc_url( $wplng_xsl_url ) . '"' |
| 82 |
); |
| 83 |
$dom->insertBefore( $xsl_pi, $dom->documentElement ); |
| 84 |
} |
| 85 |
} |
| 86 |
|
| 87 |
$signature = '<!-- XML Sitemap is made multilingual by wpLingua -->' . PHP_EOL; |
| 88 |
|
| 89 |
// Register namespaces and prepare XPath. |
| 90 |
$xpath = new DOMXPath( $dom ); |
| 91 |
$xpath->registerNamespace( 'sm', 'http://www.sitemaps.org/schemas/sitemap/0.9' ); |
| 92 |
$xpath->registerNamespace( 'xhtml', 'http://www.w3.org/1999/xhtml' ); |
| 93 |
|
| 94 |
// Ensure the root element declares the required namespaces. |
| 95 |
$urlset = $dom->documentElement; |
| 96 |
if ( ! $urlset->hasAttribute( 'xmlns' ) ) { |
| 97 |
$urlset->setAttribute( 'xmlns', 'http://www.sitemaps.org/schemas/sitemap/0.9' ); |
| 98 |
} |
| 99 |
if ( ! $urlset->hasAttribute( 'xmlns:xhtml' ) ) { |
| 100 |
$urlset->setAttribute( 'xmlns:xhtml', 'http://www.w3.org/1999/xhtml' ); |
| 101 |
} |
| 102 |
|
| 103 |
// Get all <url> nodes. |
| 104 |
$url_nodes = $xpath->query( '//sm:url' ); |
| 105 |
|
| 106 |
if ( empty( $url_nodes ) ) { |
| 107 |
return $dom->saveXML() . $signature; |
| 108 |
} |
| 109 |
|
| 110 |
foreach ( $url_nodes as $url_node ) { |
| 111 |
|
| 112 |
// Get original URL. |
| 113 |
$loc_node = $xpath->query( 'sm:loc', $url_node )->item( 0 ); |
| 114 |
|
| 115 |
if ( empty( $loc_node ) ) { |
| 116 |
continue; |
| 117 |
} |
| 118 |
|
| 119 |
$url_original = trim( $loc_node->nodeValue ); |
| 120 |
|
| 121 |
if ( '' === $url_original || ! wplng_url_is_translatable( $url_original ) ) { |
| 122 |
continue; |
| 123 |
} |
| 124 |
|
| 125 |
// Add link for original language. |
| 126 |
$link_node = $dom->createElement( 'xhtml:link' ); |
| 127 |
$link_node->setAttribute( 'rel', 'alternate' ); |
| 128 |
$link_node->setAttribute( 'hreflang', esc_attr( $language_website_id ) ); |
| 129 |
$link_node->setAttribute( 'href', esc_url( $url_original ) ); |
| 130 |
$url_node->appendChild( $link_node ); |
| 131 |
|
| 132 |
// Add links for target languages. |
| 133 |
foreach ( $languages_target_ids as $language_id ) { |
| 134 |
|
| 135 |
$translated_url = wplng_url_translate( |
| 136 |
$url_original, |
| 137 |
$language_id |
| 138 |
); |
| 139 |
|
| 140 |
// Validate the translated URL. |
| 141 |
if ( empty( $translated_url ) |
| 142 |
|| ! filter_var( $translated_url, FILTER_VALIDATE_URL ) |
| 143 |
) { |
| 144 |
continue; |
| 145 |
} |
| 146 |
|
| 147 |
$link_node = $dom->createElement( 'xhtml:link' ); |
| 148 |
$link_node->setAttribute( 'rel', 'alternate' ); |
| 149 |
$link_node->setAttribute( 'hreflang', esc_attr( $language_id ) ); |
| 150 |
$link_node->setAttribute( 'href', esc_url( $translated_url ) ); |
| 151 |
$url_node->appendChild( $link_node ); |
| 152 |
} |
| 153 |
} |
| 154 |
|
| 155 |
$sitemap = $dom->saveXML(); |
| 156 |
|
| 157 |
if ( empty( $sitemap ) ) { |
| 158 |
return $content; |
| 159 |
} |
| 160 |
|
| 161 |
return $sitemap . $signature; |
| 162 |
} |
| 163 |
|
| 164 |
|
| 165 |
/** |
| 166 |
* Modify XSL stylesheet to display translated links in sitemap. |
| 167 |
* |
| 168 |
* @param string $content The original XSL content. |
| 169 |
* @return string The modified XSL content with translations displayed under each URL. |
| 170 |
*/ |
| 171 |
function wplng_sitemap_modify_xsl( $content ) { |
| 172 |
|
| 173 |
if ( empty( $content ) ) { |
| 174 |
return $content; |
| 175 |
} |
| 176 |
|
| 177 |
// Check if this XSL already has translations support |
| 178 |
if ( wplng_str_contains( $content, 'wplng-translations' ) ) { |
| 179 |
return $content; |
| 180 |
} |
| 181 |
|
| 182 |
// Load XSL into DOMDocument |
| 183 |
$dom = new DOMDocument( '1.0', 'UTF-8' ); |
| 184 |
$dom->preserveWhiteSpace = false; |
| 185 |
$dom->formatOutput = true; |
| 186 |
|
| 187 |
// Enable internal error handling |
| 188 |
$previous_libxml_setting = libxml_use_internal_errors( true ); |
| 189 |
|
| 190 |
if ( ! $dom->loadXML( $content ) ) { |
| 191 |
libxml_clear_errors(); |
| 192 |
libxml_use_internal_errors( $previous_libxml_setting ); |
| 193 |
return $content; |
| 194 |
} |
| 195 |
|
| 196 |
libxml_use_internal_errors( $previous_libxml_setting ); |
| 197 |
|
| 198 |
$xpath = new DOMXPath( $dom ); |
| 199 |
$xpath->registerNamespace( 'xsl', 'http://www.w3.org/1999/XSL/Transform' ); |
| 200 |
|
| 201 |
// Add xhtml namespace to xsl:stylesheet if not present |
| 202 |
$stylesheet = $dom->documentElement; |
| 203 |
if ( ! $stylesheet->hasAttribute( 'xmlns:xhtml' ) ) { |
| 204 |
$stylesheet->setAttribute( 'xmlns:xhtml', 'http://www.w3.org/1999/xhtml' ); |
| 205 |
} |
| 206 |
|
| 207 |
// Add CSS to existing <style> element or create one in <head> |
| 208 |
$css = ' |
| 209 |
.wplng-translations { margin-top: 8px; padding-top: 8px; border-top: 1px dashed #ddd; } |
| 210 |
.wplng-translation-row { display: block; margin: 4px 0; font-size: 13px; } |
| 211 |
.wplng-lang-badge { display: inline-block; min-width: 24px; padding: 2px 6px; margin-right: 8px; background: #0073aa; color: white; border-radius: 3px; font-size: 11px; text-align: center; font-weight: bold; } |
| 212 |
.wplng-translation-row a { color: #0073aa; text-decoration: none; } |
| 213 |
.wplng-translation-row a:hover { text-decoration: underline; } |
| 214 |
.wplng-credit { margin-top: 20px; padding: 10px; background: #f5f5f5; border-radius: 4px; font-size: 12px; color: #666; text-align: center; } |
| 215 |
.wplng-credit a { color: #0073aa; } |
| 216 |
'; |
| 217 |
|
| 218 |
$style_nodes = $xpath->query( '//style' ); |
| 219 |
if ( $style_nodes->length > 0 ) { |
| 220 |
$style_node = $style_nodes->item( 0 ); |
| 221 |
$style_node->nodeValue .= $css; |
| 222 |
} else { |
| 223 |
$head_nodes = $xpath->query( '//head' ); |
| 224 |
if ( $head_nodes->length > 0 ) { |
| 225 |
$style_element = $dom->createElement( 'style', $css ); |
| 226 |
$head_nodes->item( 0 )->appendChild( $style_element ); |
| 227 |
} |
| 228 |
} |
| 229 |
|
| 230 |
// Create the XSL fragment for translations |
| 231 |
$xsl_ns = 'http://www.w3.org/1999/XSL/Transform'; |
| 232 |
|
| 233 |
// Find the <td> containing the URL (class="loc" or containing sitemap:loc) |
| 234 |
$loc_cells = $xpath->query( '//td[contains(@class, "loc")]' ); |
| 235 |
|
| 236 |
if ( $loc_cells->length > 0 ) { |
| 237 |
$loc_cell = $loc_cells->item( 0 ); |
| 238 |
|
| 239 |
// Create xsl:if element |
| 240 |
$xsl_if = $dom->createElementNS( $xsl_ns, 'xsl:if' ); |
| 241 |
$xsl_if->setAttribute( 'test', "xhtml:link[@rel='alternate']" ); |
| 242 |
|
| 243 |
// Create wrapper div |
| 244 |
$div = $dom->createElement( 'div' ); |
| 245 |
$div->setAttribute( 'class', 'wplng-translations' ); |
| 246 |
|
| 247 |
// Create xsl:for-each element |
| 248 |
$xsl_foreach = $dom->createElementNS( $xsl_ns, 'xsl:for-each' ); |
| 249 |
$xsl_foreach->setAttribute( 'select', "xhtml:link[@rel='alternate']" ); |
| 250 |
|
| 251 |
// Create span.wplng-translation-row |
| 252 |
$span_row = $dom->createElement( 'span' ); |
| 253 |
$span_row->setAttribute( 'class', 'wplng-translation-row' ); |
| 254 |
|
| 255 |
// Create span.wplng-lang-badge with xsl:value-of |
| 256 |
$span_badge = $dom->createElement( 'span' ); |
| 257 |
$span_badge->setAttribute( 'class', 'wplng-lang-badge' ); |
| 258 |
$xsl_value_lang = $dom->createElementNS( $xsl_ns, 'xsl:value-of' ); |
| 259 |
$xsl_value_lang->setAttribute( 'select', '@hreflang' ); |
| 260 |
$span_badge->appendChild( $xsl_value_lang ); |
| 261 |
|
| 262 |
// Create anchor element |
| 263 |
$anchor = $dom->createElement( 'a' ); |
| 264 |
$anchor->setAttribute( 'href', '{@href}' ); |
| 265 |
$xsl_value_href = $dom->createElementNS( $xsl_ns, 'xsl:value-of' ); |
| 266 |
$xsl_value_href->setAttribute( 'select', '@href' ); |
| 267 |
$anchor->appendChild( $xsl_value_href ); |
| 268 |
|
| 269 |
// Assemble the structure |
| 270 |
$span_row->appendChild( $span_badge ); |
| 271 |
$span_row->appendChild( $anchor ); |
| 272 |
$xsl_foreach->appendChild( $span_row ); |
| 273 |
$div->appendChild( $xsl_foreach ); |
| 274 |
$xsl_if->appendChild( $div ); |
| 275 |
|
| 276 |
// Append to loc cell |
| 277 |
$loc_cell->appendChild( $xsl_if ); |
| 278 |
} |
| 279 |
|
| 280 |
// Add credit message to the page footer |
| 281 |
$body_nodes = $xpath->query( '//body' ); |
| 282 |
if ( $body_nodes->length > 0 ) { |
| 283 |
$body = $body_nodes->item( 0 ); |
| 284 |
|
| 285 |
// Find the main container div or append to body |
| 286 |
$container_nodes = $xpath->query( '//div[@id="sitemap"] | //div[@id="content"] | //div[contains(@class, "sitemap")]' ); |
| 287 |
$target = ( $container_nodes->length > 0 ) ? $container_nodes->item( 0 ) : $body; |
| 288 |
|
| 289 |
$credit_div = $dom->createElement( 'p' ); |
| 290 |
$credit_div->setAttribute( 'class', 'wplng-credit' ); |
| 291 |
|
| 292 |
$credit_text = $dom->createTextNode( 'Multilingual sitemap powered by ' ); |
| 293 |
$credit_div->appendChild( $credit_text ); |
| 294 |
|
| 295 |
$credit_link = $dom->createElement( 'a', 'wpLingua' ); |
| 296 |
$credit_link->setAttribute( 'href', 'https://wplingua.com' ); |
| 297 |
$credit_link->setAttribute( 'target', '_blank' ); |
| 298 |
$credit_link->setAttribute( 'rel', 'noopener' ); |
| 299 |
$credit_div->appendChild( $credit_link ); |
| 300 |
|
| 301 |
$target->appendChild( $credit_div ); |
| 302 |
} |
| 303 |
|
| 304 |
$result = $dom->saveXML(); |
| 305 |
|
| 306 |
if ( empty( $result ) ) { |
| 307 |
return $content; |
| 308 |
} |
| 309 |
|
| 310 |
// Add XML comment at the end |
| 311 |
$result .= PHP_EOL . '<!-- XSL Sitemap stylesheet is made multilingual by wpLingua -->'; |
| 312 |
|
| 313 |
return $result; |
| 314 |
} |
| 315 |
|
| 316 |
|
| 317 |
/** |
| 318 |
* Filter All In One SEO sitemap post entries to add multilingual alternate URLs. |
| 319 |
* |
| 320 |
* @param array $entry The sitemap entry data. |
| 321 |
* @param int $post_id The post ID. |
| 322 |
* @return array The modified sitemap entry with language alternatives. |
| 323 |
*/ |
| 324 |
function wplng_aioseo_filter_sitemap_post( $entry, $post_id ) { |
| 325 |
|
| 326 |
// Get the post URL |
| 327 |
$post_url = get_permalink( $post_id ); |
| 328 |
|
| 329 |
if ( empty( $post_url ) || ! wplng_url_is_translatable( $post_url ) ) { |
| 330 |
return $entry; |
| 331 |
} |
| 332 |
|
| 333 |
// Get language data |
| 334 |
$language_website_id = wplng_get_language_website_id(); |
| 335 |
$languages_target_ids = wplng_get_languages_target_ids(); |
| 336 |
|
| 337 |
if ( empty( $language_website_id ) || empty( $languages_target_ids ) ) { |
| 338 |
return $entry; |
| 339 |
} |
| 340 |
|
| 341 |
// Set the main language |
| 342 |
$entry['language'] = $language_website_id; |
| 343 |
|
| 344 |
// Add translated versions (including original language for self-reference) |
| 345 |
$entry['languages'] = array(); |
| 346 |
|
| 347 |
// Add original language (self-referencing hreflang) |
| 348 |
$entry['languages'][] = array( |
| 349 |
'language' => $language_website_id, |
| 350 |
'location' => $post_url, |
| 351 |
); |
| 352 |
|
| 353 |
foreach ( $languages_target_ids as $language_id ) { |
| 354 |
$translated_url = wplng_url_translate( $post_url, $language_id ); |
| 355 |
|
| 356 |
if ( ! empty( $translated_url ) && filter_var( $translated_url, FILTER_VALIDATE_URL ) ) { |
| 357 |
$entry['languages'][] = array( |
| 358 |
'language' => $language_id, |
| 359 |
'location' => $translated_url, |
| 360 |
); |
| 361 |
} |
| 362 |
} |
| 363 |
|
| 364 |
return $entry; |
| 365 |
} |
| 366 |
|
| 367 |
|
| 368 |
/** |
| 369 |
* Filter All In One SEO sitemap term entries to add multilingual alternate URLs. |
| 370 |
* |
| 371 |
* @param array $entry The sitemap entry data. |
| 372 |
* @param int $term_id The term ID. |
| 373 |
* @return array The modified sitemap entry with language alternatives. |
| 374 |
*/ |
| 375 |
function wplng_aioseo_filter_sitemap_term( $entry, $term_id ) { |
| 376 |
|
| 377 |
// Get the term object |
| 378 |
$term = get_term( $term_id ); |
| 379 |
|
| 380 |
if ( is_wp_error( $term ) || empty( $term ) ) { |
| 381 |
return $entry; |
| 382 |
} |
| 383 |
|
| 384 |
// Get the term URL |
| 385 |
$term_url = get_term_link( $term ); |
| 386 |
|
| 387 |
if ( is_wp_error( $term_url ) || empty( $term_url ) || ! wplng_url_is_translatable( $term_url ) ) { |
| 388 |
return $entry; |
| 389 |
} |
| 390 |
|
| 391 |
// Get language data |
| 392 |
$language_website_id = wplng_get_language_website_id(); |
| 393 |
$languages_target_ids = wplng_get_languages_target_ids(); |
| 394 |
|
| 395 |
if ( empty( $language_website_id ) || empty( $languages_target_ids ) ) { |
| 396 |
return $entry; |
| 397 |
} |
| 398 |
|
| 399 |
// Set the main language |
| 400 |
$entry['language'] = $language_website_id; |
| 401 |
|
| 402 |
// Add translated versions (including original language for self-reference) |
| 403 |
$entry['languages'] = array(); |
| 404 |
|
| 405 |
// Add original language (self-referencing hreflang) |
| 406 |
$entry['languages'][] = array( |
| 407 |
'language' => $language_website_id, |
| 408 |
'location' => $term_url, |
| 409 |
); |
| 410 |
|
| 411 |
foreach ( $languages_target_ids as $language_id ) { |
| 412 |
$translated_url = wplng_url_translate( $term_url, $language_id ); |
| 413 |
|
| 414 |
if ( ! empty( $translated_url ) && filter_var( $translated_url, FILTER_VALIDATE_URL ) ) { |
| 415 |
$entry['languages'][] = array( |
| 416 |
'language' => $language_id, |
| 417 |
'location' => $translated_url, |
| 418 |
); |
| 419 |
} |
| 420 |
} |
| 421 |
|
| 422 |
return $entry; |
| 423 |
} |
| 424 |
|
