| 1 |
<?php |
| 2 |
/** |
| 3 |
* Foreign JSON-LD detector. |
| 4 |
* |
| 5 |
* @package ThinkRank\Diagnostics |
| 6 |
*/ |
| 7 |
|
| 8 |
declare(strict_types=1); |
| 9 |
|
| 10 |
namespace ThinkRank\Diagnostics; |
| 11 |
|
| 12 |
use ThinkRank\Core\SEO_Plugin_Detector; |
| 13 |
|
| 14 |
if (!defined('ABSPATH')) { |
| 15 |
exit; |
| 16 |
} |
| 17 |
|
| 18 |
/** |
| 19 |
* Finds JSON-LD on a rendered page that ThinkRank did not emit. |
| 20 |
* |
| 21 |
* #355 gave ThinkRank a single arbitrated `@graph` so its own emitters stop |
| 22 |
* contradicting each other on one URL. Nothing arbitrates against schema |
| 23 |
* produced by *other* plugins: when a second schema-producing plugin is active |
| 24 |
* both publish page-level entities for the same URL with no coordination, which |
| 25 |
* is the same failure #355 closed, only sourced externally (#447). |
| 26 |
* |
| 27 |
* This class detects that and nothing else. It warns; it never merges ThinkRank's |
| 28 |
* output into another plugin's graph and never suppresses the other plugin's |
| 29 |
* output. Merging is deliberately out of scope: ThinkRank is the primary SEO |
| 30 |
* plugin, and building for two active ones would endorse a configuration we do |
| 31 |
* not want users in and mean tracking competitors' graph structures as they change. |
| 32 |
* |
| 33 |
* Detection runs on demand from Site Health (see Schema_Conflict_Health_Check), |
| 34 |
* not on every pageview. Buffering the front end to scan it would put the work |
| 35 |
* on every anonymous request, which is how #402 happened. |
| 36 |
* |
| 37 |
* @since 2.9.0 |
| 38 |
*/ |
| 39 |
class Foreign_Schema_Detector { |
| 40 |
|
| 41 |
/** |
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* Transient holding the last scan result. |
| 43 |
*/ |
| 44 |
private const CACHE_KEY = 'thinkrank_foreign_schema_scan'; |
| 45 |
|
| 46 |
/** |
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* Cache TTL in seconds (1 hour). |
| 48 |
*/ |
| 49 |
private const CACHE_TTL = HOUR_IN_SECONDS; |
| 50 |
|
| 51 |
/** |
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* Timeout for the loopback fetch, in seconds. |
| 53 |
*/ |
| 54 |
private const FETCH_TIMEOUT = 10; |
| 55 |
|
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/** |
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* Signatures that attribute a foreign JSON-LD block to a named plugin. |
| 58 |
* |
| 59 |
* `class` matches a token in the script tag's class attribute, which is the |
| 60 |
* strongest signal available — the big four each tag their own block. `comment` |
| 61 |
* matches the HTML comment wrapper a plugin prints around its head output, |
| 62 |
* for the ones that carry no class. |
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* |
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* @var array<string, array{name:string, class:string[], comment:string[]}> |
| 65 |
*/ |
| 66 |
private const SIGNATURES = [ |
| 67 |
'yoast' => [ |
| 68 |
'name' => 'Yoast SEO', |
| 69 |
'class' => ['yoast-schema-graph'], |
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'comment' => ['yoast seo plugin'], |
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], |
| 72 |
'rankmath' => [ |
| 73 |
'name' => 'Rank Math', |
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'class' => ['rank-math-schema', 'rank-math-schema-pro'], |
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'comment' => ['rank math wordpress seo'], |
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], |
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'aioseo' => [ |
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'name' => 'All in One SEO', |
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'class' => ['aioseo-schema'], |
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'comment' => ['all in one seo'], |
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], |
| 82 |
'seopress' => [ |
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'name' => 'SEOPress', |
| 84 |
'class' => ['seopress-schema'], |
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'comment' => ['seopress'], |
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], |
| 87 |
'theseoframework' => [ |
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'name' => 'The SEO Framework', |
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'class' => [], |
| 90 |
'comment' => ['the seo framework'], |
| 91 |
], |
| 92 |
'slimseo' => [ |
| 93 |
'name' => 'Slim SEO', |
| 94 |
'class' => ['slim-seo-schema'], |
| 95 |
'comment' => ['slim seo'], |
| 96 |
], |
| 97 |
'woocommerce' => [ |
| 98 |
'name' => 'WooCommerce', |
| 99 |
'class' => [], |
| 100 |
'comment' => ['woocommerce json-ld'], |
| 101 |
], |
| 102 |
]; |
| 103 |
|
| 104 |
/** |
| 105 |
* Schema types worth warning about when both sides publish one. |
| 106 |
* |
| 107 |
* A duplicated `WebPage` or `Organization` is the conflict users get |
| 108 |
* penalised for. A second `SearchAction` or `ImageObject` is noise, so the |
| 109 |
* notice stays about entities a search engine reconciles per URL. |
| 110 |
* |
| 111 |
* @var string[] |
| 112 |
*/ |
| 113 |
private const PAGE_LEVEL_TYPES = [ |
| 114 |
'Article', |
| 115 |
'BlogPosting', |
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'NewsArticle', |
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'BreadcrumbList', |
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'CollectionPage', |
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'ContactPage', |
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'Event', |
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'FAQPage', |
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'HowTo', |
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'ItemList', |
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'LocalBusiness', |
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'Organization', |
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'Person', |
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'Product', |
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'ProfilePage', |
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'Recipe', |
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'SearchResultsPage', |
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'SoftwareApplication', |
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'VideoObject', |
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'WebPage', |
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'WebSite', |
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]; |
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|
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/** |
| 138 |
* Run a scan, using the cached result when one is fresh. |
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* |
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* @param bool $use_cache Whether a cached result may be returned. |
| 141 |
* @return array<string, mixed> Scan report, see build_report(). |
| 142 |
*/ |
| 143 |
public function scan(bool $use_cache = true): array { |
| 144 |
if ($use_cache) { |
| 145 |
$cached = get_transient(self::CACHE_KEY); |
| 146 |
if (is_array($cached)) { |
| 147 |
return $cached; |
| 148 |
} |
| 149 |
} |
| 150 |
|
| 151 |
$url = $this->representative_url(); |
| 152 |
$html = $this->fetch($url); |
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|
| 154 |
if (is_wp_error($html)) { |
| 155 |
$report = [ |
| 156 |
'scanned_url' => $url, |
| 157 |
'error' => $html->get_error_message(), |
| 158 |
'conflicts' => [], |
| 159 |
'foreign' => [], |
| 160 |
'own_types' => [], |
| 161 |
'checked_at' => time(), |
| 162 |
]; |
| 163 |
} else { |
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$report = $this->analyze($html); |
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$report['scanned_url'] = $url; |
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$report['checked_at'] = time(); |
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} |
| 168 |
|
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set_transient(self::CACHE_KEY, $report, self::CACHE_TTL); |
| 170 |
|
| 171 |
return $report; |
| 172 |
} |
| 173 |
|
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/** |
| 175 |
* Drop the cached scan result. |
| 176 |
* |
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* @return void |
| 178 |
*/ |
| 179 |
public static function flush_cache(): void { |
| 180 |
delete_transient(self::CACHE_KEY); |
| 181 |
} |
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|
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/** |
| 184 |
* Analyse a rendered HTML document for foreign JSON-LD. |
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* |
| 186 |
* Kept separate from the fetch so it can be exercised against a fixture |
| 187 |
* without an HTTP request. |
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* |
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* @param string $html Rendered page HTML. |
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* @return array{conflicts:array, foreign:array, own_types:string[]} |
| 191 |
*/ |
| 192 |
public function analyze(string $html): array { |
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$blocks = $this->extract_blocks($html); |
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$own_types = []; |
| 195 |
$foreign = []; |
| 196 |
|
| 197 |
foreach ($blocks as $block) { |
| 198 |
$types = $this->collect_types($this->decode($block['json'])); |
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|
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if ($block['is_ours']) { |
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$own_types = array_merge($own_types, $types); |
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continue; |
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} |
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|
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$source = $this->attribute($block); |
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|
| 207 |
if (!isset($foreign[$source['slug']])) { |
| 208 |
$foreign[$source['slug']] = [ |
| 209 |
'slug' => $source['slug'], |
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'name' => $source['name'], |
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'guess' => $source['guess'], |
| 212 |
'types' => [], |
| 213 |
'blocks' => 0, |
| 214 |
]; |
| 215 |
} |
| 216 |
|
| 217 |
$foreign[$source['slug']]['types'] = array_merge($foreign[$source['slug']]['types'], $types); |
| 218 |
$foreign[$source['slug']]['blocks']++; |
| 219 |
} |
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|
| 221 |
$own_types = $this->unique_types($own_types); |
| 222 |
$conflicts = []; |
| 223 |
|
| 224 |
foreach ($foreign as $slug => $entry) { |
| 225 |
$entry['types'] = $this->unique_types($entry['types']); |
| 226 |
$foreign[$slug] = $entry; |
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|
| 228 |
$duplicated = array_values(array_intersect( |
| 229 |
$this->page_level_only($own_types), |
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$this->page_level_only($entry['types']) |
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)); |
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|
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if (!empty($duplicated)) { |
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$conflicts[] = [ |
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'slug' => $slug, |
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'name' => $entry['name'], |
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'guess' => $entry['guess'], |
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'duplicated' => $duplicated, |
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]; |
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} |
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} |
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|
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return [ |
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'conflicts' => $conflicts, |
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'foreign' => array_values($foreign), |
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'own_types' => $own_types, |
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]; |
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} |
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|
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/** |
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* Pull every `application/ld+json` block out of a document. |
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* |
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* Regex rather than DOMDocument: the scan runs against whatever a third |
| 254 |
* party emitted, and a malformed document must still yield the blocks that |
| 255 |
* did parse. Each block carries the raw tag and the comment immediately |
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* preceding it, which is what attribution reads. |
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* |
| 258 |
* @param string $html Rendered page HTML. |
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* @return array<int, array{json:string, tag:string, preceding:string, is_ours:bool}> |
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*/ |
| 261 |
private function extract_blocks(string $html): array { |
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$pattern = '#<script\b([^>]*\btype\s*=\s*["\']application/ld\+json["\'][^>]*)>(.*?)</script>#is'; |
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|
| 264 |
if (!preg_match_all($pattern, $html, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) { |
| 265 |
return []; |
| 266 |
} |
| 267 |
|
| 268 |
$blocks = []; |
| 269 |
|
| 270 |
foreach ($matches as $match) { |
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$attributes = $match[1][0]; |
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$offset = (int) $match[0][1]; |
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$preceding = $this->preceding_comment($html, $offset); |
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|
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$blocks[] = [ |
| 276 |
'json' => $match[2][0], |
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'tag' => $attributes, |
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'preceding' => $preceding, |
| 279 |
'is_ours' => $this->is_ours($attributes, $preceding), |
| 280 |
]; |
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} |
| 282 |
|
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return $blocks; |
| 284 |
} |
| 285 |
|
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/** |
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* The HTML comment that ends just before a script block, if any. |
| 288 |
* |
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* Only whitespace may sit between the comment and the tag, so an unrelated |
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* comment further up the head is never treated as the block's label. |
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* |
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* A *closing* comment is not a label. Both ThinkRank and Yoast bracket their |
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* head output in a matched pair, so the text immediately before a block is |
| 294 |
* very often the previous block's `<!-- /… -->` — reading that as the label |
| 295 |
* made every plugin's schema look like ThinkRank's the moment it happened to |
| 296 |
* be printed next. |
| 297 |
* |
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* @param string $html Rendered page HTML. |
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* @param int $offset Byte offset of the script tag. |
| 300 |
* @return string Comment body (without the delimiters), or an empty string. |
| 301 |
*/ |
| 302 |
private function preceding_comment(string $html, int $offset): string { |
| 303 |
$before = rtrim(substr($html, 0, $offset)); |
| 304 |
|
| 305 |
if (substr($before, -3) !== '-->') { |
| 306 |
return ''; |
| 307 |
} |
| 308 |
|
| 309 |
$start = strrpos($before, '<!--'); |
| 310 |
|
| 311 |
if ($start === false) { |
| 312 |
return ''; |
| 313 |
} |
| 314 |
|
| 315 |
$comment = trim(substr($before, $start + 4, -3)); |
| 316 |
|
| 317 |
if ($comment !== '' && $comment[0] === '/') { |
| 318 |
return ''; |
| 319 |
} |
| 320 |
|
| 321 |
return $comment; |
| 322 |
} |
| 323 |
|
| 324 |
/** |
| 325 |
* Whether a JSON-LD block was emitted by ThinkRank or ThinkRank Pro. |
| 326 |
* |
| 327 |
* Two markers, because the plugins have two kinds of emit point. Every |
| 328 |
* block ThinkRank writes from PHP carries a `data-thinkrank*` attribute |
| 329 |
* (`data-thinkrank-custom-schema` on Pro's custom-schema output predates |
| 330 |
* this check and is matched by the same prefix). The graph and Pro's Local |
| 331 |
* SEO output additionally sit inside a named HTML comment, which is kept as |
| 332 |
* a second signal so a site running an older Pro build is not reported as |
| 333 |
* conflicting with itself. |
| 334 |
* |
| 335 |
* @param string $attributes Attribute text from the opening script tag. |
| 336 |
* @param string $preceding Comment immediately before the tag. |
| 337 |
* @return bool |
| 338 |
*/ |
| 339 |
private function is_ours(string $attributes, string $preceding): bool { |
| 340 |
if (stripos($attributes, 'data-thinkrank') !== false) { |
| 341 |
return true; |
| 342 |
} |
| 343 |
|
| 344 |
return $preceding !== '' && stripos($preceding, 'thinkrank') !== false; |
| 345 |
} |
| 346 |
|
| 347 |
/** |
| 348 |
* Name the plugin that emitted a foreign block. |
| 349 |
* |
| 350 |
* Falls back to correlating with the active-plugin list: when exactly one |
| 351 |
* other schema-capable SEO plugin is running, an unattributed block is |
| 352 |
* almost certainly its, and naming it beats telling the user "something on |
| 353 |
* this page". That case is flagged with `guess` so the wording can hedge. |
| 354 |
* |
| 355 |
* @param array{tag:string, preceding:string} $block Parsed block. |
| 356 |
* @return array{slug:string, name:string, guess:bool} |
| 357 |
*/ |
| 358 |
private function attribute(array $block): array { |
| 359 |
$classes = $this->class_tokens($block['tag']); |
| 360 |
$comment = strtolower($block['preceding']); |
| 361 |
|
| 362 |
foreach (self::SIGNATURES as $slug => $signature) { |
| 363 |
foreach ($signature['class'] as $class) { |
| 364 |
if (in_array($class, $classes, true)) { |
| 365 |
return ['slug' => $slug, 'name' => $signature['name'], 'guess' => false]; |
| 366 |
} |
| 367 |
} |
| 368 |
|
| 369 |
foreach ($signature['comment'] as $needle) { |
| 370 |
if ($comment !== '' && strpos($comment, $needle) !== false) { |
| 371 |
return ['slug' => $slug, 'name' => $signature['name'], 'guess' => false]; |
| 372 |
} |
| 373 |
} |
| 374 |
} |
| 375 |
|
| 376 |
$active = $this->other_active_seo_plugins(); |
| 377 |
|
| 378 |
if (count($active) === 1) { |
| 379 |
$slug = array_key_first($active); |
| 380 |
return ['slug' => $slug, 'name' => $active[$slug], 'guess' => true]; |
| 381 |
} |
| 382 |
|
| 383 |
return [ |
| 384 |
'slug' => 'unknown', |
| 385 |
'name' => __('an unidentified plugin or theme', 'thinkrank'), |
| 386 |
'guess' => true, |
| 387 |
]; |
| 388 |
} |
| 389 |
|
| 390 |
/** |
| 391 |
* Active third-party SEO plugins, as slug => display name. |
| 392 |
* |
| 393 |
* @return array<string, string> |
| 394 |
*/ |
| 395 |
private function other_active_seo_plugins(): array { |
| 396 |
$names = []; |
| 397 |
|
| 398 |
foreach (SEO_Plugin_Detector::detect_plugins() as $slug => $plugin) { |
| 399 |
$names[$slug] = (string) ($plugin['name'] ?? $slug); |
| 400 |
} |
| 401 |
|
| 402 |
return $names; |
| 403 |
} |
| 404 |
|
| 405 |
/** |
| 406 |
* Class tokens on a script tag. |
| 407 |
* |
| 408 |
* @param string $attributes Attribute text from the opening script tag. |
| 409 |
* @return string[] |
| 410 |
*/ |
| 411 |
private function class_tokens(string $attributes): array { |
| 412 |
if (!preg_match('#\bclass\s*=\s*["\']([^"\']*)["\']#i', $attributes, $match)) { |
| 413 |
return []; |
| 414 |
} |
| 415 |
|
| 416 |
return preg_split('/\s+/', strtolower(trim($match[1]))) ?: []; |
| 417 |
} |
| 418 |
|
| 419 |
/** |
| 420 |
* Decode a block's JSON, tolerating the shapes emitters actually use. |
| 421 |
* |
| 422 |
* @param string $json Raw script contents. |
| 423 |
* @return array<mixed> Decoded data, or an empty array when unusable. |
| 424 |
*/ |
| 425 |
private function decode(string $json): array { |
| 426 |
$decoded = json_decode(trim($json), true); |
| 427 |
|
| 428 |
return is_array($decoded) ? $decoded : []; |
| 429 |
} |
| 430 |
|
| 431 |
/** |
| 432 |
* Every `@type` in a decoded block. |
| 433 |
* |
| 434 |
* A block may hold a single entity, a bare list of entities, or an object |
| 435 |
* wrapping `@graph`, and `@type` itself may be a string or a list — so the |
| 436 |
* walk is recursive rather than assuming one shape. |
| 437 |
* |
| 438 |
* @param mixed $data Decoded JSON-LD. |
| 439 |
* @return string[] |
| 440 |
*/ |
| 441 |
private function collect_types($data): array { |
| 442 |
if (!is_array($data)) { |
| 443 |
return []; |
| 444 |
} |
| 445 |
|
| 446 |
$types = []; |
| 447 |
|
| 448 |
if (isset($data['@type'])) { |
| 449 |
foreach ((array) $data['@type'] as $type) { |
| 450 |
if (is_string($type) && $type !== '') { |
| 451 |
$types[] = $type; |
| 452 |
} |
| 453 |
} |
| 454 |
} |
| 455 |
|
| 456 |
foreach ($data as $key => $value) { |
| 457 |
if ($key === '@type' || !is_array($value)) { |
| 458 |
continue; |
| 459 |
} |
| 460 |
|
| 461 |
$types = array_merge($types, $this->collect_types($value)); |
| 462 |
} |
| 463 |
|
| 464 |
return $types; |
| 465 |
} |
| 466 |
|
| 467 |
/** |
| 468 |
* Normalise a type list: unique, sorted, empties dropped. |
| 469 |
* |
| 470 |
* @param string[] $types Raw type list. |
| 471 |
* @return string[] |
| 472 |
*/ |
| 473 |
private function unique_types(array $types): array { |
| 474 |
$types = array_values(array_unique(array_filter($types))); |
| 475 |
sort($types); |
| 476 |
|
| 477 |
return $types; |
| 478 |
} |
| 479 |
|
| 480 |
/** |
| 481 |
* Keep only the types a duplicate of which is actually a problem. |
| 482 |
* |
| 483 |
* @param string[] $types Type list. |
| 484 |
* @return string[] |
| 485 |
*/ |
| 486 |
private function page_level_only(array $types): array { |
| 487 |
return array_values(array_intersect($types, self::PAGE_LEVEL_TYPES)); |
| 488 |
} |
| 489 |
|
| 490 |
/** |
| 491 |
* The URL to scan. |
| 492 |
* |
| 493 |
* The most recent published post, because a single post carries more |
| 494 |
* page-level entities than the front page on most sites, and falls back to |
| 495 |
* the home URL when there is no post to use. |
| 496 |
* |
| 497 |
* @return string |
| 498 |
*/ |
| 499 |
private function representative_url(): string { |
| 500 |
/** |
| 501 |
* Filters the URL the schema-conflict scan fetches. |
| 502 |
* |
| 503 |
* @since 2.9.0 |
| 504 |
* |
| 505 |
* @param string $url Representative front-end URL. |
| 506 |
*/ |
| 507 |
$filtered = apply_filters('thinkrank_schema_conflict_scan_url', ''); |
| 508 |
|
| 509 |
if (is_string($filtered) && $filtered !== '') { |
| 510 |
return $filtered; |
| 511 |
} |
| 512 |
|
| 513 |
$posts = get_posts([ |
| 514 |
'numberposts' => 1, |
| 515 |
'post_status' => 'publish', |
| 516 |
'post_type' => 'post', |
| 517 |
'has_password' => false, |
| 518 |
'suppress_filters' => false, |
| 519 |
'fields' => 'ids', |
| 520 |
]); |
| 521 |
|
| 522 |
if (!empty($posts)) { |
| 523 |
$permalink = get_permalink((int) $posts[0]); |
| 524 |
|
| 525 |
if (is_string($permalink) && $permalink !== '') { |
| 526 |
return $permalink; |
| 527 |
} |
| 528 |
} |
| 529 |
|
| 530 |
return home_url('/'); |
| 531 |
} |
| 532 |
|
| 533 |
/** |
| 534 |
* Fetch a front-end URL from this server. |
| 535 |
* |
| 536 |
* Anonymous (no cookies) so the scan sees what a search engine sees, and |
| 537 |
* `sslverify` off because this is a self-request — a local or self-signed |
| 538 |
* certificate must not read as a conflict-free page. Mirrors how WP Site |
| 539 |
* Health runs its own loopback probes, and how Instant Indexing checks its |
| 540 |
* key file. |
| 541 |
* |
| 542 |
* @param string $url URL to fetch. |
| 543 |
* @return string|\WP_Error Response body, or the failure. |
| 544 |
*/ |
| 545 |
private function fetch(string $url) { |
| 546 |
$response = wp_remote_get( |
| 547 |
$url, |
| 548 |
[ |
| 549 |
'timeout' => self::FETCH_TIMEOUT, |
| 550 |
'sslverify' => false, |
| 551 |
'redirection' => 3, |
| 552 |
'user-agent' => 'ThinkRank-SchemaConflictCheck/1.0', |
| 553 |
'headers' => ['Cache-Control' => 'no-cache'], |
| 554 |
] |
| 555 |
); |
| 556 |
|
| 557 |
if (is_wp_error($response)) { |
| 558 |
return $response; |
| 559 |
} |
| 560 |
|
| 561 |
$code = (int) wp_remote_retrieve_response_code($response); |
| 562 |
|
| 563 |
if ($code !== 200) { |
| 564 |
return new \WP_Error( |
| 565 |
'thinkrank_scan_http_error', |
| 566 |
sprintf( |
| 567 |
/* translators: %d: HTTP status code. */ |
| 568 |
__('The page returned HTTP %d, so it could not be checked.', 'thinkrank'), |
| 569 |
$code |
| 570 |
) |
| 571 |
); |
| 572 |
} |
| 573 |
|
| 574 |
$body = (string) wp_remote_retrieve_body($response); |
| 575 |
|
| 576 |
if ($body === '') { |
| 577 |
return new \WP_Error( |
| 578 |
'thinkrank_scan_empty_body', |
| 579 |
__('The page returned an empty response, so it could not be checked.', 'thinkrank') |
| 580 |
); |
| 581 |
} |
| 582 |
|
| 583 |
return $body; |
| 584 |
} |
| 585 |
} |
| 586 |
|
