thinkrank / includes / core / class-settings.php

class-settings.php in ThinkRank AI SEO – AI SEO Plugin for WordPress: Schema, XML Sitemaps, Meta Tags, Search Console & Local SEO 2.1.1, at includes/core/class-settings.php

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1	<?php
2
3	/**
4	* Settings Class
5	*
6	* Handles plugin settings and configuration using WordPress options
7	*
8	* @package ThinkRank\Core
9	* @since 1.0.0
10	*/
11
12	declare(strict_types=1);
13
14	namespace ThinkRank\Core;
15
16	// Prevent direct access
17	if (!defined('ABSPATH')) {
18	exit;
19	}
20
21	/**
22	* Settings Class
23	*
24	* Single Responsibility: Manage plugin settings and configuration
25	* Uses WordPress options for storage.
26	*
27	* Use Settings::instance() to get the shared instance rather than
28	* creating new instances — this ensures the internal cache is shared
29	* across all consumers and avoids redundant get_option() calls.
30	*
31	* @since 1.0.0
32	*/
33	class Settings {
34
35	/**
36	* Canonical default AI model per provider.
37	*
38	* Single source of truth. Every call site that needs a provider's default
39	* model — the $defaults array below, the AI client constructors, the manager
40	* fallbacks, the content-brief generator and the usage-analytics endpoint —
41	* MUST reference these constants instead of repeating the literal, so the
42	* defaults can never silently drift out of sync (see issue #273).
43	*
44	* @since 1.28.0
45	*/
46	const DEFAULT_OPENAI_MODEL = 'gpt-5-nano';
47	const DEFAULT_CLAUDE_MODEL = 'claude-sonnet-5';
48	const DEFAULT_GEMINI_MODEL = 'gemini-3.5-flash';
49	const DEFAULT_OPENROUTER_MODEL = 'openai/gpt-4o-mini';
50
51	/**
52	* Canonical default author-archive templates.
53	*
54	* Same single-source-of-truth rule as the model constants above: the
55	* defaults array, the REST endpoint, the get-settings ability and
56	* Author_Archives_Manager all read these instead of repeating the literal,
57	* which had already drifted — the title default hardcoded an en dash while
58	* the feature resolves %separator% from Site Identity (#318).
59	*
60	* @since 1.29.1
61	*/
62	const DEFAULT_AUTHOR_ARCHIVES_TITLE = '%author_name% %separator% %site_title% %page%';
63	const DEFAULT_AUTHOR_ARCHIVES_META_DESC = 'Articles written by %author_name% on %site_title%';
64
65	/**
66	* String settings where a stored empty string is a real value, not "unset".
67	*
68	* get() normally treats '' the same as a missing option and returns the
69	* default, which is right for most keys — a blank API key or model name is
70	* never what the user meant. For these template fields it is the opposite:
71	* clearing the box means "render no template", and the consumers already
72	* branch on an empty value. Without the opt-out the save appeared to
73	* succeed and the default reappeared on the next request (#316).
74	*
75	* @since 1.29.1
76	* @var string[]
77	*/
78	private const EMPTY_IS_A_VALUE = [
79	'author_archives_title',
80	'author_archives_meta_desc',
81	];
82
83	/**
84	* Shared singleton instance
85	*
86	* @var Settings\|null
87	*/
88	private static ?Settings $instance = null;
89
90	/**
91	* Get the shared Settings instance
92	*
93	* Returns the instance registered in the main plugin's component
94	* container, or creates a standalone instance if the plugin hasn't
95	* loaded yet (e.g., during activation).
96	*
97	* @since 1.10.0
98	* @return Settings
99	*/
100	public static function instance(): Settings {
101	if (self::$instance !== null) {
102	return self::$instance;
103	}
104
105	// Try to get from the main plugin container
106	if (function_exists('thinkrank')) {
107	$plugin = thinkrank();
108	$component = $plugin->get_component('settings');
109	if ($component instanceof self) {
110	self::$instance = $component;
111	return self::$instance;
112	}
113	}
114
115	// Fallback: create standalone instance (during activation, etc.)
116	self::$instance = new self();
117	return self::$instance;
118	}
119
120	/**
121	* Settings cache
122	*
123	* @var array
124	*/
125	private array $cache = [];
126
127	/**
128	* Default settings
129	*
130	* @var array
131	*/
132	private array $defaults = [
133	// AI Settings
134	'ai_provider' => 'openai',
135	'openai_api_key' => '',
136	'openai_model' => self::DEFAULT_OPENAI_MODEL,
137	'claude_api_key' => '',
138	'claude_model' => self::DEFAULT_CLAUDE_MODEL, // Recommended default (best speed/quality balance)
139	'gemini_api_key' => '',
140	'gemini_model' => self::DEFAULT_GEMINI_MODEL,
141	'openrouter_api_key' => '',
142	'openrouter_model' => self::DEFAULT_OPENROUTER_MODEL,
143	'max_tokens' => 1000,
144	'temperature' => 0.7,
145
146	// Google API Keys (encrypted)
147	'google_analytics_api_key' => '',
148	'google_search_console_api_key' => '',
149	'google_pagespeed_api_key' => '',
150
151	// Google OAuth Tokens (encrypted)
152	'google_access_token' => '',
153	'google_refresh_token' => '',
154	'google_token_expires_in' => 0,
155	'google_token_created' => 0,
156	'google_account_connected' => false,
157
158	// Google Analytics Pro Settings. Read/written by thinkrank-pro's
159	// GoogleAnalyticsSettings.js through the settings-management endpoint —
160	// no consumer exists in THIS repo, so don't dead-key these.
161	'ga_analytics_account_id' => '',
162	'ga_analytics_data_stream_id' => '',
163
164	// Performance Settings
165	'cache_duration' => 3600,
166	'max_requests_per_minute' => 10,
167	'enable_logging' => true,
168
169	// Integration Settings
170	'api_timeout' => 30,
171	'enable_rate_limiting' => true,
172	'auto_test_connections' => true,
173	'retry_failed_requests' => true,
174
175	// Social Platform Settings
176	// Public IDs (not encrypted)
177	'facebook_app_id' => '',
178	'facebook_admins' => '',
179	'youtube_channel_id' => '',
180	'whatsapp_business_id' => '',
181	// Verification codes (encrypted)
182	'pinterest_site_verification' => '',
183	'instagram_verification' => '',
184	'tiktok_verification' => '',
185
186	// SEO Settings
187	'auto_optimize' => false,
188	'seo_score_threshold' => 70,
189	'enable_meta_generation' => true,
190	'enable_schema_markup' => true,
191
192	// Auto AI Optimization (on-publish metadata fill; #248 P1)
193	'auto_ai_meta_enabled' => false,
194	'auto_ai_meta_post_types' => ['post'],
195
196	// Brand Visibility v2. The brand profile drives question generation
197	// and mention detection; per-platform keys let this feature query
198	// several assistants without changing the site-wide AI provider.
199	'bv_brand_name' => '',
200	'bv_variants' => [],
201	'bv_location' => '',
202	'bv_category' => '',
203	'bv_description' => '',
204	'bv_competitors' => [],
205	'bv_queries' => [],
206	'bv_platforms' => ['chatgpt'],
207	'bv_samples' => 1,
208	'bv_key_chatgpt' => '',
209	'bv_key_gemini' => '',
210	'bv_key_claude' => '',
211	'bv_key_perplexity' => '',
212	// Empty = use the platform's default model (see Brand_Visibility_Providers).
213	'bv_model_chatgpt' => '',
214	'bv_model_gemini' => '',
215	'bv_model_claude' => '',
216	'bv_model_perplexity' => '',
217
218	// AI Brand Visibility (BYO-key checks; #248 P1)
219	'brand_visibility_queries' => [],
220
221	// Author Archives Settings
222	'author_archives_enabled' => true,
223	'author_archives_index' => true,
224	'author_archives_show_empty' => false,
225	'author_archives_title' => self::DEFAULT_AUTHOR_ARCHIVES_TITLE,
226	'author_archives_meta_desc' => self::DEFAULT_AUTHOR_ARCHIVES_META_DESC,
227
228	// UI Settings
229	'show_welcome_message' => true,
230	'dashboard_widgets' => ['seo_score', 'ai_usage', 'recent_briefs'],
231	'editor_panel_position' => 'side',
232
233	// Advanced Settings
234	'debug_mode' => false,
235	'retry_attempts' => 3,
236	// Exposes the standalone Migration admin page for re-running SEO data
237	// imports after setup. Hidden by default; opt-in for advanced/support use.
238	'enable_migration_tools' => false,
239
240	// Privacy Settings
241	'data_retention_days' => 90,
242	'anonymize_logs' => true,
243	'share_usage_data' => false,
244
245	// Integration Settings
246	'google_analytics_id' => '',
247	'search_console_property' => '',
248
249	// GA4 Tracking Settings
250	'ga4_measurement_id' => '',
251	'ga4_auto_inject' => false,
252	'ga4_anonymize_ip' => false,
253	'ga4_exclude_admin' => false,
254	'ga4_tracking_verified' => false,
255	'ga4_last_verification' => '',
256
257	// SEO Analytics Settings
258	'seo_analytics_enabled' => false,
259	'seo_analytics_setup_completed' => false,
260	'seo_analytics_google_analytics_property_id' => '',
261	'seo_analytics_enable_ai_insights' => true,
262	'seo_analytics_enable_automated_alerts' => false,
263	'seo_analytics_enable_predictive_analysis' => false,
264	'seo_analytics_monitoring_frequency' => 3600,
265	'seo_analytics_alert_thresholds' => [],
266	'seo_analytics_report_schedule' => 'weekly',
267	'seo_analytics_data_retention_days' => 90,
268	'seo_analytics_cache_analytics_data' => true,
269
270	// Uninstall Settings
271	'keep_data_on_uninstall' => true,
272
273	// MCP (Model Context Protocol) Settings
274	'enable_mcp' => false,
275	];
276
277	/**
278	* Encrypted settings keys
279	*
280	* @var array
281	*/
282	private array $encrypted_keys = [
283	// AI API Keys
284	'openai_api_key',
285	'claude_api_key',
286	'gemini_api_key',
287	'openrouter_api_key',
288	// Google API Keys
289	'google_analytics_api_key',
290	'google_search_console_api_key',
291	'google_pagespeed_api_key',
292	'google_access_token',
293	'google_refresh_token',
294	// Social Platform Verification Codes (sensitive)
295	'pinterest_site_verification',
296	'instagram_verification',
297	'tiktok_verification',
298	];
299
300	/**
301	* Initialize settings
302	*
303	* @return void
304	*/
305	public function init(): void {
306	add_action('admin_init', [$this, 'register_settings']);
307	}
308
309	/**
310	* Register WordPress settings
311	*
312	* @return void
313	*/
314	public function register_settings(): void {
315	register_setting('thinkrank_settings', 'thinkrank_settings', [
316	'sanitize_callback' => [$this, 'sanitize_settings'],
317	'default' => $this->defaults,
318	]);
319	}
320
321	/**
322	* Warm the option cache for a batch of setting keys in one query.
323	*
324	* Every `thinkrank_*` option is autoload=off, so WordPress cannot serve
325	* them from `alloptions` and each get() below is its own round-trip. A
326	* caller that reads a known list of keys should prime it first: on a
327	* ~1ms managed-hosting round-trip, sixteen of those on an anonymous
328	* pageview is ~16ms spent on values the page may not use (#393).
329	*
330	* get() memoizes within the request, so only the first read of each key
331	* ever reaches the database — this is what collapses those first reads.
332	* Keys already memoized are left out of the batch.
333	*
334	* wp_prime_option_caches() is WP 6.4+; the plugin supports 6.0, so an
335	* older site simply keeps the previous behaviour.
336	*
337	* @since 2.1.0
338	*
339	* @param string[] $keys Setting keys, without the `thinkrank_` prefix.
340	* @return void
341	*/
342	public function prime(array $keys): void {
343	if (!function_exists('wp_prime_option_caches')) {
344	return;
345	}
346
347	$unread = [];
348
349	foreach ($keys as $key) {
350	if (!isset($this->cache[$key])) {
351	$unread[] = 'thinkrank_' . $key;
352	}
353	}
354
355	if (!empty($unread)) {
356	wp_prime_option_caches($unread);
357	}
358	}
359
360	/**
361	* Get setting value
362	*
363	* @param string $key Setting key
364	* @param mixed $fallback Default value
365	* @param int $user_id User ID (0 for global, >0 for user-specific)
366	* @return mixed Setting value
367	*/
368	public function get(string $key, $fallback = null, int $user_id = 0) {
369	// Check cache first
370	$cache_key = $user_id > 0 ? "user_{$user_id}_{$key}" : $key;
371
372	if (isset($this->cache[$cache_key])) {
373	return $this->maybe_decrypt($key, $this->cache[$cache_key]);
374	}
375
376	// Load from WordPress options or user meta
377	if ($user_id > 0) {
378	$value = get_user_meta($user_id, "thinkrank_{$key}", true);
379	} else {
380	$value = get_option("thinkrank_{$key}", null);
381	}
382
383
384
385	// Handle boolean settings with special logic for WordPress storage quirks
386	if (isset($this->defaults[$key]) && is_bool($this->defaults[$key])) {
387	// Convert string representations back to booleans
388	if ('1' === $value \|\| 1 === $value \|\| true === $value \|\| 'true' === $value) {
389	$value = true;
390	} elseif ('0' === $value \|\| 0 === $value \|\| false === $value \|\| 'false' === $value) {
391	$value = false;
392	} elseif (null === $value \|\| '' === $value) {
393	// For boolean settings, empty string could mean false was stored
394	// null means option doesn't exist, empty string means it was stored as empty
395	if (null !== $value && $value === '') {
396	// Empty string exists in DB, this likely means false was stored
397	$value = false;
398	} else {
399	// Option doesn't exist, use default
400	$value = $fallback ?? $this->defaults[$key];
401	}
402	}
403	} else {
404	// Non-boolean settings: use default if not found.
405	//
406	// get_option() above is called with a null default, so null means
407	// "no row" while '' means a value was deliberately stored. For most
408	// keys we collapse the two — an empty string is treated as unset so
409	// the documented default applies. Keys in EMPTY_IS_A_VALUE opt out:
410	// there, clearing the field is a real choice the consumer honours,
411	// and folding it back into the default made the save look like it
412	// silently failed (#316).
413	$empty_is_unset = !in_array($key, self::EMPTY_IS_A_VALUE, true);
414
415	if (null === $value \|\| ($empty_is_unset && '' === $value)) {
416	$value = $fallback ?? ($this->defaults[$key] ?? null);
417	}
418	}
419
420	// Cache the value
421	$this->cache[$cache_key] = $value;
422
423	return $this->maybe_decrypt($key, $value);
424	}
425
426	/**
427	* Set setting value
428	*
429	* @param string $key Setting key
430	* @param mixed $value Setting value
431	* @param int $user_id User ID (0 for global, >0 for user-specific)
432	* @return bool Success status
433	*/
434	public function set(string $key, $value, int $user_id = 0): bool {
435	// Check if key exists in defaults
436	if (!array_key_exists($key, $this->defaults)) {
437	return false;
438	}
439
440
441
442	// Encrypt if needed
443	$encrypted_value = $this->maybe_encrypt($key, $value);
444
445	// Save to WordPress options or user meta
446	if ($user_id > 0) {
447	$result = update_user_meta($user_id, "thinkrank_{$key}", $encrypted_value);
448	} else {
449	$option_name = "thinkrank_{$key}";
450	$is_sensitive = in_array($key, $this->encrypted_keys, true);
451
452	// Determine if option exists
453	$existing = get_option($option_name, '__tr_not_set__');
454	if ($existing === '__tr_not_set__') {
455	// First-time save: set autoload=no for sensitive options
456	$autoload = $is_sensitive ? 'no' : 'yes';
457	$result = add_option($option_name, $encrypted_value, '', $autoload);
458	} else {
459	// Update existing option; enforce autoload=no for sensitive options
460	if ($is_sensitive) {
461	$result = update_option($option_name, $encrypted_value, 'no');
462	} else {
463	$result = update_option($option_name, $encrypted_value);
464	}
465	}
466
467	// Verify value actually saved (update_option returns false when unchanged)
468	$saved_value = get_option($option_name, 'NOT_FOUND');
469	// The loose branch is load-bearing: get_option() returns the stored
470	// STRING ('1', '0', '30') while $encrypted_value may be the original
471	// bool/int. On an unchanged re-save update_option() returns false, so
472	// this comparison is the only thing that marks the save successful —
473	// strict-only here made every unchanged-boolean re-save report failure.
474	$values_match = ($saved_value === $encrypted_value) \|\|
475	($saved_value == $encrypted_value && $encrypted_value !== 'NOT_FOUND'); // phpcs:ignore Universal.Operators.StrictComparisons.LooseEqual -- intentional type-tolerant verify, see above.
476
477	// Consider it successful if the value was saved correctly
478	$result = $result \|\| $values_match;
479	}
480
481	// Update cache
482	if ($result) {
483	$cache_key = $user_id > 0 ? "user_{$user_id}_{$key}" : $key;
484	$this->cache[$cache_key] = $encrypted_value;
485
486	// Invalidate bulk cache when individual setting changes
487	$bulk_cache_key = $user_id > 0 ? "bulk_user_{$user_id}" : 'bulk_global';
488	wp_cache_delete($bulk_cache_key, 'thinkrank_settings');
489	}
490
491	return $result !== false;
492	}
493
494	/**
495	* Delete setting
496	*
497	* @param string $key Setting key
498	* @param int $user_id User ID (0 for global, >0 for user-specific)
499	* @return bool Success status
500	*/
501	public function delete(string $key, int $user_id = 0): bool {
502	// Remove from WordPress options or user meta
503	if ($user_id > 0) {
504	$result = delete_user_meta($user_id, "thinkrank_{$key}");
505	} else {
506	$result = delete_option("thinkrank_{$key}");
507	}
508
509	// Remove from cache
510	if ($result) {
511	$cache_key = $user_id > 0 ? "user_{$user_id}_{$key}" : $key;
512	unset($this->cache[$cache_key]);
513
514	// Also invalidate the bulk cache written by get_all(), or it serves
515	// stale values for up to 5 minutes after a delete.
516	$bulk_cache_key = $user_id > 0 ? "bulk_user_{$user_id}" : 'bulk_global';
517	wp_cache_delete($bulk_cache_key, 'thinkrank_settings');
518	}
519
520	return $result;
521	}
522
523	/**
524	* Get all settings (optimized with bulk caching)
525	*
526	* @param int $user_id User ID (0 for global)
527	* @return array All settings
528	*/
529	public function get_all(int $user_id = 0): array {
530	// Check bulk cache first
531	$bulk_cache_key = $user_id > 0 ? "bulk_user_{$user_id}" : 'bulk_global';
532
533	$cached_settings = wp_cache_get($bulk_cache_key, 'thinkrank_settings');
534	if ($cached_settings !== false) {
535	return $cached_settings;
536	}
537
538	$settings = [];
539
540	foreach (array_keys($this->defaults) as $key) {
541	$settings[$key] = $this->get($key, null, $user_id);
542	}
543
544	// Cache all settings for 5 minutes
545	wp_cache_set($bulk_cache_key, $settings, 'thinkrank_settings', 300);
546
547	return $settings;
548	}
549
550	/**
551	* Reset settings to defaults
552	*
553	* @param int $user_id User ID (0 for global)
554	* @return bool Success status
555	*/
556	public function reset(int $user_id = 0): bool {
557	$success = true;
558
559	foreach (array_keys($this->defaults) as $key) {
560	if (!$this->delete($key, $user_id)) {
561	$success = false;
562	}
563	}
564
565	// Clear cache — both the instance array and the bulk object cache
566	// written by get_all(), which would otherwise return stale pre-reset
567	// values for up to 5 minutes.
568	$this->cache = [];
569	$bulk_cache_key = $user_id > 0 ? "bulk_user_{$user_id}" : 'bulk_global';
570	wp_cache_delete($bulk_cache_key, 'thinkrank_settings');
571
572	return $success;
573	}
574
575	/**
576	* Sanitize settings
577	*
578	* @param array $settings Settings array
579	* @return array Sanitized settings
580	*/
581	public function sanitize_settings(array $settings): array {
582	$sanitized = [];
583
584	foreach ($settings as $key => $value) {
585	$sanitized[$key] = $this->sanitize_setting($key, $value);
586	}
587
588	return $sanitized;
589	}
590
591	/**
592	* Sanitize individual setting
593	*
594	* @param string $key Setting key
595	* @param mixed $value Setting value
596	* @return mixed Sanitized value
597	*/
598	private function sanitize_setting(string $key, $value) {
599	// Only keys that are declared array-typed may receive an array. For a
600	// scalar key an array/object value is malformed input, and the scalar
601	// sanitizers below would fatal on it, so fall back to the declared
602	// default instead of letting the bad value through.
603	if (is_array($value) \|\| is_object($value)) {
604	if (!is_array($this->defaults[$key] ?? null)) {
605	return $this->defaults[$key] ?? '';
606	}
607	$value = (array) $value;
608	}
609
610	switch ($key) {
611	case 'openai_api_key':
612	case 'claude_api_key':
613	case 'gemini_api_key':
614	case 'openrouter_api_key':
615	return sanitize_text_field($value);
616
617	case 'ai_provider':
618	return sanitize_key($value);
619
620	case 'openai_model':
621	case 'claude_model':
622	case 'gemini_model':
623	case 'openrouter_model':
624	// Model ids may contain dots and slashes (e.g. "gpt-4.1" or
625	// "openai/gpt-4o-mini") and users can enter custom models, so
626	// sanitize_key() would corrupt them — use text-field sanitizing.
627	return sanitize_text_field($value);
628
629	case 'max_tokens':
630	case 'cache_duration':
631	case 'max_requests_per_minute':
632	case 'seo_score_threshold':
633	case 'api_timeout':
634	case 'retry_attempts':
635	case 'data_retention_days':
636	case 'monitoring_frequency':
637	return absint($value);
638
639	case 'temperature':
640	return (float) $value;
641
642	case 'dashboard_widgets':
643	return is_array($value) ? array_map('sanitize_key', $value) : [];
644
645	case 'seo_analytics_alert_thresholds':
646	// A threshold_name => value map where the values are numbers
647	// (e.g. traffic_drop_percentage => 20) as well as strings, so
648	// sanitize each value by its own type rather than forcing every
649	// one through sanitize_key() — that turned ints into strings.
650	if (!is_array($value)) {
651	return [];
652	}
653	$thresholds = [];
654	foreach ($value as $threshold_key => $threshold_value) {
655	if (is_array($threshold_value)) {
656	continue;
657	}
658	$thresholds[sanitize_key($threshold_key)] = is_numeric($threshold_value)
659	? $threshold_value + 0
660	: sanitize_text_field((string) $threshold_value);
661	}
662	return $thresholds;
663
664	case 'google_analytics_property_id':
665	case 'seo_analytics_google_analytics_property_id':
666	case 'seo_analytics_report_schedule':
667	return sanitize_text_field($value);
668
669	case 'robots_txt_content':
670	// Multi-line content — sanitize_text_field() collapses newlines
671	// and would flatten the whole file onto a single line.
672	return sanitize_textarea_field($value);
673
674	default:
675	if (is_bool($value)) {
676	return (bool) $value;
677	} elseif (is_string($value)) {
678	return sanitize_text_field($value);
679	} elseif (is_array($value)) {
680	// Flat list/map of scalars; nested members are dropped rather
681	// than passed to a string sanitizer that would fatal on them.
682	$sanitized = [];
683	foreach ($value as $item_key => $item) {
684	if (is_array($item) \|\| is_object($item)) {
685	continue;
686	}
687	$sanitized[is_string($item_key) ? sanitize_key($item_key) : $item_key] =
688	sanitize_text_field((string) $item);
689	}
690	return $sanitized;
691	}
692	return $value;
693	}
694	}
695
696	/**
697	* Marker prefix for values encrypted with the libsodium scheme below.
698	*/
699	private const ENC_PREFIX = 'trenc:v1:';
700
701	/**
702	* Encrypt secret settings (API keys, OAuth tokens) at rest using libsodium
703	* authenticated encryption. Non-secret keys and environments without sodium
704	* fall back to plaintext so behaviour stays stable.
705	*
706	* @param string $key Setting key
707	* @param mixed $value Setting value
708	* @return mixed Encrypted payload (string) or original value
709	*/
710	private function maybe_encrypt(string $key, $value) {
711	if (!in_array($key, $this->encrypted_keys, true) \|\| !is_string($value) \|\| '' === $value) {
712	return $value;
713	}
714
715	// Same scheme, same key, same prefix — it just lives in Secret_At_Rest
716	// now so the MCP pairing token can use it too (#396).
717	return Secret_At_Rest::encrypt($value);
718	}
719
720	/**
721	* Decrypt a value previously encrypted by maybe_encrypt. Values without the
722	* marker prefix are legacy plaintext and returned untouched (backward compat).
723	*
724	* @param string $key Setting key
725	* @param mixed $value Setting value
726	* @return mixed Decrypted or original value
727	*/
728	private function maybe_decrypt(string $key, $value) {
729	if (!is_string($value) \|\| strncmp($value, self::ENC_PREFIX, strlen(self::ENC_PREFIX)) !== 0) {
730	return $value; // legacy plaintext or non-string
731	}
732
733	$plain = Secret_At_Rest::decrypt($value);
734
735	if ('' === $plain) {
736	// We reach here only when sodium is available and a key was
737	// derivable, so this is a genuine failure: the auth salt changed
738	// (config rotated, or the site was migrated without wp-config) or
739	// the row is corrupt. The value is unrecoverable either way.
740	//
741	// Returning the ciphertext would send it upstream as a bearer
742	// token or API key, producing an opaque 401 far from the cause.
743	// Return empty so callers see "no credential" and can prompt for
744	// a reconnect instead.
745	return '';
746	}
747
748	return $plain;
749	}
750	}
751