xspeed / includes / class-module.php

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1	<?php
2	/**
3	* Module abstract base class.
4	*
5	* Every feature in xSpeed (Free or Pro) extends this class. The contract is
6	* documented in IMPLEMENTATION.md §1.1. A Module is a self-contained unit
7	* that declares its tier, settings schema, REST routes, UI panels, CLI
8	* commands, conflicts, and lifecycle hooks in one place — so moving a
9	* feature between Free and Pro is a `git mv` + flipping the TIER constant,
10	* with no call-site changes.
11	*
12	* Concrete modules MUST:
13	* - Set the SLUG class constant.
14	* - Set the TIER class constant (TIER_FREE or TIER_PRO).
15	* - Set the VERSION class constant.
16	*
17	* @package XSpeed
18	*/
19
20	namespace XSpeed;
21
22	defined( 'ABSPATH' ) \|\| exit;
23
24	abstract class Module {
25
26	public const TIER_FREE = 'free';
27	public const TIER_PRO = 'pro';
28
29	/**
30	* Concrete modules override these three constants.
31	*/
32	public const SLUG = '';
33	public const TIER = self::TIER_FREE;
34	public const VERSION = '1.0.0';
35
36	/**
37	* Other module slugs this module needs at boot. Resolved by
38	* Module_Registry via topological sort; missing deps fail loudly.
39	*
40	* @return string[]
41	*/
42	public function dependencies(): array {
43	return array();
44	}
45
46	/**
47	* Typed settings schema. See Settings_Manager::validate() for the
48	* supported `type` values (bool, int, string, enum, list, url). Each
49	* field declares `default` and optional `min` / `max` / `options` /
50	* `item_type`. Storage key is `xspeed_module_<slug>`.
51	*
52	* @return array<string,array>
53	*/
54	public function settings_schema(): array {
55	return array();
56	}
57
58	/**
59	* Settings this module keeps at their own defaults when xSpeed cannot own
60	* the page cache, even though they default to ON.
61	*
62	* Settings::conflict_safe_profile() switches off every bool so a
63	* site that already has a caching plugin gets an xSpeed that does nothing
64	* until asked. Two kinds of setting do not belong in that sweep: one where
65	* OFF is the wrong answer (a consent requirement), and one that cannot act
66	* at all while the feature above it is off, where writing false would
67	* suggest a decision nobody made.
68	*
69	* Naming a field here is a decision, not a default: the sweep covers every
70	* bool, so a field is only left alone because someone said so.
71	*
72	* @return string[] Field names from this module's settings_schema().
73	*/
74	public function conflict_safe_exempt(): array {
75	return array();
76	}
77
78	/**
79	* Option keys a module stores OUTSIDE its settings_schema that must
80	* survive a schema-driven save. Settings_Manager rebuilds the option
81	* from the schema on get()/update(), which would otherwise drop these.
82	* Example: the REST-cache module keeps its route `rules` array here so a
83	* plain enabled/ttl save doesn't wipe the rules table. (FBS-82408)
84	*
85	* @return string[]
86	*/
87	public function preserved_keys(): array {
88	return array();
89	}
90
91	/**
92	* Schema migrations keyed by target version. Each value is a callable
93	* that receives the stored options array and returns the migrated
94	* array. Migrations run in version order on first load after upgrade.
95	*
96	* @return array<string,callable>
97	*/
98	public function migrations(): array {
99	return array();
100	}
101
102	/**
103	* REST routes the module owns. Paths are prefixed with
104	* `/xspeed/v1/<slug>/` by Rest_Manager; declare without the prefix.
105	* `permission_callback` is wrapped automatically with a final cap
106	* check + tier gate, so modules don't need to repeat that boilerplate
107	* — but they MUST still declare a sensible callback.
108	*
109	* Default impl returns the standard GET + POST pair for modules that
110	* declare a settings_schema. Modules that need extra endpoints can
111	* extend the array. Modules with truly custom REST should override
112	* entirely and skip parent::rest_routes().
113	*
114	* Per SETTINGS.md §5.1 every module's settings live at:
115	* GET /xspeed/v1/<slug>/ → current settings
116	* POST /xspeed/v1/<slug>/ → partial patch, returns updated settings
117	*
118	* @return array[]
119	*/
120	public function rest_routes(): array {
121	if ( empty( $this->settings_schema() ) ) {
122	return array();
123	}
124	return array(
125	array(
126	'path' => '/',
127	'methods' => 'GET',
128	'callback' => array( $this, 'rest_get_settings' ),
129	),
130	array(
131	'path' => '/',
132	'methods' => 'POST',
133	'callback' => array( $this, 'rest_update_settings' ),
134	'feature' => static::SLUG,
135	),
136	);
137	}
138
139	/**
140	* Default GET handler — returns all settings (defaults + stored)
141	* coerced against the schema, with secret fields masked. Uses the public
142	* view (not get_settings()) so a credential never leaves in a REST payload;
143	* the engine reads real values through get_settings()/get_setting(). (#115)
144	* Modules can override but rarely need to.
145	*/
146	public function rest_get_settings( \WP_REST_Request $request ) {
147	return rest_ensure_response( Settings_Manager::get_public( static::SLUG ) );
148	}
149
150	/**
151	* Default POST handler — validates the JSON body against the
152	* schema, persists, returns the post-update settings. Unknown keys
153	* are stripped by Settings_Manager.
154	*/
155	public function rest_update_settings( \WP_REST_Request $request ) {
156	$params = $request->get_json_params();
157	if ( ! is_array( $params ) ) {
158	$params = $request->get_params();
159	}
160
161	// Say so, rather than returning 200 over a write that didn't happen.
162	// update_settings() enforces the gate on every surface; REST is the
163	// one with an error channel, so it reports the reason. (#143)
164	if ( $this->is_license_locked() ) {
165	return new \WP_Error(
166	'xspeed_license_required',
167	sprintf(
168	/* translators: %s: module slug. */
169	__( '"%s" is a Pro module and this site has no valid license, so its settings cannot be changed.', 'xspeed' ),
170	static::SLUG
171	),
172	array( 'status' => 403 )
173	);
174	}
175
176	return rest_ensure_response( $this->update_settings( $params ) );
177	}
178
179	/**
180	* Is this a Pro module whose settings are locked for want of a licence?
181	*
182	* Shared by the REST handler and the write guard so the two can never
183	* disagree about what is locked.
184	*/
185	final public function is_license_locked(): bool {
186	// The licence module itself must stay writable — otherwise an expired
187	// licence locks the user out of the very screen where a new key is
188	// entered.
189	if ( self::TIER_PRO !== $this->tier() \|\| 'license' === static::SLUG ) {
190	return false;
191	}
192
193	/**
194	* Filter: xspeed_pro_licensed
195	*
196	* Answered by xspeed-pro — the same filter it already answers when
197	* decorating module descriptors with the `locked` flag, so the write
198	* gate and the UI lock can't disagree.
199	*
200	* Defaults to true so a Free-only install (where nothing hooks this)
201	* is never gated by a question no one is present to answer.
202	*
203	* @param bool $licensed Whether Pro is licensed right now.
204	*/
205	return ! (bool) apply_filters( 'xspeed_pro_licensed', true );
206	}
207
208	/**
209	* UI panel declarations consumed by the React dashboard via the
210	* bootstrap payload. Each entry: [
211	* 'section' => 'cache' \| 'performance' \| 'images' \| ...,
212	* 'position' => int,
213	* 'component' => 'HealthCard' \| 'TogglesList' \| 'StatGrid' \| 'Custom',
214	* 'props' => array,
215	* ]
216	*
217	* @return array[]
218	*/
219	public function ui_panels(): array {
220	return array();
221	}
222
223	/**
224	* Sidebar / dashboard metadata. The React app uses these to render the
225	* module's nav entry. Override per module to set a friendly label and
226	* a lucide-react icon name (must be in the renderer's icon whitelist —
227	* see src/components/IconResolver.tsx).
228	*
229	* @return array{label:string,icon:string,description?:string,hidden?:bool}
230	*/
231	public function ui_metadata(): array {
232	return array(
233	'label' => ucfirst( str_replace( '_', ' ', static::SLUG ) ),
234	'icon' => 'Square',
235	);
236	}
237
238	/**
239	* Dynamic in-panel notices (callouts) rendered above the schema form.
240	* Computed fresh on every dashboard load. Examples: nginx GZIP
241	* snippet when the server can't be auto-configured, "drop-in
242	* missing" warning when cache_enabled but no advanced-cache.php.
243	*
244	* Each entry: [
245	* 'tone' => 'info' \| 'warn' \| 'danger' \| 'success',
246	* 'title' => 'Short heading.',
247	* 'body' => 'One- or two-sentence explanation.',
248	* 'snippet' => 'Optional verbatim code snippet rendered in a
249	* <pre> with a Copy button.',
250	* ]
251	*
252	* @return array[]
253	*/
254	public function ui_notices(): array {
255	return array();
256	}
257
258	/**
259	* Is this module actually doing something right now?
260	*
261	* "On" is not one shape across the plugin. Most modules carry an
262	* `enabled` setting, but page caching lives in the GLOBAL option
263	* (`xspeed_options.cache_enabled`), Minify and Lazy are on when any of
264	* their individual flags is set, and MCP is on when it is connected.
265	* The sidebar's "N on" badge counted only the literal `enabled` key, so
266	* it under-reported: on a site with page caching, minification, lazy
267	* loading and MCP all running it read "Cache 2 / Optimization 1" and
268	* left the plugin's headline feature out of its own count. (#363)
269	*
270	* The default below keeps the historic behaviour for the modules that
271	* genuinely do store `enabled`. A module whose "on" means something
272	* else overrides this and answers for itself, which is what stops the
273	* count drifting again the next time a module changes shape.
274	*
275	* Three-state on purpose:
276	* true — on and doing work
277	* false — off
278	* null — no meaningful on/off (a status panel like Health). Callers
279	* must exclude these rather than counting them as off.
280	*/
281	public function is_active(): ?bool {
282	$settings = $this->get_settings();
283	return array_key_exists( 'enabled', $settings )
284	? (bool) $settings['enabled']
285	: null;
286	}
287
288	/**
289	* "On if any of my boolean flags is on" — the shape used by modules
290	* that have no master switch, only a set of independent toggles
291	* (Minify, Lazy, Bloat, Gzip).
292	*
293	* Derived from the module's OWN schema rather than a hardcoded key
294	* list, so adding a flag to a module cannot silently fall out of its
295	* active state the way a literal list would. Only `bool` fields count:
296	* an int like `eager_first_n` or a list like `excluded_images` is
297	* configuration for a feature, not evidence the feature is on.
298	*
299	* Returns null when the module declares no boolean flags at all, so a
300	* caller can exclude it rather than record a misleading false.
301	*/
302	final protected function any_bool_flag_on(): ?bool {
303	$schema = $this->settings_schema();
304	$settings = $this->get_settings();
305
306	$found = false;
307	foreach ( $schema as $key => $spec ) {
308	if ( 'bool' !== ( $spec['type'] ?? '' ) ) {
309	continue;
310	}
311	$found = true;
312	if ( ! empty( $settings[ $key ] ) ) {
313	return true;
314	}
315	}
316
317	return $found ? false : null;
318	}
319
320	/**
321	* Why is this module reported on or off? One short sentence for the (i)
322	* beside the status pill.
323	*
324	* "On" is not one shape (see is_active()), so without this the pill is a
325	* bare assertion the user cannot check. It is most opaque exactly where
326	* the rule is least obvious: Media Optimization reads "On" while its two
327	* most prominent switches, Lazy-load Images and Iframes, are both off --
328	* because three other flags are on. The reason names them.
329	*
330	* Computed server-side alongside is_active() so the explanation cannot
331	* drift from the verdict it explains. Returning null means "no reason to
332	* add" and the (i) is not rendered.
333	*/
334	public function active_reason(): ?string {
335	// A module with its own `enabled` switch needs no explaining: the
336	// pill and the switch say the same thing, and an (i) that only
337	// restates the pill is noise on every one of those pages. Silence
338	// here is what keeps the (i) meaningful where it does appear.
339	if ( array_key_exists( 'enabled', $this->get_settings() ) ) {
340	return null;
341	}
342
343	return $this->bool_flag_reason();
344	}
345
346	/**
347	* The reason text for a module whose "on" is "any of my flags is on".
348	*
349	* Names the specific settings that are on, using their schema labels, so
350	* the user can go and look at them rather than take the pill on trust.
351	* Shared by every flag-based module for one consistent sentence.
352	*/
353	final protected function bool_flag_reason(): ?string {
354	$schema = $this->settings_schema();
355	$settings = $this->get_settings();
356
357	$on = array();
358	foreach ( $schema as $key => $spec ) {
359	if ( 'bool' !== ( $spec['type'] ?? '' ) ) {
360	continue;
361	}
362	if ( ! empty( $settings[ $key ] ) ) {
363	$on[] = $spec['label'] ?? $key;
364	}
365	}
366
367	// No boolean flags at all means the module has no on/off to explain
368	// (a status panel like Health). Mirrors any_bool_flag_on() returning
369	// null: no verdict, so no reason.
370	if ( null === $this->any_bool_flag_on() ) {
371	return null;
372	}
373
374	if ( empty( $on ) ) {
375	return __( 'This module has no single on/off switch. It counts as on when any of its settings is on, and none currently is.', 'xspeed' );
376	}
377
378	return sprintf(
379	/* translators: %s: comma-separated list of setting labels that are switched on. */
380	__( 'This module has no single on/off switch. It counts as on because these settings are on: %s.', 'xspeed' ),
381	implode( ', ', $on )
382	);
383	}
384
385	/**
386	* WP-CLI command definitions. Each entry: [
387	* 'name' => 'xspeed cache purge',
388	* 'callback' => callable,
389	* 'synopsis' => array, // wp-cli synopsis spec
390	* ]
391	*
392	* @return array[]
393	*/
394	public function cli_commands(): array {
395	return array();
396	}
397
398	/**
399	* Nginx directives this module contributes to the unified server-block
400	* snippet rendered by Cache::full_nginx_server_block(). Returning a
401	* non-null string opts the module into the consolidated "paste this
402	* once into your nginx vhost" UX on the Cache panel.
403	*
404	* The returned string should be the bare directives only — no `server
405	* { }` wrapper, no comment header (the aggregator adds one). Empty
406	* string and null are both treated as "no contribution this render".
407	*
408	* Return null (default) when the module is disabled, its current
409	* settings make the directives a no-op, or the module doesn't have
410	* nginx-side directives at all.
411	*/
412	public function nginx_directives(): ?string {
413	return null;
414	}
415
416	/**
417	* Conflict declarations for this module — which other plugins clash
418	* with which sub-feature. Each entry: [
419	* 'plugin' => 'wp-rocket/wp-rocket.php',
420	* 'feature' => 'page_cache',
421	* 'strategy' => 'refuse' \| 'warn' \| 'allow',
422	* 'reason' => 'human-readable why',
423	* ]
424	*
425	* @return array[]
426	*/
427	public function conflicts(): array {
428	return array();
429	}
430
431	/**
432	* Register WP hooks. Called by Module_Registry::boot_all() after
433	* dependencies are resolved. Modules should NOT register hooks in
434	* their constructors — only in boot() — so the registry can control
435	* load order.
436	*/
437	public function boot(): void {}
438
439	/**
440	* One-time setup at plugin activation. Idempotent. Examples: create
441	* a custom table, write a silence guard, register a cron schedule.
442	*/
443	public function activate(): void {}
444
445	/**
446	* Tear down at plugin deactivation. Reversible counterpart to
447	* activate(). MUST leave the site in a clean state — no orphaned
448	* cron jobs, no leftover drop-ins.
449	*/
450	public function deactivate(): void {}
451
452	/**
453	* Convenience accessors. Modules read/write their own settings
454	* through these so the storage detail (one option per module under
455	* `xspeed_module_<slug>`) stays encapsulated.
456	*/
457	final public function get_setting( string $key, $default = null ) {
458	$opts = Settings_Manager::get( static::SLUG );
459	return array_key_exists( $key, $opts ) ? $opts[ $key ] : $default;
460	}
461
462	final public function get_settings(): array {
463	return Settings_Manager::get( static::SLUG );
464	}
465
466	final public function update_settings( array $input ): array {
467	$refusal = $this->license_write_refusal( $input );
468	if ( null !== $refusal ) {
469	return $refusal;
470	}
471	return Settings_Manager::update( static::SLUG, $input );
472	}
473
474	/**
475	* Enforce the Pro licence gate on writes, or null to allow the write.
476	*
477	* The dashboard renders a Pro module as `locked` without a valid licence
478	* and refuses to toggle it, but that flag is applied by the
479	* `xspeed_module_descriptor` filter — a decoration on the payload the UI
480	* reads. It never reached the write path, so `POST /xspeed/v1/<module>`
481	* with `{"enabled": true}` returned 200 and persisted, and CLI/MCP hit the
482	* same unguarded callbacks.
483	*
484	* That mattered because module availability is decided by
485	* `Tier_Registry::is_available()`, which asks only whether the Pro plugin
486	* is LOADED — never whether it is licensed. So a Pro module boots and runs
487	* its hooks regardless, and a persisted `enabled: true` genuinely turns the
488	* feature on. This was not cosmetic. (#143)
489	*
490	* Free never references Pro: it asks through `xspeed_pro_licensed`, the
491	* same filter Pro already answers for the descriptor. With no Pro plugin
492	* present nothing hooks it, the default `true` stands, and Free modules
493	* are unaffected either way.
494	*
495	* Reads stay open — the dashboard must still be able to GET settings to
496	* render the locked state at all.
497	*
498	* @param array $input Proposed setting values.
499	* @return array\|null Current public settings when refused, else null.
500	*/
501	private function license_write_refusal( array $input ): ?array {
502	if ( ! $this->is_license_locked() ) {
503	return null;
504	}
505
506	Activity_Log::record(
507	'license_write_refused',
508	sprintf(
509	/* translators: %s: module slug. */
510	__( 'Refused a settings write to the Pro module "%s" — no valid license.', 'xspeed' ),
511	static::SLUG
512	),
513	Activity_Log::WARN
514	);
515
516	// Return the unchanged public settings rather than throwing: callers
517	// expect the module's settings back, and the dashboard already renders
518	// this module as locked. REST surfaces the refusal explicitly in
519	// rest_update_settings(), which has a WP_Error channel.
520	return Settings_Manager::get_public( static::SLUG );
521	}
522
523	final public function slug(): string {
524	return static::SLUG;
525	}
526
527	final public function tier(): string {
528	return static::TIER;
529	}
530
531	final public function version(): string {
532	return static::VERSION;
533	}
534	}
535