sharing-image / classes / class-premium.php

class-premium.php in Sharing Image 3.0, at classes/class-premium.php

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1	<?php
2	/**
3	* Handle premium tab on settings page and provide static methods.
4	*
5	* @package sharing-image
6	* @author Anton Lukin
7	*/
8
9	namespace Sharing_Image;
10
11	if ( ! defined( 'ABSPATH' ) ) {
12	die;
13	}
14
15	/**
16	* Premium class.
17	*
18	* @class Premium
19	*/
20	class Premium {
21	/**
22	* Sharing Image license options name.
23	*
24	* @var string
25	*/
26	const OPTION_LICENSE = 'sharing_image_license';
27
28	/**
29	* Remote licenses API url.
30	*
31	* @var string
32	*/
33	const REMOTE_LICENSES = 'https://wpset.org/sharing-image/verify/';
34
35	/**
36	* Premium verification event name.
37	*
38	* @var string
39	*/
40	const EVENT_PREMIUM = 'sharing_image_event_premium';
41
42	/**
43	* Init class actions and filters.
44	*/
45	public static function init() {
46	add_action( 'admin_init', array( __CLASS__, 'handle_requests' ) );
47	add_action( self::EVENT_PREMIUM, array( __CLASS__, 'launch_verification_event' ), 10, 1 );
48	add_action( 'load-settings_page_' . Settings::SETTINGS_SLUG, array( __CLASS__, 'check_verification_event' ) );
49	}
50
51	/**
52	* Handle premium requests from admin-side.
53	*/
54	public static function handle_requests() {
55	add_action( 'wp_ajax_sharing_image_verify_premium', array( __CLASS__, 'verify_premium_key' ) );
56	add_action( 'wp_ajax_sharing_image_revoke_premium', array( __CLASS__, 'revoke_premium_access' ) );
57	}
58
59	/**
60	* Verify Premium key from AJAX request.
61	*/
62	public static function verify_premium_key() {
63	$check = check_ajax_referer( Settings::SETTINGS_NONCE, 'sharing_image_nonce', false );
64
65	if ( false === $check ) {
66	wp_send_json_error( __( 'Invalid security token. Please reload the page and try again.', 'sharing-image' ), 403 );
67	}
68
69	if ( empty( $_POST['sharing_image_key'] ) ) {
70	wp_send_json_error( __( 'Premium key is undefined.', 'sharing-image' ), 400 );
71	}
72
73	$key = sanitize_text_field( wp_unslash( $_POST['sharing_image_key'] ) );
74
75	$args = array(
76	'body' => array(
77	'key' => $key,
78	'domain' => wp_parse_url( site_url(), PHP_URL_HOST ),
79	),
80	);
81
82	$response = wp_remote_post( self::REMOTE_LICENSES, $args );
83
84	if ( is_wp_error( $response ) ) {
85	wp_send_json_error( __( 'Remote request error: ', 'sharing-image' ) . $response->get_error_message(), 400 );
86	}
87
88	$answer = json_decode( $response['body'], true );
89
90	if ( ! isset( $answer['success'] ) ) {
91	wp_send_json_error( __( 'Invalid response received from the verification server.', 'sharing-image' ), 400 );
92	}
93
94	wp_unschedule_hook( self::EVENT_PREMIUM );
95
96	if ( true === $answer['success'] ) {
97	$license = self::update_license( true, $key );
98
99	self::schedule_verification();
100
101	wp_send_json_success( $license );
102	}
103
104	$error = array(
105	'success' => false,
106	'data' => __( 'Verification unsuccessful.', 'sharing-image' ),
107	);
108
109	if ( isset( $answer['result'] ) ) {
110	$error['code'] = $answer['result'];
111	}
112
113	self::update_license( false, $key );
114
115	wp_send_json( $error, 403 );
116	}
117
118	/**
119	* Revoke Premium access from AJAX request.
120	*/
121	public static function revoke_premium_access() {
122	$check = check_ajax_referer( Settings::SETTINGS_NONCE, 'sharing_image_nonce', false );
123
124	if ( false === $check ) {
125	wp_send_json_error( __( 'Invalid security token. Please reload the page and try again.', 'sharing-image' ), 403 );
126	}
127
128	// Remove license verification event.
129	wp_unschedule_hook( self::EVENT_PREMIUM );
130
131	// Disable Premium license.
132	$license = self::update_license( false );
133
134	wp_send_json_success( $license );
135	}
136
137
138	/**
139	* Get plugin license settings.
140	*
141	* @return array List of plugin license settings.
142	*/
143	public static function get_license() {
144	$license = get_option( self::OPTION_LICENSE, array() );
145
146	/**
147	* Check if the plugin in development mode.
148	*
149	* @param bool Current development state. Disabled by default.
150	*/
151	$develop = apply_filters( 'sharing_image_develop', false );
152
153	if ( $develop ) {
154	$license['develop'] = true;
155	}
156
157	/**
158	* Filters license settings.
159	*
160	* @param array List of plugin license settings.
161	*/
162	return apply_filters( 'sharing_image_get_license', $license );
163	}
164
165	/**
166	* Set license options.
167	*
168	* @param bool $premium Premium status.
169	* @param string $key License key.
170	* @param string $error Verification error code.
171
172	* @return array License options.
173	*/
174	public static function update_license( $premium, $key = '', $error = '' ) {
175	$license = get_option( self::OPTION_LICENSE, array() );
176
177	if ( ! empty( $key ) ) {
178	$license['key'] = $key;
179	}
180
181	unset( $license['error'] );
182
183	if ( ! empty( $error ) ) {
184	$license['error'] = $error;
185	}
186
187	$license['premium'] = $premium;
188
189	// Save updated license settings in database.
190	update_option( self::OPTION_LICENSE, $license );
191
192	return $license;
193	}
194
195	/**
196	* Launch scheduled license verification event.
197	* Do not disable Premium if the verification server does not respond.
198	*
199	* @param string\|null $key Optional. Legacy license key.
200	*/
201	public static function launch_verification_event( $key = null ) {
202	if ( ! is_null( $key ) ) {
203	self::reschedule_verification();
204	}
205
206	$license = get_option( self::OPTION_LICENSE, array() );
207
208	if ( empty( $license['key'] ) ) {
209	return self::update_license( false, '' );
210	}
211
212	$args = array(
213	'body' => array(
214	'key' => $license['key'],
215	'domain' => wp_parse_url( site_url(), PHP_URL_HOST ),
216	),
217	);
218
219	$response = wp_remote_post( self::REMOTE_LICENSES, $args );
220
221	if ( is_wp_error( $response ) ) {
222	return;
223	}
224
225	$answer = json_decode( $response['body'], true );
226
227	if ( ! isset( $answer['success'] ) ) {
228	return;
229	}
230
231	if ( true === $answer['success'] ) {
232	return self::update_license( true, $license['key'] );
233	}
234
235	if ( ! isset( $answer['result'] ) ) {
236	return self::update_license( false, $license['key'] );
237	}
238
239	self::update_license( false, $license['key'], $answer['result'] );
240	}
241
242	/**
243	* Check if Premium features availible.
244	*
245	* @return bool Whether premium features are enabled.
246	*/
247	public static function is_premium_features() {
248	$license = self::get_license();
249
250	if ( ! empty( $license['premium'] ) \|\| ! empty( $license['develop'] ) ) {
251	return true;
252	}
253
254	return false;
255	}
256
257	/**
258	* Reschedule license verification with current Premium key.
259	*/
260	public static function check_verification_event() {
261	$license = self::get_license();
262
263	if ( empty( $license['premium'] ) ) {
264	return;
265	}
266
267	self::schedule_verification();
268	}
269
270	/**
271	* Schedule license verification.
272	*/
273	public static function schedule_verification() {
274	if ( wp_next_scheduled( self::EVENT_PREMIUM ) ) {
275	return;
276	}
277
278	wp_schedule_event( time() + DAY_IN_SECONDS / 2, 'twicedaily', self::EVENT_PREMIUM );
279	}
280
281	/**
282	* Delete all events with the same name and schedule again.
283	*/
284	public static function reschedule_verification() {
285	wp_unschedule_hook( self::EVENT_PREMIUM );
286
287	self::schedule_verification();
288	}
289	}
290