class-give-email-access.php — GiveWP – Donation Plugin and Fundraising Platform 3.19.4

give / includes / class-give-email-access.php

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class-give-email-access.php

415 lines

1	<?php
2	/**
3	* Email Access
4	*
5	* @package Give
6	* @subpackage Classes/Give_Email_Access
7	* @copyright Copyright (c) 2016, GiveWP
8	* @license https://opensource.org/licenses/gpl-license GNU Public License
9	* @since 1.4
10	*/
11
12	// Exit if accessed directly.
13	if ( ! defined( 'ABSPATH' ) ) {
14	exit;
15	}
16
17	/**
18	* Give_Email_Access class
19	*
20	* This class handles email access, allowing donors access to their donation w/o logging in;
21	*
22	* Based on the work from Matt Gibbs - https://github.com/FacetWP/edd-no-logins
23	*
24	* @since 1.0
25	*/
26	class Give_Email_Access {
27
28	/**
29	* Token exists
30	*
31	* @since 1.0
32	* @access public
33	*
34	* @var bool
35	*/
36	public $token_exists = false;
37
38	/**
39	* Token email
40	*
41	* @since 1.0
42	* @access public
43	*
44	* @var bool
45	*/
46	public $token_email = false;
47
48	/**
49	* Token
50	*
51	* @since 1.0
52	* @access public
53	*
54	* @var bool
55	*/
56	public $token = false;
57
58	/**
59	* Error
60	*
61	* @since 1.0
62	* @access public
63	*
64	* @var string
65	*/
66	public $error = '';
67
68	/**
69	* Verify throttle
70	*
71	* @since 1.0
72	* @access public
73	*
74	* @var
75	*/
76	public $verify_throttle;
77
78	/**
79	* Limit throttle
80	*
81	* @since 1.8.17
82	* @access public
83	*
84	* @var
85	*/
86	public $limit_throttle;
87
88	/**
89	* Verify expiration
90	*
91	* @since 1.0
92	* @access private
93	*
94	* @var string
95	*/
96	private $token_expiration;
97
98	/**
99	* Class Constructor
100	*
101	* Set up the Give Email Access Class.
102	*
103	* @since 1.0
104	* @access public
105	*/
106	public function __construct() {
107
108	// Get it started.
109	add_action( 'wp', [ $this, 'setup' ] );
110	}
111
112	/**
113	* Setup hooks
114	*
115	* @since 2.4.0
116	*/
117	public function setup() {
118
119	$is_email_access_on_page = apply_filters( 'give_is_email_access_on_page', give_is_success_page() \|\| give_is_history_page() );
120
121	if ( $is_email_access_on_page ) {
122	// Get it started.
123	add_action( 'wp', [ $this, 'init' ], 14 );
124	}
125	}
126
127	/**
128	* Init
129	*
130	* Register defaults and filters
131	*
132	* @since 1.0
133	* @access public
134	*
135	* @return void
136	*/
137	public function init() {
138
139	// Bail Out, if user is logged in.
140	if ( is_user_logged_in() ) {
141	return;
142	}
143
144	// Are db columns setup?
145	$column_exists = Give()->donors->does_column_exist( 'token' );
146	if ( ! $column_exists ) {
147	$this->create_columns();
148	}
149
150	// Timeouts.
151	$this->verify_throttle = apply_filters( 'give_nl_verify_throttle', 300 );
152	$this->limit_throttle = apply_filters( 'give_nl_limit_throttle', 3 );
153	$this->token_expiration = apply_filters( 'give_nl_token_expiration', 7200 );
154
155	// Setup login.
156	$this->check_for_token();
157
158	if ( $this->token_exists ) {
159	add_filter( 'give_user_pending_verification', '__return_false' );
160	add_filter( 'give_get_users_donations_args', [ $this, 'users_donations_args' ] );
161	}
162
163	}
164
165	/**
166	* Prevent email spamming.
167	*
168	* @param int $donor_id Donor ID.
169	*
170	* @since 1.0
171	* @access public
172	*
173	* @return bool
174	*/
175	public function can_send_email( $donor_id ) {
176
177	$donor = Give()->donors->get_donor_by( 'id', $donor_id );
178
179	if ( is_object( $donor ) ) {
180
181	$email_throttle_count = (int) give_get_meta( $donor_id, '_give_email_throttle_count', true );
182
183	$cache_key = "give_cache_email_throttle_limit_exhausted_{$donor_id}";
184	if (
185	$email_throttle_count < $this->limit_throttle &&
186	true !== Give_Cache::get( $cache_key )
187	) {
188	give_update_meta( $donor_id, '_give_email_throttle_count', $email_throttle_count + 1 );
189	} else {
190	give_update_meta( $donor_id, '_give_email_throttle_count', 0 );
191	Give_Cache::set( $cache_key, true, $this->verify_throttle );
192	return false;
193	}
194	}
195
196	return true;
197	}
198
199	/**
200	* Send the user's token
201	*
202	* @param int $donor_id Donor id.
203	* @param string $email Donor email.
204	*
205	* @since 1.0
206	* @access public
207	*
208	* @return bool
209	*/
210	public function send_email( $donor_id, $email ) {
211	return apply_filters( 'give_email-access_email_notification', $donor_id, $email );
212	}
213
214	/**
215	* This function is used to fetch the token value from query string or cookies based on availability.
216	*
217	* @since 2.4.1
218	* @access public
219	*
220	* @return string
221	*/
222	public function get_token() {
223
224	$token = isset( $_GET['give_nl'] ) ? give_clean( $_GET['give_nl'] ) : '';
225
226	// Check for cookie.
227	if ( empty( $token ) ) {
228	$token = isset( $_COOKIE['give_nl'] ) ? give_clean( $_COOKIE['give_nl'] ) : '';
229	}
230
231	return $token;
232	}
233
234	/**
235	* Has the user authenticated?
236	*
237	* @since 1.0
238	* @access public
239	*
240	* @return bool
241	*/
242	public function check_for_token() {
243
244	$token = $this->get_token();
245
246	// Must have a token.
247	if ( ! empty( $token ) ) {
248
249	if ( ! $this->is_valid_token( $token ) ) {
250	if ( ! $this->is_valid_verify_key( $token ) ) {
251	return false;
252	}
253	}
254
255	// Set Receipt Access Session.
256	Give()->session->maybe_start_session();
257	Give()->session->set( 'receipt_access', true );
258	$this->token_exists = true;
259
260	// Set cookie.
261	$lifetime = current_time( 'timestamp' ) + Give()->session->set_expiration_time();
262	@setcookie( 'give_nl', $token, $lifetime, COOKIEPATH, COOKIE_DOMAIN, false );
263
264	return true;
265	}
266
267	return false;
268	}
269
270	/**
271	* Is this a valid token?
272	*
273	* @since 1.0
274	* @access public
275	*
276	* @param $token string The token.
277	*
278	* @return bool
279	*/
280	public function is_valid_token( $token ) {
281
282	global $wpdb;
283
284	// Make sure token isn't expired.
285	$expires = date( 'Y-m-d H:i:s', time() - $this->token_expiration );
286
287	$email = $wpdb->get_var(
288	$wpdb->prepare( "SELECT email FROM {$wpdb->donors} WHERE verify_key = %s AND verify_throttle >= %s LIMIT 1", $token, $expires )
289	);
290
291	if ( ! empty( $email ) ) {
292	$this->token_email = $email;
293	$this->token = $token;
294	return true;
295	}
296
297	// Set error only if email access form isn't being submitted.
298	if (
299	! isset( $_POST['give_email'] ) &&
300	! isset( $_POST['_wpnonce'] )
301	) {
302	give_set_error( 'give_email_token_expired', apply_filters( 'give_email_token_expired_message', __( 'Your access token has expired. Please request a new one.', 'give' ) ) );
303	}
304
305	return false;
306
307	}
308
309	/**
310	* Add the verify key to DB
311	*
312	* @param int $donor_id Donor id.
313	* @param string $email Donor email.
314	* @param string $verify_key The verification key.
315	*
316	* @since 1.0
317	* @access public
318	*
319	* @return void
320	*/
321	public function set_verify_key( $donor_id, $email, $verify_key ) {
322	global $wpdb;
323
324	$now = date( 'Y-m-d H:i:s' );
325
326	// Insert or update?
327	$row_id = (int) $wpdb->get_var(
328	$wpdb->prepare( "SELECT id FROM {$wpdb->donors} WHERE id = %d LIMIT 1", $donor_id )
329	);
330
331	// Update.
332	if ( ! empty( $row_id ) ) {
333	$wpdb->query(
334	$wpdb->prepare( "UPDATE {$wpdb->donors} SET verify_key = %s, verify_throttle = %s WHERE id = %d LIMIT 1", $verify_key, $now, $row_id )
335	);
336	} // Insert.
337	else {
338	$wpdb->query(
339	$wpdb->prepare( "INSERT INTO {$wpdb->donors} ( verify_key, verify_throttle) VALUES (%s, %s)", $verify_key, $now )
340	);
341	}
342	}
343
344	/**
345	* Is this a valid verify key?
346	*
347	* @since 1.0
348	* @access public
349	*
350	* @param $token string The token.
351	*
352	* @return bool
353	*/
354	public function is_valid_verify_key( $token ) {
355	/* @var WPDB $wpdb */
356	global $wpdb;
357
358	// See if the verify_key exists.
359	$row = $wpdb->get_row(
360	$wpdb->prepare( "SELECT id, email FROM {$wpdb->donors} WHERE verify_key = %s LIMIT 1", $token )
361	);
362
363	$now = date( 'Y-m-d H:i:s' );
364
365	// Set token and remove verify key.
366	if ( ! empty( $row ) ) {
367	$wpdb->query(
368	$wpdb->prepare( "UPDATE {$wpdb->donors} SET verify_key = '', token = %s, verify_throttle = %s WHERE id = %d LIMIT 1", $token, $now, $row->id )
369	);
370
371	$this->token_email = $row->email;
372	$this->token = $token;
373
374	return true;
375	}
376
377	return false;
378	}
379
380	/**
381	* Users donations args
382	*
383	* Force Give to find donations by email, not user ID.
384	*
385	* @since 1.0
386	* @access public
387	*
388	* @param $args array User Donations arguments.
389	*
390	* @return mixed
391	*/
392	public function users_donations_args( $args ) {
393	$args['user'] = $this->token_email;
394	return $args;
395	}
396
397	/**
398	* Create required columns
399	*
400	* Create the necessary columns for email access
401	*
402	* @since 1.0
403	* @access public
404	*
405	* @return void
406	*/
407	public function create_columns() {
408
409	global $wpdb;
410
411	// Create columns in donors table.
412	$wpdb->query( "ALTER TABLE {$wpdb->donors} ADD `token` VARCHAR(255) CHARACTER SET utf8 NOT NULL, ADD `verify_key` VARCHAR(255) CHARACTER SET utf8 NOT NULL AFTER `token`, ADD `verify_throttle` DATETIME NOT NULL AFTER `verify_key`" );
413	}
414	}
415