wpsso / lib / link-rel.php

link-rel.php in WPSSO Core – Complete Schema Markup and Meta Tags 22.7.0, at lib/link-rel.php

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1	<?php
2	/*
3	* License: GPLv3
4	* License URI: https://www.gnu.org/licenses/gpl.txt
5	* Copyright 2012-2026 Jean-Sebastien Morisset (https://wpsso.com/)
6	*/
7
8	if ( ! defined( 'ABSPATH' ) ) {
9
10	die( 'These aren\'t the droids you\'re looking for.' );
11	}
12
13	if ( ! defined( 'WPSSO_PLUGINDIR' ) ) {
14
15	die( 'Do. Or do not. There is no try.' );
16	}
17
18	if ( ! class_exists( 'WpssoLinkRel' ) ) {
19
20	class WpssoLinkRel {
21
22	private $p; // Wpsso class object.
23
24	public function __construct( &$plugin ) {
25
26	$this->p =& $plugin;
27
28	if ( $this->p->debug->enabled ) {
29
30	$this->p->debug->mark();
31	}
32
33	/*
34	* Always disable the WordPress shortlink meta tag.
35	*/
36	if ( $this->p->debug->enabled ) {
37
38	$this->p->debug->log( 'removing default wp_shortlink_wp_head action' );
39	}
40
41	remove_action( 'wp_head', 'wp_shortlink_wp_head' );
42
43	add_action( 'wp_head', array( $this, 'maybe_disable_rel_canonical' ), -1000 );
44
45	if ( ! empty( $this->p->avail[ 'amp' ][ 'any' ] ) ) {
46
47	add_action( 'amp_post_template_head', array( $this, 'maybe_disable_rel_canonical' ), -1000 );
48	}
49	}
50
51	/*
52	* Maybe disable the WordPress and AMP canonical tags.
53	*
54	* Called by 'wp_head' and 'amp_post_template_head' actions.
55	*/
56	public function maybe_disable_rel_canonical() {
57
58	if ( $this->p->debug->enabled ) {
59
60	$this->p->debug->mark();
61	}
62
63	/*
64	* WpssoUtil->is_canonical_disabled() returns true if:
65	*
66	* - An SEO plugin is active.
67	* - The 'add_link_rel_canonical' option is unchecked.
68	* - The 'wpsso_add_link_rel_canonical' filter returns false.
69	* - The 'wpsso_canonical_disabled' filter returns true.
70	*/
71	if ( $this->p->util->is_canonical_disabled() ) {
72
73	if ( $this->p->debug->enabled ) {
74
75	$this->p->debug->log( 'exiting early: canonical is disabled' );
76	}
77
78	return;
79	}
80
81	/*
82	* If WPSSO is providing the canonical URL, then disable the WordPress and AMP canonical meta tags.
83	*/
84	$current = function_exists( 'current_action' ) ? current_action() : current_filter();
85
86	switch( $current ) {
87
88	case 'wp_head':
89
90	remove_filter( $current, 'rel_canonical' );
91	remove_action( $current, 'amp_frontend_add_canonical' );
92
93	break;
94
95	case 'amp_post_template_head':
96
97	remove_action( $current, 'amp_post_template_add_canonical' );
98
99	break;
100	}
101	}
102
103	/*
104	* Link Relation URL Tags.
105	*/
106	public function get_array( array $mod, array $mt_og = array(), $author_id = false ) {
107
108	if ( $this->p->debug->enabled ) {
109
110	$this->p->debug->mark();
111	}
112
113	$link_rel = apply_filters( 'wpsso_link_rel_seed', array(), $mod );
114
115	/*
116	* Link rel canonical.
117	*
118	* WpssoUtil->is_canonical_disabled() returns true if:
119	*
120	* - An SEO plugin is active.
121	* - The 'add_link_rel_canonical' option is unchecked.
122	* - The 'wpsso_add_link_rel_canonical' filter returns false.
123	* - The 'wpsso_canonical_disabled' filter returns true.
124	*/
125	if ( ! $this->p->util->is_canonical_disabled() ) {
126
127	$link_rel[ 'canonical' ] = $this->p->util->get_canonical_url( $mod );
128
129	} elseif ( $this->p->debug->enabled ) {
130
131	$this->p->debug->log( 'skipping canonical: canonical is disabled' );
132	}
133
134	/*
135	* Link rel shortlink.
136	*
137	* WpssoUtil->is_shortlink_disabled() returns true if:
138	*
139	* - The 'add_link_rel_shortlink' option is unchecked.
140	* - The 'wpsso_add_link_rel_shortlink' filter returns false.
141	* - The 'wpsso_shortlink_disabled' filter returns true.
142	*/
143	if ( ! $this->p->util->is_shortlink_disabled() ) {
144
145	$canonical_url = $this->p->util->get_canonical_url( $mod );
146
147	$shortlink = '';
148
149	if ( $mod[ 'is_post' ] && $mod[ 'id' ] ) {
150
151	$shortlink = $this->p->util->get_shortlink( $mod, $context = 'post' );
152
153	} elseif ( ! empty( $canonical_url ) ) { // Just in case.
154
155	/*
156	* Shorten URL using the selected shortening service.
157	*/
158	if ( $this->p->debug->enabled ) {
159
160	$this->p->debug->log( 'calling WpssoUtil->shorten_url() to shorten the canonical URL' );
161	}
162
163	$shortlink = $this->p->util->shorten_url( $canonical_url, $mod );
164	}
165
166	if ( empty( $shortlink ) ) {
167
168	if ( $this->p->debug->enabled ) {
169
170	$this->p->debug->log( 'skipping shortlink: short url is empty' );
171	}
172
173	} elseif ( $shortlink === $canonical_url ) {
174
175	if ( $this->p->debug->enabled ) {
176
177	$this->p->debug->log( 'skipping shortlink: short url is identical to canonical url' );
178	}
179
180	} else {
181
182	$link_rel[ 'shortlink' ] = $shortlink;
183	}
184
185	} elseif ( $this->p->debug->enabled ) {
186
187	$this->p->debug->log( 'skipping shortlink: shortlink is disabled' );
188	}
189
190	return apply_filters( 'wpsso_link_rel', $link_rel, $mod );
191	}
192	}
193	}
194