xref: /template/strap/action/metacanonical.php (revision a6bf47aa01c4ea7d24944b0e48eb1943151e3c25) 
1<?php
2
3use ComboStrap\MetadataUtility;
4use ComboStrap\PluginUtility;
5use ComboStrap\Page;
6
7if (!defined('DOKU_INC')) die();
8
9/**
10 *
11 *
12 */
13class action_plugin_combo_metacanonical extends DokuWiki_Action_Plugin
14{
15
16    /**
17     * The conf
18     */
19    const CANONICAL_LAST_NAMES_COUNT_CONF = 'MinimalNamesCountForAutomaticCanonical';
20
21
22    function __construct()
23    {
24        // enable direct access to language strings
25        // ie $this->lang
26        $this->setupLocale();
27    }
28
29    public function register(Doku_Event_Handler $controller)
30    {
31        $controller->register_hook('TPL_METAHEADER_OUTPUT', 'BEFORE', $this, 'metaCanonicalProcessing', array());
32    }
33
34    /**
35     * Dokuwiki has already a canonical methodology
36     * https://www.dokuwiki.org/canonical
37     *
38     * @param $event
39     */
40    function metaCanonicalProcessing($event)
41    {
42
43        global $ID;
44        if (empty($ID)){
45            // $_SERVER['SCRIPT_NAME']== "/lib/exe/mediamanager.php"
46            // $ID is null
47            return;
48        }
49
50        $page = new Page($ID);
51
52        /**
53         * No canonical for slot page
54         */
55        if ($page->isSlot()) {
56            return;
57        }
58
59        /**
60         * Where do we pick the canonical URL
61         */
62        /**
63         * Canonical from meta
64         *
65         * FYI: The creation of the link was extracted from
66         * {@link wl()} that call {@link idfilter()} that performs just a replacement
67         * Calling the wl function will not work because
68         * {@link wl()} use the constant DOKU_URL that is set before any test via getBaseURL(true)
69         */
70
71
72        $canonicalUrl = $page->getCanonicalUrlOrDefault();
73
74        /**
75         * Replace the meta entry
76         *
77         * First search the key of the meta array
78         */
79        $canonicalKey = "";
80        $canonicalRelArray = array("rel" => "canonical", "href" => $canonicalUrl);
81        foreach ($event->data['link'] as $key => $link) {
82            if ($link["rel"] == "canonical") {
83                $canonicalKey = $key;
84            }
85        }
86        if ($canonicalKey != "") {
87            // Update
88            $event->data['link'][$canonicalKey] = $canonicalRelArray;
89        } else {
90            // Add
91            $event->data['link'][] = $canonicalRelArray;
92        }
93
94        /**
95         * Add the Og canonical meta
96         * https://developers.facebook.com/docs/sharing/webmasters/getting-started/versioned-link/
97         */
98        $canonicalOgKeyKey = "";
99        $canonicalPropertyKey = "og:url";
100        $canonicalOgArray = array("property" => $canonicalPropertyKey, "content" => $canonicalUrl);
101        // Search if the canonical property is already present
102        foreach ($event->data['meta'] as $key => $meta) {
103            if (array_key_exists("property",$meta)) {
104                /**
105                 * We may have several properties
106                 */
107                if ($meta["property"] == $canonicalPropertyKey) {
108                    $canonicalOgKeyKey = $key;
109                }
110            }
111        }
112        if ($canonicalOgKeyKey != "") {
113            // Update
114            $event->data['meta'][$canonicalOgKeyKey] = $canonicalOgArray;
115        } else {
116            // Add
117            $event->data['meta'][] = $canonicalOgArray;
118        }
119
120    }
121
122}
123