register_hook('TPL_METAHEADER_OUTPUT', 'BEFORE', $this, 'htmlHeadMetadataProcessing', array());
}
function htmlHeadMetadataProcessing($event)
{
global $ID;
if (empty($ID)) {
// $_SERVER['SCRIPT_NAME']== "/lib/exe/mediamanager.php"
// $ID is null
return;
}
$page = Page::createPageFromId($ID);
/**
* No metadata for slot page
*/
if ($page->isSecondarySlot()) {
return;
}
/**
* Add the canonical metadata value
*/
$this->canonicalHeadMetadata($event, $page);
/**
* Add the app name value
*/
$this->appNameMetadata($event, $page);
}
/**
* Dokuwiki has already a canonical methodology
* https://www.dokuwiki.org/canonical
*
*/
private function canonicalHeadMetadata($event, Page $page)
{
/**
* Where do we pick the canonical URL
* Canonical from meta
*
* FYI: The creation of the link was extracted from
* {@link wl()} that call {@link idfilter()} that performs just a replacement
* Calling the wl function will not work because
* {@link wl()} use the constant DOKU_URL that is set before any test via getBaseURL(true)
*/
$canonicalUrl = $page->getAbsoluteCanonicalUrl();
/**
* Replace the meta entry
*
* First search the key of the meta array
*/
$canonicalKey = "";
$canonicalRelArray = array("rel" => "canonical", "href" => $canonicalUrl);
foreach ($event->data['link'] as $key => $link) {
if ($link["rel"] == "canonical") {
$canonicalKey = $key;
}
}
if ($canonicalKey != "") {
// Update
$event->data['link'][$canonicalKey] = $canonicalRelArray;
} else {
// Add
$event->data['link'][] = $canonicalRelArray;
}
/**
* Add the Og canonical meta
* https://developers.facebook.com/docs/sharing/webmasters/getting-started/versioned-link/
*/
$canonicalOgKeyKey = "";
$canonicalPropertyKey = "og:url";
$canonicalOgArray = array("property" => $canonicalPropertyKey, "content" => $canonicalUrl);
// Search if the canonical property is already present
foreach ($event->data['meta'] as $key => $meta) {
if (array_key_exists("property", $meta)) {
/**
* We may have several properties
*/
if ($meta["property"] == $canonicalPropertyKey) {
$canonicalOgKeyKey = $key;
}
}
}
if ($canonicalOgKeyKey != "") {
// Update
$event->data['meta'][$canonicalOgKeyKey] = $canonicalOgArray;
} else {
// Add
$event->data['meta'][] = $canonicalOgArray;
}
}
/**
* Add the following meta
*
*
*
* @param $event
* @param Page $page
* @return void
*/
private function appNameMetadata($event, Page $page)
{
$applicationName = Site::getName();
$applicationMetaNameValues = [
self::APPLE_MOBILE_WEB_APP_TITLE_META,
self::APPLICATION_NAME_META
];
$metaNameKeyProperty = "name";
foreach ($applicationMetaNameValues as $applicationNameValue){
$appMobileWebAppTitle = array($metaNameKeyProperty => $applicationNameValue, "content" => $applicationName);;
try {
$metaKey = $this->getMetaArrayIndex($metaNameKeyProperty, $applicationNameValue, $event->data['meta']);
// Update
$event->data['meta'][$metaKey] = $appMobileWebAppTitle;
} catch (ExceptionComboNotFound $e) {
// Add
$event->data['meta'][] = $appMobileWebAppTitle;
}
}
}
/**
* @throws ExceptionComboNotFound
*/
private function getMetaArrayIndex(string $key, string $value, $metas)
{
// Search if the canonical property is already present
foreach ($metas as $key => $meta) {
if (array_key_exists($key, $meta)) {
/**
* We may have several properties
*/
if ($meta[$key] == $value) {
return $key;
}
}
}
throw new ExceptionComboNotFound(`The meta key $key with the value $value was not found`);
}
}