66 lines
3.3 KiB
PHP
66 lines
3.3 KiB
PHP
<?php
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// Meta extension, https://github.com/datenstrom/yellow-extensions/tree/master/source/meta
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class YellowMeta {
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const VERSION = "0.8.14";
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public $yellow; // access to API
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// Handle initialisation
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public function onLoad($yellow) {
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$this->yellow = $yellow;
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$this->yellow->system->setDefault("metaDefaultImage", "favicon");
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}
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// Handle page extra data
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public function onParsePageExtra($page, $name) {
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$output = null;
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if ($name=="header" && !$page->isError()) {
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list($imageUrl, $imageAlt) = $this->getImageInformation($page);
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$locale = $this->yellow->language->getText("languageLocale", $page->get("language"));
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$output .= "<meta property=\"og:url\" content=\"".htmlspecialchars($page->getUrl().$this->yellow->toolbox->getLocationArguments())."\" />\n";
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$output .= "<meta property=\"og:locale\" content=\"".htmlspecialchars($locale)."\" />\n";
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$output .= "<meta property=\"og:type\" content=\"website\" />\n";
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$output .= "<meta property=\"og:title\" content=\"".$page->getHtml("title")."\" />\n";
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$output .= "<meta property=\"og:site_name\" content=\"".$page->getHtml("sitename")."\" />\n";
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$output .= "<meta property=\"og:description\" content=\"".$page->getHtml("description")."\" />\n";
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$output .= "<meta property=\"og:image\" content=\"".htmlspecialchars($imageUrl)."\" />\n";
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$output .= "<meta property=\"og:image:alt\" content=\"".htmlspecialchars($imageAlt)."\" />\n";
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}
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return $output;
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}
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// Handle page output data
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public function onParsePageOutput($page, $text) {
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$output = null;
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if ($text && preg_match("/^(.*?)<html(.*?)>(.*)$/s", $text, $matches)) {
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$output = $matches[1]."<html".$matches[2]." prefix=\"og: http://ogp.me/ns#\">".$matches[3];
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}
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return $output;
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}
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// Return image information for page
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public function getImageInformation($page) {
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if ($page->isExisting("image")) {
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$name = $page->get("image");
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$alt = $page->isExisting("imageAlt") ? $page->get("imageAlt") : $page->get("title");
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} elseif (preg_match("/\[image(\s.*?)\]/", $page->getContent(true), $matches)) {
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list($name, $alt) = $this->yellow->toolbox->getTextArguments(trim($matches[1]));
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if (empty($alt)) $alt = $page->get("title");
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} else {
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$name = $this->yellow->system->get("metaDefaultImage");
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$alt = $page->isExisting("imageAlt") ? $page->get("imageAlt") : $page->get("title");
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}
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if (!preg_match("/^\w+:/", $name)) {
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$location = $name!="favicon" ? $this->yellow->system->get("coreImageLocation").$name :
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$this->yellow->system->get("coreThemeLocation").$this->yellow->lookup->normaliseName($page->get("theme")).".png";
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$url = $this->yellow->lookup->normaliseUrl(
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$this->yellow->system->get("coreServerScheme"),
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$this->yellow->system->get("coreServerAddress"),
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$this->yellow->system->get("coreServerBase"), $location);
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} else {
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$url = $this->yellow->lookup->normaliseUrl("", "", "", $name);
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}
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return array($url, $alt);
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}
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}
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