ic: add meta tags

src/handlers/ic/MainHandler.php

@@ -12,7 +12,7 @@ class MainHandler
         $this->skin->meta->title = lang('meta_index_title');
         $this->skin->meta->description = lang('meta_index_description');
         $this->skin->meta->url = 'https://'.$_SERVER['HTTP_HOST'].'/';
-        // $this->skin->meta->image = 'https://'.$config['domain'].'/img/4in1-preview.jpg';
+        $this->skin->meta->image = 'https://'.$_SERVER['HTTP_HOST'].'/images/simurgh.jpg';
         $this->skin->meta->setSocial('og:type', 'website');
 
         $this->skin->options->isIndex = true;
@@ -47,6 +47,14 @@ class MainHandler
             throw new NotFound();
         $title = $tzo->getPartWithDots($part).'_'.$tzo->strings['part_'.$part]['label'];
         $html = $tzo->getPartHtml($part);
+
+        $this->skin->meta->title = $title.' - '.lang('tzo');
+        $this->skin->meta->description = TZO::getDescriptionPreviewFromHtml($html, 155);
+        $this->skin->meta->url = 'https://'.$_SERVER['HTTP_HOST'].'/tbc/'.$part.'/';
+        $image = TZO::getFirstImageUrlFromHtml($html);
+        if ($image)
+            $this->skin->meta->image = 'https://'.$_SERVER['HTTP_HOST'].$image;
+
         $this->skin->title = $title.' - '.lang('tzo');
         $this->skin->set([
             'tzo' => $tzo,

src/lib/ic/TZO.php

@@ -87,6 +87,19 @@ class TZO
         return $html;
     }
 
+    public static function getDescriptionPreviewFromHtml(string $html, int $len): string {
+        $text = trim(MarkupUtil::htmlToText($html));
+        if (mb_strlen($text) >= $len)
+            return mb_substr($text, 0, $len - 3).'...';
+        return $text;
+    }
+
+    public static function getFirstImageUrlFromHtml(string $html): ?string {
+        if (preg_match('/<img[^>]+src=[\'"]([^\'"]+)[\'"]/i', $html, $m))
+            return $m[1];
+        return null;
+    }
+
     protected function getImageSize(string $local_path): array {
         list($w, $h) = getimagesize($local_path);
         return [$w, $h];

src/strings/ic.yaml

@@ -1,10 +1,11 @@
 # common
 invisible_college: Invisible College
 site_title: Invisible College
-meta_index_title: ""
-meta_index_description: ""
+meta_index_title: "Invisible College"
+meta_index_description: "Invisible College by idb & friends"
 
 books: Works
 tzo: "There Beyond Clouds"
 tzo_full_title: "There Beyond Clouds: A Brief Guide"
-tzo_brief_guide: "A Brief Guide"
+tzo_brief_guide: "A Brief Guide"
+tzo_meta_part_description: "There Beyond Clouds, section %s"