From: Ben Sherratt <redacted>
Date: Sun, 23 Jul 2023 12:07:50 +0000 (+0100)
Subject: post metadata support (not very good yet)
X-Git-Url: https://git.bts.cx/cx.git/commitdiff_plain/27850f5b260560bdf75f3fca169ec5950ed00b22

post metadata support (not very good yet)
---

diff --git a/cx/lib/posts.php b/cx/lib/posts.php
index 6aca72e..2c2dc82 100644
--- a/cx/lib/posts.php
+++ b/cx/lib/posts.php
@@ -10,6 +10,16 @@ function mk_markdown($markdown) {
 	return $Parsedown->text($markdown);
 }
 
+class PostMetadata {
+	public $hero_image;
+	public $hero_image_alt;
+
+	public function __construct($dict) {
+		$this->hero_image = $dict['post_hero_image'];
+		$this->hero_image_alt = $dict['post_hero_image_alt'];
+	}
+}
+
 class Post {
 	public $id;
 	public $title;
@@ -36,6 +46,22 @@ class Post {
 			$this->html_excerpt = mk_markdown($segments[0]);
 		}
 	}
+
+	public function get_metadata() {
+		$data = [];
+
+		$doc = new DOMDocument();
+		$doc->loadHTML($this->html_content);
+
+		$image_tag = $doc->getElementsByTagName('img')[0];
+
+		if ($image_tag != null) {
+			$data['post_hero_image'] = $image_tag->getAttribute('src');
+			$data['post_hero_image_alt'] = htmlspecialchars($image_tag->getAttribute('alt'));
+		}
+
+		return new PostMetadata($data);
+	}
 }
 
 function cx_post_make_slug($title) {
diff --git a/cx/lib/template.php b/cx/lib/template.php
index e368a2e..76e5318 100644
--- a/cx/lib/template.php
+++ b/cx/lib/template.php
@@ -1,6 +1,6 @@
 <?php
 
-function cx_template_render($class, $name, $variables = []) {
+function cx_template_render($class, $name, $variables = null) {
 	global $cx_template_base, $cx_template_content;
 	
 	$base_template = null;
@@ -11,10 +11,12 @@ function cx_template_render($class, $name, $variables = []) {
 		$path = join(DIRECTORY_SEPARATOR, $segments);
 		
 		$base_template = null;
+		$base_template_variables = null;
 
 		$cx_template_base_previous = $cx_template_base;
-		$cx_template_base = function($name) use (&$base_template ) {
+		$cx_template_base = function($name, $base_variables) use (&$base_template, &$base_template_variables) {
 			$base_template = $name;
+			$base_template_variables = $base_variables;
 		};
 
 		$cx_template_content_previous = $cx_template_content;
@@ -24,7 +26,10 @@ function cx_template_render($class, $name, $variables = []) {
 
 		cx_require('lib', 'url.php'); // For templates
 
-		extract($variables);
+		if ($variables != null) {
+			extract($variables);
+		}
+
 		ob_start();
 		include($path);
 		$output = ob_get_contents();
@@ -34,14 +39,15 @@ function cx_template_render($class, $name, $variables = []) {
 		$cx_template_content = $cx_template_content_previous;
 
 		$name = $base_template;
+		$variables = $base_template_variables;
 	}
 
 	return $output;
 }
 
-function cx_template_base($name) {
+function cx_template_base($name, $variables = null) {
 	global $cx_template_base;
-	$cx_template_base($name);
+	$cx_template_base($name, $variables);
 }
 
 function cx_template_content() {
diff --git a/cx/templates/public/base.php b/cx/templates/public/base.php
index 8c3794d..83fef3d 100644
--- a/cx/templates/public/base.php
+++ b/cx/templates/public/base.php
@@ -8,6 +8,21 @@
 	<title><?= cx_site_name(); ?></title>
 	<link rel="stylesheet" href="<?= cx_url('/design/css/style.css') ?>">
 	<link rel="alternate" type="application/rss+xml" title="bts.cx" href="<?= cx_url('/feed/') ?>" />
+
+	<?php if (isset($cx_post_meta)): ?>
+	
+	<meta property="og:title" content="<?= cx_site_name(); ?>">
+	<meta property="og:type" content="article" />
+	<meta property="og:image" content="<?= $cx_post_meta->hero_image; ?>">
+	<meta property="og:url" content="<?= cx_url_site($cx_post_permalink); ?>">
+	<meta name="twitter:card" content="summary_large_image">
+	<meta name="twitter:image:alt" content="<?= $cx_post_meta->hero_image_alt; ?>">
+
+	<?php /*<meta property="og:description" content="Offering tour packages for individuals or groups.">
+	<meta property="og:site_name" content="<?= cx_site_name(); ?>">
+	<meta name="twitter:image:alt" content="Alt text for image">*/ ?>
+
+	<?php endif; ?>
 </head>
 
 <body>
diff --git a/cx/templates/public/post.php b/cx/templates/public/post.php
index 9fb9fce..f44cb29 100644
--- a/cx/templates/public/post.php
+++ b/cx/templates/public/post.php
@@ -1,8 +1,9 @@
-<?php cx_template_base('base'); ?>
-<main>
 <?php $post = cx_posts_find_post($post_id); ?>
-<?php if ($post): ?>
+<?php $post_metadata = $post->get_metadata(); ?>
 <?php $post_permalink = '/' . date('Y', $post->date) . '/' . date('m', $post->date) . '/' . $post->slug; ?>
+<?php cx_template_base('base', ['cx_post_meta' => $post_metadata, 'cx_post_permalink' => $post_permalink]); ?>
+<main>
+<?php if ($post): ?>
 	<article>
 		<h1><a href="<?= cx_url($post_permalink) ?>"><?= $post->title ?></a></h1>
 		<p class="updated"><?= date('l, F jS, Y',$post->date) ?></p>