add preview image for inscription page

src/subcommand/server/templates.rs

@@ -49,6 +49,10 @@ pub(crate) trait PageContent: Display + 'static {
   {
     PageHtml::new(self, chain, has_satoshi_index)
   }
+
+  fn preview_image_url(&self) -> Option<Trusted<String>> {
+    None
+  }
 }
 
 #[cfg(test)]

src/subcommand/server/templates/inscription.rs

@@ -11,6 +11,10 @@ impl PageContent for InscriptionHtml {
   fn title(&self) -> String {
     format!("Inscription {}", self.inscription_id)
   }
+
+  fn preview_image_url(&self) -> Option<Trusted<String>> {
+    Some(Trusted(format!("/content/{}", self.inscription_id)))
+  }
 }
 
 #[cfg(test)]

templates/page.html

@@ -4,6 +4,9 @@
     <meta charset=utf-8>
     <meta name=format-detection content='telephone=no'>
     <meta name=viewport content='width=device-width,initial-scale=1.0'>
+%% if let Some(url) = self.content.preview_image_url() {
+    <meta property=og:image content='{{ url }}'>
+%% }
     <title>{{ self.content.title() }}</title>
     <link href=/static/index.css rel=stylesheet>
     <link href=/static/modern-normalize.css rel=stylesheet>

tests/server.rs

@@ -54,7 +54,8 @@ fn inscription_page() {
   TestServer::spawn_with_args(&rpc_server, &[]).assert_response_regex(
     &format!("/inscription/{reveal_tx}"),
     &format!(
-      ".*<h1>Inscription {reveal_tx}</h1>
+      ".*<meta property=og:image content='/content/{reveal_tx}'>.*
+<h1>Inscription {reveal_tx}</h1>
 <dl>
   <dt>content size</dt>
   <dd>10 bytes</dd>