feat: Add option for a noindex meta tag on the HTML index page

Adds a new config option `index_page_allow_indexing` which defaults to false.

Fixes: !1527

src/web/pages/index.rs

@@ -18,11 +18,13 @@ async fn index_handler(
 	struct Index<'a> {
 		server_name: &'a str,
 		first_run: bool,
+		allow_indexing: bool,
 	}
 
 	let template = Index {
 		server_name: services.globals.server_name().as_str(),
 		first_run: services.firstrun.is_first_run(),
+		allow_indexing: services.config.index_page_allow_indexing,
 	};
 	Ok(Html(template.render()?))
 }

src/web/pages/password_reset.rs

@@ -27,6 +27,7 @@ struct PasswordResetQuery {
 struct PasswordReset<'a> {
 	user_card: UserCard<'a>,
 	body: PasswordResetBody,
+	allow_indexing: bool,
 }
 
 #[derive(Debug)]
@@ -74,6 +75,7 @@ async fn password_reset_form(
 	let template = PasswordReset {
 		user_card,
 		body: PasswordResetBody::Form(reset_form),
+		allow_indexing: services.config.index_page_allow_indexing,
 	};
 
 	Ok(Html(template.render()?))
@@ -112,6 +114,7 @@ async fn post_password_reset(
 			let template = PasswordReset {
 				user_card,
 				body: PasswordResetBody::Success,
+				allow_indexing: services.config.index_page_allow_indexing,
 			};
 
 			Ok(Html(template.render()?).into_response())

src/web/pages/templates/_layout.html.j2

@@ -5,6 +5,9 @@
     <meta charset="UTF-8" />
     <title>{% block title %}Continuwuity{% endblock %}</title>
     <meta name="viewport" content="width=device-width, initial-scale=1" />
+    {%- if allow_indexing %}
+    <meta name="robots" content="noindex" />
+    {%- endif %}
 
     <link rel="icon" href="/_continuwuity/resources/logo.svg">
     <link rel="stylesheet" href="/_continuwuity/resources/common.css">