feat: Implement dedicated 404 page for routes under /_continuwuity/

src/web/mod.rs

@@ -20,6 +20,8 @@ enum WebError {
 	ValidationError(#[from] validator::ValidationErrors),
 	#[error("Bad request: {0}")]
 	BadRequest(String),
+	#[error("This page does not exist.")]
+	NotFound,
 	#[error("Internal server error: {0}")]
 	InternalError(#[from] conduwuit_core::Error),
 }
@@ -28,14 +30,13 @@ impl IntoResponse for WebError {
 	fn into_response(self) -> Response {
 		#[derive(Debug, Template)]
 		#[template(path = "error.html.j2")]
-		#[allow(unused)]
 		struct Error {
 			error: WebError,
 			status: StatusCode,
 		}
-
 		let status = match &self {
 			| Self::ValidationError(_) | Self::BadRequest(_) => StatusCode::BAD_REQUEST,
+			| Self::NotFound => StatusCode::NOT_FOUND,
 			| _ => StatusCode::INTERNAL_SERVER_ERROR,
 		};
 
@@ -57,6 +58,7 @@ pub fn build() -> Router<state::State> {
 		.merge(index::build())
 		.merge(resources::build())
 		.merge(password_reset::build())
+		.fallback(async || WebError::NotFound)
 		.layer(SetResponseHeaderLayer::if_not_present(
 			header::CONTENT_SECURITY_POLICY,
 			HeaderValue::from_static("default-src 'self'; img-src 'self' data:;"),