Asset timestamping

.env.example

@@ -2,4 +2,6 @@ SALT=64_byte_string
 DATABASE_URL=postgres://xxx:xxx@localhost/xxx
 
 METALS_API_KEY=xxx
-NUMISTA_API_KEY=xxx
+NUMISTA_API_KEY=xxx
+
+ASSET_DIR=/opt/melt/public

src/middleware.rs

@@ -82,6 +82,33 @@ impl ClientCtx {
         format!("{:.2}", AU_TO_USD.load(Ordering::Relaxed) as f32 / 1000.0)
     }
 
+    pub fn get_asset_timestamp(&self) -> u64 {
+        let asset = "assets/style.css";
+        match std::fs::metadata(format!(
+            "{}/{}",
+            std::env::var("ASSET_DIR").unwrap_or_else(|_| ".".to_string()),
+            asset
+        )) {
+            Ok(metadata) => match metadata.modified() {
+                Ok(time) => match time.duration_since(std::time::UNIX_EPOCH) {
+                    Ok(distance) => distance.as_secs(),
+                    Err(_) => {
+                        log::warn!("Unable to do math on webpack chat.js modified at timestamp");
+                        0
+                    }
+                },
+                Err(_) => {
+                    log::warn!("Unable to read metadata on webpack chat.js");
+                    0
+                }
+            },
+            Err(_) => {
+                log::warn!("Unable to open webpack chat.js for timestamp");
+                0
+            }
+        }
+    }
+
     /// Returns Duration representing request time.
     pub fn request_time(&self) -> Duration {
         Instant::now() - self.0.request_start

templates/container/public.html

@@ -15,7 +15,8 @@
     </script>
 
     {% block stylesheets %}
-    <link rel="stylesheet" type="text/css" href="/assets/style.css" nonce="{{ client.get_nonce() }}" />
+    <link rel="stylesheet" type="text/css" href="/assets/style.css?{{ client.get_asset_timestamp()}}"
+        nonce="{{ client.get_nonce() }}" />
     {#
     <link rel="stylesheet" type="text/css" href="/assets/print.css" media="print" nonce="{{ client.get_nonce() }}" /> #}
     {% endblock %}