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authorAlan Pearce2023-09-13 06:52:32 +0200
committerAlan Pearce2023-09-13 06:59:32 +0200
commitc48a92fdd4d9ab9ec96c1cff73af84b9cdd1a96d (patch)
tree81b2eec287858c6461bfcaab7d04aad5ad4e8e67
parent7c376d43ed17ffb44933f3ac8c1c8b8590dd675e (diff)
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Send 304 when file time not greater than if-modified-since header
-rw-r--r--src/index.ts18
1 files changed, 15 insertions, 3 deletions
diff --git a/src/index.ts b/src/index.ts
index 8b8ab0b..790c856 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -15,7 +15,7 @@ type File = {
   filename: string;
   headers?: Record<string, string>;
   size: number;
-  mtime: string;
+  mtime: Date;
 };
 
 let files = new Map<string, File>();
@@ -33,7 +33,7 @@ function registerFile(pathname: string, filename: string, stat: Stats): void {
         ? Object.assign({}, defaultHeaders, { "cache-control": "no-cache" })
         : undefined,
     size: stat.size,
-    mtime: stat.mtime.toUTCString(),
+    mtime: stat.mtime,
   });
 }
 
@@ -67,7 +67,7 @@ async function serveFile(
   if (file && (await fsp.exists(file.filename))) {
     return new Response(Bun.file(file.filename), {
       headers: {
-        "last-modified": file.mtime,
+        "last-modified": file.mtime.toUTCString(),
         ...(file.headers || defaultHeaders),
       },
       status: statusCode,
@@ -77,10 +77,22 @@ async function serveFile(
   }
 }
 
+function parseIfModifiedSinceHeader(header: string | null): number {
+  return header ? new Date(header).getTime() + 999 : 0;
+}
+
 export default withHtmlLiveReload({
   fetch: async function (request) {
     const pathname = new URL(request.url).pathname;
     const file = files.get(pathname);
+    if (file) {
+      const ims = parseIfModifiedSinceHeader(
+        request.headers.get("if-modified-since"),
+      );
+      if (ims >= file?.mtime.getTime()) {
+        return new Response("", { status: 304 });
+      }
+    }
     return serveFile(file);
   },
 });