Enable serving of index.html pages for requests ending in /

This then allow static web sites to be served properly from an R2
bucket.

src/index.ts

@@ -5,6 +5,7 @@ interface Env {
   ALLOWED_ORIGINS?: string,
   CACHE_CONTROL?: string,
   PATH_PREFIX?: string
+  INDEX_FILE?: string
 }
 
 type ParsedRange = { offset: number, length: number } | { suffix: number };
@@ -36,7 +37,7 @@ export default {
     }
 
     const url = new URL(request.url);
-    if (url.pathname === "/") {
+    if (!env.INDEX_FILE && url.pathname === "/") {
       return new Response("OK");
     }
 
@@ -48,7 +49,12 @@ export default {
 
     if (!response || !response.ok) {
       console.warn("Cache miss");
-      const path = (env.PATH_PREFIX || "") + decodeURIComponent(url.pathname.substring(1));
+      var path = (env.PATH_PREFIX || "") + decodeURIComponent(url.pathname.substring(1));
+
+      // Look for index file if asked for a directory
+      if (env.INDEX_FILE && (path.endsWith("/") || path === "")) {
+        path += env.INDEX_FILE;
+      }
 
       let file: R2Object | R2ObjectBody | null | undefined;
 

wrangler.toml

@@ -18,6 +18,10 @@ CACHE_CONTROL = "max-age=86400"
 # The string to prepend to each file path. Optional, nothing is prepended to the path if unset.
 PATH_PREFIX = ""
 
+# Index file to search for on directory requests, set to "" to disable indexes
+#INDEX_FILE = ""
+INDEX_FILE = "index.html"
+
 [[r2_buckets]]
 binding = "R2_BUCKET"
 bucket_name = "kot"         # Set this to your R2 bucket name. Required