wip ocids image function

functions/v2/[[image]].js

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+
+// Configs for what to do with requests
+const ALLOWED_USERS = [
+    "ewpratten",
+    "bgptools"
+];
+const DEFAULT_USER = "ewpratten";
+
+// Info needed in order to partially parse OCIDS API endpoints.
+const POSSIBLE_ACTION_TOKENS = ["blobs", "manifests", "tags", "referrers"];
+
+export default {
+    async fetch(request, env) {
+
+        // Parse the path out of the url
+        const url = new URL(request.url);
+
+        // The first segment of the path is probably the user
+        var path_split = url.pathname.split("/");
+        
+        // The image name is the part between `/vx/` and the first action token
+        var image_name = "";
+        for (var token of path_split){
+            if (token == "v2"){
+                continue;
+            }
+            if (POSSIBLE_ACTION_TOKENS.includes(token)){
+                break;
+            }
+            image_name += token + "/";
+        }
+
+        // The action_url is everything after the image name
+        var action_url = url.pathname.replace(`/v2/${image_name}`, "");
+
+        // If there is a slash and the first part is not an allowed user, fail
+        var image_name_parts = image_name.split("/");
+        if (image_name_parts.length > 1 && !ALLOWED_USERS.includes(image_name_parts[0])){
+            return new Response(`User does not exist ${image_name_parts[0]}`, {status: 404});
+        }
+
+        // If there is no slash, add the default user to the image name
+        if (image_name_parts.length == 1){
+            image_name = `${DEFAULT_USER}/${image_name}`;
+        }
+
+        return Response.redirect(`https://ghcr.io/v2/${image_name}/${action_url}`, 302);
+    }
+}