Add PATCH request handler for short links

functions/api/short-links/[id].ts

@@ -15,3 +15,37 @@ export async function onRequestDelete(context: RequestContext) {
     status: 204,
   });
 }
+
+export async function onRequestPatch(context: RequestContext) {
+  const { body } = context.data;
+
+  if (!body) return jsonError("Request body missing", 400);
+
+  let data: { path: any };
+
+  try {
+    data = JSON.parse(body);
+  } catch {
+    return jsonError("Invalid JSON", 400);
+  }
+
+  if (Object.keys(data).find((k) => k !== "path"))
+    return jsonError("Only the `path` property can be modified.", 400);
+
+  const { path } = data;
+
+  if (typeof path !== "string")
+    return jsonError("The `path` property must be a string", 400);
+
+  if (path.length > 256) return jsonError("Path is too long", 400);
+
+  await context.env.D1.prepare(
+    "UPDATE short_links SET path = ? WHERE path = ? AND user = ?;",
+  )
+    .bind(path, context.params.id, context.data.current_user.id)
+    .run();
+
+  return new Response(null, {
+    status: 204,
+  });
+}