Fix decode path params in cache interceptor (opennextjs#868)

* decode path params in cache interceptor

* review fix

---------

Co-authored-by: Nicolas Dorseuil <nicolas@gitbook.io>

Author: conico974

.changeset/fast-clouds-shout.md

@@ -0,0 +1,5 @@
+---
+"@opennextjs/aws": patch
+---
+
+decode path params in cache interceptor

packages/open-next/src/core/routing/cacheInterceptor.ts

@@ -130,6 +130,39 @@ async function generateResult(
   };
 }
 
+/**
+ *
+ * https://github.com/vercel/next.js/blob/34039551d2e5f611c0abde31a197d9985918adaf/packages/next/src/shared/lib/router/utils/escape-path-delimiters.ts#L2-L10
+ */
+function escapePathDelimiters(
+  segment: string,
+  escapeEncoded?: boolean,
+): string {
+  return segment.replace(
+    new RegExp(`([/#?]${escapeEncoded ? "|%(2f|23|3f|5c)" : ""})`, "gi"),
+    (char: string) => encodeURIComponent(char),
+  );
+}
+
+/**
+ *
+ * SSG cache key needs to be decoded, but some characters needs to be properly escaped
+ * https://github.com/vercel/next.js/blob/34039551d2e5f611c0abde31a197d9985918adaf/packages/next/src/server/lib/router-utils/decode-path-params.ts#L11-L26
+ */
+function decodePathParams(pathname: string): string {
+  return pathname
+    .split("/")
+    .map((segment) => {
+      try {
+        return escapePathDelimiters(decodeURIComponent(segment), true);
+      } catch (e) {
+        // If decodeURIComponent fails, we return the original segment
+        return segment;
+      }
+    })
+    .join("/");
+}
+
 export async function cacheInterceptor(
   event: InternalEvent,
 ): Promise<InternalEvent | InternalResult> {
@@ -147,6 +180,9 @@ export async function cacheInterceptor(
   // We also need to remove trailing slash
   localizedPath = localizedPath.replace(/\/$/, "");
 
+  // Then we decode the path params
+  localizedPath = decodePathParams(localizedPath);
+
   debug("Checking cache for", localizedPath, PrerenderManifest);
 
   const isISR =