redirecting back to cast after checkout

src/app/api/[message]/checkout/route.tsx

@@ -15,15 +15,35 @@ export async function POST(
   if (!fcMessage.valid) {
     return new Response("Invalid message", { status: 442 });
   }
-
-  // Get the message URL so we can then redirect to it!
-  const posterProfile = await getUserProfile(
-    fcMessage.message.data.frameActionBody?.castId?.fid
-  );
-  console.log(JSON.stringify(posterProfile, null, 2));
   const checkoutRedirect = new URL(request.url);
-  checkoutRedirect.searchParams.append("cast", "redirect");
 
+  try {
+    // Get the message URL so we can then redirect to it!
+    const posterProfile = await getUserProfile(
+      fcMessage.message.data.frameActionBody?.castId?.fid
+    );
+    const userName = posterProfile.messages
+      .sort((a: any, b: any) => a.data.timestamp > b.data.timestamp)
+      .find((m: any) => {
+        return (
+          m.data.type === "MESSAGE_TYPE_USER_DATA_ADD" &&
+          m.data.userDataBody.type === "USER_DATA_TYPE_USERNAME"
+        );
+      }).data.userDataBody.value;
+    checkoutRedirect.searchParams.append(
+      "cast",
+      `https://warpcast.com/${userName}/${fcMessage.message.data.frameActionBody?.castId.hash}`
+    );
+  } catch (error) {
+    console.error(
+      `Could not build the redirect URL for ${JSON.stringify(
+        fcMessage.message.data,
+        null,
+        2
+      )}`
+    );
+    console.error(error);
+  }
   return Response.redirect(checkoutRedirect.toString(), 302);
 }
 
@@ -32,6 +52,14 @@ export async function GET(
   { params }: { params: { message: string } }
 ) {
   const message = await getMessage(params.message);
+  const checkoutUrl = new URL(message.checkoutUrl);
+
+  const u = new URL(request.url);
+  const cast = u.searchParams.get("cast");
+  if (cast) {
+    // We have a cast URL to redirect to!
+    checkoutUrl.searchParams.append("redirect-url", cast!);
+  }
 
-  return Response.redirect(message.checkoutUrl, 302);
+  return Response.redirect(checkoutUrl.toString(), 302);
 }