feat(WEB-104): add on-demand revalidation for cache

app/api/revalidate/route.ts

@@ -0,0 +1,45 @@
+import { env } from "@/env/server"
+import { revalidateTag } from 'next/cache'
+
+import type { NextRequest } from 'next/server'
+
+export async function POST(request: NextRequest) {
+  try {
+    const secret = request.nextUrl.searchParams.get("secret") ?? ""
+    const tag = request.nextUrl.searchParams.get("tag") ?? ""
+
+    if (secret !== env.REVALIDATE_SECRET) {
+      return Response.json(
+        {
+          message: 'Invalid secret',
+          now: Date.now(),
+          revalidated: false,
+        },
+        {
+          status: 401,
+        }
+      )
+    }
+
+    if (!tag) {
+      return Response.json(
+        {
+          message: 'Missing tag param',
+          now: Date.now(),
+          revalidated: false,
+        },
+        {
+          status: 400,
+        }
+      )
+    }
+
+    revalidateTag(tag)
+
+    return Response.json({ revalidated: true, now: Date.now() })
+  } catch (error) {
+    console.info("Failed to revalidate tag")
+    console.error(error)
+    return Response.json({ revalidated: false, now: Date.now() }, { status: 500 })
+  }
+}