1 files changed, 24 insertions, 0 deletions
diff --git a/apps/web/lib/rate-limit.ts b/apps/web/lib/rate-limit.ts
new file mode 100644
index 0000000..4016781
--- /dev/null
+++ b/apps/web/lib/rate-limit.ts
@@ -0,0 +1,24 @@
+const requestTimestamps = new Map<string, number[]>()
+
+export function rateLimit(
+  identifier: string,
+  limit: number,
+  windowMilliseconds: number
+): { success: boolean; remaining: number } {
+  const now = Date.now()
+  const timestamps = requestTimestamps.get(identifier) ?? []
+  const windowStart = now - windowMilliseconds
+  const recentTimestamps = timestamps.filter(
+    (timestamp) => timestamp > windowStart
+  )
+
+  if (recentTimestamps.length >= limit) {
+    requestTimestamps.set(identifier, recentTimestamps)
+    return { success: false, remaining: 0 }
+  }
+
+  recentTimestamps.push(now)
+  requestTimestamps.set(identifier, recentTimestamps)
+
+  return { success: true, remaining: limit - recentTimestamps.length }
+}