Initial ChronoSeal release

server/src/ratelimit.rs

@@ -0,0 +1,27 @@
+use std::collections::HashMap;
+use std::time::Instant;
+
+pub struct RateLimiter {
+    buckets: HashMap<String, (u32, Instant)>,
+    limit: u32,
+    window_secs: u64,
+}
+
+impl RateLimiter {
+    pub fn new(limit: u32, window_secs: u64) -> Self {
+        Self { buckets: HashMap::new(), limit, window_secs }
+    }
+    pub fn check(&mut self, key: &str) -> bool {
+        let now = Instant::now();
+        let entry = self.buckets.entry(key.to_string()).or_insert((0, now));
+        if now.duration_since(entry.1).as_secs() >= self.window_secs {
+            *entry = (1, now);
+            true
+        } else if entry.0 >= self.limit {
+            false
+        } else {
+            entry.0 += 1;
+            true
+        }
+    }
+}