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backend/node_modules/@fastify/rate-limit/store/LocalStore.js

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+'use strict'
+
+const { LruMap: Lru } = require('toad-cache')
+
+function LocalStore (continueExceeding, exponentialBackoff, cache = 5000) {
+  this.continueExceeding = continueExceeding
+  this.exponentialBackoff = exponentialBackoff
+  this.lru = new Lru(cache)
+}
+
+LocalStore.prototype.incr = function (ip, cb, timeWindow, max) {
+  const nowInMs = Date.now()
+  let current = this.lru.get(ip)
+
+  if (!current) {
+    // Item doesn't exist
+    current = { current: 1, ttl: timeWindow, iterationStartMs: nowInMs }
+  } else if (current.iterationStartMs + timeWindow <= nowInMs) {
+    // Item has expired
+    current.current = 1
+    current.ttl = timeWindow
+    current.iterationStartMs = nowInMs
+  } else {
+    // Item is alive
+    ++current.current
+
+    // Reset TLL if max has been exceeded and `continueExceeding` is enabled
+    if (this.continueExceeding && current.current > max) {
+      current.ttl = timeWindow
+      current.iterationStartMs = nowInMs
+    } else if (this.exponentialBackoff && current.current > max) {
+      // Handle exponential backoff
+      const backoffExponent = current.current - max - 1
+      const ttl = timeWindow * (2 ** backoffExponent)
+      current.ttl = Number.isSafeInteger(ttl) ? ttl : Number.MAX_SAFE_INTEGER
+      current.iterationStartMs = nowInMs
+    } else {
+      current.ttl = timeWindow - (nowInMs - current.iterationStartMs)
+    }
+  }
+
+  this.lru.set(ip, current)
+  cb(null, current)
+}
+
+LocalStore.prototype.child = function (routeOptions) {
+  return new LocalStore(routeOptions.continueExceeding, routeOptions.exponentialBackoff, routeOptions.cache)
+}
+
+module.exports = LocalStore