Elijah
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36 lines
1 KiB
TypeScript
36 lines
1 KiB
TypeScript
/**
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* In-memory sliding window rate limiter.
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* Single-instance, single-user container — no need for Redis.
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*/
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interface RateLimitEntry {
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timestamps: number[];
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}
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const store = new Map<string, RateLimitEntry>();
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const WINDOW_MS = 60 * 1000; // 1 minute
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const MAX_REQUESTS = 10;
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export function checkRateLimit(
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key: string,
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options: { windowMs?: number; maxRequests?: number } = {}
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): { allowed: boolean; retryAfterMs: number } {
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const now = Date.now();
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const windowMs = options.windowMs ?? WINDOW_MS;
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const maxRequests = options.maxRequests ?? MAX_REQUESTS;
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const entry = store.get(key) ?? { timestamps: [] };
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// Remove timestamps outside the window
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entry.timestamps = entry.timestamps.filter((t) => now - t < windowMs);
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if (entry.timestamps.length >= maxRequests) {
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const oldestInWindow = entry.timestamps[0];
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const retryAfterMs = windowMs - (now - oldestInWindow);
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return { allowed: false, retryAfterMs };
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}
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entry.timestamps.push(now);
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store.set(key, entry);
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return { allowed: true, retryAfterMs: 0 };
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}
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