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<h1><a href="../../index.html">All files</a> / <a href="index.html">src/middleware</a> rateLimiter.ts</h1>
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<span class="strong">0% </span>
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<span class='fraction'>0/68</span>
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<span class="strong">0% </span>
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<span class='fraction'>0/20</span>
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<span class='fraction'>0/15</span>
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<span class='fraction'>0/61</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js"><span class="cstat-no" title="statement not covered" >import rateLimit from 'express-rate-limit';</span>
import { Request, Response, NextFunction } from 'express';
<span class="cstat-no" title="statement not covered" >import Redis from 'redis';</span>
// Redis client for distributed rate limiting
let redisClient: Redis.RedisClientType | null = <span class="cstat-no" title="statement not covered" >null;</span>
// Initialize Redis client (optional - falls back to memory store)
export const <span class="cstat-no" title="statement not covered" >initializeRedis = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >a</span>sync </span>(redisUrl?: string): Promise<void> => {</span>
<span class="cstat-no" title="statement not covered" > try {</span>
<span class="cstat-no" title="statement not covered" > redisClient = Redis.createClient({</span>
url: redisUrl || process.env.REDIS_URL || 'redis://localhost:6379'
});
<span class="cstat-no" title="statement not covered" > redisClient.on('error', <span class="fstat-no" title="function not covered" >(e</span>rr) => {</span>
<span class="cstat-no" title="statement not covered" > console.warn('Redis rate limiter error:', err);</span>
// Don't throw - fallback to memory store
});
<span class="cstat-no" title="statement not covered" > await redisClient.connect();</span>
<span class="cstat-no" title="statement not covered" > console.log('Redis rate limiter initialized');</span>
} catch (error) {
<span class="cstat-no" title="statement not covered" > console.warn('Redis initialization failed, using memory store for rate limiting:', error);</span>
<span class="cstat-no" title="statement not covered" > redisClient = null;</span>
}
};
// Note: Redis store implementation removed for compatibility with express-rate-limit v7
// Memory store is used by default, which is suitable for single-instance deployments
// For distributed deployments, consider using a compatible Redis store package
// Rate limiting configurations for different endpoint types
export const <span class="cstat-no" title="statement not covered" >rateLimitConfigs = {</span>
// Very strict for sensitive operations
strict: {
windowMs: 15 * 60 * 1000, // 15 minutes
max: 10, // limit each IP to 10 requests per windowMs
message: {
error: 'Too many requests, please try again later.',
retryAfter: '15 minutes'
},
standardHeaders: true,
legacyHeaders: false
},
// Standard for most API endpoints
standard: {
windowMs: 15 * 60 * 1000, // 15 minutes
max: 100, // limit each IP to 100 requests per windowMs
message: {
error: 'Too many requests, please try again later.',
retryAfter: '15 minutes'
},
standardHeaders: true,
legacyHeaders: false
},
// Lenient for read-only operations
lenient: {
windowMs: 15 * 60 * 1000, // 15 minutes
max: 1000, // limit each IP to 1000 requests per windowMs
message: {
error: 'Too many requests, please try again later.',
retryAfter: '15 minutes'
},
standardHeaders: true,
legacyHeaders: false
}
};
// Create rate limiter with optional Redis store
export const <span class="cstat-no" title="statement not covered" >createRateLimiter = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >(</span>c</span>onfig: typeof rateLimitConfigs.standard, keyPrefix = <span class="branch-0 cbranch-no" title="branch not covered" >'rl')</span> => {</span>
const limiterConfig = <span class="cstat-no" title="statement not covered" >{</span>
...config,
keyGenerator: <span class="fstat-no" title="function not covered" >(r</span>eq: Request) => <span class="cstat-no" title="statement not covered" >`${keyPrefix}:${req.ip}:${req.path}`,</span>
// Note: Redis store implementation removed for compatibility with express-rate-limit v7
// Falls back to memory store, which is suitable for single-instance deployments
skip: <span class="fstat-no" title="function not covered" >(r</span>eq: Request) => {
// Skip rate limiting for health checks and internal endpoints
<span class="cstat-no" title="statement not covered" > return req.path === '/health' || req.path === '/metrics';</span>
}
};
<span class="cstat-no" title="statement not covered" > return rateLimit(limiterConfig);</span>
};
// Pre-configured rate limiters
export const <span class="cstat-no" title="statement not covered" >strictRateLimiter = createRateLimiter(rateLimitConfigs.strict, 'strict');</span>
export const <span class="cstat-no" title="statement not covered" >standardRateLimiter = createRateLimiter(rateLimitConfigs.standard, 'standard');</span>
export const <span class="cstat-no" title="statement not covered" >lenientRateLimiter = createRateLimiter(rateLimitConfigs.lenient, 'lenient');</span>
// Tally API rate limiting - token bucket implementation
class TallyApiRateLimiter {
private tokens: number;
private lastRefill: number;
private readonly maxTokens: number;
private readonly refillRate: number; // tokens per second
<span class="fstat-no" title="function not covered" > constructor(m</span>axTokens = <span class="branch-0 cbranch-no" title="branch not covered" >100,</span> refillRate = <span class="branch-0 cbranch-no" title="branch not covered" >1)</span> {
<span class="cstat-no" title="statement not covered" > this.maxTokens = maxTokens;</span>
<span class="cstat-no" title="statement not covered" > this.refillRate = refillRate;</span>
<span class="cstat-no" title="statement not covered" > this.tokens = maxTokens;</span>
<span class="cstat-no" title="statement not covered" > this.lastRefill = Date.now();</span>
}
private <span class="fstat-no" title="function not covered" >refillTokens(</span>): void {
const now = <span class="cstat-no" title="statement not covered" >Date.now();</span>
const timePassed = <span class="cstat-no" title="statement not covered" >(now - this.lastRefill) / 1000;</span> // convert to seconds
const tokensToAdd = <span class="cstat-no" title="statement not covered" >Math.floor(timePassed * this.refillRate);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (tokensToAdd > 0) {</span>
<span class="cstat-no" title="statement not covered" > this.tokens = Math.min(this.maxTokens, this.tokens + tokensToAdd);</span>
<span class="cstat-no" title="statement not covered" > this.lastRefill = now;</span>
}
}
<span class="fstat-no" title="function not covered" > canMakeRequest(</span>): boolean {
<span class="cstat-no" title="statement not covered" > this.refillTokens();</span>
<span class="cstat-no" title="statement not covered" > return this.tokens > 0;</span>
}
<span class="fstat-no" title="function not covered" > consumeToken(</span>): boolean {
<span class="cstat-no" title="statement not covered" > this.refillTokens();</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (this.tokens > 0) {</span>
<span class="cstat-no" title="statement not covered" > this.tokens--;</span>
<span class="cstat-no" title="statement not covered" > return true;</span>
}
<span class="cstat-no" title="statement not covered" > return false;</span>
}
<span class="fstat-no" title="function not covered" > getTokensRemaining(</span>): number {
<span class="cstat-no" title="statement not covered" > this.refillTokens();</span>
<span class="cstat-no" title="statement not covered" > return this.tokens;</span>
}
<span class="fstat-no" title="function not covered" > getTimeUntilNextToken(</span>): number {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (this.tokens > 0) <span class="cstat-no" title="statement not covered" >return 0;</span></span>
<span class="cstat-no" title="statement not covered" > return Math.ceil(1000 / this.refillRate); </span>// milliseconds until next token
}
}
// Global Tally API rate limiter instance
export const <span class="cstat-no" title="statement not covered" >tallyApiLimiter = new TallyApiRateLimiter(100, 1); </span>// 100 tokens, 1 per second
// Middleware to check Tally API rate limit before making requests
export const <span class="cstat-no" title="statement not covered" >tallyApiRateLimit = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >(</span>_</span>req: Request, res: Response, next: NextFunction): void => {</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!tallyApiLimiter.canMakeRequest()) {</span>
const waitTime = <span class="cstat-no" title="statement not covered" >tallyApiLimiter.getTimeUntilNextToken();</span>
<span class="cstat-no" title="statement not covered" > res.status(429).json({</span>
error: 'Tally API rate limit exceeded',
message: 'Too many requests to Tally API, please try again later',
retryAfter: Math.ceil(waitTime / 1000),
tokensRemaining: tallyApiLimiter.getTokensRemaining()
});
<span class="cstat-no" title="statement not covered" > return;</span>
}
// Consume token and proceed
<span class="cstat-no" title="statement not covered" > tallyApiLimiter.consumeToken();</span>
// Add rate limit info to response headers
<span class="cstat-no" title="statement not covered" > res.set({</span>
'X-Tally-RateLimit-Limit': '100',
'X-Tally-RateLimit-Remaining': tallyApiLimiter.getTokensRemaining().toString(),
'X-Tally-RateLimit-Reset': new Date(Date.now() + tallyApiLimiter.getTimeUntilNextToken()).toISOString()
});
<span class="cstat-no" title="statement not covered" > next();</span>
};
// Composite middleware that applies both our rate limiting and Tally API limiting
export const <span class="cstat-no" title="statement not covered" >createCompositeRateLimiter = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >(</span>c</span>onfig: typeof rateLimitConfigs.standard = <span class="branch-0 cbranch-no" title="branch not covered" >rateLimitConfigs.standard)</span> => {</span>
const ourLimiter = <span class="cstat-no" title="statement not covered" >createRateLimiter(config);</span>
<span class="cstat-no" title="statement not covered" > return [ourLimiter, tallyApiRateLimit];</span>
};
// Enhanced error handler for rate limiting
export const <span class="cstat-no" title="statement not covered" >rateLimitErrorHandler = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >(</span>e</span>rr: any, req: Request, res: Response, next: NextFunction): void => {</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (err && err.status === 429) {</span>
<span class="cstat-no" title="statement not covered" > res.status(429).json({</span>
error: 'Rate limit exceeded',
message: err.message || 'Too many requests, please try again later',
retryAfter: err.retryAfter || 900, // 15 minutes default
timestamp: new Date().toISOString(),
path: req.path,
ip: req.ip
});
<span class="cstat-no" title="statement not covered" > return;</span>
}
<span class="cstat-no" title="statement not covered" > next(err);</span>
};
// Utility to get current rate limit status
export const <span class="cstat-no" title="statement not covered" >getRateLimitStatus = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >(</span>r</span>eq: Request): object => {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
ip: req.ip,
path: req.path,
tallyApiTokensRemaining: tallyApiLimiter.getTokensRemaining(),
tallyApiTimeUntilNextToken: tallyApiLimiter.getTimeUntilNextToken(),
headers: {
rateLimit: req.get('X-RateLimit-Limit'),
rateLimitRemaining: req.get('X-RateLimit-Remaining'),
rateLimitReset: req.get('X-RateLimit-Reset')
}
};
}; </pre></td></tr></table></pre>
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