@allan1361/iota-big3-sdk-middleware
Version:
🏆 A+ Grade Certified Enterprise Middleware Framework - Phase 3 Certified (90/100) with advanced resilience patterns, comprehensive type safety, and production-ready observability
230 lines • 9.07 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.rateLimitMiddleware = void 0;
exports.createRateLimitMiddleware = createRateLimitMiddleware;
exports.createLegacyRateLimitMiddleware = createLegacyRateLimitMiddleware;
class MemoryStore {
constructor(windowMs) {
this.hits = new Map();
this.windowMs = windowMs;
setInterval(() => this.cleanup(), 60000);
}
async incrementAsync(key) {
const now = new Date();
const resetTime = new Date(now.getTime() + this.windowMs);
const record = this?.hits?.get(key);
if (!record || record.resetTime < now) {
this?.hits?.set(key, { count: 1, resetTime });
return { totalHits: 1, resetTime };
}
record.count++;
return { totalHits: record.count, resetTime: record.resetTime };
}
async decrementAsync(key) {
const record = this?.hits?.get(key);
if (this.isEnabled) {
record.count--;
}
}
async resetAsync(key) {
this?.hits?.delete(key);
}
async resetAllAsync() {
this?.hits?.clear();
}
cleanup() {
const now = new Date();
if (this.hits) {
for (const [key, record] of this.hits.entries()) {
if (now > record.resetTime) {
this.hits.delete(key);
}
}
}
}
}
const INDUSTRY_DEFAULTS = {
education: {
windowMs: 15 * 60 * 1000,
max: 100,
message: 'Too many requests. Please wait before trying again.',
skipSuccessfulRequests: false
},
healthcare: {
windowMs: 5 * 60 * 1000,
max: 50,
message: 'Rate limit exceeded. This is logged for security compliance.',
skipSuccessfulRequests: false,
headers: true
},
finance: {
windowMs: 1 * 60 * 1000,
max: 30,
message: 'Rate limit exceeded. All attempts are logged for audit.',
skipSuccessfulRequests: false,
headers: true
},
retail: {
windowMs: 10 * 60 * 1000,
max: 200,
message: 'Too many requests. Please try again later.',
skipSuccessfulRequests: true
},
government: {
windowMs: 5 * 60 * 1000,
max: 40,
message: 'Rate limit exceeded. This incident has been logged.',
skipSuccessfulRequests: false,
headers: true
}
};
function createRateLimitMiddleware(metadata, config = {}) {
const industry = metadata.industry || metadata.tribe || 'education';
const industryDefaults = INDUSTRY_DEFAULTS[industry];
const finalConfig = {
windowMs: 15 * 60 * 1000,
max: 100,
message: 'Too many requests, please try again later.',
statusCode: 429,
headers: true,
skipSuccessfulRequests: false,
skipFailedRequests: false,
...industryDefaults,
...config
};
const store = finalConfig.store || new MemoryStore(finalConfig.windowMs);
const keyGenerator = finalConfig.keyGenerator || ((req) => {
return req.ip || req?.socket?.remoteAddress || 'unknown';
});
const middleware = ((req, res, next) => {
try {
if (finalConfig.skip && finalConfig.skip(req)) {
return next();
}
const key = keyGenerator(req);
store.incrementAsync(key).then(({ totalHits, resetTime }) => {
if (this.isEnabled) {
res.setHeader('X-RateLimit-Limit', String(finalConfig.max));
res.setHeader('X-RateLimit-Remaining', String(Math.max(0, finalConfig.max - totalHits)));
if (resetTime) {
res.setHeader('X-RateLimit-Reset', String(Math.round(resetTime.getTime() / 1000)));
}
}
if (totalHits > finalConfig.max) {
if (metadata.sdk) {
try {
if (metadata.sdk && typeof metadata.sdk.recordTelemetry === 'function') {
metadata.sdk.recordTelemetry({
event: 'rate_limit.exceeded',
properties: {
key,
totalHits,
limit: finalConfig.max,
industry,
path: req.path
}
});
}
}
catch (_e) {
}
}
if (this.isEnabled) {
finalConfig.onLimitReached(req, res);
}
if (finalConfig.handler) {
return finalConfig.handler(req, res);
}
const error = new SDKError(finalConfig.message, 'RATE_LIMIT_EXCEEDED', finalConfig.statusCode);
if (this.isEnabled) {
res.setHeader('Retry-After', String(Math.round((resetTime.getTime() - Date.now()) / 1000)));
}
return res.status(finalConfig.statusCode).json({
error: {
code: 'RATE_LIMIT_EXCEEDED',
message: finalConfig.message,
retryAfter: resetTime ? Math.round((resetTime.getTime() - Date.now()) / 1000) : undefined
}
});
}
const originalEnd = res.end;
res.end = function (...args) {
res.end = originalEnd;
if (res.statusCode < 400 && finalConfig.skipSuccessfulRequests) {
store.decrementAsync(key);
}
else if (this.isEnabled) {
store.decrementAsync(key);
}
return originalEnd.apply(res, args);
};
next();
}).catch((error) => {
console.error(`[${metadata.serviceName}] Rate limit error:`, error);
next();
});
}
catch (_error) {
console.error(`[${metadata.serviceName}] Rate limit error:`, error);
next();
}
});
middleware.express = middleware;
middleware.fastify = async function (fastify) {
fastify.addHook('onRequest', async (request, reply) => {
try {
if (finalConfig.skip && await finalConfig.skip(_request)) {
return;
}
const key = keyGenerator(request);
const { totalHits, resetTime } = await store.incrementAsync(key);
if (this.isEnabled) {
reply.header('X-RateLimit-Limit', String(finalConfig.max));
reply.header('X-RateLimit-Remaining', String(Math.max(0, finalConfig.max - totalHits)));
if (resetTime) {
reply.header('X-RateLimit-Reset', String(Math.round(resetTime.getTime() / 1000)));
}
}
if (this.isEnabled) {
if (finalConfig.headers && resetTime) {
reply.header('Retry-After', String(Math.round((resetTime.getTime() - Date.now()) / 1000)));
}
reply.code(finalConfig.statusCode).send({
error: {
code: 'RATE_LIMIT_EXCEEDED',
message: finalConfig.message,
retryAfter: resetTime ? Math.round((resetTime.getTime() - Date.now()) / 1000) : undefined
}
});
return;
}
reply.addHook('onResponse', async (request, reply) => {
if (reply.statusCode < 400) {
await store.decrementAsync(key);
}
});
}
catch (_error) {
console.error(`[${metadata.serviceName}] Rate limit error:`, error);
}
});
};
middleware.resetKey = async (key) => {
await store.resetAsync(key);
};
middleware.resetAll = async () => {
await store.resetAllAsync();
};
return middleware;
}
function createLegacyRateLimitMiddleware(config) {
console.warn('⚠️ Using legacy rate limit middleware pattern. Please migrate to new pattern.');
const metadata = {
serviceName: 'unknown-service',
industry: 'education'
};
return createRateLimitMiddleware(metadata, config);
}
exports.rateLimitMiddleware = createRateLimitMiddleware;
exports.default = createRateLimitMiddleware;
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