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import { LogTransaction } from '../logger/types'
import { Request, Response, NextFunction } from 'express'
import crypto from 'crypto'
declare global {
namespace Express {
interface Request {
transactionId?: string
}
}
}
export const transactionLoggerMiddleware = (
microservice: string,
operation: string,
elasticLogger: ElasticLogger | null
) => {
return (req: Request, res: Response, next: NextFunction) => {
if (!elasticLogger) {
return next()
}
const startTime = Date.now()
const transactionId =
(req.headers['x-transaction-id'] as string) ||
(req.headers['x-request-id'] as string) ||
`tx_${Date.now()}_${Math.random().toString(36).slice(2, 11)}`
req.transactionId = transactionId
const SENSITIVE_KEYS = new Set<string>([
'password',
'newPassword',
'token',
'secret',
'authorization',
'cpf',
'ssn',
'creditCard',
'cvv',
'pin',
])
const sanitize = (value: unknown, depth = 0): unknown => {
if (depth > 6) return '[DEPTH_LIMIT]'
if (value === null || typeof value !== 'object') return value
if (Array.isArray(value)) {
return value.slice(0, 100).map((v) => sanitize(v, depth + 1))
}
const obj = value as Record<string, unknown>
const out: Record<string, unknown> = {}
for (const [k, v] of Object.entries(obj)) {
if (SENSITIVE_KEYS.has(k)) {
out[k] = '[REDACTED]'
} else {
out[k] = sanitize(v, depth + 1)
}
}
return out
}
const toLimitedJson = (obj: unknown, maxBytes = 64 * 1024): string => {
try {
const s = JSON.stringify(obj)
if (Buffer.byteLength(s, 'utf8') <= maxBytes) return s
const preview = s.slice(0, maxBytes)
const hash = crypto.createHash('sha256').update(s).digest('hex')
return `${preview}...[TRUNCATED:${hash}]`
} catch {
return '[UNSERIALIZABLE]'
}
}
const requestMeta = {
method: req.method,
path: req.originalUrl,
baseUrl: req.baseUrl,
route: (req as { route?: { path?: string } }).route?.path,
host: req.get('host'),
referrer: req.get('referer') || req.get('referrer'),
ip: req.ip || req.socket.remoteAddress,
xForwardedFor: req.get('x-forwarded-for'),
userAgent: req.get('User-Agent'),
httpVersion: req.httpVersion,
}
const relevantHeaders = [
'x-user-id',
'x-appointment-id',
'x-platform',
'x-tenant-id',
'x-locale',
'x-correlation-id',
'x-trace-id',
'x-parent-span-id',
'x-span-id',
'authorization',
'content-type',
'accept',
]
const headerContext: Record<string, unknown> = {}
for (const h of relevantHeaders) {
const v = req.get(h)
if (v) headerContext[h] = h === 'authorization' ? '[REDACTED]' : v
}
const paramsSan = sanitize(req.params || {})
const querySan = sanitize(req.query || {})
const bodySan = typeof req.body === 'object' ? sanitize(req.body) : req.body
const requestPayload = {
params: paramsSan,
query: querySan,
body: bodySan,
paramsStr: toLimitedJson(paramsSan),
queryStr: toLimitedJson(querySan),
bodyStr: toLimitedJson(bodySan),
contentLength: req.get('content-length'),
}
res.once('finish', () => {
const duration = Date.now() - startTime
const status = res.statusCode >= 400 ? 'fail' : 'success'
const resContentLengthHeader = res.getHeader('content-length')
const responseSizeValue =
typeof resContentLengthHeader === 'string'
? parseInt(resContentLengthHeader, 10)
: typeof resContentLengthHeader === 'number'
? resContentLengthHeader
: undefined
const responseMeta: {
statusCode: number
data?: unknown
responseSize?: number
} = {
statusCode: res.statusCode,
...(typeof responseSizeValue === 'number'
? { responseSize: responseSizeValue }
: {}),
}
const context: Record<string, unknown> = {
...headerContext,
...requestPayload,
trace: {
requestId: req.headers['x-request-id'],
transactionId,
traceId: req.headers['x-trace-id'],
parentSpanId: req.headers['x-parent-span-id'],
spanId: req.headers['x-span-id'],
},
env: {
nodeEnv: process.env['NODE_ENV'],
serviceVersion: process.env['npm_package_version'],
podName: process.env['HOSTNAME'],
region: process.env['AWS_REGION'] || process.env['GCP_REGION'],
},
}
const transactionData: LogTransaction = {
name: operation,
microservice,
transactionId,
operation,
status,
duration,
context,
requestMeta,
responseMeta,
}
setImmediate(async () => {
try {
await elasticLogger.logTransaction(transactionData)
} catch (error) {
console.error('❌ Erro ao registrar log transacional:', {
transactionId,
microservice,
operation,
error: error instanceof Error ? error.message : 'Unknown error',
})
}
})
})
next()
}
}
export const addTransactionId = (
req: Request,
res: Response,
next: NextFunction
) => {
if (!req.transactionId) {
req.transactionId =
(req.headers['x-transaction-id'] as string) ||
(req.headers['x-request-id'] as string) ||
`tx_${Date.now()}_${Math.random().toString(36).slice(2, 11)}`
}
res.setHeader('X-Transaction-ID', req.transactionId)
next()
}
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