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export type LogMetadata = Record<string, unknown>
export type Logger = {
debug: (message: string, metadata?: LogMetadata) => void
info: (message: string, metadata?: LogMetadata) => void
warn: (message: string, metadata?: LogMetadata) => void
error: (message: string, metadata?: LogMetadata) => void
}
const SENSITIVE_KEY_PARTS = [
"api_key",
"apikey",
"authorization",
"authheader",
"cookie",
"credential",
"email",
"jwt",
"password",
"refresh_token",
"secret",
"session",
"token",
] as const
const REDACTED = "[redacted]"
const AUTHORIZATION_PATTERN =
/\b(authorization\s*[:=]\s*)(["']?)(bearer\s+)?[^"'\s,;)]+\2/gi
const COOKIE_PATTERN =
/\b(cookie|set-cookie)\s*[:=]\s*[^,\n\r]+?(?=\s+[a-z][a-z0-9+.-]*:\/\/|\s+\w+\s*[:=]|$|,)/gi
const SENSITIVE_QUERY_PARAM_PATTERN =
/([?&](?:api[_-]?key|authorization|auth|cookie|credential|jwt|password|refresh[_-]?token|secret|session|(?:[a-z0-9]+[_-])+token|token)=)[^&#\s)]+/gi
const SENSITIVE_ASSIGNMENT_PATTERN =
/(["']?)(api[_-]?key|authorization|auth|cookie|credential|jwt|password|refresh[_-]?token|secret|session|(?:[a-z0-9]+[_-])+token|token)\1(\s*[:=]\s*)(["']?)(?:bearer\s+)?[^"'\s,;)}[\]]+\4/gi
const URL_CREDENTIAL_PATTERN =
/\b([a-z][a-z0-9+.-]*:\/\/)([^/@\s:]+):([^/@\s]+)@/gi
const EMAIL_PATTERN = /\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b/gi
export function isSensitiveLogKey(key: string): boolean {
const normalized = key.replaceAll(/[^a-zA-Z0-9]/g, "").toLowerCase()
return SENSITIVE_KEY_PARTS.some((part) =>
normalized.includes(part.replaceAll("_", ""))
)
}
export function redactLogMetadata<T>(value: T): T {
return redactValue(value, new WeakSet()) as T
}
export function redactLogText(value: string): string {
return value
.replaceAll(URL_CREDENTIAL_PATTERN, "$1[redacted]@")
.replaceAll(SENSITIVE_ASSIGNMENT_PATTERN, "$1$2$1$3$4[redacted]$4")
.replaceAll(AUTHORIZATION_PATTERN, "$1$2$3[redacted]$2")
.replaceAll(COOKIE_PATTERN, "$1=[redacted]")
.replaceAll(SENSITIVE_QUERY_PARAM_PATTERN, "$1[redacted]")
.replaceAll(EMAIL_PATTERN, REDACTED)
}
export function serializeLogError(error: unknown): LogMetadata {
if (error instanceof Error) {
return {
name: error.name,
message: redactLogText(error.message),
...(error.stack ? { stack: redactLogText(error.stack) } : {}),
...(error.cause !== undefined
? { cause: redactLogMetadata(error.cause) }
: {}),
}
}
if (error && typeof error === "object") {
return {
value: redactLogMetadata(error),
}
}
return {
value: redactLogText(String(error)),
}
}
export function createLogger(namespace: string): Logger {
return {
debug: (message, metadata) =>
writeLog("debug", namespace, message, metadata),
info: (message, metadata) => writeLog("info", namespace, message, metadata),
warn: (message, metadata) => writeLog("warn", namespace, message, metadata),
error: (message, metadata) =>
writeLog("error", namespace, message, metadata),
}
}
function writeLog(
level: LogLevel,
namespace: string,
message: string,
metadata?: LogMetadata
) {
const payload = {
level,
namespace,
message: redactLogText(message),
...(metadata ? { metadata: redactLogMetadata(metadata) } : {}),
}
const line = JSON.stringify(payload)
if (level === "error") {
console.error(line)
return
}
if (level === "warn") {
console.warn(line)
return
}
console.log(line)
}
function redactValue(value: unknown, seen: WeakSet<object>): unknown {
if (Array.isArray(value)) {
return value.map((item) => redactValue(item, seen))
}
if (!value || typeof value !== "object") {
if (typeof value === "string") {
return redactLogText(value)
}
return value
}
if (seen.has(value)) {
return "[circular]"
}
seen.add(value)
return Object.fromEntries(
Object.entries(value).map(([key, nested]) => [
key,
isSensitiveLogKey(key) ? REDACTED : redactValue(nested, seen),
])
)
}
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