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import net from 'net'
import tls from 'tls'
import crypto from 'crypto'
import Stream from 'stream'
import { performance } from 'perf_hooks'
import { stringify, handleValue, arrayParser, arraySerializer } from './types.js'
import { Errors } from './errors.js'
import Result from './result.js'
import Queue from './queue.js'
import { Query, CLOSE } from './query.js'
import b from './bytes.js'
export default Connection
let uid = 1
const Sync = b().S().end()
, Flush = b().H().end()
, SSLRequest = b().i32(8).i32(80877103).end(8)
, ExecuteUnnamed = Buffer.concat([b().E().str(b.N).i32(0).end(), Sync])
, DescribeUnnamed = b().D().str('S').str(b.N).end()
, noop = () => { /* noop */ }
const retryRoutines = new Set([
'FetchPreparedStatement',
'RevalidateCachedQuery',
'transformAssignedExpr'
])
const errorFields = {
83 : 'severity_local', // S
86 : 'severity', // V
67 : 'code', // C
77 : 'message', // M
68 : 'detail', // D
72 : 'hint', // H
80 : 'position', // P
112 : 'internal_position', // p
113 : 'internal_query', // q
87 : 'where', // W
115 : 'schema_name', // s
116 : 'table_name', // t
99 : 'column_name', // c
100 : 'data type_name', // d
110 : 'constraint_name', // n
70 : 'file', // F
76 : 'line', // L
82 : 'routine' // R
}
function Connection(options, queues = {}, { onopen = noop, onend = noop, onclose = noop } = {}) {
const {
ssl,
max,
user,
host,
port,
database,
parsers,
transform,
onnotice,
onnotify,
onparameter,
max_pipeline,
keep_alive,
backoff,
target_session_attrs
} = options
const sent = Queue()
, id = uid++
, backend = { pid: null, secret: null }
, idleTimer = timer(end, options.idle_timeout)
, lifeTimer = timer(end, options.max_lifetime)
, connectTimer = timer(connectTimedOut, options.connect_timeout)
let socket = null
, cancelMessage
, result = new Result()
, incoming = Buffer.alloc(0)
, needsTypes = options.fetch_types
, backendParameters = {}
, statements = {}
, statementId = Math.random().toString(36).slice(2)
, statementCount = 1
, closedDate = 0
, remaining = 0
, hostIndex = 0
, retries = 0
, length = 0
, delay = 0
, rows = 0
, serverSignature = null
, nextWriteTimer = null
, terminated = false
, incomings = null
, results = null
, initial = null
, ending = null
, stream = null
, chunk = null
, ended = null
, nonce = null
, query = null
, final = null
const connection = {
queue: queues.closed,
idleTimer,
connect(query) {
initial = query
reconnect()
},
terminate,
execute,
cancel,
end,
count: 0,
id
}
queues.closed && queues.closed.push(connection)
return connection
async function createSocket() {
let x
try {
x = options.socket
? (await Promise.resolve(options.socket(options)))
: new net.Socket()
} catch (e) {
error(e)
return
}
x.on('error', error)
x.on('close', closed)
x.on('drain', drain)
return x
}
async function cancel({ pid, secret }, resolve, reject) {
try {
cancelMessage = b().i32(16).i32(80877102).i32(pid).i32(secret).end(16)
await connect()
socket.once('error', reject)
socket.once('close', resolve)
} catch (error) {
reject(error)
}
}
function execute(q) {
if (terminated)
return queryError(q, Errors.connection('CONNECTION_DESTROYED', options))
if (q.cancelled)
return
try {
q.state = backend
query
? sent.push(q)
: (query = q, query.active = true)
build(q)
return write(toBuffer(q))
&& !q.describeFirst
&& !q.cursorFn
&& sent.length < max_pipeline
&& (!q.options.onexecute || q.options.onexecute(connection))
} catch (error) {
sent.length === 0 && write(Sync)
errored(error)
return true
}
}
function toBuffer(q) {
if (q.parameters.length >= 65534)
throw Errors.generic('MAX_PARAMETERS_EXCEEDED', 'Max number of parameters (65534) exceeded')
return q.options.simple
? b().Q().str(q.statement.string + b.N).end()
: q.describeFirst
? Buffer.concat([describe(q), Flush])
: q.prepare
? q.prepared
? prepared(q)
: Buffer.concat([describe(q), prepared(q)])
: unnamed(q)
}
function describe(q) {
return Buffer.concat([
Parse(q.statement.string, q.parameters, q.statement.types, q.statement.name),
Describe('S', q.statement.name)
])
}
function prepared(q) {
return Buffer.concat([
Bind(q.parameters, q.statement.types, q.statement.name, q.cursorName),
q.cursorFn
? Execute('', q.cursorRows)
: ExecuteUnnamed
])
}
function unnamed(q) {
return Buffer.concat([
Parse(q.statement.string, q.parameters, q.statement.types),
DescribeUnnamed,
prepared(q)
])
}
function build(q) {
const parameters = []
, types = []
const string = stringify(q, q.strings[0], q.args[0], parameters, types, options)
!q.tagged && q.args.forEach(x => handleValue(x, parameters, types, options))
q.prepare = options.prepare && ('prepare' in q.options ? q.options.prepare : true)
q.string = string
q.signature = q.prepare && types + string
q.onlyDescribe && (delete statements[q.signature])
q.parameters = q.parameters || parameters
q.prepared = q.prepare && q.signature in statements
q.describeFirst = q.onlyDescribe || (parameters.length && !q.prepared)
q.statement = q.prepared
? statements[q.signature]
: { string, types, name: q.prepare ? statementId + statementCount++ : '' }
typeof options.debug === 'function' && options.debug(id, string, parameters, types)
}
function write(x, fn) {
chunk = chunk ? Buffer.concat([chunk, x]) : Buffer.from(x)
if (fn || chunk.length >= 1024)
return nextWrite(fn)
nextWriteTimer === null && (nextWriteTimer = setImmediate(nextWrite))
return true
}
function nextWrite(fn) {
const x = socket.write(chunk, fn)
nextWriteTimer !== null && clearImmediate(nextWriteTimer)
chunk = nextWriteTimer = null
return x
}
function connectTimedOut() {
errored(Errors.connection('CONNECT_TIMEOUT', options, socket))
socket.destroy()
}
async function secure() {
write(SSLRequest)
const canSSL = await new Promise(r => socket.once('data', x => r(x[0] === 83))) // S
if (!canSSL && ssl === 'prefer')
return connected()
socket.removeAllListeners()
socket = tls.connect({
socket,
servername: net.isIP(socket.host) ? undefined : socket.host,
...(ssl === 'require' || ssl === 'allow' || ssl === 'prefer'
? { rejectUnauthorized: false }
: ssl === 'verify-full'
? {}
: typeof ssl === 'object'
? ssl
: {}
)
})
socket.on('secureConnect', connected)
socket.on('error', error)
socket.on('close', closed)
socket.on('drain', drain)
}
/* c8 ignore next 3 */
function drain() {
!query && onopen(connection)
}
function data(x) {
if (incomings) {
incomings.push(x)
remaining -= x.length
if (remaining > 0)
return
}
incoming = incomings
? Buffer.concat(incomings, length - remaining)
: incoming.length === 0
? x
: Buffer.concat([incoming, x], incoming.length + x.length)
while (incoming.length > 4) {
length = incoming.readUInt32BE(1)
if (length >= incoming.length) {
remaining = length - incoming.length
incomings = [incoming]
break
}
try {
handle(incoming.subarray(0, length + 1))
} catch (e) {
query && (query.cursorFn || query.describeFirst) && write(Sync)
errored(e)
}
incoming = incoming.subarray(length + 1)
remaining = 0
incomings = null
}
}
async function connect() {
terminated = false
backendParameters = {}
socket || (socket = await createSocket())
if (!socket)
return
connectTimer.start()
if (options.socket)
return ssl ? secure() : connected()
socket.on('connect', ssl ? secure : connected)
if (options.path)
return socket.connect(options.path)
socket.ssl = ssl
socket.connect(port[hostIndex], host[hostIndex])
socket.host = host[hostIndex]
socket.port = port[hostIndex]
hostIndex = (hostIndex + 1) % port.length
}
function reconnect() {
setTimeout(connect, closedDate ? closedDate + delay - performance.now() : 0)
}
function connected() {
try {
statements = {}
needsTypes = options.fetch_types
statementId = Math.random().toString(36).slice(2)
statementCount = 1
lifeTimer.start()
socket.on('data', data)
keep_alive && socket.setKeepAlive && socket.setKeepAlive(true, 1000 * keep_alive)
const s = StartupMessage()
write(s)
} catch (err) {
error(err)
}
}
function error(err) {
if (connection.queue === queues.connecting && options.host[retries + 1])
return
errored(err)
while (sent.length)
queryError(sent.shift(), err)
}
function errored(err) {
stream && (stream.destroy(err), stream = null)
query && queryError(query, err)
initial && (queryError(initial, err), initial = null)
}
function queryError(query, err) {
if (query.reserve)
return query.reject(err)
if (!err || typeof err !== 'object')
err = new Error(err)
'query' in err || 'parameters' in err || Object.defineProperties(err, {
stack: { value: err.stack + query.origin.replace(/.*\n/, '\n'), enumerable: options.debug },
query: { value: query.string, enumerable: options.debug },
parameters: { value: query.parameters, enumerable: options.debug },
args: { value: query.args, enumerable: options.debug },
types: { value: query.statement && query.statement.types, enumerable: options.debug }
})
query.reject(err)
}
function end() {
return ending || (
!connection.reserved && onend(connection),
!connection.reserved && !initial && !query && sent.length === 0
? (terminate(), new Promise(r => socket && socket.readyState !== 'closed' ? socket.once('close', r) : r()))
: ending = new Promise(r => ended = r)
)
}
function terminate() {
terminated = true
if (stream || query || initial || sent.length)
error(Errors.connection('CONNECTION_DESTROYED', options))
clearImmediate(nextWriteTimer)
if (socket) {
socket.removeListener('data', data)
socket.removeListener('connect', connected)
socket.readyState === 'open' && socket.end(b().X().end())
}
ended && (ended(), ending = ended = null)
}
async function closed(hadError) {
incoming = Buffer.alloc(0)
remaining = 0
incomings = null
clearImmediate(nextWriteTimer)
socket.removeListener('data', data)
socket.removeListener('connect', connected)
idleTimer.cancel()
lifeTimer.cancel()
connectTimer.cancel()
socket.removeAllListeners()
socket = null
if (initial)
return reconnect()
!hadError && (query || sent.length) && error(Errors.connection('CONNECTION_CLOSED', options, socket))
closedDate = performance.now()
hadError && options.shared.retries++
delay = (typeof backoff === 'function' ? backoff(options.shared.retries) : backoff) * 1000
onclose(connection, Errors.connection('CONNECTION_CLOSED', options, socket))
}
/* Handlers */
function handle(xs, x = xs[0]) {
(
x === 68 ? DataRow : // D
x === 100 ? CopyData : // d
x === 65 ? NotificationResponse : // A
x === 83 ? ParameterStatus : // S
x === 90 ? ReadyForQuery : // Z
x === 67 ? CommandComplete : // C
x === 50 ? BindComplete : // 2
x === 49 ? ParseComplete : // 1
x === 116 ? ParameterDescription : // t
x === 84 ? RowDescription : // T
x === 82 ? Authentication : // R
x === 110 ? NoData : // n
x === 75 ? BackendKeyData : // K
x === 69 ? ErrorResponse : // E
x === 115 ? PortalSuspended : // s
x === 51 ? CloseComplete : // 3
x === 71 ? CopyInResponse : // G
x === 78 ? NoticeResponse : // N
x === 72 ? CopyOutResponse : // H
x === 99 ? CopyDone : // c
x === 73 ? EmptyQueryResponse : // I
x === 86 ? FunctionCallResponse : // V
x === 118 ? NegotiateProtocolVersion : // v
x === 87 ? CopyBothResponse : // W
/* c8 ignore next */
UnknownMessage
)(xs)
}
function DataRow(x) {
let index = 7
let length
let column
let value
const row = query.isRaw ? new Array(query.statement.columns.length) : {}
for (let i = 0; i < query.statement.columns.length; i++) {
column = query.statement.columns[i]
length = x.readInt32BE(index)
index += 4
value = length === -1
? null
: query.isRaw === true
? x.subarray(index, index += length)
: column.parser === undefined
? x.toString('utf8', index, index += length)
: column.parser.array === true
? column.parser(x.toString('utf8', index + 1, index += length))
: column.parser(x.toString('utf8', index, index += length))
query.isRaw
? (row[i] = query.isRaw === true
? value
: transform.value.from ? transform.value.from(value, column) : value)
: (row[column.name] = transform.value.from ? transform.value.from(value, column) : value)
}
query.forEachFn
? query.forEachFn(transform.row.from ? transform.row.from(row) : row, result)
: (result[rows++] = transform.row.from ? transform.row.from(row) : row)
}
function ParameterStatus(x) {
const [k, v] = x.toString('utf8', 5, x.length - 1).split(b.N)
backendParameters[k] = v
if (options.parameters[k] !== v) {
options.parameters[k] = v
onparameter && onparameter(k, v)
}
}
function ReadyForQuery(x) {
query && query.options.simple && query.resolve(results || result)
query = results = null
result = new Result()
connectTimer.cancel()
if (initial) {
if (target_session_attrs) {
if (!backendParameters.in_hot_standby || !backendParameters.default_transaction_read_only)
return fetchState()
else if (tryNext(target_session_attrs, backendParameters))
return terminate()
}
if (needsTypes) {
initial.reserve && (initial = null)
return fetchArrayTypes()
}
initial && !initial.reserve && execute(initial)
options.shared.retries = retries = 0
initial = null
return
}
while (sent.length && (query = sent.shift()) && (query.active = true, query.cancelled))
Connection(options).cancel(query.state, query.cancelled.resolve, query.cancelled.reject)
if (query)
return // Consider opening if able and sent.length < 50
connection.reserved
? !connection.reserved.release && x[5] === 73 // I
? ending
? terminate()
: (connection.reserved = null, onopen(connection))
: connection.reserved()
: ending
? terminate()
: onopen(connection)
}
function CommandComplete(x) {
rows = 0
for (let i = x.length - 1; i > 0; i--) {
if (x[i] === 32 && x[i + 1] < 58 && result.count === null)
result.count = +x.toString('utf8', i + 1, x.length - 1)
if (x[i - 1] >= 65) {
result.command = x.toString('utf8', 5, i)
result.state = backend
break
}
}
final && (final(), final = null)
if (result.command === 'BEGIN' && max !== 1 && !connection.reserved)
return errored(Errors.generic('UNSAFE_TRANSACTION', 'Only use sql.begin, sql.reserved or max: 1'))
if (query.options.simple)
return BindComplete()
if (query.cursorFn) {
result.count && query.cursorFn(result)
write(Sync)
}
query.resolve(result)
}
function ParseComplete() {
query.parsing = false
}
function BindComplete() {
!result.statement && (result.statement = query.statement)
result.columns = query.statement.columns
}
function ParameterDescription(x) {
const length = x.readUInt16BE(5)
for (let i = 0; i < length; ++i)
!query.statement.types[i] && (query.statement.types[i] = x.readUInt32BE(7 + i * 4))
query.prepare && (statements[query.signature] = query.statement)
query.describeFirst && !query.onlyDescribe && (write(prepared(query)), query.describeFirst = false)
}
function RowDescription(x) {
if (result.command) {
results = results || [result]
results.push(result = new Result())
result.count = null
query.statement.columns = null
}
const length = x.readUInt16BE(5)
let index = 7
let start
query.statement.columns = Array(length)
for (let i = 0; i < length; ++i) {
start = index
while (x[index++] !== 0);
const table = x.readUInt32BE(index)
const number = x.readUInt16BE(index + 4)
const type = x.readUInt32BE(index + 6)
query.statement.columns[i] = {
name: transform.column.from
? transform.column.from(x.toString('utf8', start, index - 1))
: x.toString('utf8', start, index - 1),
parser: parsers[type],
table,
number,
type
}
index += 18
}
result.statement = query.statement
if (query.onlyDescribe)
return (query.resolve(query.statement), write(Sync))
}
async function Authentication(x, type = x.readUInt32BE(5)) {
(
type === 3 ? AuthenticationCleartextPassword :
type === 5 ? AuthenticationMD5Password :
type === 10 ? SASL :
type === 11 ? SASLContinue :
type === 12 ? SASLFinal :
type !== 0 ? UnknownAuth :
noop
)(x, type)
}
/* c8 ignore next 5 */
async function AuthenticationCleartextPassword() {
const payload = await Pass()
write(
b().p().str(payload).z(1).end()
)
}
async function AuthenticationMD5Password(x) {
const payload = 'md5' + (
await md5(
Buffer.concat([
Buffer.from(await md5((await Pass()) + user)),
x.subarray(9)
])
)
)
write(
b().p().str(payload).z(1).end()
)
}
async function SASL() {
nonce = (await crypto.randomBytes(18)).toString('base64')
b().p().str('SCRAM-SHA-256' + b.N)
const i = b.i
write(b.inc(4).str('n,,n=*,r=' + nonce).i32(b.i - i - 4, i).end())
}
async function SASLContinue(x) {
const res = x.toString('utf8', 9).split(',').reduce((acc, x) => (acc[x[0]] = x.slice(2), acc), {})
const saltedPassword = await crypto.pbkdf2Sync(
await Pass(),
Buffer.from(res.s, 'base64'),
parseInt(res.i), 32,
'sha256'
)
const clientKey = await hmac(saltedPassword, 'Client Key')
const auth = 'n=*,r=' + nonce + ','
+ 'r=' + res.r + ',s=' + res.s + ',i=' + res.i
+ ',c=biws,r=' + res.r
serverSignature = (await hmac(await hmac(saltedPassword, 'Server Key'), auth)).toString('base64')
const payload = 'c=biws,r=' + res.r + ',p=' + xor(
clientKey, Buffer.from(await hmac(await sha256(clientKey), auth))
).toString('base64')
write(
b().p().str(payload).end()
)
}
function SASLFinal(x) {
if (x.toString('utf8', 9).split(b.N, 1)[0].slice(2) === serverSignature)
return
/* c8 ignore next 5 */
errored(Errors.generic('SASL_SIGNATURE_MISMATCH', 'The server did not return the correct signature'))
socket.destroy()
}
function Pass() {
return Promise.resolve(typeof options.pass === 'function'
? options.pass()
: options.pass
)
}
function NoData() {
result.statement = query.statement
result.statement.columns = []
if (query.onlyDescribe)
return (query.resolve(query.statement), write(Sync))
}
function BackendKeyData(x) {
backend.pid = x.readUInt32BE(5)
backend.secret = x.readUInt32BE(9)
}
async function fetchArrayTypes() {
needsTypes = false
const types = await new Query([`
select b.oid, b.typarray
from pg_catalog.pg_type a
left join pg_catalog.pg_type b on b.oid = a.typelem
where a.typcategory = 'A'
group by b.oid, b.typarray
order by b.oid
`], [], execute)
types.forEach(({ oid, typarray }) => addArrayType(oid, typarray))
}
function addArrayType(oid, typarray) {
if (!!options.parsers[typarray] && !!options.serializers[typarray]) return
const parser = options.parsers[oid]
options.shared.typeArrayMap[oid] = typarray
options.parsers[typarray] = (xs) => arrayParser(xs, parser, typarray)
options.parsers[typarray].array = true
options.serializers[typarray] = (xs) => arraySerializer(xs, options.serializers[oid], options, typarray)
}
function tryNext(x, xs) {
return (
(x === 'read-write' && xs.default_transaction_read_only === 'on') ||
(x === 'read-only' && xs.default_transaction_read_only === 'off') ||
(x === 'primary' && xs.in_hot_standby === 'on') ||
(x === 'standby' && xs.in_hot_standby === 'off') ||
(x === 'prefer-standby' && xs.in_hot_standby === 'off' && options.host[retries])
)
}
function fetchState() {
const query = new Query([`
show transaction_read_only;
select pg_catalog.pg_is_in_recovery()
`], [], execute, null, { simple: true })
query.resolve = ([[a], [b]]) => {
backendParameters.default_transaction_read_only = a.transaction_read_only
backendParameters.in_hot_standby = b.pg_is_in_recovery ? 'on' : 'off'
}
query.execute()
}
function ErrorResponse(x) {
query && (query.cursorFn || query.describeFirst) && write(Sync)
const error = Errors.postgres(parseError(x))
query && query.retried
? errored(query.retried)
: query && query.prepared && retryRoutines.has(error.routine)
? retry(query, error)
: errored(error)
}
function retry(q, error) {
delete statements[q.signature]
q.retried = error
execute(q)
}
function NotificationResponse(x) {
if (!onnotify)
return
let index = 9
while (x[index++] !== 0);
onnotify(
x.toString('utf8', 9, index - 1),
x.toString('utf8', index, x.length - 1)
)
}
async function PortalSuspended() {
try {
const x = await Promise.resolve(query.cursorFn(result))
rows = 0
x === CLOSE
? write(Close(query.portal))
: (result = new Result(), write(Execute('', query.cursorRows)))
} catch (err) {
write(Sync)
query.reject(err)
}
}
function CloseComplete() {
result.count && query.cursorFn(result)
query.resolve(result)
}
function CopyInResponse() {
stream = new Stream.Writable({
autoDestroy: true,
write(chunk, encoding, callback) {
socket.write(b().d().raw(chunk).end(), callback)
},
destroy(error, callback) {
callback(error)
socket.write(b().f().str(error + b.N).end())
stream = null
},
final(callback) {
socket.write(b().c().end())
final = callback
}
})
query.resolve(stream)
}
function CopyOutResponse() {
stream = new Stream.Readable({
read() { socket.resume() }
})
query.resolve(stream)
}
/* c8 ignore next 3 */
function CopyBothResponse() {
stream = new Stream.Duplex({
autoDestroy: true,
read() { socket.resume() },
/* c8 ignore next 11 */
write(chunk, encoding, callback) {
socket.write(b().d().raw(chunk).end(), callback)
},
destroy(error, callback) {
callback(error)
socket.write(b().f().str(error + b.N).end())
stream = null
},
final(callback) {
socket.write(b().c().end())
final = callback
}
})
query.resolve(stream)
}
function CopyData(x) {
stream && (stream.push(x.subarray(5)) || socket.pause())
}
function CopyDone() {
stream && stream.push(null)
stream = null
}
function NoticeResponse(x) {
onnotice
? onnotice(parseError(x))
: console.log(parseError(x)) // eslint-disable-line
}
/* c8 ignore next 3 */
function EmptyQueryResponse() {
/* noop */
}
/* c8 ignore next 3 */
function FunctionCallResponse() {
errored(Errors.notSupported('FunctionCallResponse'))
}
/* c8 ignore next 3 */
function NegotiateProtocolVersion() {
errored(Errors.notSupported('NegotiateProtocolVersion'))
}
/* c8 ignore next 3 */
function UnknownMessage(x) {
console.error('Postgres.js : Unknown Message:', x[0]) // eslint-disable-line
}
/* c8 ignore next 3 */
function UnknownAuth(x, type) {
console.error('Postgres.js : Unknown Auth:', type) // eslint-disable-line
}
/* Messages */
function Bind(parameters, types, statement = '', portal = '') {
let prev
, type
b().B().str(portal + b.N).str(statement + b.N).i16(0).i16(parameters.length)
parameters.forEach((x, i) => {
if (x === null)
return b.i32(0xFFFFFFFF)
type = types[i]
parameters[i] = x = type in options.serializers
? options.serializers[type](x)
: '' + x
prev = b.i
b.inc(4).str(x).i32(b.i - prev - 4, prev)
})
b.i16(0)
return b.end()
}
function Parse(str, parameters, types, name = '') {
b().P().str(name + b.N).str(str + b.N).i16(parameters.length)
parameters.forEach((x, i) => b.i32(types[i] || 0))
return b.end()
}
function Describe(x, name = '') {
return b().D().str(x).str(name + b.N).end()
}
function Execute(portal = '', rows = 0) {
return Buffer.concat([
b().E().str(portal + b.N).i32(rows).end(),
Flush
])
}
function Close(portal = '') {
return Buffer.concat([
b().C().str('P').str(portal + b.N).end(),
b().S().end()
])
}
function StartupMessage() {
return cancelMessage || b().inc(4).i16(3).z(2).str(
Object.entries(Object.assign({
user,
database,
client_encoding: 'UTF8'
},
options.connection
)).filter(([, v]) => v).map(([k, v]) => k + b.N + v).join(b.N)
).z(2).end(0)
}
}
function parseError(x) {
const error = {}
let start = 5
for (let i = 5; i < x.length - 1; i++) {
if (x[i] === 0) {
error[errorFields[x[start]]] = x.toString('utf8', start + 1, i)
start = i + 1
}
}
return error
}
function md5(x) {
return crypto.createHash('md5').update(x).digest('hex')
}
function hmac(key, x) {
return crypto.createHmac('sha256', key).update(x).digest()
}
function sha256(x) {
return crypto.createHash('sha256').update(x).digest()
}
function xor(a, b) {
const length = Math.max(a.length, b.length)
const buffer = Buffer.allocUnsafe(length)
for (let i = 0; i < length; i++)
buffer[i] = a[i] ^ b[i]
return buffer
}
function timer(fn, seconds) {
seconds = typeof seconds === 'function' ? seconds() : seconds
if (!seconds)
return { cancel: noop, start: noop }
let timer
return {
cancel() {
timer && (clearTimeout(timer), timer = null)
},
start() {
timer && clearTimeout(timer)
timer = setTimeout(done, seconds * 1000, arguments)
}
}
function done(args) {
fn.apply(null, args)
timer = null
}
}