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address.js
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address.js
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/**
* Bitcoin Address
* ===============
*
* A bitcoin address. Normal use cases:
* const address = new Address().fromPubKey(pubKey)
* const address = new Address().fromString(string)
* const string = address.toString()
* const script = address.toTxOutScript()
* const isValid = Address.isValid(string)
*
* Can also do testnet:
* const address = Address.Testnet()
*
* Note that an Address and an Addr are two completely different things. An
* Address is what you send bitcoin to. An Addr is an ip address and port that
* you connect to over the internet.
*/
'use strict'
import { Base58Check } from './base-58-check'
import { Constants } from './constants'
import { Hash } from './hash'
import { OpCode } from './op-code'
import { PubKey } from './pub-key'
import { PrivKey } from './priv-key'
import { Script } from './script'
import { Struct } from './struct'
import { Workers } from './workers'
class Address extends Struct {
constructor (versionByteNum, hashBuf, constants = null) {
super({ versionByteNum, hashBuf })
constants = constants || Constants.Default.Address
this.Constants = constants
}
fromBuffer (buf) {
if (buf.length !== 1 + 20) {
throw new Error('address buffers must be exactly 21 bytes')
}
if (
buf[0] !== this.Constants.pubKeyHash
) {
throw new Error('address: invalid versionByteNum byte')
}
this.versionByteNum = buf[0]
this.hashBuf = buf.slice(1)
return this
}
fromPubKeyHashBuf (hashBuf) {
this.hashBuf = hashBuf
this.versionByteNum = this.Constants.pubKeyHash
return this
}
static fromPubKeyHashBuf (hashBuf) {
return new this().fromPubKeyHashBuf(hashBuf)
}
fromPubKey (pubKey) {
const hashBuf = Hash.sha256Ripemd160(pubKey.toBuffer())
return this.fromPubKeyHashBuf(hashBuf)
}
static fromPubKey (pubKey) {
return new this().fromPubKey(pubKey)
}
async asyncFromPubKey (pubKey) {
const args = [pubKey]
const workersResult = await Workers.asyncObjectMethod(
this,
'fromPubKey',
args
)
return this.fromFastBuffer(workersResult.resbuf)
}
static asyncFromPubKey (pubKey) {
return new this().asyncFromPubKey(pubKey)
}
fromPrivKey (privKey) {
const pubKey = new PubKey().fromPrivKey(privKey)
const hashBuf = Hash.sha256Ripemd160(pubKey.toBuffer())
return this.fromPubKeyHashBuf(hashBuf)
}
static fromPrivKey (privKey) {
return new this().fromPrivKey(privKey)
}
async asyncFromPrivKey (privKey) {
const args = [privKey]
const workersResult = await Workers.asyncObjectMethod(
this,
'fromPrivKey',
args
)
return this.fromFastBuffer(workersResult.resbuf)
}
static asyncFromPrivKey (privKey) {
return new this().fromPrivKey(privKey)
}
fromRandom () {
const randomPrivKey = new PrivKey().fromRandom()
return this.fromPrivKey(randomPrivKey)
}
static fromRandom () {
return new this().fromRandom()
}
async asyncFromRandom () {
const args = []
const workersResult = await Workers.asyncObjectMethod(
this,
'fromRandom',
args
)
return this.fromFastBuffer(workersResult.resbuf)
}
static asyncFromRandom () {
return new this().fromRandom()
}
fromString (str) {
const buf = Base58Check.decode(str)
return this.fromBuffer(buf)
}
async asyncFromString (str) {
const args = [str]
const workersResult = await Workers.asyncObjectMethod(
this,
'fromString',
args
)
return this.fromFastBuffer(workersResult.resbuf)
}
static asyncFromString (str) {
return new this().asyncFromString(str)
}
static isValid (addrstr) {
let address
try {
address = new Address().fromString(addrstr)
} catch (e) {
return false
}
return address.isValid()
}
isValid () {
try {
this.validate()
return true
} catch (e) {
return false
}
}
toTxOutScript () {
const script = new Script()
script.writeOpCode(OpCode.OP_DUP)
script.writeOpCode(OpCode.OP_HASH160)
script.writeBuffer(this.hashBuf)
script.writeOpCode(OpCode.OP_EQUALVERIFY)
script.writeOpCode(OpCode.OP_CHECKSIG)
return script
}
fromTxInScript (script) {
const pubKeyHashBuf = Hash.sha256Ripemd160(script.chunks[1].buf || Buffer.from('00'.repeat(32), 'hex'))
return this.fromPubKeyHashBuf(pubKeyHashBuf)
}
static fromTxInScript (script) {
return new this().fromTxInScript(script)
}
fromTxOutScript (script) {
return this.fromPubKeyHashBuf(script.chunks[2].buf)
}
static fromTxOutScript (script) {
return new this().fromTxOutScript(script)
}
toBuffer () {
const versionByteBuf = Buffer.from([this.versionByteNum])
const buf = Buffer.concat([versionByteBuf, this.hashBuf])
return buf
}
toJSON () {
const json = {}
if (this.hashBuf) {
json.hashBuf = this.hashBuf.toString('hex')
}
if (typeof this.versionByteNum !== 'undefined') {
json.versionByteNum = this.versionByteNum
}
return json
}
fromJSON (json) {
if (json.hashBuf) {
this.hashBuf = Buffer.from(json.hashBuf, 'hex')
}
if (typeof json.versionByteNum !== 'undefined') {
this.versionByteNum = json.versionByteNum
}
return this
}
toString () {
return Base58Check.encode(this.toBuffer())
}
async asyncToString () {
const args = []
const workersResult = await Workers.asyncObjectMethod(
this,
'toString',
args
)
return JSON.parse(workersResult.resbuf.toString())
}
validate () {
if (!Buffer.isBuffer(this.hashBuf) || this.hashBuf.length !== 20) {
throw new Error('hashBuf must be a buffer of 20 bytes')
}
if (
this.versionByteNum !== this.Constants.pubKeyHash
) {
throw new Error('invalid versionByteNum')
}
return this
}
}
Address.Mainnet = class extends Address {
constructor (versionByteNum, hashBuf) {
super(versionByteNum, hashBuf, Constants.Mainnet.Address)
}
}
Address.Testnet = class extends Address {
constructor (versionByteNum, hashBuf) {
super(versionByteNum, hashBuf, Constants.Testnet.Address)
}
}
export { Address }