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import { TransactionBuilder, ECPair } from 'bitcoinjs-lib'
import { hexStringToECPair, ecPairToAddress } from '../utils'
/**
* @ignore
*/
export interface TransactionSigner {
/**
* @returns version number of the signer, currently, should always be 1
* @private
* @ignore
*/
signerVersion(): number;
/**
* @returns a string representing the transaction signer's address
* (usually Base58 check encoding)
* @private
* @ignore
*/
getAddress(): Promise<string>;
/**
* Signs a transaction input
* @param {TransactionBuilder} transaction - the transaction to sign
* @param {number} inputIndex - the input on the transaction to sign
* @private
* @ignore
*/
signTransaction(transaction: TransactionBuilder, inputIndex: number): Promise<void>;
}
/**
* Class representing a transaction signer for pubkeyhash addresses
* (a.k.a. single-sig addresses)
* @private
* @ignore
*/
export class PubkeyHashSigner implements TransactionSigner {
ecPair: ECPair.ECPairInterface
constructor(ecPair: ECPair.ECPairInterface) {
this.ecPair = ecPair
}
static fromHexString(keyHex: string) {
return new PubkeyHashSigner(hexStringToECPair(keyHex))
}
signerVersion(): number {
return 1
}
getAddress(): Promise<string> {
return Promise.resolve()
.then(() => ecPairToAddress(this.ecPair))
}
signTransaction(transaction: TransactionBuilder, inputIndex: number): Promise<void> {
return Promise.resolve()
.then(() => {
transaction.sign(inputIndex, this.ecPair)
})
}
}
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