46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
const { toBN, BN } = require('web3-utils')
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const { randomBN, pedersenHashBuffer, poseidonHash } = require('./utils')
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class Note {
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constructor({ secret, nullifier, netId, amount, currency, depositBlock, withdrawalBlock, instance } = {}) {
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this.secret = secret ? toBN(secret) : randomBN(31)
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this.nullifier = nullifier ? toBN(nullifier) : randomBN(31)
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this.commitment = pedersenHashBuffer(
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Buffer.concat([this.nullifier.toBuffer('le', 31), this.secret.toBuffer('le', 31)]),
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)
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this.nullifierHash = pedersenHashBuffer(this.nullifier.toBuffer('le', 31))
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this.rewardNullifier = poseidonHash([this.nullifier])
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this.netId = netId
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this.amount = amount
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this.currency = currency
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this.depositBlock = toBN(depositBlock)
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this.withdrawalBlock = toBN(withdrawalBlock)
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this.instance = instance || Note.getInstance(currency, amount)
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}
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static getInstance(/* currency, amount */) {
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// todo
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}
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static fromString(note, instance, depositBlock, withdrawalBlock) {
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const [, currency, amount, netId, noteHex] = note.split('-')
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const noteBuff = Buffer.from(noteHex.slice(2), 'hex')
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const nullifier = new BN(noteBuff.slice(0, 31), 16, 'le')
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const secret = new BN(noteBuff.slice(31), 16, 'le')
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return new Note({
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secret,
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nullifier,
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netId,
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amount,
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currency,
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depositBlock,
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withdrawalBlock,
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instance,
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})
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}
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}
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module.exports = Note
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