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transaction.parser.ts
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transaction.parser.ts
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import { keccak_256 } from '@noble/hashes/sha3'
import { transaction } from '../../proto'
import { equal } from '@desig/core'
export enum TransactionType {
tExtension = 'tExtension',
tReduction = 'tReduction',
nExtension = 'nExtension',
nReduction = 'nReduction',
}
export class TransactionParser {
constructor() {}
static selectors: Record<TransactionType, Uint8Array> = {
tExtension: keccak_256(TransactionType.tExtension).subarray(0, 8),
tReduction: keccak_256(TransactionType.tReduction).subarray(0, 8),
nExtension: keccak_256(TransactionType.nExtension).subarray(0, 8),
nReduction: keccak_256(TransactionType.nReduction).subarray(0, 8),
}
static parseType = (selector: Uint8Array) => {
if (equal([selector, this.selectors.nExtension]))
return TransactionType.nExtension
if (equal([selector, this.selectors.nReduction]))
return TransactionType.nReduction
if (equal([selector, this.selectors.tExtension]))
return TransactionType.tExtension
if (equal([selector, this.selectors.tReduction]))
return TransactionType.tReduction
throw new Error('Unsupported Desig transaction.')
}
verify = async (buf: Uint8Array, gid?: Uint8Array) => {
const { selector, refgid, t, n } = transaction.BaseTransaction.decode(buf)
if (!!gid && !equal([gid, refgid])) throw new Error('Stale transaction.')
return {
txType: TransactionParser.parseType(selector),
refgid,
t: Number(t),
n: Number(n),
}
}
nExtension = {
encode: (data: Omit<transaction.InExtension, 'selector'>) => {
const payload = {
selector: TransactionParser.selectors[TransactionType.nExtension],
...data,
}
const er = transaction.nExtension.verify(payload)
if (er) throw new Error(er)
const msg = transaction.nExtension.create(payload)
return transaction.nExtension.encode(msg).finish()
},
decode: (buf: Uint8Array) => {
const { selector, ...data } = transaction.nExtension.decode(buf)
if (TransactionParser.parseType(selector) !== TransactionType.nExtension)
throw new Error('Invalid type')
return data
},
}
nReduction = {
encode: (data: Omit<transaction.InReduction, 'selector'>) => {
const payload = {
selector: TransactionParser.selectors[TransactionType.nReduction],
...data,
}
const er = transaction.nReduction.verify(payload)
if (er) throw new Error(er)
const msg = transaction.nReduction.create(payload)
return transaction.nReduction.encode(msg).finish()
},
decode: (buf: Uint8Array) => {
const { selector, ...data } = transaction.nReduction.decode(buf)
if (TransactionParser.parseType(selector) !== TransactionType.nReduction)
throw new Error('Invalid type')
return data
},
}
tExtension = {
encode: (data: Omit<transaction.ItExtension, 'selector'>) => {
const payload = {
selector: TransactionParser.selectors[TransactionType.tExtension],
...data,
}
const er = transaction.tExtension.verify(payload)
if (er) throw new Error(er)
const msg = transaction.tExtension.create(payload)
return transaction.tExtension.encode(msg).finish()
},
decode: (buf: Uint8Array) => {
const { selector, ...data } = transaction.tExtension.decode(buf)
if (TransactionParser.parseType(selector) !== TransactionType.tExtension)
throw new Error('Invalid type')
return data
},
}
tReduction = {
encode: (data: Omit<transaction.ItReduction, 'selector'>) => {
const payload = {
selector: TransactionParser.selectors[TransactionType.tReduction],
...data,
}
const er = transaction.tReduction.verify(payload)
if (er) throw new Error(er)
const msg = transaction.tReduction.create(payload)
return transaction.tReduction.encode(msg).finish()
},
decode: (buf: Uint8Array) => {
const { selector, ...data } = transaction.tReduction.decode(buf)
if (TransactionParser.parseType(selector) !== TransactionType.tReduction)
throw new Error('Invalid type')
return data
},
}
}
export class TZkProofParser {
constructor() {}
encode = (data: transaction.IZKProof) => {
const er = transaction.ZKProof.verify(data)
if (er) throw new Error(er)
const msg = transaction.ZKProof.create(data)
return transaction.ZKProof.encode(msg).finish()
}
decode = (buf: Uint8Array) => {
const data = transaction.ZKProof.decode(buf)
return data
}
}