58 lines
1.6 KiB
TypeScript
58 lines
1.6 KiB
TypeScript
import { bitcoin as BITCOIN_NETWORK } from '../networks';
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import * as bscript from '../script';
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import { typeforce as typef } from '../types';
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import { Payment, PaymentOpts, Stack } from './index';
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import * as lazy from './lazy';
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const OPS = bscript.OPS;
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function stacksEqual(a: Buffer[], b: Buffer[]): boolean {
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if (a.length !== b.length) return false;
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return a.every((x, i) => {
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return x.equals(b[i]);
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});
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}
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// output: OP_RETURN ...
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export function p2data(a: Payment, opts?: PaymentOpts): Payment {
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if (!a.data && !a.output) throw new TypeError('Not enough data');
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opts = Object.assign({ validate: true }, opts || {});
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typef(
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{
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network: typef.maybe(typef.Object),
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output: typef.maybe(typef.Buffer),
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data: typef.maybe(typef.arrayOf(typef.Buffer)),
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},
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a,
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);
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const network = a.network || BITCOIN_NETWORK;
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const o = { name: 'embed', network } as Payment;
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lazy.prop(o, 'output', () => {
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if (!a.data) return;
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return bscript.compile(([OPS.OP_RETURN] as Stack).concat(a.data));
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});
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lazy.prop(o, 'data', () => {
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if (!a.output) return;
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return bscript.decompile(a.output)!.slice(1);
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});
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// extended validation
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if (opts.validate) {
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if (a.output) {
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const chunks = bscript.decompile(a.output);
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if (chunks![0] !== OPS.OP_RETURN)
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throw new TypeError('Output is invalid');
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if (!chunks!.slice(1).every(typef.Buffer))
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throw new TypeError('Output is invalid');
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if (a.data && !stacksEqual(a.data, o.data as Buffer[]))
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throw new TypeError('Data mismatch');
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}
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}
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return Object.assign(o, a);
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}
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