56 lines
1.4 KiB
JavaScript
56 lines
1.4 KiB
JavaScript
const lazy = require('./lazy')
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const typef = require('typeforce')
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const OPS = require('bitcoin-ops')
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const bscript = require('../script')
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const BITCOIN_NETWORK = require('../networks').bitcoin
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function stacksEqual (a, b) {
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if (a.length !== b.length) return false
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return a.every(function (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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function p2data (a, opts) {
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if (
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!a.data &&
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!a.output
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) throw new TypeError('Not enough data')
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opts = opts || { validate: true }
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typef({
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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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}, a)
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const network = a.network || BITCOIN_NETWORK
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const o = { network }
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lazy.prop(o, 'output', function () {
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if (!a.data) return
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return bscript.compile([OPS.OP_RETURN].concat(a.data))
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})
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lazy.prop(o, 'data', function () {
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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) throw new TypeError('Output is invalid')
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if (!chunks.slice(1).every(typef.Buffer)) throw new TypeError('Output is invalid')
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if (a.data && !stacksEqual(a.data, o.data)) 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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module.exports = p2data
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