45 lines
1.7 KiB
JavaScript
45 lines
1.7 KiB
JavaScript
// Copyright BigchainDB GmbH and BigchainDB contributors
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// SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
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// Code is Apache-2.0 and docs are CC-BY-4.0
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import { Buffer } from 'buffer'
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import base58 from 'bs58'
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import cc from 'crypto-conditions'
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/**
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* Loads a crypto-condition class (Fulfillment or Condition) from a BigchainDB JSON object
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* @param {Object} conditionJson
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* @returns {cc.Condition} Ed25519 Condition (that will need to wrapped in an Output)
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*/
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export default function ccJsonLoad(conditionJson) {
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if ('hash' in conditionJson) {
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const condition = new cc.Condition()
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condition.type = conditionJson.type_id
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condition.bitmask = conditionJson.bitmask
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condition.hash = Buffer.from(base58.decode(conditionJson.hash))
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condition.maxFulfillmentLength = parseInt(conditionJson.max_fulfillment_length, 10)
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return condition
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} else {
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let fulfillment
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if (conditionJson.type === 'threshold-sha-256') {
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fulfillment = new cc.ThresholdSha256()
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fulfillment.threshold = conditionJson.threshold
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conditionJson.subconditions.forEach((subconditionJson) => {
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const subcondition = ccJsonLoad(subconditionJson)
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if ('getConditionUri' in subcondition) {
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fulfillment.addSubfulfillment(subcondition)
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} else if ('serializeUri' in subcondition) {
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fulfillment.addSubcondition(subcondition)
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}
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})
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}
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if (conditionJson.type === 'ed25519-sha-256') {
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fulfillment = new cc.Ed25519Sha256()
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fulfillment.publicKey = Buffer.from(base58.decode(conditionJson.public_key))
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}
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return fulfillment
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}
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}
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