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| import { createHash } from "crypto"; | |
| function makeTree(arr) { | |
| if (arr.length === 0) return null; | |
| if (arr.length === 1) return arr[0]; | |
| const list = []; | |
| const length = arr.length; | |
| for (let i = 0; i < length; i += 2) { | |
| const currentItem = arr[i]; | |
| if (i + 1 >= length) { | |
| list.push(currentItem); | |
| break; | |
| } | |
| const nextItem = arr[i + 1]; | |
| let value = currentItem.value + nextItem.value; | |
| const node = new MerkleNode(getHash(value), currentItem, nextItem); | |
| list.push(node); | |
| } | |
| return makeTree(list); | |
| } | |
| function getHash(data) { | |
| return createHash("sha256").update(data.toString()).digest("hex"); | |
| } | |
| class MerkleNode { | |
| constructor(value, left = null, right = null) { | |
| this.value = value; | |
| this.left = left; | |
| this.right = right; | |
| } | |
| } | |
| class MerkleTree { | |
| constructor(root, size) { | |
| this.root = root; | |
| this.size = size; | |
| } | |
| static create(transactions) { | |
| const size = Math.ceil(Math.log2(transactions.length)) + 1; | |
| const root = makeTree(transactions.map((trn) => new MerkleNode(trn.hash))); | |
| return new MerkleTree(root, size); | |
| } | |
| } |
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