@neo-one/node-core/crypto/MerkleTree.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const client_common_1 = require("@neo-one/client-common");
const utils_1 = require("@neo-one/utils");
exports.InvalidMerkleTreeException = utils_1.makeErrorWithCode('INVALID_MERKLE_TREE', () => 'Invalid Merkle tree. (no nodes found)');
class MerkleTreeNode {
    constructor({ hash, leftChild, rightChild, parent, }) {
        this.hash = hash;
        this.leftChild = leftChild;
        this.rightChild = rightChild;
        this.parent = parent;
    }
    clone(parent) {
        const self = new MerkleTreeNode({
            hash: this.hash,
            parent,
        });
        if (this.leftChild !== undefined) {
            self.leftChild = this.leftChild.clone(self);
        }
        if (this.rightChild !== undefined) {
            self.rightChild = this.rightChild.clone(self);
        }
        return self;
    }
}
const build = (leavesIn) => {
    const leaves = leavesIn;
    if (leaves.length === 0) {
        throw new exports.InvalidMerkleTreeException();
    }
    if (leaves.length === 1) {
        return leaves[0];
    }
    const parents = [];
    const length = Math.floor((leaves.length + 1) / 2);
    for (let i = 0; i < length; i += 1) {
        const leftChild = leaves[i * 2];
        const rightChild = i * 2 + 1 === leaves.length ? leftChild : leaves[i * 2 + 1];
        const node = new MerkleTreeNode({
            hash: client_common_1.crypto.hash256(Buffer.concat([client_common_1.common.uInt256ToBuffer(leftChild.hash), client_common_1.common.uInt256ToBuffer(rightChild.hash)])),
            leftChild,
            rightChild,
        });
        parents[i] = node;
        leaves[i * 2].parent = node;
        if (i * 2 + 1 !== leaves.length) {
            leaves[i * 2 + 1].parent = node;
        }
    }
    return build(parents);
};
const trim = (node, index, depth, flags) => {
    const { leftChild, rightChild } = node;
    if (depth === 1 || leftChild === undefined) {
        return;
    }
    if (depth === 2) {
        if (!flags[index * 2] && !flags[index * 2 + 1]) {
            node.leftChild = undefined;
            node.rightChild = undefined;
        }
    }
    else if (rightChild !== undefined) {
        trim(leftChild, index * 2, depth - 1, flags);
        trim(rightChild, index * 2 + 1, depth - 1, flags);
        if (leftChild.leftChild === undefined && rightChild.rightChild === undefined) {
            node.leftChild = undefined;
            node.rightChild = undefined;
        }
    }
};
const depthFirstSearchWorker = (node, mutableHashes) => {
    const { leftChild, rightChild } = node;
    if (leftChild === undefined || rightChild === undefined) {
        mutableHashes.push(node.hash);
    }
    else {
        depthFirstSearchWorker(leftChild, mutableHashes);
        depthFirstSearchWorker(rightChild, mutableHashes);
    }
};
const depthFirstSearch = (node) => {
    const mutableHashes = [];
    depthFirstSearchWorker(node, mutableHashes);
    return mutableHashes;
};
class MerkleTree {
    static computeRoot(hashes) {
        const tree = new this(hashes);
        return tree.root.hash;
    }
    constructor(hashesOrNode) {
        this.root = Array.isArray(hashesOrNode)
            ? build(hashesOrNode.map((hash) => new MerkleTreeNode({ hash })))
            : hashesOrNode;
        this.depth = 1;
        for (let node = this.root; node.leftChild !== undefined; node = node.leftChild) {
            this.depth += 1;
        }
    }
    trim(flags) {
        const result = this.root.clone();
        trim(result, 0, this.depth, flags);
        return new MerkleTree(result);
    }
    depthFirstSearch() {
        return depthFirstSearch(this.root);
    }
    toHashArray() {
        return this.depthFirstSearch();
    }
}
exports.MerkleTree = MerkleTree;

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(no nodes found)',\n);\n\nclass MerkleTreeNode {\n  public readonly hash: UInt256;\n  public leftChild: MerkleTreeNode | undefined;\n  public rightChild: MerkleTreeNode | undefined;\n  public parent: MerkleTreeNode | undefined;\n\n  public constructor({\n    hash,\n    leftChild,\n    rightChild,\n    parent,\n  }: {\n    readonly hash: UInt256;\n    readonly leftChild?: MerkleTreeNode;\n    readonly rightChild?: MerkleTreeNode;\n    readonly parent?: MerkleTreeNode;\n  }) {\n    this.hash = hash;\n    this.leftChild = leftChild;\n    this.rightChild = rightChild;\n    this.parent = parent;\n  }\n\n  public clone(parent?: MerkleTreeNode): MerkleTreeNode {\n    const self = new MerkleTreeNode({\n      hash: this.hash,\n      parent,\n    });\n\n    if (this.leftChild !== undefined) {\n      self.leftChild = this.leftChild.clone(self);\n    }\n    if (this.rightChild !== undefined) {\n      self.rightChild = this.rightChild.clone(self);\n    }\n\n    return self;\n  }\n}\n\nconst build = (leavesIn: readonly MerkleTreeNode[]): MerkleTreeNode => {\n  const leaves = leavesIn;\n  if (leaves.length === 0) {\n    throw new InvalidMerkleTreeException();\n  }\n  if (leaves.length === 1) {\n    return leaves[0];\n  }\n\n  const parents = [];\n  const length = Math.floor((leaves.length + 1) / 2);\n  // tslint:disable-next-line no-loop-statement\n  for (let i = 0; i < length; i += 1) {\n    const leftChild = leaves[i * 2];\n\n    const rightChild = i * 2 + 1 === leaves.length ? leftChild : leaves[i * 2 + 1];\n    const node = new MerkleTreeNode({\n      hash: crypto.hash256(\n        Buffer.concat([common.uInt256ToBuffer(leftChild.hash), common.uInt256ToBuffer(rightChild.hash)]),\n      ),\n      leftChild,\n      rightChild,\n    });\n\n    parents[i] = node;\n    leaves[i * 2].parent = node;\n\n    if (i * 2 + 1 !== leaves.length) {\n      leaves[i * 2 + 1].parent = node;\n    }\n  }\n\n  return build(parents);\n};\n\nconst trim = (node: MerkleTreeNode, index: number, depth: number, flags: readonly boolean[]) => {\n  const { leftChild, rightChild } = node;\n  if (depth === 1 || leftChild === undefined) {\n    return;\n  }\n\n  if (depth === 2) {\n    if (!flags[index * 2] && !flags[index * 2 + 1]) {\n      node.leftChild = undefined;\n      node.rightChild = undefined;\n    }\n  } else if (rightChild !== undefined) {\n    trim(leftChild, index * 2, depth - 1, flags);\n    trim(rightChild, index * 2 + 1, depth - 1, flags);\n    if (leftChild.leftChild === undefined && rightChild.rightChild === undefined) {\n      node.leftChild = undefined;\n      node.rightChild = undefined;\n    }\n  }\n};\n\nconst depthFirstSearchWorker = (node: MerkleTreeNode, mutableHashes: UInt256[]): void => {\n  const { leftChild, rightChild } = node;\n  if (leftChild === undefined || rightChild === undefined) {\n    mutableHashes.push(node.hash);\n  } else {\n    depthFirstSearchWorker(leftChild, mutableHashes);\n    depthFirstSearchWorker(rightChild, mutableHashes);\n  }\n};\n\nconst depthFirstSearch = (node: MerkleTreeNode): readonly UInt256[] => {\n  const mutableHashes: UInt256[] = [];\n  depthFirstSearchWorker(node, mutableHashes);\n\n  return mutableHashes;\n};\n\nexport class MerkleTree {\n  public static computeRoot(hashes: readonly UInt256[]): UInt256 {\n    const tree = new this(hashes);\n\n    return tree.root.hash;\n  }\n\n  public readonly root: MerkleTreeNode;\n  public readonly depth: number;\n\n  public constructor(hashesOrNode: readonly UInt256[] | MerkleTreeNode) {\n    this.root = Array.isArray(hashesOrNode)\n      ? build(hashesOrNode.map((hash) => new MerkleTreeNode({ hash })))\n      : (hashesOrNode as MerkleTreeNode);\n    this.depth = 1;\n    // tslint:disable-next-line no-loop-statement no-let\n    for (let node = this.root; node.leftChild !== undefined; node = node.leftChild) {\n      this.depth += 1;\n    }\n  }\n\n  public trim(flags: readonly boolean[]): MerkleTree {\n    const result = this.root.clone();\n    trim(result, 0, this.depth, flags);\n\n    return new MerkleTree(result);\n  }\n\n  public depthFirstSearch(): readonly UInt256[] {\n    return depthFirstSearch(this.root);\n  }\n\n  public toHashArray(): readonly UInt256[] {\n    return this.depthFirstSearch();\n  }\n}\n"]}