94 lines
2.8 KiB
TypeScript
94 lines
2.8 KiB
TypeScript
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import * as crypto from 'crypto';
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import { logger } from '../utils/logger';
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export interface BlockchainBlock {
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index: number;
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timestamp: Date;
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data: any;
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previousHash: string;
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hash: string;
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}
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/**
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* [BIZ_TRADE_11] 基于区块链的供应链溯源集成 (Blockchain Traceability)
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* @description 实现全链路关键节点的不可篡改存证，支持商品从工厂、口岸到终端用户的全流程可信溯源
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*/
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export class BlockchainTraceabilityService {
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private static chain: BlockchainBlock[] = [];
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/**
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* 初始化区块链
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*/
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static async init() {
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if (this.chain.length === 0) {
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const genesisBlock = this.createBlock(0, '0', { message: 'Genesis Block' });
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this.chain.push(genesisBlock);
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}
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}
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/**
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* 记录溯源存证 (Evidence)
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* @param eventType 事件类型 (e.g., 'MANUFACTURE', 'CUSTOMS_CLEARANCE', 'DELIVERY')
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* @param details 详细数据
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*/
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static async recordEvidence(eventType: string, details: any): Promise<string> {
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logger.info(`[Blockchain] Recording evidence for event: ${eventType}`);
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const previousBlock = this.chain[this.chain.length - 1];
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const newBlock = this.createBlock(
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this.chain.length,
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previousBlock.hash,
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{ eventType, details, timestamp: new Date().toISOString() }
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);
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this.chain.push(newBlock);
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logger.info(`[Blockchain] Evidence recorded. Block Hash: ${newBlock.hash}`);
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return newBlock.hash;
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}
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/**
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* 验证全链完整性
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*/
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static async verifyChain(): Promise<boolean> {
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for (let i = 1; i < this.chain.length; i++) {
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const current = this.chain[i];
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const previous = this.chain[i - 1];
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// 1. 校验当前哈希
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const recalculatedHash = this.calculateHash(current.index, current.previousHash, current.timestamp, current.data);
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if (current.hash !== recalculatedHash) return false;
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// 2. 校验哈希链
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if (current.previousHash !== previous.hash) return false;
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}
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return true;
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}
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/**
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* 构造区块
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*/
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private static createBlock(index: number, previousHash: string, data: any): BlockchainBlock {
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const timestamp = new Date();
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const hash = this.calculateHash(index, previousHash, timestamp, data);
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return { index, timestamp, data, previousHash, hash };
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}
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/**
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* 计算哈希 (SHA-256)
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*/
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private static calculateHash(index: number, previousHash: string, timestamp: Date, data: any): string {
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const str = `${index}${previousHash}${timestamp.toISOString()}${JSON.stringify(data)}`;
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return crypto.createHash('sha256').update(str).digest('hex');
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}
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/**
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* 查询溯源历史
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*/
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static async getHistory(productId: string): Promise<any[]> {
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return this.chain
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.filter(block => block.data?.details?.productId === productId)
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.map(block => block.data);
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}
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}
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