tax-invoice/dist/utils.js

发票SDK - 提供完整的发票API接口

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Utils = void 0;
const crypto_1 = __importDefault(require("crypto"));
/**
 * 工具类 - 提供签名、随机字符串等通用功能
 */
class Utils {
    /**
     * 生成随机字符串
     * @param length 字符串长度，默认20
     * @returns 随机字符串
     */
    static generateRandomString(length = 20) {
        const characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        let randomString = '';
        for (let i = 0; i < length; i++) {
            randomString += characters.charAt(Math.floor(Math.random() * characters.length));
        }
        return randomString;
    }
    /**
     * 获取当前时间戳（秒）
     * @returns 时间戳字符串
     */
    static getTimestamp() {
        return Math.floor(Date.now() / 1000).toString();
    }
    /**
     * 计算签名
     * @param method HTTP方法
     * @param path 请求路径
     * @param randomString 随机字符串
     * @param timestamp 时间戳
     * @param appKey 应用密钥
     * @param appSecret 应用密钥
     * @returns 签名
     */
    static calculateSignature(method, path, randomString, timestamp, appKey, appSecret) {
        // 构建签名字符串
        const signContent = `Method=${method}&Path=${path}&RandomString=${randomString}&TimeStamp=${timestamp}&AppKey=${appKey}`;
        // 使用HMAC-SHA256计算签名
        const hmac = crypto_1.default.createHmac('sha256', appSecret);
        hmac.update(signContent);
        const signature = hmac.digest('hex');
        // 转为大写
        return signature.toUpperCase();
    }
    /**
     * 格式化金额，保留2位小数
     * @param amount 金额
     * @returns 格式化后的金额字符串
     */
    static formatAmount(amount) {
        return amount.toFixed(2);
    }
    /**
     * 计算税额
     * @param amount 金额
     * @param taxRate 税率
     * @param isIncludeTax 是否含税，默认为false
     * @returns 税额字符串
     */
    static calculateTax(amount, taxRate, isIncludeTax = false) {
        const amountNum = parseFloat(amount);
        const taxRateNum = parseFloat(taxRate);
        let tax;
        if (isIncludeTax) {
            // 含税计算：税额 = 金额 / (1 + 税率) * 税率
            tax = amountNum / (1 + taxRateNum) * taxRateNum;
        }
        else {
            // 不含税计算：税额 = 金额 * 税率
            tax = amountNum * taxRateNum;
        }
        return Utils.formatAmount(tax);
    }
    /**
     * 计算不含税金额
     * @param amount 含税金额
     * @param taxRate 税率
     * @returns 不含税金额字符串
     */
    static calculateAmountWithoutTax(amount, taxRate) {
        const amountNum = parseFloat(amount);
        const taxRateNum = parseFloat(taxRate);
        // 不含税金额 = 含税金额 / (1 + 税率)
        const amountWithoutTax = amountNum / (1 + taxRateNum);
        return Utils.formatAmount(amountWithoutTax);
    }
    /**
     * 计算含税金额
     * @param amount 不含税金额
     * @param taxRate 税率
     * @returns 含税金额字符串
     */
    static calculateAmountWithTax(amount, taxRate) {
        const amountNum = parseFloat(amount);
        const taxRateNum = parseFloat(taxRate);
        // 含税金额 = 不含税金额 * (1 + 税率)
        const amountWithTax = amountNum * (1 + taxRateNum);
        return Utils.formatAmount(amountWithTax);
    }
}
exports.Utils = Utils;