@yeepay/yop-nodejs-sdk/dist/Util/CashierSupport.js

YOP NodeJS SDK with TypeScript support

import crypto from 'crypto';
import { HttpUtils } from './HttpUtils.js';
export class CashierSupport {
    /**
     * Gets payment URL for cashier
     * @param privateKey - Private key for signing
     * @param appKey - Application key
     * @param merchantNo - Merchant number
     * @param token - Token from order creation
     * @returns Payment URL
     */
    static getPayUrl(privateKey, appKey, merchantNo, token) {
        const params = {
            appKey,
            merchantNo, // System merchant number
            token, // Token from order creation API
            timestamp: '', // Timestamp
            directPayType: '', // Direct payment type
            cardType: '', // Card type (only for bank card quick payment)
            userNo: '', // User identifier for bank card quick payment (for card binding)
            userType: 'USER_ID' // User identifier type
        };
        const str = this.getCanonicalParams(params);
        const sign = this.signature(privateKey, str);
        return this.CASHIER_URL + "?sign=" + sign + "&" + str;
    }
    /**
     * Gets canonical parameters string
     * @param params - Parameters to canonicalize
     * @returns Canonical parameters string
     */
    static getCanonicalParams(params = {}) {
        const paramStrings = [];
        for (const key in params) {
            let value = params[key];
            if (!key) {
                continue;
            }
            if (!value) {
                value = "";
            }
            const normalizedKey = HttpUtils.normalize(key.trim());
            const normalizedValue = HttpUtils.normalize(value.toString().trim());
            paramStrings.push(normalizedKey + '=' + normalizedValue);
        }
        paramStrings.sort();
        let strQuery = "";
        for (const i in paramStrings) {
            const kv = paramStrings[i];
            strQuery += strQuery.length === 0 ? "" : "&";
            strQuery += kv;
        }
        return strQuery;
    }
    /**
     * Signs a string using RSA-SHA256
     * @param secretKey - Private key for signing
     * @param str - String to sign
     * @returns Signature
     */
    static signature(secretKey, str) {
        let r = secretKey;
        let a = "-----BEGIN PRIVATE KEY-----";
        let b = "-----END PRIVATE KEY-----";
        let private_key = "";
        let len = r.length;
        let start = 0;
        while (start <= len) {
            if (private_key.length) {
                private_key += r.substr(start, 64) + '\n';
            }
            else {
                private_key = r.substr(start, 64) + '\n';
            }
            start += 64;
        }
        private_key = a + '\n' + private_key + b;
        let sign = crypto.createSign('RSA-SHA256');
        sign.update(str);
        let sig = sign.sign(private_key, 'base64');
        // URL safe processing
        sig = sig.replace(/[+]/g, '-');
        sig = sig.replace(/[/]/g, '_');
        // Remove extra '='
        let sig_len = sig.length;
        let find_len = 0;
        let start_len = sig_len - 1;
        while (true) {
            if (sig.substr(start_len, 1) === "=") {
                find_len++;
                start_len--;
                continue;
            }
            break;
        }
        sig = sig.substr(0, sig_len - find_len);
        let signToBase64 = sig;
        signToBase64 += '$SHA256';
        return signToBase64;
    }
}
CashierSupport.CASHIER_URL = "https://cash.yeepay.com/cashier/std";
export default CashierSupport;
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