const NodeRsa = require("node-rsa");
const fs = require("fs");
const path = require("path");
const config = require("../config");

class Rsa {
    constructor() {
        this.private_key = this.readFiles(this.getFilePath(config.rsa.private_key))
        this.public_key =  this.readFiles(this.getFilePath(config.rsa.public_key))

        this.pri_rsa = new NodeRsa(this.private_key,'pkcs8-private-pem')
        this.pri_rsa.setOptions({ encryptionScheme: 'pkcs1' }) 
        this.pri_rsa.setOptions({ environment: "browser" });

        this.pub_rsa = new NodeRsa(this.public_key,'pkcs8-public-pem')
        this.pub_rsa.setOptions({ encryptionScheme: 'pkcs1' }) 
        this.pub_rsa.setOptions({ environment: "browser" });

    }


    // 公钥加密
    PublicKeyEncryption(text) {
        return (new NodeRsa(this.public_key)).encrypt(JSON.stringify(text), 'base64')
    }

    // 公钥解密
    PublicKeyDecryption(text) {
        return JSON.parse((new NodeRsa(this.public_key)).decryptPublic(text, 'utf8'))
    }


    // 私钥加密
    PrivateKeyEncryption(text) {
        return (new NodeRsa(this.private_key)).encryptPrivate(JSON.stringify(text), 'base64')
    }

    // 私钥解密
    PrivateKeyDecryption(text) {
        return JSON.parse(this.pri_rsa.decrypt(text, 'utf8'))
    }

    /**
     * 获取path.join文件地址
     * @param paths
     * @returns {string}
     */
    getFilePath(paths) {
        return path.join(__dirname, paths)
    }

    /**
     * 读取文件数据
     * @param path
     * @returns {*}
     */
    readFiles(path) {
        return fs.readFileSync(path).toString()
    }
}

module.exports = new Rsa();