package com.glxp.api.util;

import cn.hutool.core.io.resource.ClassPathResource;
import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class RsaUtils {


    public static String publicKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtaHLiDtscnwyee4lG9jC" +
            "8GUEZYIuBoz49W3GSy2LEOVpKRyiQNCjRmybvQS5qKdsb3pV720HQJnv/nQLnsg/" +
            "vWbFc9L09fEeJdDZxQOf8D7CHeVgLd8+fh/GezQCVLijGlbAVORXOrFo5McdyOds" +
            "LJey1x4HxIR13a79JHB7sdve14A2aS6bQ7NPWu8hM9LpJd1hylsXgdBpR+iX3DPF" +
            "eep8Sx8jPnWfUfGF2pDNE3h1uz9RylGBYUz4tDPzz0IXO7vZkyUFXeslzKFDFcmh" +
            "hbn1tobX+al4XvfRpjoCjST2mRfqCt4aNuBDM1LHMzyMBVJpfui91ikLGMgP4Gdf" +
            "swIDAQAB";

    /**
     * RSA私钥加密
     */
    public static String privateKeyEncrypt(String str, String privateKey) throws Exception {
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(privateKey);
        PrivateKey priKey = KeyFactory.getInstance("RSA").
                generatePrivate(new PKCS8EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, priKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes()));
        return outStr;
    }

    /**
     * RSA公钥解密
     */
    public static String publicKeyDecrypt(String str, String publicKey) throws Exception {
        //64位解码加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
        //base64编码的私钥
        byte[] decoded = Base64.decodeBase64(publicKey);
        PublicKey pubKey = KeyFactory.getInstance("RSA")
                .generatePublic(new X509EncodedKeySpec(decoded));
        //RSA解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, pubKey);
        String outStr = new String(cipher.doFinal(inputByte));
        return outStr;
    }

    public static String readFileContent(String fileName) {
        ClassPathResource resource = new ClassPathResource("/config.txt");

        File file = new File(resource.getAbsolutePath());
        BufferedReader reader = null;
        StringBuffer sbf = new StringBuffer();
        try {
            reader = new BufferedReader(new FileReader(file));
            String tempStr;
            while ((tempStr = reader.readLine()) != null) {
                sbf.append(tempStr);
            }
            reader.close();
            return sbf.toString();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
        return sbf.toString();
    }

}