Android Https证书过期解决方案

  应该有很多小伙伴遇到这样一个问题，在线上已发布的app里，关于https的cer证书过期，从而导致app所有网络请求失效无法使用。
  这个时候有人就要说了，应急发布一个已更新最新cer证书的apk不就完事了么，其实没那么简单，iOS还好可以通过appstore提供的api查询到新版本，但android就不一样了，需要调用自己Server端提供的api接口查询到新版本，并获取apk下载路径，问题是https都不能访问了，如何请求到版本信息呢？
  博主在这里提供2种解决方案
  方案一：将版本信息接口让后台改成http（不推荐，后台因素不可控），或者将本地https的设置一个不安全校验（推荐），代码如下:

private static OkHttpClient newOkHttpClient(int timeout){

        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
        logging.setLevel(HttpLoggingInterceptor.Level.BODY);

        return new OkHttpClient.Builder()
                .addInterceptor(new RequestInfoInterceptor())
                //.addInterceptor(logging)
                .addNetworkInterceptor(new TokenHeaderInterceptor())
                .sslSocketFactory(Certificate.getSSLSocketFactory())
                //设置不安全校验
                .hostnameVerifier(Certificate.getUnSafeHostnameVerifier())
                .readTimeout(timeout, TimeUnit.SECONDS)
                .writeTimeout(timeout, TimeUnit.SECONDS)
                .build();
    }

    /**
     *获取HostnameVerifier 
     */
    public static HostnameVerifier getUnSafeHostnameVerifier() {
        HostnameVerifier hostnameVerifier = new HostnameVerifier() {
            @Override
            public boolean verify(String s, SSLSession sslSession) {
                return true;
            }
        };
        return hostnameVerifier;
    }

  方案二：将xxx.cer证书改成动态读取（以文件的方式从app沙盒里面读取即可），在https证书即将过期时，从服务器下载最新的cer证书更新到沙盒里面，App每次初始化网络请求时读取sdcard最新的证书文件，这样App就永远不会出现https证书过期导致无法使用的问题，流程图如下：

image.png

这里粘贴关键设置cer证书的代码

    private static OkHttpClient newOkHttpClient(int timeout){

        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
        logging.setLevel(HttpLoggingInterceptor.Level.BODY);

        return new OkHttpClient.Builder()
                .addInterceptor(new RequestInfoInterceptor())
                //.addInterceptor(logging)
                .addNetworkInterceptor(new TokenHeaderInterceptor())
                .sslSocketFactory(Certificate.getSSLSocketFactory(BaseApplcation.myApp, new String[]{"/sdcard/xxx.cer"}))
                .hostnameVerifier(Certificate.getUnSafeHostnameVerifier())
                .readTimeout(timeout, TimeUnit.SECONDS)
                .writeTimeout(timeout, TimeUnit.SECONDS)
                .build();
    }
  
    /**
     * 带证书的，从本地文件读取
     * @param context
     * @param certificatesFiles  本地文件（通过下载到本地）
     * @return
     */
    public static SSLSocketFactory getSSLSocketFactory(Context context, String[] certificatesFiles) {
        if (context == null) {
            throw new NullPointerException("context == null");
        }
        CertificateFactory certificateFactory;
        try {
            certificateFactory = CertificateFactory.getInstance("X.509");
            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
            keyStore.load(null, null);

            for (int i = 0; i < certificatesFiles.length; i++) {
                InputStream certificate = new FileInputStream(certificatesFiles[i]);
                keyStore.setCertificateEntry(String.valueOf(i), certificateFactory.generateCertificate(certificate));

                if (certificate != null) {
                    certificate.close();
                }
            }
            SSLContext sslContext = SSLContext.getInstance("TLS");
            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            trustManagerFactory.init(keyStore);
            sslContext.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom());
            return sslContext.getSocketFactory();
        } catch (Exception e) {

        }
        return null;
    }

  /**
     * 带证书的，从raw资源中读取
     * @param context
     * @param certificates  rawIds
     * @return
     */
    public static SSLSocketFactory getSSLSocketFactory(Context context, int[] certificates) {
        if (context == null) {
            throw new NullPointerException("context == null");
        }
        CertificateFactory certificateFactory;
        try {
            certificateFactory = CertificateFactory.getInstance("X.509");
            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
            keyStore.load(null, null);

            for (int i = 0; i < certificates.length; i++) {
                InputStream certificate = context.getResources().openRawResource(certificates[i]);
                keyStore.setCertificateEntry(String.valueOf(i), certificateFactory.generateCertificate(certificate));

                if (certificate != null) {
                    certificate.close();
                }
            }
            SSLContext sslContext = SSLContext.getInstance("TLS");
            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            trustManagerFactory.init(keyStore);
            sslContext.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom());
            return sslContext.getSocketFactory();
        } catch (Exception e) {

        }
        return null;
    }

总结一下，方案一需要App升级解决证书过期问题，方案二无需升级即可解决升级问题，小伙伴们，设置证书用哪种方式，心里有答案了吧。
代码虽简单，就当做个笔记。