视频点播：HLS标准加密

下述Java示例代码中，您需要按实际情况变更的参数如下：

import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.http.ProtocolType;
import com.aliyuncs.vod.model.v20170321.DecryptKMSDataKeyRequest;
import com.aliyuncs.vod.model.v20170321.DecryptKMSDataKeyResponse;
import com.aliyuncs.profile.DefaultProfile;
import com.sun.net.httpserver.Headers;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.spi.HttpServerProvider;
import org.apache.commons.codec.binary.Base64;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.URI;import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class HlsDecryptServer {
    private static DefaultAcsClient client;
    static {
        //KMS的区域，必须与视频对应区域
        String region = "";
        // 访问KMS的授权AccessKey信息
        // 阿里云账号AccessKey拥有所有API的访问权限，建议您使用RAM用户进行API访问或日常运维。
        // 强烈建议不要把AccessKey ID和AccessKey Secret保存到工程代码里，否则可能导致AccessKey泄露，威胁您账号下所有资源的安全。
        // 本示例通过从环境变量中读取AccessKey，来实现API访问的身份验证。运行代码示例前，请配置环境变量ALIBABA_CLOUD_ACCESS_KEY_ID和ALIBABA_CLOUD_ACCESS_KEY_SECRET。
        String accessKeyId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
        String accessKeySecret = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
        client = new DefaultAcsClient(DefaultProfile.getProfile(region, accessKeyId, accessKeySecret));
    }
    /**
     * 说明：
     * 1、接收解密请求，获取密文密钥和用户令牌Token
     * 2、调用KMS decrypt接口获取明文密钥
     * 3、将明文密钥Base64 decode返回
     */
    public class HlsDecryptHandler implements HttpHandler {
        /**
         * 处理解密请求
         * @param httpExchange
         * @throws IOException
         */
        public void handle(HttpExchange httpExchange) throws IOException {
            String requestMethod = httpExchange.getRequestMethod();
            if ("GET".equalsIgnoreCase(requestMethod)) {
                //校验token的有效性
                String token = getMtsHlsUriToken(httpExchange);
                boolean validRe = validateToken(token);
                if (!validRe) {
                    return;
                }
                //从URL中取得密文密钥
                String ciphertext = getCiphertext(httpExchange);
                if (null == ciphertext)
                    return;
                //从KMS中解密出来，并Base64 decode
                byte[] key = decrypt(ciphertext);
                //设置header
                setHeader(httpExchange, key);
                //返回Base64 decode之后的密钥
                OutputStream responseBody = httpExchange.getResponseBody();
                responseBody.write(key);
                responseBody.close();
            }
        }
        private void setHeader(HttpExchange httpExchange, byte[] key) throws IOException {
            Headers responseHeaders = httpExchange.getResponseHeaders();
            responseHeaders.set("Access-Control-Allow-Origin", "*");
            httpExchange.sendResponseHeaders(HttpURLConnection.HTTP_OK, key.length);
        }
        /**
         * 调用KMS decrypt接口解密，并将明文Base64 decode
         * @param ciphertext
         * @return
         */
        private byte[] decrypt(String ciphertext) {
            DecryptKMSDataKeyRequest request = new DecryptKMSDataKeyRequest();
            request.setCipherText(ciphertext);
            request.setProtocol(ProtocolType.HTTPS);
            try {
                DecryptKMSDataKeyResponse response = client.getAcsResponse(request);
                String plaintext = response.getPlaintext();
                System.out.println("PlainText: " + plaintext);
                //注意：需要Base64 decode
                return Base64.decodeBase64(plaintext);
            } catch (ClientException e) {
                e.printStackTrace();
                return null;
            }
        }
        /**
         * 从URL中获取密文密钥参数
         * @param httpExchange
         * @return
         */
        private String getCiphertext(HttpExchange httpExchange) {
            URI uri = httpExchange.getRequestURI();
            String queryString = uri.getQuery();
            String pattern = "CipherText=(\\w*)";
            Pattern r = Pattern.compile(pattern);
            Matcher m = r.matcher(queryString);
            if (m.find())
                return m.group(1);
            else {
                System.out.println("Not Found CipherText Param");
                return null;
            }
        }
        
          /**
         * 校验令牌有效性 M3U8标准加密改写必备
         * @param token
         * @return
         */
        private boolean validateToken(String token) {
            if (null == token || "".equals(token)) {
                return false;
            }
            //TODO 业务方实现令牌有效性校验
            return true;
        }
        /**
         * 获取Token参数 M3U8标准加密改写必备
         *
         * @param httpExchange
         * @return
         */
        private String getMtsHlsUriToken(HttpExchange httpExchange) {
            URI uri = httpExchange.getRequestURI();
            String queryString = uri.getQuery();
            String pattern = "MtsHlsUriToken=(\\w*)";
            Pattern r = Pattern.compile(pattern);
            Matcher m = r.matcher(queryString);
            if (m.find())
                return m.group(1);
            else {
                System.out.println("Not Found MtsHlsUriToken Param");
                return null;
            }
        }
    }
    /**
     * 服务启动
     *
     * @throws IOException
     */
    private void serviceBootStrap() throws IOException {
        HttpServerProvider provider = HttpServerProvider.provider();
        //监听端口可以自定义，能同时接受最多30个请求
        HttpServer httpserver = provider.createHttpServer(new InetSocketAddress(8099), 30);
        httpserver.createContext("/", new HlsDecryptHandler());
        httpserver.start();
        System.out.println("hls decrypt server started");
    }
    public static void main(String[] args) throws IOException {
        HlsDecryptServer server = new HlsDecryptServer();
        server.serviceBootStrap();
    }}

流程

• 播放器解析M3U8文件中的EXT-X-KEY标签，获取解密密钥URI，该URI对应加密配置 EncryptConfig中的DecryptKeyUri参数值。

• 为限制非法访问，播放器需携带认证信息（通过MtsHlsUriToken参数传递）请求解密接口。

• 播放器自动请求解密接口获取密钥，解密加密的TS文件后正常播放。

示例

• 视频的播放地址为：https://demo.aliyundoc.com/encrypt-stream****-hd.m3u8，则请求时需要携带MtsHlsUriToken参数传入

• 最终请求地址为：https://demo.aliyundoc.com/encrypt-stream****-hd.m3u8?MtsHlsUriToken=<令牌>

• 解密地址为：https://demo.aliyundoc.com?CipherText=ZjJmZGViNzUtZWY1Mi00Y2RlLTk3MTMtOT****

• 最终解密请求地址为：https://demo.aliyundoc.com?CipherText=ZjJmZGViNzUtZWY1Mi00Y2RlLTk3MTMtOT****&MtsHlsUriToken=<颁发的令牌>

下述Java示例代码中，您需要按实际情况变更的参数如下：

import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.http.ProtocolType;
import com.aliyuncs.profile.DefaultProfile;
import com.aliyuncs.vod.model.v20170321.DecryptKMSDataKeyRequest;
import com.aliyuncs.vod.model.v20170321.DecryptKMSDataKeyResponse;
import com.sun.net.httpserver.Headers;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import com.sun.net.httpserver.spi.HttpServerProvider;
import org.apache.commons.codec.binary.Base64;

import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.URI;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HlsDecryptServerNoToken {

    private static DefaultAcsClient client;
    static {
        //KMS的区域，必须与视频对应区域
        String region = "cn-beijing";
        //访问KMS的授权AccessKey信息
        // 阿里云账号AccessKey拥有所有API的访问权限，建议您使用RAM用户进行API访问或日常运维。
        // 强烈建议不要把AccessKey ID和AccessKey Secret保存到工程代码里，否则可能导致AccessKey泄露，威胁您账号下所有资源的安全。
        // 本示例通过从环境变量中读取AccessKey，来实现API访问的身份验证。运行代码示例前，请配置环境变量ALIBABA_CLOUD_ACCESS_KEY_ID和ALIBABA_CLOUD_ACCESS_KEY_SECRET。
        String accessKeyId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
        String accessKeySecret = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
        client = new DefaultAcsClient(DefaultProfile.getProfile(region, accessKeyId, accessKeySecret));
    }
    /**
     * 说明：
     * 1、接收解密请求，获取密文密钥和令牌Token
     * 2、调用KMS decrypt接口获取明文密钥
     * 3、将明文密钥base64decode返回
     */
    public class HlsDecryptHandler implements HttpHandler {
        /**
         * 处理解密请求
         * @param httpExchange
         * @throws IOException
         */
        public void handle(HttpExchange httpExchange) throws IOException {
            String requestMethod = httpExchange.getRequestMethod();
            if ("GET".equalsIgnoreCase(requestMethod)) {

                //从URL中取得密文密钥
                String ciphertext = getCiphertext(httpExchange);
                System.out.println(ciphertext);
                if (null == ciphertext)
                    return;
                //从KMS中解密出来，并Base64 decode
                byte[] key = decrypt(ciphertext);
                //设置header
                setHeader(httpExchange, key);
                //返回base64decode之后的密钥
                OutputStream responseBody = httpExchange.getResponseBody();
                responseBody.write(key);
                responseBody.close();
            }
        }
        private void setHeader(HttpExchange httpExchange, byte[] key) throws IOException {
            Headers responseHeaders = httpExchange.getResponseHeaders();
            responseHeaders.set("Access-Control-Allow-Origin", "*");
            httpExchange.sendResponseHeaders(HttpURLConnection.HTTP_OK, key.length);
        }
        /**
         * 调用KMS decrypt接口解密，并将明文base64decode
         * @param ciphertext
         * @return
         */
        private byte[] decrypt(String ciphertext) {

            DecryptKMSDataKeyRequest request = new DecryptKMSDataKeyRequest();
            request.setCipherText(ciphertext);
            request.setProtocol(ProtocolType.HTTPS);
            try {
                DecryptKMSDataKeyResponse response = client.getAcsResponse(request);
                String plaintext = response.getPlaintext();
                System.out.println("PlainText: " + plaintext);
                //注意：需要base64 decode
                return Base64.decodeBase64(plaintext);
            } catch (ClientException e) {
                e.printStackTrace();
                return null;
            }
        }

        /**
         * 从URL中获取密文密钥参数
         * @param httpExchange
         * @return
         */
        private String getCiphertext(HttpExchange httpExchange) {
            URI uri = httpExchange.getRequestURI();
            String queryString = uri.getQuery();
            String pattern = "CipherText=(\\w*)";
            Pattern r = Pattern.compile(pattern);
            Matcher m = r.matcher(queryString);
            if (m.find())
                return m.group(1);
            else {
                System.out.println("Not Found CipherText Param");
                return null;
            }
        }
    }

    /**
     * 服务启动
     *
     * @throws IOException
     */
    private void serviceBootStrap() throws IOException {
        HttpServerProvider provider = HttpServerProvider.provider();
        //监听端口可以自定义，能同时接受最多30个请求
        HttpServer httpserver = provider.createHttpServer(new InetSocketAddress(8099), 30);
        httpserver.createContext("/", new HlsDecryptHandler());
        httpserver.start();
        System.out.println("hls decrypt server started");
    }
    public static void main(String[] args) throws IOException {
        HlsDecryptServerNoToken server = new HlsDecryptServerNoToken();
        server.serviceBootStrap();
    }}

流程

• 播放器解析M3U8文件中的EXT-X-KEY标签，获取解密密钥URI，该URI对应加密配置 EncryptConfig中的DecryptKeyUri参数值。

• 播放器自动请求解密接口获取密钥，解密加密的TS文件后正常播放。

示例

• 视频的播放地址为：https://demo.aliyundoc.com/encrypt-stream****-hd.m3u8

• 最终请求地址为：https://demo.aliyundoc.com/encrypt-stream****-hd.m3u8

• 解密地址为：https://demo.aliyundoc.com?CipherText=ZjJmZGViNzUtZWY1Mi00Y2RlLTk3MTMtOT****

• 最终解密请求地址为：https://demo.aliyundoc.com?CipherText=ZjJmZGViNzUtZWY1Mi00Y2RlLTk3MTMtOT****