应用服务器核心代码解析

应用服务器源码包含了签名直传服务和上传回调服务两个功能。

• 签名直传服务

  签名直传服务响应客户端发送给应用服务器的GET消息，代码片段如下：

  

  protected void doGet(HttpServletRequest request, HttpServletResponse response)
              throws ServletException, IOException {
  
          String accessId = "<yourAccessKeyId>"; // 请填写您的AccessKeyId。
          String accessKey = "<yourAccessKeySecret>"; // 请填写您的AccessKeySecret。
          String endpoint = "oss-cn-hangzhou.aliyuncs.com"; // 请填写您的 endpoint。
          String bucket = "bucket-name"; // 请填写您的 bucketname 。
          String host = "//" + bucket + "." + endpoint; // host的格式为 bucketname.endpoint
          // callbackUrl为 上传回调服务器的URL，请将下面的IP和Port配置为您自己的真实信息。
          String callbackUrl = "//88.88.88.88:8888";
          String dir = "user-dir-prefix/"; // 用户上传文件时指定的前缀。
  
          // 创建OSSClient实例。
          OSS ossClient = new OSSClientBuilder().build(endpoint, accessId, accessKey);
          try {
              long expireTime = 30;
              long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
              Date expiration = new Date(expireEndTime);
              // PostObject请求最大可支持的文件大小为5 GB，即CONTENT_LENGTH_RANGE为5*1024*1024*1024。
              PolicyConditions policyConds = new PolicyConditions();
              policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
              policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);
  
              String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
              byte[] binaryData = postPolicy.getBytes("utf-8");
              String encodedPolicy = BinaryUtil.toBase64String(binaryData);
              String postSignature = ossClient.calculatePostSignature(postPolicy);
  
              Map<String, String> respMap = new LinkedHashMap<String, String>();
              respMap.put("accessid", accessId);
              respMap.put("policy", encodedPolicy);
              respMap.put("signature", postSignature);
              respMap.put("dir", dir);
              respMap.put("host", host);
              respMap.put("expire", String.valueOf(expireEndTime / 1000));
              // respMap.put("expire", formatISO8601Date(expiration));
  
              JSONObject jasonCallback = new JSONObject();
              jasonCallback.put("callbackUrl", callbackUrl);
              jasonCallback.put("callbackBody",
                      "filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}");
              jasonCallback.put("callbackBodyType", "application/x-www-form-urlencoded");
              String base64CallbackBody = BinaryUtil.toBase64String(jasonCallback.toString().getBytes());
              respMap.put("callback", base64CallbackBody);
  
              JSONObject ja1 = JSONObject.fromObject(respMap);
              // System.out.println(ja1.toString());
              response.setHeader("Access-Control-Allow-Origin", "*");
              response.setHeader("Access-Control-Allow-Methods", "GET, POST");
              response(request, response, ja1.toString());
  
          } catch (Exception e) {
              // Assert.fail(e.getMessage());
              System.out.println(e.getMessage());
          } finally { 
              ossClient.shutdown();
          }
      }

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• 上传回调服务

  上传回调服务响应OSS发送给应用服务器的POST消息，代码片段如下：

  

  protected boolean VerifyOSSCallbackRequest(HttpServletRequest request, String ossCallbackBody)
              throws NumberFormatException, IOException {
          boolean ret = false;
          String autorizationInput = new String(request.getHeader("Authorization"));
          String pubKeyInput = request.getHeader("x-oss-pub-key-url");
          byte[] authorization = BinaryUtil.fromBase64String(autorizationInput);
          byte[] pubKey = BinaryUtil.fromBase64String(pubKeyInput);
          String pubKeyAddr = new String(pubKey);
          if (!pubKeyAddr.startsWith("//gosspublic.alicdn.com/")
                  && !pubKeyAddr.startsWith("//gosspublic.alicdn.com/")) {
              System.out.println("pub key addr must be oss addrss");
              return false;
          }
          String retString = executeGet(pubKeyAddr);
          retString = retString.replace("-----BEGIN PUBLIC KEY-----", "");
          retString = retString.replace("-----END PUBLIC KEY-----", "");
          String queryString = request.getQueryString();
          String uri = request.getRequestURI();
          String decodeUri = java.net.URLDecoder.decode(uri, "UTF-8");
          String authStr = decodeUri;
          if (queryString != null && !queryString.equals("")) {
              authStr += "?" + queryString;
          }
          authStr += "\n" + ossCallbackBody;
          ret = doCheck(authStr, authorization, retString);
          return ret;
      }
  
      protected void doPost(HttpServletRequest request, HttpServletResponse response)
              throws ServletException, IOException {
          String ossCallbackBody = GetPostBody(request.getInputStream(),
                  Integer.parseInt(request.getHeader("content-length")));
          boolean ret = VerifyOSSCallbackRequest(request, ossCallbackBody);
          System.out.println("verify result : " + ret);
          // System.out.println("OSS Callback Body:" + ossCallbackBody);
          if (ret) {
              response(request, response, "{\"Status\":\"OK\"}", HttpServletResponse.SC_OK);
          } else {
              response(request, response, "{\"Status\":\"verify not ok\"}", HttpServletResponse.SC_BAD_REQUEST);
          }
      }

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