JAVA高级面试进阶训练营视频教程

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import java.io.File;

 

import  com.amazonaws.AmazonClientException;

import  com.amazonaws.auth.profile.ProfileCredentialsProvider;

import  com.amazonaws.services.s3.transfer.TransferManager;

import  com.amazonaws.services.s3.transfer.Upload;

 

public  class  UploadObjectMultipartUploadUsingHighLevelAPI {

 

     public  static  void  main(String[] args)  throws  Exception {

         String existingBucketName =  "*** Provide existing bucket name ***" ;

         String keyName            =  "*** Provide object key ***" ;

         String filePath           =  "*** Path to and name of the file to upload ***" ; 

         

         TransferManager tm =  new  TransferManager( new  ProfileCredentialsProvider());       

         System.out.println( "Hello" );

         // TransferManager processes all transfers asynchronously,

         // so this call will return immediately.

         Upload upload = tm.upload(

                 existingBucketName, keyName,  new  File(filePath));

         System.out.println( "Hello2" );

 

         try  {

             // Or you can block and wait for the upload to finish

             upload.waitForCompletion();

             System.out.println( "Upload complete." );

         }  catch  (AmazonClientException amazonClientException) {

             System.out.println( "Unable to upload file, upload was aborted." );

             amazonClientException.printStackTrace();

         }

     }

}

问题描述：使用s3 java sdk 的如上代码分片文件上传，报‘SignatureDoesNotMatch’ 异常如下

Unable to abort multipart upload, you may need to manually remove uploaded parts: null (Service: Amazon S3; Status Code: 403; Error Code: SignatureDoesNotMatch; Request ID: tx000000000000000003ddf-005853b76e-1a56f9b-default)
com.amazonaws.services.s3.model.AmazonS3Exception: null (Service: Amazon S3; Status Code: 403; Error Code: SignatureDoesNotMatch; Request ID: tx000000000000000003ddf-005853b76e-1a56f9b-default), S3 Extended Request ID: 1a56f9b-default-default

 

 

 

定位过程：

下载s3 java sdk 源码，并配置好 log4j, 打印aws debug日志； 

# For JBoss: Avoid to setup Log4J outside $JBOSS_HOME/server/default/deploy/log4j.xml!
# For all other servers: Comment out the Log4J listener in web.xml to activate Log4J.
#log4j.rootLogger=INFO, stdout, logfile
log4j.rootLogger=INFO,stdout,logfile
log4j.logger.com.amazonaws = DEBUG
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - <%m>%n

RGW配置文件/etc/ceph/ceph.conf 中的日志级别调整为20，重启RGW进程

debug rgw = 20

 

执行分片上传代码，分别截获客户端和服务端的请求日志。 如下2个图片可以发现uploadId客户端和服务端不一致，导致服务端进行签名校验失败。

 

 

 

  

那么问题来了，到底是RGW服务端，还是java s3 sdk实现有bug呢？ 通过查看java 代码和aws文档描述，我认为是RGW签名实现存在bug。 RGW 应该在

获取从客户端url中的参数中值（已经被URLEncode）后，先decode，再根据aws文档描述的步骤进行encode（~特殊字符不encode），得到符合规则的参数字符串。 

.\src\rgw\rgw_rest_s3.cc

 

http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html

 

 

规避方案：

 

因为修改RGW的代码周期比较长，暂时先修改好修改的java代码，编译一个新的jar包。 如下是修改方法，不按照aws的规则来，对参数值只执行URLencode。

提交了一个bugfix到rgw git库, https://github.com/ceph/ceph/pull/12647/commits

 

 https://github.com/BodihTao/aws-sdk-java/blob/master/aws-java-sdk-core/src/main/java/com/amazonaws/auth/AbstractAWSSigner.java

 

为了方便大家，我上传修改后编译好的class文件（java 1.8版本），把这2个文件用winrar 放到aws-java-sdk-1.11.69.jar包中com/amazonaws/auth目录下 替换原来文件即可得到新的jar包。

https://github.com/BodihTao/aws-sdk-java/raw/master/aws-java-sdk/AbstractAWSSigner%241.class

https://github.com/BodihTao/aws-sdk-java/raw/master/aws-java-sdk/AbstractAWSSigner.class

 

java 1.7版本的sdk包：

http://s3.yyclouds.com/public/aws-java-sdk-1.11.69rgw.jar