使用c++ GSOAP客户端访问Amazon S3服务

Access Amazon S3 services with C++ GSOAP client

本文关键字：Amazon S3 服务 访问 客户端 c++ GSOAP 使用      更新时间：2023-10-16

我开始开发一个使用SOAP API访问Amazon S3存储的应用程序。

我读过的文档说，如果文件大小大于1 MB，必须使用PutObject方法。现在PutObject使用DIME附件。

是否有一个示例代码或示例或代码片段，有人可以向我展示如何使用GSOAP为Amazon S3的PutObject方法做DIME附件。

我想使用GSOAP，因为它具有可移植性并使其具有通用性。出于同样的原因，我不想使用Amazon提供的。net API。我特别想在GSOAP中工作，因为我以前在GSOAP中工作过。

谢谢,大卫

我把一些东西放在一起，使用PutObject上传大于1MB的文件，它也应该适用于较小的文件。我把它分享给可能有用的人。

也可以参阅我以前的文章使用GSOAP访问S3 AMAZON AWS S3使用GSOAP c++该链接还包含生成签名的方法。

下面是PutObject的代码。

它使用来自sourceforge的最新GSOAP。

在wsdl2h生成报头和soapcpp2生成gsoap客户端代码之后，下面将是访问服务PutObject......

的代码

要求:使用编译器预处理器指令WITH_OPENSSL构建OpenSSL GSOAP。包括库文件libay32和ssleay32。从上面的链接中获取生成签名的方法。

void PutObject(char *filename)
{
    AmazonS3SoapBindingProxy amazonS3Interface;   
    struct soap*                         soapPtr;
   soapPtr = dynamic_cast<struct soap*>(&amazonS3Interface);  
   soap_init2(soapPtr, SOAP_IO_DEFAULT|SOAP_IO_KEEPALIVE, SOAP_IO_DEFAULT|SOAP_IO_KEEPALIVE);
    soap_ssl_client_context(&amazonS3Interface,
     SOAP_SSL_NO_AUTHENTICATION,  /* for encryption w/o authentication */
    /* SOAP_SSL_DEFAULT | SOAP_SSL_SKIP_HOST_CHECK, */  /* if we don't want the host name checks since these will change from machine to machine */
    /*SOAP_SSL_DEFAULT,*/   /* use SOAP_SSL_DEFAULT in production code */
    NULL,               /* keyfile (cert+key): required only when client must authenticate to server (see SSL docs to create this file) */
    NULL,               /* password to read the keyfile */
    NULL,       /* optional cacert file to store trusted certificates, use cacerts.pem for all public certificates issued by common CAs */
    NULL,               /* optional capath to directory with trusted certificates */
    NULL                /* if randfile!=NULL: use a file with random data to seed randomness */
  );

    //use this if you are behind a proxy to connect to internet
    amazonS3Interface.proxy_host="proxyservername"; //proxyservername
    amazonS3Interface.proxy_port=4050; //proxy port
    amazonS3Interface.proxy_userid="username"; //proxy authentication
    amazonS3Interface.proxy_passwd="password";
    amazonS3Interface.proxy_http_version="1.1"; //http ver
    amazonS3Interface.dime_id_format ="uuid:09233523-345b-4351-b623-5dsf35sgs5d6-%x"; 
   // Set callback functions   
   soapPtr->fdimereadopen   = dime_read_open;  
   soapPtr->fdimereadclose  = dime_read_close;   
   soapPtr->fdimeread       =dime_read;      
    _ns1__PutObject preq;
    _ns1__PutObjectResponse presp;
    ns1__PutObjectResult res;
    FILE *fp=fopen(filename,"rb");
    fseek(fp, 0L, SEEK_END); 
    size_t sz = ftell(fp);
    fseek(fp, 0L, SEEK_SET); 
    preq.Bucket=std::string("FGTSDrive");//bucket name to put file in
    preq.AWSAccessKeyId=new std::string("ACCESSKEY");//access key here
    char *sig=aws_signature("SECRETKEY","AmazonS3","PutObject",xml_datetime(),NULL);//correct secretkey here
    preq.Signature=new std::string(sig);
    preq.Timestamp=new time_t(time(NULL));
    preq.Key=std::string(filename);//name of the key ie the filename
   int result(0);   
   preq.ContentLength=sz; //length of the file
   ns1__MetadataEntry med;
   med.Name=std::string("Content-Type");
   med.Value=std::string("application/zip");//change the type depending on the file extenstion
   med.soap=&amazonS3Interface;
   preq.Metadata.push_back(&med);
   soap_set_dime(soapPtr);   
   result =soap_set_dime_attachment(soapPtr,  (char*)fp, sz,"application/zip", NULL, 0,filename);//change the content type depending on the file extenstion
  if (result != SOAP_OK) {     }
  result = amazonS3Interface.PutObject(&preq, &presp);
   if (result != SOAP_OK) {   }
amazonS3Interface.soap_stream_fault(std::cout);
}

static void *dime_read_open(struct soap *soap, void *handle, const char *id, const char *type, const char *options)
{ // we should return NULL without setting soap->error if we don't want to use the streaming callback for this DIME attachment. The handle contains the non-NULL __ptr field value which should have been set in the application.
  // return value of this function will be passed on to the fdimeread and fdimereadclose callbacks. The return value will not affect the __ptr field.
    std::cout <<"dime_read_open"<<std::endl;
  return handle;
}
static void dime_read_close(struct soap *soap, void *handle)
{ 
    std::cout <<"dime_read_close"<<std::endl;
    fclose((FILE*)handle);
}
static size_t dime_read(struct soap *soap, void *handle, char *buf, size_t len)
{ 
    std::cout <<"dime_read_read"<<std::endl;
    return fread(buf, 1, len, (FILE*)handle);
}

希望有帮助。

谢谢,大卫。

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