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// --------------------------------------------------------------------------
//
// File
// Name: S3Client.cpp
// Purpose: Amazon S3 client helper implementation class
// Created: 09/01/2009
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <cstring>
// #include <cstdio>
// #include <ctime>
#include <openssl/hmac.h>
#include "HTTPRequest.h"
#include "HTTPResponse.h"
#include "HTTPServer.h"
#include "autogen_HTTPException.h"
#include "IOStream.h"
#include "Logging.h"
#include "S3Client.h"
#include "decode.h"
#include "encode.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: S3Client::GetObject(const std::string& rObjectURI)
// Purpose: Retrieve the object with the specified URI (key)
// from your S3 bucket.
// Created: 09/01/09
//
// --------------------------------------------------------------------------
HTTPResponse S3Client::GetObject(const std::string& rObjectURI)
{
return FinishAndSendRequest(HTTPRequest::Method_GET, rObjectURI);
}
// --------------------------------------------------------------------------
//
// Function
// Name: S3Client::PutObject(const std::string& rObjectURI,
// IOStream& rStreamToSend, const char* pContentType)
// Purpose: Upload the stream to S3, creating or overwriting the
// object with the specified URI (key) in your S3
// bucket.
// Created: 09/01/09
//
// --------------------------------------------------------------------------
HTTPResponse S3Client::PutObject(const std::string& rObjectURI,
IOStream& rStreamToSend, const char* pContentType)
{
return FinishAndSendRequest(HTTPRequest::Method_PUT, rObjectURI,
&rStreamToSend, pContentType);
}
// --------------------------------------------------------------------------
//
// Function
// Name: S3Client::FinishAndSendRequest(
// HTTPRequest::Method Method,
// const std::string& rRequestURI,
// IOStream* pStreamToSend,
// const char* pStreamContentType)
// Purpose: Internal method which creates an HTTP request to S3,
// populates the date and authorization header fields,
// and sends it to S3 (or the simulator), attaching
// the specified stream if any to the request. Opens a
// connection to the server if necessary, which may
// throw a ConnectionException. Returns the HTTP
// response returned by S3, which may be a 500 error.
// Created: 09/01/09
//
// --------------------------------------------------------------------------
HTTPResponse S3Client::FinishAndSendRequest(HTTPRequest::Method Method,
const std::string& rRequestURI, IOStream* pStreamToSend,
const char* pStreamContentType)
{
HTTPRequest request(Method, rRequestURI);
request.SetHostName(mHostName);
std::ostringstream date;
time_t tt = time(NULL);
struct tm *tp = gmtime(&tt);
if (!tp)
{
BOX_ERROR("Failed to get current time");
THROW_EXCEPTION(HTTPException, Internal);
}
const char *dow[] = {"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
date << dow[tp->tm_wday] << ", ";
const char *month[] = {"Jan","Feb","Mar","Apr","May","Jun",
"Jul","Aug","Sep","Oct","Nov","Dec"};
date << std::internal << std::setfill('0') <<
std::setw(2) << tp->tm_mday << " " <<
month[tp->tm_mon] << " " <<
(tp->tm_year + 1900) << " ";
date << std::setw(2) << tp->tm_hour << ":" <<
std::setw(2) << tp->tm_min << ":" <<
std::setw(2) << tp->tm_sec << " GMT";
request.AddHeader("Date", date.str());
if (pStreamContentType)
{
request.AddHeader("Content-Type", pStreamContentType);
}
std::string s3suffix = ".s3.amazonaws.com";
std::string bucket;
if (mHostName.size() > s3suffix.size())
{
std::string suffix = mHostName.substr(mHostName.size() -
s3suffix.size(), s3suffix.size());
if (suffix == s3suffix)
{
bucket = mHostName.substr(0, mHostName.size() -
s3suffix.size());
}
}
std::ostringstream data;
data << request.GetVerb() << "\n";
data << "\n"; /* Content-MD5 */
data << request.GetContentType() << "\n";
data << date.str() << "\n";
if (! bucket.empty())
{
data << "/" << bucket;
}
data << request.GetRequestURI();
std::string data_string = data.str();
unsigned char digest_buffer[EVP_MAX_MD_SIZE];
unsigned int digest_size = sizeof(digest_buffer);
/* unsigned char* mac = */ HMAC(EVP_sha1(),
mSecretKey.c_str(), mSecretKey.size(),
(const unsigned char*)data_string.c_str(),
data_string.size(), digest_buffer, &digest_size);
std::string digest((const char *)digest_buffer, digest_size);
base64::encoder encoder;
std::string auth_code = "AWS " + mAccessKey + ":" +
encoder.encode(digest);
if (auth_code[auth_code.size() - 1] == '\n')
{
auth_code = auth_code.substr(0, auth_code.size() - 1);
}
request.AddHeader("Authorization", auth_code);
if (mpSimulator)
{
if (pStreamToSend)
{
pStreamToSend->CopyStreamTo(request);
}
request.SetForReading();
CollectInBufferStream response_buffer;
HTTPResponse response(&response_buffer);
mpSimulator->Handle(request, response);
return response;
}
else
{
try
{
if (!mapClientSocket.get())
{
mapClientSocket.reset(new SocketStream());
mapClientSocket->Open(Socket::TypeINET,
mHostName, mPort);
}
return SendRequest(request, pStreamToSend,
pStreamContentType);
}
catch (ConnectionException &ce)
{
if (ce.GetType() == ConnectionException::SocketWriteError)
{
// server may have disconnected us,
// try to reconnect, just once
mapClientSocket->Open(Socket::TypeINET,
mHostName, mPort);
return SendRequest(request, pStreamToSend,
pStreamContentType);
}
else
{
throw;
}
}
}
}
// --------------------------------------------------------------------------
//
// Function
// Name: S3Client::SendRequest(HTTPRequest& rRequest,
// IOStream* pStreamToSend,
// const char* pStreamContentType)
// Purpose: Internal method which sends a pre-existing HTTP
// request to S3. Attaches the specified stream if any
// to the request. Opens a connection to the server if
// necessary, which may throw a ConnectionException.
// Returns the HTTP response returned by S3, which may
// be a 500 error.
// Created: 09/01/09
//
// --------------------------------------------------------------------------
HTTPResponse S3Client::SendRequest(HTTPRequest& rRequest,
IOStream* pStreamToSend, const char* pStreamContentType)
{
HTTPResponse response;
if (pStreamToSend)
{
rRequest.SendWithStream(*mapClientSocket,
30000 /* milliseconds */,
pStreamToSend, response);
}
else
{
rRequest.Send(*mapClientSocket, 30000 /* milliseconds */);
response.Receive(*mapClientSocket, 30000 /* milliseconds */);
}
return response;
}
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