bool AWSAuthV4Signer::SignRequest(Aws::Http::HttpRequest& request, bool signBody) const
{
AWSCredentials credentials = m_credentialsProvider->GetAWSCredentials();
//don't sign anonymous requests
if (credentials.GetAWSAccessKeyId().empty() || credentials.GetAWSSecretKey().empty())
{
return true;
}
if (!credentials.GetSessionToken().empty())
{
request.SetAwsSessionToken(credentials.GetSessionToken());
}
Aws::String payloadHash(UNSIGNED_PAYLOAD);
if(signBody || request.GetUri().GetScheme() != Http::Scheme::HTTPS)
{
payloadHash.assign(ComputePayloadHash(request));
if (payloadHash.empty())
{
return false;
}
}
else
{
AWS_LOGSTREAM_DEBUG(v4LogTag, "Note: Http payloads are not being signed. signPayloads=" << m_signPayloads
<< " http scheme=" << Http::SchemeMapper::ToString(request.GetUri().GetScheme()));
}
if(m_includeSha256HashHeader)
{
request.SetHeaderValue("x-amz-content-sha256", payloadHash);
}
//calculate date header to use in internal signature (this also goes into date header).
DateTime now = GetSigningTimestamp();
Aws::String dateHeaderValue = now.ToGmtString(LONG_DATE_FORMAT_STR);
request.SetHeaderValue(AWS_DATE_HEADER, dateHeaderValue);
Aws::StringStream headersStream;
Aws::StringStream signedHeadersStream;
for (const auto& header : CanonicalizeHeaders(request.GetHeaders()))
{
if(ShouldSignHeader(header.first))
{
headersStream << header.first.c_str() << ":" << header.second.c_str() << NEWLINE;
signedHeadersStream << header.first.c_str() << ";";
}
}
Aws::String canonicalHeadersString = headersStream.str();
AWS_LOGSTREAM_DEBUG(v4LogTag, "Canonical Header String: " << canonicalHeadersString);
//calculate signed headers parameter
Aws::String signedHeadersValue = signedHeadersStream.str();
//remove that last semi-colon
signedHeadersValue.erase(signedHeadersValue.length() - 1);
AWS_LOGSTREAM_DEBUG(v4LogTag, "Signed Headers value:" << signedHeadersValue);
//generate generalized canonicalized request string.
Aws::String canonicalRequestString = CanonicalizeRequestSigningString(request, m_urlEscapePath);
//append v4 stuff to the canonical request string.
canonicalRequestString.append(canonicalHeadersString);
canonicalRequestString.append(NEWLINE);
canonicalRequestString.append(signedHeadersValue);
canonicalRequestString.append(NEWLINE);
canonicalRequestString.append(payloadHash);
AWS_LOGSTREAM_DEBUG(v4LogTag, "Canonical Request String: " << canonicalRequestString);
//now compute sha256 on that request string
auto hashResult = m_hash->Calculate(canonicalRequestString);
if (!hashResult.IsSuccess())
{
AWS_LOGSTREAM_ERROR(v4LogTag, "Failed to hash (sha256) request string \"" << canonicalRequestString << "\"");
return false;
}
auto sha256Digest = hashResult.GetResult();
Aws::String cannonicalRequestHash = HashingUtils::HexEncode(sha256Digest);
Aws::String simpleDate = now.ToGmtString(SIMPLE_DATE_FORMAT_STR);
Aws::String stringToSign = GenerateStringToSign(dateHeaderValue, simpleDate, cannonicalRequestHash);
auto finalSignature = GenerateSignature(credentials, stringToSign, simpleDate);
Aws::StringStream ss;
ss << AWS_HMAC_SHA256 << " " << CREDENTIAL << EQ << credentials.GetAWSAccessKeyId() << "/" << simpleDate
<< "/" << m_region << "/" << m_serviceName << "/" << AWS4_REQUEST << ", " << SIGNED_HEADERS << EQ
<< signedHeadersValue << ", " << SIGNATURE << EQ << finalSignature;
auto awsAuthString = ss.str();
AWS_LOGSTREAM_DEBUG(v4LogTag, "Signing request with: " << awsAuthString);
request.SetAwsAuthorization(awsAuthString);
return true;
}
std::shared_ptr<Aws::Http::HttpResponse> NetlibHttpClient::MakeRequest(
Aws::Http::HttpRequest& request,
Aws::Utils::RateLimits::RateLimiterInterface* readLimiter,
Aws::Utils::RateLimits::RateLimiterInterface* writeLimiter) const {
// AWS allows rate limiters to be passed around, but we are doing rate
// limiting on the logger plugin side and so don't implement this.
if (readLimiter != nullptr || writeLimiter != nullptr) {
LOG(WARNING) << "Read/write limiters are unsupported";
}
Aws::Http::URI uri = request.GetUri();
uri.SetPath(Aws::Http::URI::URLEncodePath(uri.GetPath()));
Aws::String url = uri.GetURIString();
bn::http::client client = TLSTransport().getClient();
bn::http::client::request req(url);
for (const auto& requestHeader : request.GetHeaders()) {
req << bn::header(requestHeader.first, requestHeader.second);
}
std::string body;
if (request.GetContentBody()) {
std::stringstream ss;
ss << request.GetContentBody()->rdbuf();
body = ss.str();
}
auto response = std::make_shared<Standard::StandardHttpResponse>(request);
try {
bn::http::client::response resp;
switch (request.GetMethod()) {
case Aws::Http::HttpMethod::HTTP_GET:
resp = client.get(req);
if (resp.status() == 301 || resp.status() == 302) {
VLOG(1) << "Attempting custom redirect as cpp-netlib does not support "
"redirects";
for (const auto& header : resp.headers()) {
if (header.first == "Location") {
req.uri(header.second);
resp = client.get(req);
}
}
}
break;
case Aws::Http::HttpMethod::HTTP_POST:
resp = client.post(req, body, request.GetContentType());
break;
case Aws::Http::HttpMethod::HTTP_PUT:
resp = client.put(req, body, request.GetContentType());
break;
case Aws::Http::HttpMethod::HTTP_HEAD:
resp = client.head(req);
break;
case Aws::Http::HttpMethod::HTTP_PATCH:
LOG(ERROR) << "cpp-netlib does not support HTTP PATCH";
return nullptr;
break;
case Aws::Http::HttpMethod::HTTP_DELETE:
resp = client.delete_(req);
break;
default:
LOG(ERROR) << "Unrecognized HTTP Method used: "
<< static_cast<int>(request.GetMethod());
return nullptr;
break;
}
response->SetResponseCode(
static_cast<Aws::Http::HttpResponseCode>(resp.status()));
for (const auto& header : resp.headers()) {
if (header.first == "content-type") {
response->SetContentType(header.second);
}
response->AddHeader(header.first, header.second);
}
response->GetResponseBody() << resp.body();
} catch (const std::exception& /*e*/) {
LOG(ERROR) << "Exception making HTTP request to URL: " << url;
return nullptr;
}
return response;
}
