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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/autofill/browser/wallet/encryption_escrow_client.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/stringprintf.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/utf_string_conversions.h"
#include "components/autofill/browser/wallet/encryption_escrow_client_observer.h"
#include "components/autofill/browser/wallet/instrument.h"
#include "components/autofill/browser/wallet/wallet_service_url.h"
#include "googleurl/src/gurl.h"
#include "net/base/escape.h"
#include "net/http/http_status_code.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_context_getter.h"
namespace {
const char kEncryptOtpBodyFormat[] = "cvv=%s:%s";
const char kEscrowInstrumentInformationFormat[] = "gid=%s&cardNumber=%s&cvv=%s";
const char kEscrowCardVerficationNumberFormat[] = "gid=%s&cvv=%s";
const char kApplicationMimeType[] = "application/x-www-form-urlencoded";
// The maximum number of bits in the one time pad that the server is willing to
// accept.
const size_t kMaxBits = 56;
// The minimum number of bits in the one time pad that the server is willing to
// accept.
const size_t kMinBits = 40;
} // anonymous namespace
namespace autofill {
namespace wallet {
EncryptionEscrowClient::EncryptionEscrowClient(
net::URLRequestContextGetter* context_getter,
EncryptionEscrowClientObserver* observer)
: context_getter_(context_getter),
observer_(observer),
request_type_(NO_PENDING_REQUEST) {
DCHECK(context_getter_);
DCHECK(observer_);
}
EncryptionEscrowClient::~EncryptionEscrowClient() {}
void EncryptionEscrowClient::EncryptOneTimePad(
const std::vector<uint8>& one_time_pad) {
DCHECK_EQ(NO_PENDING_REQUEST, request_type_);
size_t num_bits = one_time_pad.size() * 8;
DCHECK_LE(num_bits, kMaxBits);
DCHECK_GE(num_bits, kMinBits);
request_type_ = ENCRYPT_ONE_TIME_PAD;
std::string post_body = base::StringPrintf(
kEncryptOtpBodyFormat,
base::HexEncode(&num_bits, 1).c_str(),
base::HexEncode(&(one_time_pad[0]), one_time_pad.size()).c_str());
MakeRequest(GetEncryptionUrl(), post_body);
}
void EncryptionEscrowClient::EscrowInstrumentInformation(
const Instrument& new_instrument,
const std::string& obfuscated_gaia_id) {
DCHECK_EQ(NO_PENDING_REQUEST, request_type_);
request_type_ = ESCROW_INSTRUMENT_INFORMATION;
const std::string& primary_account_number =
net::EscapeUrlEncodedData(
UTF16ToUTF8(new_instrument.primary_account_number()), true);
const std::string& card_verification_number =
net::EscapeUrlEncodedData(
UTF16ToUTF8(new_instrument.card_verification_number()), true);
std::string post_body = base::StringPrintf(
kEscrowInstrumentInformationFormat,
obfuscated_gaia_id.c_str(),
primary_account_number.c_str(),
card_verification_number.c_str());
MakeRequest(GetEscrowUrl(), post_body);
}
void EncryptionEscrowClient::EscrowCardVerificationNumber(
const std::string& card_verification_number,
const std::string& obfuscated_gaia_id) {
DCHECK_EQ(NO_PENDING_REQUEST, request_type_);
request_type_ = ESCROW_CARD_VERIFICATION_NUMBER;
std::string post_body = base::StringPrintf(
kEscrowCardVerficationNumberFormat,
obfuscated_gaia_id.c_str(),
card_verification_number.c_str());
MakeRequest(GetEscrowUrl(), post_body);
}
void EncryptionEscrowClient::CancelRequest() {
request_.reset();
request_type_ = NO_PENDING_REQUEST;
}
void EncryptionEscrowClient::MakeRequest(const GURL& url,
const std::string& post_body) {
DCHECK(!request_.get());
request_.reset(net::URLFetcher::Create(
1, url, net::URLFetcher::POST, this));
request_->SetRequestContext(context_getter_);
DVLOG(1) << "url=" << url << ", post_body=" << post_body;
request_->SetUploadData(kApplicationMimeType, post_body);
request_->Start();
observer_->OnDidMakeRequest();
}
// TODO(ahutter): Add manual retry logic if it's necessary.
void EncryptionEscrowClient::OnURLFetchComplete(
const net::URLFetcher* source) {
DCHECK(observer_);
scoped_ptr<net::URLFetcher> old_request = request_.Pass();
DCHECK_EQ(source, old_request.get());
DVLOG(1) << "Got response from " << source->GetOriginalURL();
RequestType type = request_type_;
request_type_ = NO_PENDING_REQUEST;
std::string data;
source->GetResponseAsString(&data);
DVLOG(1) << "Response body: " << data;
if (source->GetResponseCode() != net::HTTP_OK) {
observer_->OnNetworkError(source->GetResponseCode());
return;
}
if (data.empty()) {
HandleMalformedResponse(old_request.get());
return;
}
switch (type) {
case ENCRYPT_ONE_TIME_PAD: {
std::vector<std::string> splits;
// The response from the server should be formatted as
// "<session material>|<encrypted one time pad>".
base::SplitString(data, '|', &splits);
if (splits.size() == 2)
observer_->OnDidEncryptOneTimePad(splits[1], splits[0]);
else
HandleMalformedResponse(old_request.get());
break;
}
case ESCROW_INSTRUMENT_INFORMATION:
observer_->OnDidEscrowInstrumentInformation(data);
break;
case ESCROW_CARD_VERIFICATION_NUMBER:
observer_->OnDidEscrowCardVerificationNumber(data);
break;
case NO_PENDING_REQUEST:
NOTREACHED();
}
}
void EncryptionEscrowClient::HandleMalformedResponse(net::URLFetcher* request) {
// Called to inform exponential backoff logic of the error.
request->ReceivedContentWasMalformed();
observer_->OnMalformedResponse();
}
} // namespace wallet
} // namespace autofill
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