Refactor CryptAuth component to be more testable.

components/proximity_auth/cryptauth/cryptauth_client.cc

-// Copyright 2014 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 "base/bind.h"
-#include "base/command_line.h"
-#include "components/proximity_auth/cryptauth/cryptauth_access_token_fetcher.h"
-#include "components/proximity_auth/cryptauth/cryptauth_api_call_flow.h"
-#include "components/proximity_auth/cryptauth/cryptauth_client.h"
-#include "components/proximity_auth/cryptauth/proto/cryptauth_api.pb.h"
-#include "components/proximity_auth/switches.h"
-#include "net/url_request/url_request_context_getter.h"
-
-namespace proximity_auth {
-
-namespace {
-
-// Default URL of Google APIs endpoint hosting CryptAuth.
-const char kDefaultCryptAuthHTTPHost[] = "https://www.googleapis.com";
-
-// URL subpath hosting the CryptAuth service.
-const char kCryptAuthPath[] = "cryptauth/v1/";
-
-// URL subpaths for each CryptAuth API.
-const char kGetMyDevicesPath[] = "deviceSync/getmydevices";
-const char kFindEligibleUnlockDevicesPath[] =
-    "deviceSync/findeligibleunlockdevices";
-const char kSendDeviceSyncTicklePath[] = "deviceSync/senddevicesynctickle";
-const char kToggleEasyUnlockPath[] = "deviceSync/toggleeasyunlock";
-const char kSetupEnrollmentPath[] = "enrollment/setupenrollment";
-const char kFinishEnrollmentPath[] = "enrollment/finishenrollment";
-
-// Query string of the API URL indicating that the response should be in a
-// serialized protobuf format.
-const char kQueryProtobuf[] = "?alt=proto";
-
-// Creates the full CryptAuth URL for endpoint to the API with |request_path|.
-GURL CreateRequestUrl(const std::string& request_path) {
-  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
-  GURL google_apis_url =
-      GURL(command_line->HasSwitch(switches::kCryptAuthHTTPHost)
-               ? command_line->GetSwitchValueASCII(switches::kCryptAuthHTTPHost)
-               : kDefaultCryptAuthHTTPHost);
-  return google_apis_url.Resolve(kCryptAuthPath + request_path +
-                                 kQueryProtobuf);
-}
-
-}  // namespace
-
-CryptAuthClient::CryptAuthClient(
-    scoped_ptr<CryptAuthAccessTokenFetcher> access_token_fetcher,
-    scoped_refptr<net::URLRequestContextGetter> url_request_context,
-    const cryptauth::DeviceClassifier& device_classifier)
-    : url_request_context_(url_request_context),
-      access_token_fetcher_(access_token_fetcher.Pass()),
-      device_classifier_(device_classifier),
-      weak_ptr_factory_(this) {
-}
-
-CryptAuthClient::~CryptAuthClient() {
-}
-
-void CryptAuthClient::GetMyDevices(
-    const cryptauth::GetMyDevicesRequest& request,
-    const GetMyDevicesCallback& callback,
-    const ErrorCallback& error_callback) {
-  MakeApiCall(kGetMyDevicesPath, request, callback, error_callback);
-}
-
-void CryptAuthClient::FindEligibleUnlockDevices(
-    const cryptauth::FindEligibleUnlockDevicesRequest& request,
-    const FindEligibleUnlockDevicesCallback& callback,
-    const ErrorCallback& error_callback) {
-  MakeApiCall(kFindEligibleUnlockDevicesPath, request, callback,
-              error_callback);
-}
-
-void CryptAuthClient::SendDeviceSyncTickle(
-    const cryptauth::SendDeviceSyncTickleRequest& request,
-    const SendDeviceSyncTickleCallback& callback,
-    const ErrorCallback& error_callback) {
-  MakeApiCall(kSendDeviceSyncTicklePath, request, callback, error_callback);
-}
-
-void CryptAuthClient::ToggleEasyUnlock(
-    const cryptauth::ToggleEasyUnlockRequest& request,
-    const ToggleEasyUnlockCallback& callback,
-    const ErrorCallback& error_callback) {
-  MakeApiCall(kToggleEasyUnlockPath, request, callback, error_callback);
-}
-
-void CryptAuthClient::SetupEnrollment(
-    const cryptauth::SetupEnrollmentRequest& request,
-    const SetupEnrollmentCallback& callback,
-    const ErrorCallback& error_callback) {
-  MakeApiCall(kSetupEnrollmentPath, request, callback, error_callback);
-}
-
-void CryptAuthClient::FinishEnrollment(
-    const cryptauth::FinishEnrollmentRequest& request,
-    const FinishEnrollmentCallback& callback,
-    const ErrorCallback& error_callback) {
-  MakeApiCall(kFinishEnrollmentPath, request, callback, error_callback);
-}
-
-scoped_ptr<CryptAuthApiCallFlow> CryptAuthClient::CreateFlow(
-    const GURL& request_url) {
-  return make_scoped_ptr(new CryptAuthApiCallFlow(request_url));
-}
-
-template <class RequestProto, class ResponseProto>
-void CryptAuthClient::MakeApiCall(
-    const std::string& request_path,
-    const RequestProto& request_proto,
-    const base::Callback<void(const ResponseProto&)>& response_callback,
-    const ErrorCallback& error_callback) {
-  if (flow_) {
-    error_callback.Run(
-        "Client has been used for another request. Do not reuse.");
-    return;
-  }
-
-  // The |device_classifier| field must be present for all CryptAuth requests.
-  RequestProto request_copy(request_proto);
-  request_copy.mutable_device_classifier()->CopyFrom(device_classifier_);
-
-  std::string serialized_request;
-  if (!request_copy.SerializeToString(&serialized_request)) {
-    error_callback.Run(std::string("Failed to serialize ") +
-                       request_proto.GetTypeName() + " proto.");
-    return;
-  }
-
-  request_path_ = request_path;
-  error_callback_ = error_callback;
-  access_token_fetcher_->FetchAccessToken(base::Bind(
-      &CryptAuthClient::OnAccessTokenFetched<ResponseProto>,
-      weak_ptr_factory_.GetWeakPtr(), serialized_request, response_callback));
-}
-
-template <class ResponseProto>
-void CryptAuthClient::OnAccessTokenFetched(
-    const std::string& serialized_request,
-    const base::Callback<void(const ResponseProto&)>& response_callback,
-    const std::string& access_token) {
-  if (access_token.empty()) {
-    OnApiCallFailed("Failed to get a valid access token.");
-    return;
-  }
-
-  flow_ = CreateFlow(CreateRequestUrl(request_path_));
-  flow_->Start(url_request_context_.get(), access_token, serialized_request,
-               base::Bind(&CryptAuthClient::OnFlowSuccess<ResponseProto>,
-                          weak_ptr_factory_.GetWeakPtr(), response_callback),
-               base::Bind(&CryptAuthClient::OnApiCallFailed,
-                          weak_ptr_factory_.GetWeakPtr()));
-}
-
-template <class ResponseProto>
-void CryptAuthClient::OnFlowSuccess(
-    const base::Callback<void(const ResponseProto&)>& result_callback,
-    const std::string& serialized_response) {
-  ResponseProto response;
-  if (!response.ParseFromString(serialized_response)) {
-    OnApiCallFailed("Failed to parse response proto.");
-    return;
-  }
-  result_callback.Run(response);
-};
-
-void CryptAuthClient::OnApiCallFailed(const std::string& error_message) {
-  error_callback_.Run(error_message);
-}
-
-}  // proximity_auth