Introduce CryptAuthClient, a class capable of performing all CryptAuth APIs.

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) {
+  CommandLine* command_line = 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)
+    : url_request_context_(url_request_context),
+      access_token_fetcher_(access_token_fetcher.Pass()),
+      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);
+}
+
+CryptAuthApiCallFlow* CryptAuthClient::CreateFlow(const GURL& request_url) {
+  return 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;
+  }
+
+  std::string serialized_request;
+  if (!request_proto.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_.reset(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("parse error");

[Ilya Sherman, 2014/12/03 03:16:37]

Please add test coverage for this code path.

[Tim Song, 2014/12/05 00:00:36]

Done.

+    return;
+  }
+  result_callback.Run(response);
+};
+
+void CryptAuthClient::OnApiCallFailed(const std::string& error_message) {
+  error_callback_.Run(error_message);
+}
+
+}  // proximity_auth