Adding the Copresence RpcHandler and HttpPost helper.

components/copresence/rpc/rpc_handler.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 "components/copresence/rpc/rpc_handler.h"
 
+#include <map>
+
 #include "base/bind.h"
+#include "base/command_line.h"
+#include "base/guid.h"
+#include "base/logging.h"
+#include "base/strings/string_util.h"
+#include "base/time/time.h"
+#include "components/copresence/copresence_switches.h"
+#include "components/copresence/handlers/directive_handler.h"
+#include "components/copresence/proto/codes.pb.h"
 #include "components/copresence/proto/data.pb.h"
 #include "components/copresence/proto/rpcs.pb.h"
 #include "components/copresence/public/copresence_client_delegate.h"
-#include "components/copresence/public/whispernet_client.h"
+#include "net/http/http_status_code.h"
+
+// TODO(ckehoe): Return error messages for bad requests.
 
 namespace copresence {
 
-RpcHandler::RpcHandler(CopresenceClientDelegate* delegate,
-                       SuccessCallback init_done_callback) {
-}
-
-RpcHandler::~RpcHandler() {
-}
-
-void RpcHandler::SendReportRequest(
-    scoped_ptr<copresence::ReportRequest> request) {
-}
-
-void RpcHandler::SendReportRequest(
-    scoped_ptr<copresence::ReportRequest> request,
+using google::protobuf::MessageLite;
+using google::protobuf::RepeatedPtrField;
+
+const char RpcHandler::kReportRequestRpcName[] = "report";
+
+namespace {
+
+// UrlSafe is defined as:
+// '/' represented by a '_' and '+' represented by a '-'
+// TODO(rkc): Move this to the wrapper.
+std::string ToUrlSafe(std::string token) {
+  base::ReplaceChars(token, "+", "-", &token);
+  base::ReplaceChars(token, "/", "_", &token);
+  return token;
+}
+
+const int kInvalidTokenExpiryTimeMs = 10 * 60 * 1000;  // 10 minutes.
+const int kMaxInvalidTokens = 10000;
+const char kRegisterDeviceRpcName[] = "registerdevice";
+const char kDefaultCopresenceServer[] =
+    "https://www.googleapis.com/copresence/v2/copresence";
+
+// Logging
+
+// Checks for a copresence error. If there is one, logs it and returns true.
+bool CopresenceErrorLogged(const Status& status) {
+  if (status.code() != OK) {
+    LOG(ERROR) << "Copresence error code " << status.code()
+               << (status.message().empty() ? std::string() :
+                  ": " + status.message());
+  }
+  return status.code() != OK;
+}
+
+void LogIfErrorStatus(const util::error::Code& code,
+                      const std::string& context) {
+  LOG_IF(ERROR, code != util::error::OK)
+      << context << " error " << code << ". See "
+      << "cs/google3/util/task/codes.proto for more info.";
+}
+
+// If any errors occurred, logs them and returns true.
+bool ReportErrorLogged(const ReportResponse& response) {
+  bool result = CopresenceErrorLogged(response.header().status());
+
+  // The Report fails or succeeds as a unit. If any responses had errors,
+  // the header will too. Thus we don't need to propagate individual errors.
+  if (response.has_update_signals_response())
+    LogIfErrorStatus(response.update_signals_response().status(), "Update");
+  if (response.has_manage_messages_response())
+    LogIfErrorStatus(response.manage_messages_response().status(), "Publish");
+  if (response.has_manage_subscriptions_response()) {
+    LogIfErrorStatus(response.manage_subscriptions_response().status(),
+                     "Subscribe");
+  }
+
+  return result;
+}
+
+// Request construction
+
+template <typename T>
+BroadcastScanConfiguration GetBroadcastScanConfig(const T& msg) {
+  if (msg.has_token_exchange_strategy() &&
+      msg.token_exchange_strategy().has_broadcast_scan_configuration()) {
+    return msg.token_exchange_strategy().broadcast_scan_configuration();
+  }
+  return BROADCAST_SCAN_CONFIGURATION_UNKNOWN;
+}
+
+// This method will extract token exchange strategies
+// from the publishes and subscribes in a report request.
+// TODO(ckehoe): Delete this when the server supports
+// BroadcastScanConfiguration.
+BroadcastScanConfiguration ExtractTokenExchangeStrategy(
+    const ReportRequest& request) {
+  bool broadcast_only = false;
+  bool scan_only = false;
+
+  // Strategies for publishes.
+  if (request.has_manage_messages_request()) {
+    const RepeatedPtrField<PublishedMessage> messages =
+        request.manage_messages_request().message_to_publish();
+    for (int i = 0; i < messages.size(); ++i) {
+      BroadcastScanConfiguration config =
+          GetBroadcastScanConfig(messages.Get(i));
+      broadcast_only = broadcast_only || config == BROADCAST_ONLY;
+      scan_only = scan_only || config == SCAN_ONLY;
+      if (config == BROADCAST_AND_SCAN || (broadcast_only && scan_only))
+        return BROADCAST_AND_SCAN;
+    }
+  }
+
+  // Strategies for subscriptions.
+  if (request.has_manage_subscriptions_request()) {
+    const RepeatedPtrField<Subscription> messages =
+        request.manage_subscriptions_request().subscription();
+    for (int i = 0; i < messages.size(); ++i) {
+      BroadcastScanConfiguration config =
+          GetBroadcastScanConfig(messages.Get(i));
+      broadcast_only = broadcast_only || config == BROADCAST_ONLY;
+      scan_only = scan_only || config == SCAN_ONLY;
+      if (config == BROADCAST_AND_SCAN || (broadcast_only && scan_only))
+        return BROADCAST_AND_SCAN;
+    }
+  }
+
+  if (broadcast_only)
+    return BROADCAST_ONLY;
+  if (scan_only)
+    return SCAN_ONLY;
+
+  // If nothing else is specified, default to both broadcast and scan.
+  return BROADCAST_AND_SCAN;
+}
+
+scoped_ptr<DeviceState> GetDeviceCapabilities(const ReportRequest& request) {
+  scoped_ptr<DeviceState> state(new DeviceState);
+
+  TokenTechnology* token_technology =
+      state->mutable_capabilities()->add_token_technology();
+  token_technology->set_medium(AUDIO_ULTRASOUND_PASSBAND);
+
+  BroadcastScanConfiguration config =
+      ExtractTokenExchangeStrategy(request);
+  if (config == BROADCAST_ONLY || config == BROADCAST_AND_SCAN)
+    token_technology->add_instruction_type(TRANSMIT);
+  if (config == SCAN_ONLY || config == BROADCAST_AND_SCAN)
+    token_technology->add_instruction_type(RECEIVE);
+
+  return state.Pass();
+}
+
+// TODO(ckehoe): We're keeping this code in a separate function for now
+// because we get a version string from Chrome, but the proto expects
+// an int64 version. We should probably change the version proto
+// to handle a more detailed version.
+ClientVersion* CreateVersion(const std::string& client,
+                             const std::string& version_name) {
+  ClientVersion* version = new ClientVersion;
+
+  version->set_client(client);
+  version->set_version_name(version_name);
+
+  return version;
+}
+
+// Wrapper for the http post constructor. This is the default way
+// to contact the server, but it can be overridden for testing.
+void SendHttpPost(net::URLRequestContextGetter* url_context_getter,
+                  const std::string& rpc_name,
+                  scoped_ptr<MessageLite> request_proto,
+                  const HttpPost::ResponseCallback& callback) {
+  // Create the base URL to call.
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  const std::string copresence_server_host =
+      command_line->HasSwitch(switches::kCopresenceServer) ?
+      command_line->GetSwitchValueASCII(switches::kCopresenceServer) :
+      kDefaultCopresenceServer;
+
+  new HttpPost(url_context_getter,
+               copresence_server_host,
+               rpc_name,
+               *request_proto,
+               callback);
+}
+
+}  // namespace
+
+// Public methods
+
+RpcHandler::RpcHandler(CopresenceClientDelegate* delegate)
+    : delegate_(delegate),
+      invalid_audio_token_cache_(
+          base::TimeDelta::FromMilliseconds(kInvalidTokenExpiryTimeMs),
+          kMaxInvalidTokens),
+      server_post_callback_(base::Bind(&SendHttpPost)) {
+}
+
+RpcHandler::~RpcHandler() {}
+
+void RpcHandler::Initialize(const SuccessCallback& init_done_callback) {
+  scoped_ptr<RegisterDeviceRequest> request(new RegisterDeviceRequest);
+  DCHECK(device_id_.empty());
+  device_id_ = delegate_->GetDeviceId();
+  if (!device_id_.empty()) {
+    init_done_callback.Run(true);
+    return;
+  }
+
+  request->mutable_push_service()->set_service(PUSH_SERVICE_NONE);
+  Identity* identity =
+      request->mutable_device_identifiers()->mutable_registrant();
+  identity->set_type(CHROME);
+  identity->set_chrome_id(base::GenerateGUID());
+  SendServerRequest(
+      kRegisterDeviceRpcName,
+      std::string(),
+      request.Pass(),
+      base::Bind(&RpcHandler::RegisterResponseHandler,
+                 AsWeakPtr(),
+                 init_done_callback));
+}
+
+void RpcHandler::SendReportRequest(scoped_ptr<ReportRequest> request) {
+  SendReportRequest(request.Pass(), std::string(), StatusCallback());
+}
+
+void RpcHandler::SendReportRequest(scoped_ptr<ReportRequest> request,
+                                   const std::string& app_id,
+                                   const StatusCallback& status_callback) {
+  DCHECK(request.get());
+  DCHECK(!device_id_.empty())
+      << "RpcHandler::Initialize() must complete successfully "
+      << "before other RpcHandler methods are called.";
+
+  DVLOG(3) << "Sending report request to server.";
+
+  request->mutable_update_signals_request()->set_allocated_state(
+      GetDeviceCapabilities(*request).release());
+  SendServerRequest(
+      kReportRequestRpcName,
+      app_id,
+      request.Pass(),
+      base::Bind(
+          &RpcHandler::ReportResponseHandler, AsWeakPtr(), status_callback));
+}
+
+void RpcHandler::ReportTokens(TokenMedium medium,
+                              const std::vector<std::string>& tokens) {
+  DCHECK_EQ(medium, AUDIO_ULTRASOUND_PASSBAND);
+  DCHECK(!tokens.empty());
+
+  scoped_ptr<ReportRequest> request(new ReportRequest);
+  for (size_t i = 0; i < tokens.size(); ++i) {
+    const std::string& token = ToUrlSafe(tokens[i]);
+    if (invalid_audio_token_cache_.HasKey(token))
+      continue;
+
+    DVLOG(3) << "Sending token " << token << " to server.";
+
+    TokenObservation* token_observation =
+        request->mutable_update_signals_request()->add_token_observation();
+    token_observation->set_token_id(token);
+
+    TokenSignals* signals = token_observation->add_signals();
+    signals->set_medium(medium);
+    signals->set_observed_time_millis(base::Time::Now().ToJsTime());
+  }
+  SendReportRequest(request.Pass());
+}
+
+void RpcHandler::ConnectToWhispernet() {
+  WhispernetClient* whispernet_client = delegate_->GetWhispernetClient();
+
+  // |directive_handler_| will be destructed before us, so unretained is safe.
+  directive_handler_.reset(new DirectiveHandler);
+  directive_handler_->Initialize(
+      base::Bind(&WhispernetClient::DecodeSamples,
+                 base::Unretained(whispernet_client)),
+      base::Bind(&RpcHandler::AudioDirectiveListToWhispernetConnector,
+                 base::Unretained(this)));
+
+  whispernet_client->RegisterTokensCallback(
+      base::Bind(&RpcHandler::ReportTokens,
+                 AsWeakPtr(),
+                 AUDIO_ULTRASOUND_PASSBAND));
+}
+
+void RpcHandler::DisconnectFromWhispernet() {
+  directive_handler_.reset();
+}
+
+// Private methods
+
+void RpcHandler::RegisterResponseHandler(
+    const SuccessCallback& init_done_callback,
+    int http_status_code,
+    const std::string& response_data) {
+  if (http_status_code != net::HTTP_OK) {
+    init_done_callback.Run(false);
+    return;
+  }
+
+  RegisterDeviceResponse response;
+  if (!response.ParseFromString(response_data)) {
+    LOG(ERROR) << "Invalid RegisterDeviceResponse:\n" << response_data;
+    init_done_callback.Run(false);
+    return;
+  }
+
+  if (CopresenceErrorLogged(response.header().status()))
+    return;
+  device_id_ = response.registered_device_id();
+  DCHECK(!device_id_.empty());
+  DVLOG(2) << "Device registration successful: id " << device_id_;
+  delegate_->SaveDeviceId(device_id_);
+  init_done_callback.Run(true);
+}
+
+void RpcHandler::ReportResponseHandler(const StatusCallback& status_callback,
+                                       int http_status_code,
+                                       const std::string& response_data) {
+  if (http_status_code != net::HTTP_OK) {
+    if (!status_callback.is_null())
+      status_callback.Run(FAIL);
+    return;
+  }
+
+  DVLOG(3) << "Received ReportResponse.";
+  ReportResponse response;
+  if (!response.ParseFromString(response_data)) {
+    LOG(ERROR) << "Invalid ReportResponse";
+    if (!status_callback.is_null())
+      status_callback.Run(FAIL);
+    return;
+  }
+
+  if (ReportErrorLogged(response)) {
+    if (!status_callback.is_null())
+      status_callback.Run(FAIL);
+    return;
+  }
+
+  const RepeatedPtrField<MessageResult>& message_results =
+      response.manage_messages_response().published_message_result();
+  for (int i = 0; i < message_results.size(); ++i) {
+    DVLOG(2) << "Published message with id "
+             << message_results.Get(i).published_message_id();
+  }
+
+  const RepeatedPtrField<SubscriptionResult>& subscription_results =
+      response.manage_subscriptions_response().subscription_result();
+  for (int i = 0; i < subscription_results.size(); ++i) {
+    DVLOG(2) << "Created subscription with id "
+             << subscription_results.Get(i).subscription_id();
+  }
+
+  if (response.has_update_signals_response()) {
+    const UpdateSignalsResponse& update_response =
+        response.update_signals_response();
+    DispatchMessages(update_response.message());
+
+    if (directive_handler_.get()) {
+      for (int i = 0; i < update_response.directive_size(); ++i)
+        directive_handler_->AddDirective(update_response.directive(i));
+    } else {
+      DVLOG(1) << "No directive handler.";
+    }
+
+    const RepeatedPtrField<Token>& tokens = update_response.token();
+    for (int i = 0; i < tokens.size(); ++i) {
+      switch (tokens.Get(i).status()) {
+        case VALID:
+          // TODO(rkc/ckehoe): Store the token in a |valid_token_cache_| with a
+          // short TTL (like 10s) and send it up with every report request.
+          // Then we'll still get messages while we're waiting to hear it again.
+          VLOG(1) << "Got valid token " << tokens.Get(i).id();
+          break;
+        case INVALID:
+          DVLOG(3) << "Discarding invalid token " << tokens.Get(i).id();
+          invalid_audio_token_cache_.Add(tokens.Get(i).id(), true);
+          break;
+        default:
+          DVLOG(2) << "Token " << tokens.Get(i).id() << " has status code "
+                   << tokens.Get(i).status();
+      }
+    }
+  }
+
+  // TODO(ckehoe): Return a more detailed status response.
+  if (!status_callback.is_null())
+    status_callback.Run(SUCCESS);
+}
+
+void RpcHandler::DispatchMessages(
+    const RepeatedPtrField<SubscribedMessage>& messages) {
+  if (messages.size() == 0)
+    return;
+
+  // Index the messages by subscription id.
+  std::map<std::string, std::vector<Message> > messages_by_subscription;
+  DVLOG(3) << "Dispatching " << messages.size() << " messages";
+  for (int m = 0; m < messages.size(); ++m) {
+    const RepeatedPtrField<std::string>& subscription_ids =
+        messages.Get(m).subscription_id();
+    for (int s = 0; s < subscription_ids.size(); ++s) {
+      messages_by_subscription[subscription_ids.Get(s)].push_back(
+          messages.Get(m).published_message());
+    }
+  }
+
+  // Send the messages for each subscription.
+  for (std::map<std::string, std::vector<Message> >::const_iterator
+           subscription = messages_by_subscription.begin();
+       subscription != messages_by_subscription.end();
+       ++subscription) {
+    // TODO(ckehoe): Once we have the app ID from the server, we need to pass
+    // it in here and get rid of the app id registry from the main API class.
+    delegate_->HandleMessages("", subscription->first, subscription->second);
+  }
+}
+
+RequestHeader* RpcHandler::CreateRequestHeader(
+    const std::string& client_name) const {
+  RequestHeader* header = new RequestHeader;
+
+  header->set_allocated_framework_version(
+      CreateVersion("Chrome", delegate_->GetPlatformVersionString()));
+  if (!client_name.empty()) {
+    header->set_allocated_client_version(
+        CreateVersion(client_name, std::string()));
+  }
+  header->set_current_time_millis(base::Time::Now().ToJsTime());
+  header->set_registered_device_id(device_id_);
+
+  return header;
+}
+
+template <class T>
+void RpcHandler::SendServerRequest(
+    const std::string& rpc_name,
     const std::string& app_id,
-    const StatusCallback& status_callback) {
-}
-
-void RpcHandler::ReportTokens(copresence::TokenMedium medium,
-                              const std::vector<std::string>& tokens) {
-}
-
-void RpcHandler::ConnectToWhispernet(WhispernetClient* whispernet_client) {
-}
-
-void RpcHandler::DisconnectFromWhispernet() {
+    scoped_ptr<T> request,
+    const HttpPost::ResponseCallback& response_handler) {
+  request->set_allocated_header(CreateRequestHeader(app_id));
+  server_post_callback_.Run(delegate_->GetRequestContext(),
+                            rpc_name,
+                            make_scoped_ptr<MessageLite>(request.release()),
+                            response_handler);
+}
+
+void RpcHandler::AudioDirectiveListToWhispernetConnector(
+    const std::string& token,
+    const WhispernetClient::SamplesCallback& samples_callback) {
+  WhispernetClient* whispernet_client = delegate_->GetWhispernetClient();
+  if (whispernet_client) {
+    whispernet_client->RegisterSamplesCallback(samples_callback);
+    whispernet_client->EncodeToken(token);
+  }
 }
 
 }  // namespace copresence