src/extensions/browser/api/cast_channel/cast_message_util.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/browser/api/cast_channel/cast_message_util.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/strings/string_number_conversions.h"
  10 #include "base/values.h"
  11 #include "extensions/browser/api/cast_channel/cast_channel.pb.h"
  12 #include "extensions/common/api/cast_channel.h"
  13
  14 namespace {
  15 static const char kAuthNamespace[] =
  16     "urn:x-cast:com.google.cast.tp.deviceauth";
  17 // Sender and receiver IDs to use for platform messages.
  18 static const char kPlatformSenderId[] = "sender-0";
  19 static const char kPlatformReceiverId[] = "receiver-0";
  20 }  // namespace
  21
  22 namespace extensions {
  23 namespace core_api {
  24 namespace cast_channel {
  25
  26 bool MessageInfoToCastMessage(const MessageInfo& message,
  27                               CastMessage* message_proto) {
  28   DCHECK(message_proto);
  29   if (!message.data)
  30     return false;
  31
  32   message_proto->set_protocol_version(CastMessage_ProtocolVersion_CASTV2_1_0);
  33   message_proto->set_source_id(message.source_id);
  34   message_proto->set_destination_id(message.destination_id);
  35   message_proto->set_namespace_(message.namespace_);
  36   // Determine the type of the base::Value and set the message payload
  37   // appropriately.
  38   std::string data;
  39   base::BinaryValue* real_value;
  40   switch (message.data->GetType()) {
  41     // JS string
  42     case base::Value::TYPE_STRING:
  43       if (message.data->GetAsString(&data)) {
  44         message_proto->set_payload_type(CastMessage_PayloadType_STRING);
  45         message_proto->set_payload_utf8(data);
  46       }
  47       break;
  48     // JS ArrayBuffer
  49     case base::Value::TYPE_BINARY:
  50       real_value = static_cast<base::BinaryValue*>(message.data.get());
  51       if (real_value->GetBuffer()) {
  52         message_proto->set_payload_type(CastMessage_PayloadType_BINARY);
  53         message_proto->set_payload_binary(real_value->GetBuffer(),
  54                                           real_value->GetSize());
  55       }
  56       break;
  57     default:
  58       // Unknown value type.  message_proto will remain uninitialized because
  59       // payload_type is unset.
  60       break;
  61   }
  62   return message_proto->IsInitialized();
  63 }
  64
  65 bool CastMessageToMessageInfo(const CastMessage& message_proto,
  66                               MessageInfo* message) {
  67   DCHECK(message);
  68   message->source_id = message_proto.source_id();
  69   message->destination_id = message_proto.destination_id();
  70   message->namespace_ = message_proto.namespace_();
  71   // Determine the type of the payload and fill base::Value appropriately.
  72   scoped_ptr<base::Value> value;
  73   switch (message_proto.payload_type()) {
  74   case CastMessage_PayloadType_STRING:
  75     if (message_proto.has_payload_utf8())
  76       value.reset(new base::StringValue(message_proto.payload_utf8()));
  77     break;
  78   case CastMessage_PayloadType_BINARY:
  79     if (message_proto.has_payload_binary())
  80       value.reset(base::BinaryValue::CreateWithCopiedBuffer(
  81         message_proto.payload_binary().data(),
  82         message_proto.payload_binary().size()));
  83     break;
  84   default:
  85     // Unknown payload type. value will remain unset.
  86     break;
  87   }
  88   if (value.get()) {
  89     DCHECK(!message->data.get());
  90     message->data.reset(value.release());
  91     return true;
  92   } else {
  93     return false;
  94   }
  95 }
  96
  97 std::string CastMessageToString(const CastMessage& message_proto) {
  98   std::string out("{");
  99   out += "namespace = " + message_proto.namespace_();
 100   out += ", sourceId = " + message_proto.source_id();
 101   out += ", destId = " + message_proto.destination_id();
 102   out += ", type = " + base::IntToString(message_proto.payload_type());
 103   out += ", str = \"" + message_proto.payload_utf8() + "\"}";
 104   return out;
 105 }
 106
 107 std::string AuthMessageToString(const DeviceAuthMessage& message) {
 108   std::string out("{");
 109   if (message.has_challenge()) {
 110     out += "challenge: {}, ";
 111   }
 112   if (message.has_response()) {
 113     out += "response: {signature: (";
 114     out += base::UintToString(message.response().signature().length());
 115     out += " bytes), certificate: (";
 116     out += base::UintToString(
 117         message.response().client_auth_certificate().length());
 118     out += " bytes)}";
 119   }
 120   if (message.has_error()) {
 121     out += ", error: {";
 122     out += base::IntToString(message.error().error_type());
 123     out += "}";
 124   }
 125   out += "}";
 126   return out;
 127 }
 128
 129 void CreateAuthChallengeMessage(CastMessage* message_proto) {
 130   CHECK(message_proto);
 131   DeviceAuthMessage auth_message;
 132   auth_message.mutable_challenge();
 133   std::string auth_message_string;
 134   auth_message.SerializeToString(&auth_message_string);
 135
 136   message_proto->set_protocol_version(CastMessage_ProtocolVersion_CASTV2_1_0);
 137   message_proto->set_source_id(kPlatformSenderId);
 138   message_proto->set_destination_id(kPlatformReceiverId);
 139   message_proto->set_namespace_(kAuthNamespace);
 140   message_proto->set_payload_type(CastMessage_PayloadType_BINARY);
 141   message_proto->set_payload_binary(auth_message_string);
 142 }
 143
 144 bool IsAuthMessage(const CastMessage& message) {
 145   return message.namespace_() == kAuthNamespace;
 146 }
 147
 148 }  // namespace cast_channel
 149 }  // namespace core_api
 150 }  // namespace extensions