chrome/browser/devtools/devtools_protocol.cc

   1 // Copyright (c) 2013 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 "chrome/browser/devtools/devtools_protocol.h"
   6
   7 #include "base/json/json_reader.h"
   8 #include "base/json/json_writer.h"
   9 #include "base/strings/stringprintf.h"
  10
  11 namespace {
  12
  13 const char kErrorCodeParam[] = "code";
  14 const char kErrorParam[] = "error";
  15 const char kErrorMessageParam[] = "message";
  16 const char kIdParam[] = "id";
  17 const char kMethodParam[] = "method";
  18 const char kParamsParam[] = "params";
  19 const char kResultParam[] = "result";
  20
  21 // JSON RPC 2.0 spec: http://www.jsonrpc.org/specification#error_object
  22 enum Error {
  23   kErrorInvalidParams = -32602
  24 };
  25
  26 }  // namespace
  27
  28 DevToolsProtocol::Message::~Message() {
  29 }
  30
  31 DevToolsProtocol::Message::Message(const std::string& method,
  32                                    base::DictionaryValue* params)
  33     : method_(method),
  34       params_(params ? params->DeepCopy() : NULL) {
  35 }
  36
  37 DevToolsProtocol::Command::Command(int id,
  38                                    const std::string& method,
  39                                    base::DictionaryValue* params)
  40     : Message(method, params),
  41       id_(id) {
  42 }
  43
  44 DevToolsProtocol::Command::~Command() {
  45 }
  46
  47 std::string DevToolsProtocol::Command::Serialize() {
  48   base::DictionaryValue command;
  49   command.SetInteger(kIdParam, id_);
  50   command.SetString(kMethodParam, method_);
  51   if (params_)
  52     command.Set(kParamsParam, params_->DeepCopy());
  53
  54   std::string json_command;
  55   base::JSONWriter::Write(&command, &json_command);
  56   return json_command;
  57 }
  58
  59 scoped_ptr<DevToolsProtocol::Response>
  60 DevToolsProtocol::Command::SuccessResponse(base::DictionaryValue* result) {
  61   return scoped_ptr<DevToolsProtocol::Response>(
  62       new DevToolsProtocol::Response(id_, result));
  63 }
  64
  65 scoped_ptr<DevToolsProtocol::Response>
  66 DevToolsProtocol::Command::InvalidParamResponse(const std::string& param) {
  67   std::string message =
  68       base::StringPrintf("Missing or invalid '%s' parameter", param.c_str());
  69   return scoped_ptr<DevToolsProtocol::Response>(
  70       new DevToolsProtocol::Response(id_, kErrorInvalidParams, message));
  71 }
  72
  73 DevToolsProtocol::Notification::~Notification() {
  74 }
  75
  76 DevToolsProtocol::Notification::Notification(const std::string& method,
  77                                              base::DictionaryValue* params)
  78     : Message(method, params) {
  79 }
  80
  81 DevToolsProtocol::Response::~Response() {
  82 }
  83
  84 DevToolsProtocol::Response::Response(int id,
  85                                      int error_code,
  86                                      const std::string error_message)
  87     : id_(id),
  88       error_code_(error_code),
  89       error_message_(error_message) {
  90 }
  91
  92 DevToolsProtocol::Response::Response(int id, base::DictionaryValue* result)
  93     : id_(id),
  94       error_code_(0),
  95       result_(result) {
  96 }
  97
  98 base::DictionaryValue* DevToolsProtocol::Response::Serialize() {
  99   base::DictionaryValue* response = new base::DictionaryValue();
 100
 101   response->SetInteger(kIdParam, id_);
 102
 103   if (error_code_) {
 104     base::DictionaryValue* error_object = new base::DictionaryValue();
 105     response->Set(kErrorParam, error_object);
 106     error_object->SetInteger(kErrorCodeParam, error_code_);
 107     if (!error_message_.empty())
 108       error_object->SetString(kErrorMessageParam, error_message_);
 109   } else if (result_) {
 110     response->Set(kResultParam, result_->DeepCopy());
 111   }
 112
 113   return response;
 114 }
 115
 116 // static
 117 DevToolsProtocol::Command* DevToolsProtocol::ParseCommand(
 118     base::DictionaryValue* command_dict) {
 119   if (!command_dict)
 120     return NULL;
 121
 122   int id;
 123   if (!command_dict->GetInteger(kIdParam, &id) || id < 0)
 124     return NULL;
 125
 126   std::string method;
 127   if (!command_dict->GetString(kMethodParam, &method))
 128     return NULL;
 129
 130   base::DictionaryValue* params = NULL;
 131   command_dict->GetDictionary(kParamsParam, &params);
 132   return new Command(id, method, params ? params->DeepCopy() : NULL);
 133 }
 134
 135 // static
 136 DevToolsProtocol::Notification* DevToolsProtocol::ParseNotification(
 137     const std::string& json) {
 138   scoped_ptr<base::Value> value(base::JSONReader::Read(json));
 139   if (!value || !value->IsType(base::Value::TYPE_DICTIONARY))
 140     return NULL;
 141
 142   scoped_ptr<base::DictionaryValue> dict(
 143       static_cast<base::DictionaryValue*>(value.release()));
 144
 145   std::string method;
 146   if (!dict->GetString(kMethodParam, &method))
 147     return NULL;
 148
 149   base::DictionaryValue* params = NULL;
 150   dict->GetDictionary(kParamsParam, &params);
 151   return new Notification(method, params);
 152 }
 153
 154 DevToolsProtocol::Response* DevToolsProtocol::ParseResponse(
 155     const std::string& json) {
 156   scoped_ptr<base::Value> value(base::JSONReader::Read(json));
 157   if (!value || !value->IsType(base::Value::TYPE_DICTIONARY))
 158     return NULL;
 159
 160   scoped_ptr<base::DictionaryValue> dict(
 161       static_cast<base::DictionaryValue*>(value.release()));
 162
 163   int id;
 164   if (!dict->GetInteger(kIdParam, &id))
 165     return NULL;
 166
 167   int error_code = 0;
 168   base::DictionaryValue* error_dict = NULL;
 169   if (dict->GetDictionary(kErrorParam, &error_dict))
 170     error_dict->GetInteger(kErrorCodeParam, &error_code);
 171   return new Response(id, error_code, std::string());
 172 }