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 // static
  29 std::string DevToolsProtocol::SerializeCommand(
  30     int command_id,
  31     const std::string& method,
  32     scoped_ptr<base::DictionaryValue> params) {
  33   base::DictionaryValue command;
  34   command.SetInteger(kIdParam, command_id);
  35   command.SetString(kMethodParam, method);
  36   if (params)
  37     command.Set(kParamsParam, params.release());
  38
  39   std::string json_command;
  40   base::JSONWriter::Write(command, &json_command);
  41   return json_command;
  42 }
  43
  44 // static
  45 scoped_ptr<base::DictionaryValue>
  46 DevToolsProtocol::CreateInvalidParamsResponse(int command_id,
  47                                               const std::string& param) {
  48   scoped_ptr<base::DictionaryValue> response(new base::DictionaryValue());
  49   base::DictionaryValue* error_object = new base::DictionaryValue();
  50   response->Set(kErrorParam, error_object);
  51   error_object->SetInteger(kErrorCodeParam, kErrorInvalidParams);
  52   error_object->SetString(kErrorMessageParam,
  53       base::StringPrintf("Missing or invalid '%s' parameter", param.c_str()));
  54
  55   return response.Pass();
  56 }
  57
  58 // static
  59 scoped_ptr<base::DictionaryValue>
  60 DevToolsProtocol::CreateSuccessResponse(
  61     int command_id,
  62     scoped_ptr<base::DictionaryValue> result) {
  63   scoped_ptr<base::DictionaryValue> response(new base::DictionaryValue());
  64   response->SetInteger(kIdParam, command_id);
  65   response->Set(kResultParam,
  66                 result ? result.release() : new base::DictionaryValue());
  67
  68   return response.Pass();
  69 }
  70
  71 // static
  72 bool DevToolsProtocol::ParseCommand(const base::DictionaryValue* command,
  73                                     int* command_id,
  74                                     std::string* method,
  75                                     const base::DictionaryValue** params) {
  76   if (!command)
  77     return false;
  78
  79   if (!command->GetInteger(kIdParam, command_id) || *command_id < 0)
  80     return false;
  81
  82   if (!command->GetString(kMethodParam, method))
  83     return false;
  84
  85   if (!command->GetDictionary(kParamsParam, params))
  86     *params = nullptr;
  87
  88   return true;
  89 }
  90
  91 // static
  92 bool DevToolsProtocol::ParseNotification(
  93     const std::string& json,
  94     std::string* method,
  95     scoped_ptr<base::DictionaryValue>* params) {
  96   scoped_ptr<base::Value> value = base::JSONReader::Read(json);
  97   if (!value || !value->IsType(base::Value::TYPE_DICTIONARY))
  98     return false;
  99
 100   scoped_ptr<base::DictionaryValue> dict(
 101       static_cast<base::DictionaryValue*>(value.release()));
 102
 103   if (!dict->GetString(kMethodParam, method))
 104     return false;
 105
 106   scoped_ptr<base::Value> params_value;
 107   dict->Remove(kParamsParam, &params_value);
 108   if (params_value && params_value->IsType(base::Value::TYPE_DICTIONARY))
 109     params->reset(static_cast<base::DictionaryValue*>(params_value.release()));
 110
 111   return true;
 112 }
 113
 114 // static
 115 bool DevToolsProtocol::ParseResponse(const std::string& json,
 116                                      int* command_id,
 117                                      int* error_code) {
 118   scoped_ptr<base::Value> value = base::JSONReader::Read(json);
 119   if (!value || !value->IsType(base::Value::TYPE_DICTIONARY))
 120     return false;
 121
 122   scoped_ptr<base::DictionaryValue> dict(
 123       static_cast<base::DictionaryValue*>(value.release()));
 124
 125   if (!dict->GetInteger(kIdParam, command_id))
 126     return false;
 127
 128   *error_code = 0;
 129   base::DictionaryValue* error_dict = nullptr;
 130   if (dict->GetDictionary(kErrorParam, &error_dict))
 131     error_dict->GetInteger(kErrorCodeParam, error_code);
 132   return true;
 133 }