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// 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 "content/browser/devtools/devtools_protocol_handler.h"
#include "base/bind.h"
#include "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "content/browser/devtools/devtools_manager.h"
#include "content/public/browser/devtools_manager_delegate.h"
namespace content {
namespace {
const char kIdParam[] = "id";
const char kMethodParam[] = "method";
const char kParamsParam[] = "params";
// JSON RPC 2.0 spec: http://www.jsonrpc.org/specification#error_object
const int kStatusParseError = -32700;
const int kStatusInvalidRequest = -32600;
const int kStatusNoSuchMethod = -32601;
scoped_ptr<base::DictionaryValue> TakeDictionary(base::DictionaryValue* dict,
const std::string& key) {
scoped_ptr<base::Value> value;
dict->Remove(key, &value);
base::DictionaryValue* result = nullptr;
if (value)
value.release()->GetAsDictionary(&result);
return make_scoped_ptr(result);
}
} // namespace
DevToolsProtocolHandler::DevToolsProtocolHandler(
DevToolsAgentHost* agent_host, const Notifier& notifier)
: agent_host_(agent_host),
client_(notifier),
dispatcher_(notifier) {
}
DevToolsProtocolHandler::~DevToolsProtocolHandler() {
}
void DevToolsProtocolHandler::HandleMessage(const std::string& message) {
scoped_ptr<base::DictionaryValue> command = ParseCommand(message);
if (!command)
return;
if (PassCommandToDelegate(command.get()))
return;
HandleCommand(command.Pass());
}
bool DevToolsProtocolHandler::HandleOptionalMessage(
const std::string& message, int* call_id) {
scoped_ptr<base::DictionaryValue> command = ParseCommand(message);
if (!command)
return true;
if (PassCommandToDelegate(command.get()))
return true;
return HandleOptionalCommand(command.Pass(), call_id);
}
bool DevToolsProtocolHandler::PassCommandToDelegate(
base::DictionaryValue* command) {
DevToolsManagerDelegate* delegate =
DevToolsManager::GetInstance()->delegate();
if (!delegate)
return false;
scoped_ptr<base::DictionaryValue> response(
delegate->HandleCommand(agent_host_, command));
if (response) {
std::string json_response;
base::JSONWriter::Write(*response, &json_response);
client_.SendRawMessage(json_response);
return true;
}
return false;
}
scoped_ptr<base::DictionaryValue>
DevToolsProtocolHandler::ParseCommand(const std::string& message) {
scoped_ptr<base::Value> value = base::JSONReader::Read(message);
if (!value || !value->IsType(base::Value::TYPE_DICTIONARY)) {
client_.SendError(DevToolsProtocolClient::kNoId,
Response(kStatusParseError,
"Message must be in JSON format"));
return nullptr;
}
scoped_ptr<base::DictionaryValue> command =
make_scoped_ptr(static_cast<base::DictionaryValue*>(value.release()));
int id = DevToolsProtocolClient::kNoId;
bool ok = command->GetInteger(kIdParam, &id) && id >= 0;
if (!ok) {
client_.SendError(id, Response(kStatusInvalidRequest,
"The type of 'id' property must be number"));
return nullptr;
}
std::string method;
ok = command->GetString(kMethodParam, &method);
if (!ok) {
client_.SendError(id,
Response(kStatusInvalidRequest,
"The type of 'method' property must be string"));
return nullptr;
}
return command;
}
void DevToolsProtocolHandler::HandleCommand(
scoped_ptr<base::DictionaryValue> command) {
int id = DevToolsProtocolClient::kNoId;
std::string method;
command->GetInteger(kIdParam, &id);
command->GetString(kMethodParam, &method);
DevToolsProtocolDispatcher::CommandHandler command_handler(
dispatcher_.FindCommandHandler(method));
if (command_handler.is_null()) {
client_.SendError(id, Response(kStatusNoSuchMethod, "No such method"));
return;
}
bool result =
command_handler.Run(id, TakeDictionary(command.get(), kParamsParam));
DCHECK(result);
}
bool DevToolsProtocolHandler::HandleOptionalCommand(
scoped_ptr<base::DictionaryValue> command, int* call_id) {
*call_id = DevToolsProtocolClient::kNoId;
std::string method;
command->GetInteger(kIdParam, call_id);
command->GetString(kMethodParam, &method);
DevToolsProtocolDispatcher::CommandHandler command_handler(
dispatcher_.FindCommandHandler(method));
if (!command_handler.is_null()) {
return command_handler.Run(
*call_id, TakeDictionary(command.get(), kParamsParam));
}
return false;
}
} // namespace content
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