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// Copyright (c) 2009 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.
// Implements AutomationExtensionFunction.
#include "chrome/browser/automation/automation_extension_function.h"
#include "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "chrome/browser/automation/extension_automation_constants.h"
#include "chrome/browser/extensions/extension_function_dispatcher.h"
#include "chrome/browser/renderer_host/render_view_host.h"
#include "chrome/browser/renderer_host/render_view_host_delegate.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/browser/tab_contents/tab_contents_delegate.h"
TabContents* AutomationExtensionFunction::api_handler_tab_ = NULL;
AutomationExtensionFunction::PendingFunctionsMap
AutomationExtensionFunction::pending_functions_;
void AutomationExtensionFunction::SetArgs(const ListValue* args) {
// Need to JSON-encode for sending over the wire to the automation user.
base::JSONWriter::Write(args, false, &args_);
}
const std::string AutomationExtensionFunction::GetResult() {
// Already JSON-encoded, so override the base class's implementation.
return json_result_;
}
bool AutomationExtensionFunction::RunImpl() {
namespace keys = extension_automation_constants;
DCHECK(api_handler_tab_) <<
"Why is this function still enabled if no target tab?";
if (!api_handler_tab_) {
error_ = "No longer automating functions.";
return false;
}
// We are being driven through automation, so we send the extension API
// request over to the automation host. We do this before decoding the
// 'args' JSON, otherwise we'd be decoding it only to encode it again.
DictionaryValue message_to_host;
message_to_host.SetString(keys::kAutomationNameKey, name_);
message_to_host.SetString(keys::kAutomationArgsKey, args_);
message_to_host.SetInteger(keys::kAutomationRequestIdKey, request_id_);
message_to_host.SetBoolean(keys::kAutomationHasCallbackKey, has_callback_);
std::string message;
base::JSONWriter::Write(&message_to_host, false, &message);
if (api_handler_tab_->delegate()) {
api_handler_tab_->delegate()->ForwardMessageToExternalHost(
message, keys::kAutomationOrigin, keys::kAutomationRequestTarget);
} else {
NOTREACHED() << "ExternalTabContainer is supposed to correctly manage "
"lifetime of api_handler_tab_.";
}
// Automation APIs are asynchronous so we need to stick around until
// our response comes back. Add ourselves to a static hash map keyed
// by request ID. The hash map keeps a reference count on us.
DCHECK(pending_functions_.find(request_id_) == pending_functions_.end());
pending_functions_[request_id_] = this;
return true;
}
ExtensionFunction* AutomationExtensionFunction::Factory() {
return new AutomationExtensionFunction();
}
void AutomationExtensionFunction::Enable(
TabContents* api_handler_tab,
const std::vector<std::string>& functions_enabled) {
DCHECK(api_handler_tab);
if (api_handler_tab_ && api_handler_tab != api_handler_tab_) {
NOTREACHED() << "Don't call with different API handler.";
return;
}
api_handler_tab_ = api_handler_tab;
std::vector<std::string> function_names;
if (functions_enabled.size() == 1 && functions_enabled[0] == "*") {
ExtensionFunctionDispatcher::GetAllFunctionNames(&function_names);
} else {
function_names = functions_enabled;
}
for (std::vector<std::string>::iterator it = function_names.begin();
it != function_names.end(); it++) {
// TODO(joi) Could make this a per-profile change rather than a global
// change. Could e.g. have the AutomationExtensionFunction store the
// profile pointer and dispatch to the original ExtensionFunction when the
// current profile is not that.
bool result = ExtensionFunctionDispatcher::OverrideFunction(
*it, AutomationExtensionFunction::Factory);
LOG_IF(WARNING, !result) << "Failed to override API function: " << *it;
}
}
void AutomationExtensionFunction::Disable() {
api_handler_tab_ = NULL;
ExtensionFunctionDispatcher::ResetFunctions();
}
bool AutomationExtensionFunction::InterceptMessageFromExternalHost(
RenderViewHost* view_host,
const std::string& message,
const std::string& origin,
const std::string& target) {
namespace keys = extension_automation_constants;
// We want only specially-tagged messages passed via the conduit tab.
if (api_handler_tab_ &&
view_host == api_handler_tab_->render_view_host() &&
origin == keys::kAutomationOrigin &&
target == keys::kAutomationResponseTarget) {
// This is an extension API response being sent back via postMessage,
// so redirect it.
scoped_ptr<Value> message_value(base::JSONReader::Read(message, false));
DCHECK(message_value->IsType(Value::TYPE_DICTIONARY));
if (message_value->IsType(Value::TYPE_DICTIONARY)) {
DictionaryValue* message_dict =
reinterpret_cast<DictionaryValue*>(message_value.get());
int request_id = -1;
bool got_value = message_dict->GetInteger(keys::kAutomationRequestIdKey,
&request_id);
DCHECK(got_value);
if (got_value) {
std::string error;
bool success = !message_dict->GetString(keys::kAutomationErrorKey,
&error);
std::string response;
got_value = message_dict->GetString(keys::kAutomationResponseKey,
&response);
DCHECK(!success || got_value);
PendingFunctionsMap::iterator it = pending_functions_.find(request_id);
DCHECK(it != pending_functions_.end());
if (it != pending_functions_.end()) {
scoped_refptr<AutomationExtensionFunction> func = it->second;
pending_functions_.erase(it);
// Our local ref should be the last remaining.
DCHECK(func && func->HasOneRef());
if (func) {
func->json_result_ = response;
func->error_ = error;
func->SendResponse(success);
}
}
return true;
}
}
}
return false;
}
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