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// Copyright (c) 2012 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 "chrome/browser/extensions/script_executor.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/pickle.h"
#include "chrome/browser/extensions/active_script_controller.h"
#include "chrome/browser/extensions/tab_helper.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/extension_messages.h"
#include "ipc/ipc_message.h"
#include "ipc/ipc_message_macros.h"
namespace base {
class ListValue;
} // namespace base
namespace extensions {
namespace {
const char* kRendererDestroyed = "The tab was closed.";
// A handler for a single injection request. On creation this will send the
// injection request to the renderer, and it will be destroyed after either the
// corresponding response comes from the renderer, or the renderer is destroyed.
class Handler : public content::WebContentsObserver {
public:
Handler(ObserverList<TabHelper::ScriptExecutionObserver>* script_observers,
content::WebContents* web_contents,
const ExtensionMsg_ExecuteCode_Params& params,
const ScriptExecutor::ExecuteScriptCallback& callback)
: content::WebContentsObserver(web_contents),
script_observers_(AsWeakPtr(script_observers)),
extension_id_(params.extension_id),
request_id_(params.request_id),
callback_(callback) {
content::RenderViewHost* rvh = web_contents->GetRenderViewHost();
rvh->Send(new ExtensionMsg_ExecuteCode(rvh->GetRoutingID(), params));
}
virtual ~Handler() {}
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
// Unpack by hand to check the request_id, since there may be multiple
// requests in flight but only one is for this.
if (message.type() != ExtensionHostMsg_ExecuteCodeFinished::ID)
return false;
int message_request_id;
PickleIterator iter(message);
CHECK(message.ReadInt(&iter, &message_request_id));
if (message_request_id != request_id_)
return false;
IPC_BEGIN_MESSAGE_MAP(Handler, message)
IPC_MESSAGE_HANDLER(ExtensionHostMsg_ExecuteCodeFinished,
OnExecuteCodeFinished)
IPC_END_MESSAGE_MAP()
return true;
}
virtual void WebContentsDestroyed() OVERRIDE {
base::ListValue val;
callback_.Run(kRendererDestroyed, -1, GURL(std::string()), val);
delete this;
}
private:
void OnExecuteCodeFinished(int request_id,
const std::string& error,
int32 on_page_id,
const GURL& on_url,
const base::ListValue& script_result) {
if (script_observers_.get() && error.empty()) {
TabHelper::ScriptExecutionObserver::ExecutingScriptsMap id_map;
id_map[extension_id_] = std::set<std::string>();
FOR_EACH_OBSERVER(TabHelper::ScriptExecutionObserver, *script_observers_,
OnScriptsExecuted(web_contents(),
id_map,
on_page_id,
on_url));
}
callback_.Run(error, on_page_id, on_url, script_result);
delete this;
}
base::WeakPtr<ObserverList<TabHelper::ScriptExecutionObserver> >
script_observers_;
std::string extension_id_;
int request_id_;
ScriptExecutor::ExecuteScriptCallback callback_;
};
} // namespace
ScriptExecutor::ScriptExecutor(
content::WebContents* web_contents,
ObserverList<TabHelper::ScriptExecutionObserver>* script_observers)
: next_request_id_(0),
web_contents_(web_contents),
script_observers_(script_observers) {
CHECK(web_contents_);
}
ScriptExecutor::~ScriptExecutor() {}
void ScriptExecutor::ExecuteScript(const std::string& extension_id,
ScriptExecutor::ScriptType script_type,
const std::string& code,
ScriptExecutor::FrameScope frame_scope,
ScriptExecutor::MatchAboutBlank about_blank,
UserScript::RunLocation run_at,
ScriptExecutor::WorldType world_type,
ScriptExecutor::ProcessType process_type,
const GURL& webview_src,
const GURL& file_url,
bool user_gesture,
ScriptExecutor::ResultType result_type,
const ExecuteScriptCallback& callback) {
// Don't execute if the extension has been unloaded.
const Extension* extension =
ExtensionRegistry::Get(web_contents_->GetBrowserContext())
->enabled_extensions().GetByID(extension_id);
if (!extension)
return;
// Don't execute if there's no visible entry. If this is the case, then our
// permissions checking is useless (because we can't evaluate the URL).
// TODO(rdevlin.cronin): This might be better somewhere higher up the
// callstack, but we know it's caught here.
content::NavigationEntry* visible_entry =
web_contents_->GetController().GetVisibleEntry();
if (!visible_entry)
return;
scoped_ptr<ExtensionMsg_ExecuteCode_Params> params(
new ExtensionMsg_ExecuteCode_Params());
params->request_id = next_request_id_++;
params->extension_id = extension_id;
params->is_javascript = (script_type == JAVASCRIPT);
params->code = code;
params->all_frames = (frame_scope == ALL_FRAMES);
params->match_about_blank = (about_blank == MATCH_ABOUT_BLANK);
params->run_at = static_cast<int>(run_at);
params->in_main_world = (world_type == MAIN_WORLD);
params->is_web_view = (process_type == WEB_VIEW_PROCESS);
params->webview_src = webview_src;
params->file_url = file_url;
params->wants_result = (result_type == JSON_SERIALIZED_RESULT);
params->user_gesture = user_gesture;
ActiveScriptController* active_script_controller =
ActiveScriptController::GetForWebContents(web_contents_);
if (active_script_controller &&
active_script_controller->RequiresUserConsentForScriptInjection(
extension)) {
// The base::Unretained(this) is safe, because this and the
// ActiveScriptController are both attached to the TabHelper. Thus, if the
// ActiveScriptController is still alive to invoke the callback, this is
// alive, too.
active_script_controller->RequestScriptInjection(
extension,
visible_entry->GetPageID(),
base::Closure(base::Bind(&ScriptExecutor::ExecuteScriptHelper,
base::Unretained(this),
base::Passed(params.Pass()),
callback)));
} else {
ExecuteScriptHelper(params.Pass(), callback);
}
}
void ScriptExecutor::ExecuteScriptHelper(
scoped_ptr<ExtensionMsg_ExecuteCode_Params> params,
const ExecuteScriptCallback& callback) {
// Handler handles IPCs and deletes itself on completion.
new Handler(script_observers_, web_contents_, *params, callback);
}
} // namespace extensions
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