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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 "chrome/browser/guest_view/guest_view_manager.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/guest_view/guest_view_base.h"
#include "chrome/browser/guest_view/guest_view_constants.h"
#include "chrome/browser/guest_view/guest_view_manager_factory.h"
#include "chrome/browser/guest_view/web_view/web_view_guest.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/user_metrics.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/common/result_codes.h"
#include "content/public/common/url_constants.h"
#include "extensions/browser/extension_system.h"
#include "net/base/escape.h"
#include "url/gurl.h"
using content::BrowserContext;
using content::SiteInstance;
using content::WebContents;
// static
GuestViewManagerFactory* GuestViewManager::factory_ = NULL;
GuestViewManager::GuestViewManager(content::BrowserContext* context)
: current_instance_id_(0), last_instance_id_removed_(0), context_(context) {
}
GuestViewManager::~GuestViewManager() {}
// static.
GuestViewManager* GuestViewManager::FromBrowserContext(
BrowserContext* context) {
GuestViewManager* guest_manager =
static_cast<GuestViewManager*>(context->GetUserData(
guestview::kGuestViewManagerKeyName));
if (!guest_manager) {
if (factory_) {
guest_manager = factory_->CreateGuestViewManager(context);
} else {
guest_manager = new GuestViewManager(context);
}
context->SetUserData(guestview::kGuestViewManagerKeyName, guest_manager);
}
return guest_manager;
}
content::WebContents* GuestViewManager::GetGuestByInstanceIDSafely(
int guest_instance_id,
int embedder_render_process_id) {
if (!CanEmbedderAccessInstanceIDMaybeKill(embedder_render_process_id,
guest_instance_id)) {
return NULL;
}
return GetGuestByInstanceID(guest_instance_id, embedder_render_process_id);
}
int GuestViewManager::GetNextInstanceID() {
return ++current_instance_id_;
}
void GuestViewManager::CreateGuest(
const std::string& view_type,
const std::string& embedder_extension_id,
int embedder_render_process_id,
const base::DictionaryValue& create_params,
const WebContentsCreatedCallback& callback) {
int guest_instance_id = GetNextInstanceID();
GuestViewBase* guest =
GuestViewBase::Create(context_, guest_instance_id, view_type);
if (!guest) {
callback.Run(NULL);
return;
}
guest->Init(embedder_extension_id,
embedder_render_process_id,
create_params,
callback);
}
content::WebContents* GuestViewManager::CreateGuestWithWebContentsParams(
const std::string& view_type,
const std::string& embedder_extension_id,
int embedder_render_process_id,
const content::WebContents::CreateParams& create_params) {
int guest_instance_id = GetNextInstanceID();
GuestViewBase* guest =
GuestViewBase::Create(context_, guest_instance_id, view_type);
if (!guest)
return NULL;
content::WebContents::CreateParams guest_create_params(create_params);
guest_create_params.guest_delegate = guest;
content::WebContents* guest_web_contents =
WebContents::Create(guest_create_params);
guest->InitWithWebContents(embedder_extension_id,
embedder_render_process_id,
guest_web_contents);
return guest_web_contents;
}
void GuestViewManager::MaybeGetGuestByInstanceIDOrKill(
int guest_instance_id,
int embedder_render_process_id,
const GuestByInstanceIDCallback& callback) {
if (!CanEmbedderAccessInstanceIDMaybeKill(embedder_render_process_id,
guest_instance_id)) {
// If we kill the embedder, then don't bother calling back.
return;
}
content::WebContents* guest_web_contents =
GetGuestByInstanceID(guest_instance_id, embedder_render_process_id);
callback.Run(guest_web_contents);
}
SiteInstance* GuestViewManager::GetGuestSiteInstance(
const GURL& guest_site) {
for (GuestInstanceMap::const_iterator it =
guest_web_contents_by_instance_id_.begin();
it != guest_web_contents_by_instance_id_.end(); ++it) {
if (it->second->GetSiteInstance()->GetSiteURL() == guest_site)
return it->second->GetSiteInstance();
}
return NULL;
}
bool GuestViewManager::ForEachGuest(WebContents* embedder_web_contents,
const GuestCallback& callback) {
for (GuestInstanceMap::iterator it =
guest_web_contents_by_instance_id_.begin();
it != guest_web_contents_by_instance_id_.end(); ++it) {
WebContents* guest = it->second;
GuestViewBase* guest_view = GuestViewBase::FromWebContents(guest);
if (embedder_web_contents != guest_view->embedder_web_contents())
continue;
if (callback.Run(guest))
return true;
}
return false;
}
void GuestViewManager::AddGuest(int guest_instance_id,
WebContents* guest_web_contents) {
CHECK(!ContainsKey(guest_web_contents_by_instance_id_, guest_instance_id));
CHECK(CanUseGuestInstanceID(guest_instance_id));
guest_web_contents_by_instance_id_[guest_instance_id] = guest_web_contents;
}
void GuestViewManager::RemoveGuest(int guest_instance_id) {
GuestInstanceMap::iterator it =
guest_web_contents_by_instance_id_.find(guest_instance_id);
DCHECK(it != guest_web_contents_by_instance_id_.end());
guest_web_contents_by_instance_id_.erase(it);
// All the instance IDs that lie within [0, last_instance_id_removed_]
// are invalid.
// The remaining sparse invalid IDs are kept in |removed_instance_ids_| set.
// The following code compacts the set by incrementing
// |last_instance_id_removed_|.
if (guest_instance_id == last_instance_id_removed_ + 1) {
++last_instance_id_removed_;
// Compact.
std::set<int>::iterator iter = removed_instance_ids_.begin();
while (iter != removed_instance_ids_.end()) {
int instance_id = *iter;
// The sparse invalid IDs must not lie within
// [0, last_instance_id_removed_]
DCHECK(instance_id > last_instance_id_removed_);
if (instance_id != last_instance_id_removed_ + 1)
break;
++last_instance_id_removed_;
removed_instance_ids_.erase(iter++);
}
} else {
removed_instance_ids_.insert(guest_instance_id);
}
}
content::WebContents* GuestViewManager::GetGuestByInstanceID(
int guest_instance_id,
int embedder_render_process_id) {
GuestInstanceMap::const_iterator it =
guest_web_contents_by_instance_id_.find(guest_instance_id);
if (it == guest_web_contents_by_instance_id_.end())
return NULL;
return it->second;
}
bool GuestViewManager::CanEmbedderAccessInstanceIDMaybeKill(
int embedder_render_process_id,
int guest_instance_id) {
if (!CanEmbedderAccessInstanceID(embedder_render_process_id,
guest_instance_id)) {
// The embedder process is trying to access a guest it does not own.
content::RecordAction(
base::UserMetricsAction("BadMessageTerminate_BPGM"));
base::KillProcess(
content::RenderProcessHost::FromID(embedder_render_process_id)->
GetHandle(),
content::RESULT_CODE_KILLED_BAD_MESSAGE, false);
return false;
}
return true;
}
bool GuestViewManager::CanUseGuestInstanceID(int guest_instance_id) {
if (guest_instance_id <= last_instance_id_removed_)
return false;
return !ContainsKey(removed_instance_ids_, guest_instance_id);
}
bool GuestViewManager::CanEmbedderAccessInstanceID(
int embedder_render_process_id,
int guest_instance_id) {
// The embedder is trying to access a guest with a negative or zero
// instance ID.
if (guest_instance_id <= guestview::kInstanceIDNone)
return false;
// The embedder is trying to access an instance ID that has not yet been
// allocated by GuestViewManager. This could cause instance ID
// collisions in the future, and potentially give one embedder access to a
// guest it does not own.
if (guest_instance_id > current_instance_id_)
return false;
// We might get some late arriving messages at tear down. Let's let the
// embedder tear down in peace.
GuestInstanceMap::const_iterator it =
guest_web_contents_by_instance_id_.find(guest_instance_id);
if (it == guest_web_contents_by_instance_id_.end())
return true;
GuestViewBase* guest_view = GuestViewBase::FromWebContents(it->second);
if (!guest_view)
return false;
return embedder_render_process_id == guest_view->embedder_render_process_id();
}
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