| // 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/download/download_request_limiter.h" |
| |
| #include "base/bind.h" |
| #include "base/stl_util.h" |
| #include "chrome/browser/api/infobars/infobar_service.h" |
| #include "chrome/browser/download/download_request_infobar_delegate.h" |
| #include "chrome/browser/tab_contents/tab_util.h" |
| #include "chrome/browser/ui/blocked_content/blocked_content_tab_helper.h" |
| #include "chrome/browser/ui/blocked_content/blocked_content_tab_helper_delegate.h" |
| #include "content/public/browser/browser_thread.h" |
| #include "content/public/browser/navigation_controller.h" |
| #include "content/public/browser/navigation_entry.h" |
| #include "content/public/browser/notification_source.h" |
| #include "content/public/browser/notification_types.h" |
| #include "content/public/browser/web_contents.h" |
| #include "content/public/browser/web_contents_delegate.h" |
| |
| using content::BrowserThread; |
| using content::NavigationController; |
| using content::NavigationEntry; |
| using content::WebContents; |
| |
| // TabDownloadState ------------------------------------------------------------ |
| |
| DownloadRequestLimiter::TabDownloadState::TabDownloadState( |
| DownloadRequestLimiter* host, |
| WebContents* contents, |
| WebContents* originating_web_contents) |
| : content::WebContentsObserver(contents), |
| host_(host), |
| status_(DownloadRequestLimiter::ALLOW_ONE_DOWNLOAD), |
| download_count_(0), |
| infobar_(NULL) { |
| content::Source<NavigationController> notification_source( |
| &contents->GetController()); |
| content::Source<content::WebContents> web_contents_source(contents); |
| registrar_.Add(this, content::NOTIFICATION_NAV_ENTRY_PENDING, |
| notification_source); |
| registrar_.Add(this, content::NOTIFICATION_WEB_CONTENTS_DESTROYED, |
| web_contents_source); |
| |
| NavigationEntry* active_entry = originating_web_contents ? |
| originating_web_contents->GetController().GetActiveEntry() : |
| contents->GetController().GetActiveEntry(); |
| if (active_entry) |
| initial_page_host_ = active_entry->GetURL().host(); |
| } |
| |
| DownloadRequestLimiter::TabDownloadState::~TabDownloadState() { |
| // We should only be destroyed after the callbacks have been notified. |
| DCHECK(callbacks_.empty()); |
| |
| // And we should have closed the infobar. |
| DCHECK(!infobar_); |
| } |
| |
| void DownloadRequestLimiter::TabDownloadState::DidGetUserGesture() { |
| if (is_showing_prompt()) { |
| // Don't change the state if the user clicks on the page somewhere. |
| return; |
| } |
| |
| InfoBarService* infobar_service = |
| InfoBarService::FromWebContents(web_contents()); |
| // See PromptUserForDownload(): if there's no InfoBarService, then |
| // DOWNLOADS_NOT_ALLOWED is functionally equivalent to PROMPT_BEFORE_DOWNLOAD. |
| if ((infobar_service && |
| status_ != DownloadRequestLimiter::ALLOW_ALL_DOWNLOADS && |
| status_ != DownloadRequestLimiter::DOWNLOADS_NOT_ALLOWED) || |
| (!infobar_service && |
| status_ != DownloadRequestLimiter::ALLOW_ALL_DOWNLOADS)) { |
| // Revert to default status. |
| host_->Remove(this); |
| // WARNING: We've been deleted. |
| } |
| } |
| |
| void DownloadRequestLimiter::TabDownloadState::PromptUserForDownload( |
| WebContents* web_contents, |
| const DownloadRequestLimiter::Callback& callback) { |
| callbacks_.push_back(callback); |
| |
| if (is_showing_prompt()) |
| return; // Already showing prompt. |
| |
| if (DownloadRequestLimiter::delegate_) { |
| NotifyCallbacks(DownloadRequestLimiter::delegate_->ShouldAllowDownload()); |
| return; |
| } |
| |
| InfoBarService* infobar_service = |
| InfoBarService::FromWebContents(web_contents); |
| if (!infobar_service) { |
| // |web_contents| may not have a InfoBarService if it's actually a |
| // WebContents like those used for extension popups/bubbles and hosted apps |
| // etc. |
| // TODO(benjhayden): If this is an automatic download from an extension, |
| // it would be convenient for the extension author if we send a message to |
| // the extension's DevTools console (as we do for CSP) about how |
| // extensions should use chrome.downloads.download() (requires the |
| // "downloads" permission) to automatically download >1 files. |
| Cancel(); |
| return; |
| } |
| DownloadRequestInfoBarDelegate::Create(infobar_service, this); |
| } |
| |
| void DownloadRequestLimiter::TabDownloadState::Cancel() { |
| NotifyCallbacks(false); |
| } |
| |
| void DownloadRequestLimiter::TabDownloadState::Accept() { |
| NotifyCallbacks(true); |
| } |
| |
| DownloadRequestLimiter::TabDownloadState::TabDownloadState() |
| : host_(NULL), |
| status_(DownloadRequestLimiter::ALLOW_ONE_DOWNLOAD), |
| download_count_(0), |
| infobar_(NULL) { |
| } |
| |
| void DownloadRequestLimiter::TabDownloadState::Observe( |
| int type, |
| const content::NotificationSource& source, |
| const content::NotificationDetails& details) { |
| content::NavigationController* controller = &web_contents()->GetController(); |
| if (type == content::NOTIFICATION_NAV_ENTRY_PENDING) { |
| DCHECK_EQ(controller, content::Source<NavigationController>(source).ptr()); |
| |
| // NOTE: Resetting state on a pending navigate isn't ideal. In particular it |
| // is possible that queued up downloads for the page before the pending |
| // navigation will be delivered to us after we process this request. If this |
| // happens we may let a download through that we shouldn't have. But this is |
| // rather rare, and it is difficult to get 100% right, so we don't deal with |
| // it. |
| NavigationEntry* entry = controller->GetPendingEntry(); |
| if (!entry) |
| return; |
| |
| // Redirects don't count. |
| if (content::PageTransitionIsRedirect(entry->GetTransitionType())) |
| return; |
| |
| if (status_ == DownloadRequestLimiter::ALLOW_ALL_DOWNLOADS || |
| status_ == DownloadRequestLimiter::DOWNLOADS_NOT_ALLOWED) { |
| // User has either allowed all downloads or canceled all downloads. Only |
| // reset the download state if the user is navigating to a different host |
| // (or host is empty). |
| if (!initial_page_host_.empty() && !entry->GetURL().host().empty() && |
| entry->GetURL().host() == initial_page_host_) |
| return; |
| } |
| } else { |
| DCHECK_EQ(content::NOTIFICATION_WEB_CONTENTS_DESTROYED, type); |
| DCHECK_EQ(controller, |
| &content::Source<content::WebContents>(source)->GetController()); |
| // Tab closed, no need to handle closing the dialog as it's owned by the |
| // WebContents. |
| } |
| |
| NotifyCallbacks(false); |
| host_->Remove(this); |
| } |
| |
| void DownloadRequestLimiter::TabDownloadState::NotifyCallbacks(bool allow) { |
| set_download_status(allow ? |
| DownloadRequestLimiter::ALLOW_ALL_DOWNLOADS : |
| DownloadRequestLimiter::DOWNLOADS_NOT_ALLOWED); |
| std::vector<DownloadRequestLimiter::Callback> callbacks; |
| bool change_status = false; |
| |
| // Selectively send first few notifications only if number of downloads exceed |
| // kMaxDownloadsAtOnce. In that case, we also retain the infobar instance and |
| // don't close it. If allow is false, we send all the notifications to cancel |
| // all remaining downloads and close the infobar. |
| if (!allow || (callbacks_.size() < kMaxDownloadsAtOnce)) { |
| if (infobar_) { |
| // Reset the delegate so we don't get notified again. |
| infobar_->set_host(NULL); |
| infobar_ = NULL; |
| } |
| callbacks.swap(callbacks_); |
| } else { |
| std::vector<DownloadRequestLimiter::Callback>::iterator start, end; |
| start = callbacks_.begin(); |
| end = callbacks_.begin() + kMaxDownloadsAtOnce; |
| callbacks.assign(start, end); |
| callbacks_.erase(start, end); |
| change_status = true; |
| } |
| |
| for (size_t i = 0; i < callbacks.size(); ++i) |
| host_->ScheduleNotification(callbacks[i], allow); |
| |
| if (change_status) |
| set_download_status(DownloadRequestLimiter::PROMPT_BEFORE_DOWNLOAD); |
| } |
| |
| // DownloadRequestLimiter ------------------------------------------------------ |
| |
| DownloadRequestLimiter::DownloadRequestLimiter() { |
| } |
| |
| DownloadRequestLimiter::~DownloadRequestLimiter() { |
| // All the tabs should have closed before us, which sends notification and |
| // removes from state_map_. As such, there should be no pending callbacks. |
| DCHECK(state_map_.empty()); |
| } |
| |
| DownloadRequestLimiter::DownloadStatus |
| DownloadRequestLimiter::GetDownloadStatus(WebContents* web_contents) { |
| TabDownloadState* state = GetDownloadState(web_contents, NULL, false); |
| return state ? state->download_status() : ALLOW_ONE_DOWNLOAD; |
| } |
| |
| void DownloadRequestLimiter::CanDownloadOnIOThread( |
| int render_process_host_id, |
| int render_view_id, |
| int request_id, |
| const std::string& request_method, |
| const Callback& callback) { |
| // This is invoked on the IO thread. Schedule the task to run on the UI |
| // thread so that we can query UI state. |
| DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
| BrowserThread::PostTask( |
| BrowserThread::UI, FROM_HERE, |
| base::Bind(&DownloadRequestLimiter::CanDownload, this, |
| render_process_host_id, render_view_id, request_id, |
| request_method, callback)); |
| } |
| |
| // static |
| void DownloadRequestLimiter::SetTestingDelegate(TestingDelegate* delegate) { |
| delegate_ = delegate; |
| } |
| |
| DownloadRequestLimiter::TabDownloadState* |
| DownloadRequestLimiter::GetDownloadState( |
| WebContents* web_contents, |
| WebContents* originating_web_contents, |
| bool create) { |
| DCHECK(web_contents); |
| StateMap::iterator i = state_map_.find(web_contents); |
| if (i != state_map_.end()) |
| return i->second; |
| |
| if (!create) |
| return NULL; |
| |
| TabDownloadState* state = |
| new TabDownloadState(this, web_contents, originating_web_contents); |
| state_map_[web_contents] = state; |
| return state; |
| } |
| |
| void DownloadRequestLimiter::CanDownload(int render_process_host_id, |
| int render_view_id, |
| int request_id, |
| const std::string& request_method, |
| const Callback& callback) { |
| DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); |
| |
| WebContents* originating_contents = |
| tab_util::GetWebContentsByID(render_process_host_id, render_view_id); |
| if (!originating_contents) { |
| // The WebContents was closed, don't allow the download. |
| ScheduleNotification(callback, false); |
| return; |
| } |
| |
| CanDownloadImpl( |
| originating_contents, |
| request_id, |
| request_method, |
| callback); |
| } |
| |
| void DownloadRequestLimiter::CanDownloadImpl(WebContents* originating_contents, |
| int request_id, |
| const std::string& request_method, |
| const Callback& callback) { |
| DCHECK(originating_contents); |
| |
| // FYI: Chrome Frame overrides CanDownload in ExternalTabContainer in order |
| // to cancel the download operation in chrome and let the host browser |
| // take care of it. |
| if (originating_contents->GetDelegate() && |
| !originating_contents->GetDelegate()->CanDownload( |
| originating_contents->GetRenderViewHost(), |
| request_id, |
| request_method)) { |
| ScheduleNotification(callback, false); |
| return; |
| } |
| |
| // If the tab requesting the download is a constrained popup that is not |
| // shown, treat the request as if it came from the parent. |
| WebContents* effective_contents = originating_contents; |
| BlockedContentTabHelper* blocked_content_tab_helper = |
| BlockedContentTabHelper::FromWebContents(originating_contents); |
| if (blocked_content_tab_helper && |
| blocked_content_tab_helper->delegate()) { |
| effective_contents = blocked_content_tab_helper->delegate()-> |
| GetConstrainingWebContents(originating_contents); |
| } |
| |
| TabDownloadState* state = GetDownloadState( |
| effective_contents, originating_contents, true); |
| switch (state->download_status()) { |
| case ALLOW_ALL_DOWNLOADS: |
| if (state->download_count() && !(state->download_count() % |
| DownloadRequestLimiter::kMaxDownloadsAtOnce)) |
| state->set_download_status(PROMPT_BEFORE_DOWNLOAD); |
| ScheduleNotification(callback, true); |
| state->increment_download_count(); |
| break; |
| |
| case ALLOW_ONE_DOWNLOAD: |
| state->set_download_status(PROMPT_BEFORE_DOWNLOAD); |
| ScheduleNotification(callback, true); |
| break; |
| |
| case DOWNLOADS_NOT_ALLOWED: |
| ScheduleNotification(callback, false); |
| break; |
| |
| case PROMPT_BEFORE_DOWNLOAD: |
| state->PromptUserForDownload(effective_contents, callback); |
| state->increment_download_count(); |
| break; |
| |
| default: |
| NOTREACHED(); |
| } |
| } |
| |
| void DownloadRequestLimiter::ScheduleNotification(const Callback& callback, |
| bool allow) { |
| BrowserThread::PostTask( |
| BrowserThread::IO, FROM_HERE, base::Bind(callback, allow)); |
| } |
| |
| void DownloadRequestLimiter::Remove(TabDownloadState* state) { |
| DCHECK(ContainsKey(state_map_, state->web_contents())); |
| state_map_.erase(state->web_contents()); |
| delete state; |
| } |
| |
| // static |
| DownloadRequestLimiter::TestingDelegate* DownloadRequestLimiter::delegate_ = |
| NULL; |