The Tor Browser: dom/quota/CheckQuotaHelper.cpp@6474c204b198 (annotated)

dom/quota/CheckQuotaHelper.cpp@6474c204b198 (annotated)

dom/quota/CheckQuotaHelper.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=2 et sw=2 tw=80: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "CheckQuotaHelper.h"
 #include "nsIDOMWindow.h"
 #include "nsIObserverService.h"
 #include "nsIPermissionManager.h"
 #include "nsIPrincipal.h"
 #include "nsIScriptObjectPrincipal.h"
 #include "nsIURI.h"
 #include "nsPIDOMWindow.h"
 #include "mozilla/dom/quota/QuotaManager.h"
 #include "mozilla/Services.h"
 #include "nsContentUtils.h"
 #include "nsNetUtil.h"
 #include "nsThreadUtils.h"
 #include "nsXULAppAPI.h"
 #define TOPIC_QUOTA_PROMPT "indexedDB-quota-prompt"
 #define TOPIC_QUOTA_RESPONSE "indexedDB-quota-response"
 #define TOPIC_QUOTA_CANCEL "indexedDB-quota-cancel"
 USING_QUOTA_NAMESPACE
 using namespace mozilla::services;
 using mozilla::MutexAutoLock;
 namespace {
 inline
 uint32_t
 GetQuotaPermissionFromWindow(nsIDOMWindow* aWindow)
 {
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   nsCOMPtr<nsIScriptObjectPrincipal> sop(do_QueryInterface(aWindow));
   NS_ENSURE_TRUE(sop, nsIPermissionManager::DENY_ACTION);
   return CheckQuotaHelper::GetQuotaPermission(sop->GetPrincipal());
 }
 } // anonymous namespace
 CheckQuotaHelper::CheckQuotaHelper(nsPIDOMWindow* aWindow,
                                    mozilla::Mutex& aMutex)
 : mWindow(aWindow),
   mMutex(aMutex),
   mCondVar(mMutex, "CheckQuotaHelper::mCondVar"),
   mPromptResult(0),
   mWaiting(true),
   mHasPrompted(false)
 {
   NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
   mMutex.AssertCurrentThreadOwns();
 }
 bool
 CheckQuotaHelper::PromptAndReturnQuotaIsDisabled()
 {
   NS_ASSERTION(!NS_IsMainThread(), "Wrong thread!");
   mMutex.AssertCurrentThreadOwns();
   while (mWaiting) {
     mCondVar.Wait();
   }
   NS_ASSERTION(!mWindow, "This should always be null here!");
   NS_ASSERTION(mPromptResult == nsIPermissionManager::ALLOW_ACTION ||
                mPromptResult == nsIPermissionManager::DENY_ACTION ||
                mPromptResult == nsIPermissionManager::UNKNOWN_ACTION,
                "Unknown permission!");
   return mPromptResult == nsIPermissionManager::ALLOW_ACTION;
 }
 void
 CheckQuotaHelper::Cancel()
 {
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   mMutex.AssertCurrentThreadOwns();
   if (mWaiting && !mHasPrompted) {
     MutexAutoUnlock unlock(mMutex);
     // First close any prompts that are open for this window.
     nsCOMPtr<nsIObserverService> obs = GetObserverService();
     NS_WARN_IF_FALSE(obs, "Failed to get observer service!");
     if (obs && NS_FAILED(obs->NotifyObservers(static_cast<nsIRunnable*>(this),
                                               TOPIC_QUOTA_CANCEL, nullptr))) {
       NS_WARNING("Failed to notify observers!");
     }
     // If that didn't trigger an Observe callback (maybe the window had already
     // died?) then go ahead and do it manually.
     if (!mHasPrompted) {
       nsAutoString response;
       response.AppendInt(nsIPermissionManager::UNKNOWN_ACTION);
       if (NS_SUCCEEDED(Observe(nullptr, TOPIC_QUOTA_RESPONSE, response.get()))) {
         NS_ASSERTION(mHasPrompted, "Should have set this in Observe!");
       }
       else {
         NS_WARNING("Failed to notify!");
       }
     }
   }
 }
 // static
 uint32_t
 CheckQuotaHelper::GetQuotaPermission(nsIPrincipal* aPrincipal)
 {
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   NS_ASSERTION(aPrincipal, "Null principal!");
   NS_ASSERTION(!nsContentUtils::IsSystemPrincipal(aPrincipal),
                "Chrome windows shouldn't track quota!");
   nsCOMPtr<nsIPermissionManager> pm =
     do_GetService(NS_PERMISSIONMANAGER_CONTRACTID);
   NS_ENSURE_TRUE(pm, nsIPermissionManager::DENY_ACTION);
   uint32_t permission;
   nsresult rv = pm->TestPermissionFromPrincipal(aPrincipal,
                                                 PERMISSION_STORAGE_UNLIMITED,
                                                 &permission);
   NS_ENSURE_SUCCESS(rv, nsIPermissionManager::DENY_ACTION);
   return permission;
 }
 NS_IMPL_ISUPPORTS(CheckQuotaHelper, nsIRunnable,
                   nsIInterfaceRequestor,
                   nsIObserver)
 NS_IMETHODIMP
 CheckQuotaHelper::Run()
 {
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   nsresult rv = NS_OK;
   if (NS_SUCCEEDED(rv)) {
     if (!mHasPrompted) {
       mPromptResult = GetQuotaPermissionFromWindow(mWindow);
     }
     if (mHasPrompted) {
       // Add permissions to the database, but only if we are in the parent
       // process (if we are in the child process, we have already
       // set the permission when the prompt was shown in the parent, as
       // we cannot set the permission from the child).
       if (mPromptResult != nsIPermissionManager::UNKNOWN_ACTION &&
           XRE_GetProcessType() == GeckoProcessType_Default) {
         nsCOMPtr<nsIScriptObjectPrincipal> sop = do_QueryInterface(mWindow);
         NS_ENSURE_TRUE(sop, NS_ERROR_FAILURE);
         nsCOMPtr<nsIPermissionManager> permissionManager =
           do_GetService(NS_PERMISSIONMANAGER_CONTRACTID);
         NS_ENSURE_STATE(permissionManager);
         rv = permissionManager->AddFromPrincipal(sop->GetPrincipal(),
                                                  PERMISSION_STORAGE_UNLIMITED,
                                                  mPromptResult,
                                                  nsIPermissionManager::EXPIRE_NEVER, 0);
         NS_ENSURE_SUCCESS(rv, rv);
       }
     }
     else if (mPromptResult == nsIPermissionManager::UNKNOWN_ACTION) {
       uint32_t quota = QuotaManager::GetStorageQuotaMB();
       nsString quotaString;
       quotaString.AppendInt(quota);
       nsCOMPtr<nsIObserverService> obs = GetObserverService();
       NS_ENSURE_STATE(obs);
       // We have to watch to make sure that the window doesn't go away without
       // responding to us. Otherwise our database threads will hang.
       rv = obs->AddObserver(this, DOM_WINDOW_DESTROYED_TOPIC, false);
       NS_ENSURE_SUCCESS(rv, rv);
       rv = obs->NotifyObservers(static_cast<nsIRunnable*>(this),
                                 TOPIC_QUOTA_PROMPT, quotaString.get());
       NS_ENSURE_SUCCESS(rv, rv);
       return NS_OK;
     }
   }
   MutexAutoLock lock(mMutex);
   NS_ASSERTION(mWaiting, "Huh?!");
   // This should never be used again.
   mWindow = nullptr;
   mWaiting = false;
   mCondVar.NotifyAll();
   return NS_OK;
 }
 NS_IMETHODIMP
 CheckQuotaHelper::GetInterface(const nsIID& aIID,
                                void** aResult)
 {
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   if (aIID.Equals(NS_GET_IID(nsIObserver))) {
     return QueryInterface(aIID, aResult);
   }
   if (aIID.Equals(NS_GET_IID(nsIDOMWindow))) {
     return mWindow->QueryInterface(aIID, aResult);
   }
   *aResult = nullptr;
   return NS_ERROR_NOT_AVAILABLE;
 }
 NS_IMETHODIMP
 CheckQuotaHelper::Observe(nsISupports* aSubject,
                           const char* aTopic,
                           const char16_t* aData)
 {
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   nsresult rv;
   if (!strcmp(aTopic, TOPIC_QUOTA_RESPONSE)) {
     if (!mHasPrompted) {
       mHasPrompted = true;
       mPromptResult = nsDependentString(aData).ToInteger(&rv);
       NS_ENSURE_SUCCESS(rv, rv);
       rv = NS_DispatchToCurrentThread(this);
       NS_ENSURE_SUCCESS(rv, rv);
       // We no longer care about the window here.
       nsCOMPtr<nsIObserverService> obs = GetObserverService();
       NS_ENSURE_STATE(obs);
       rv = obs->RemoveObserver(this, DOM_WINDOW_DESTROYED_TOPIC);
       NS_ENSURE_SUCCESS(rv, rv);
     }
     return NS_OK;
   }
   if (!strcmp(aTopic, DOM_WINDOW_DESTROYED_TOPIC)) {
     NS_ASSERTION(!mHasPrompted, "Should have removed observer before now!");
     NS_ASSERTION(mWindow, "This should never be null!");
     nsCOMPtr<nsPIDOMWindow> window(do_QueryInterface(aSubject));
     NS_ENSURE_STATE(window);
     if (mWindow->GetSerial() == window->GetSerial()) {
       // This is our window, dying, without responding to our prompt! Fake one.
       mHasPrompted = true;
       mPromptResult = nsIPermissionManager::UNKNOWN_ACTION;
       rv = NS_DispatchToCurrentThread(this);
       NS_ENSURE_SUCCESS(rv, rv);
       // We no longer care about the window here.
       nsCOMPtr<nsIObserverService> obs = GetObserverService();
       NS_ENSURE_STATE(obs);
       rv = obs->RemoveObserver(this, DOM_WINDOW_DESTROYED_TOPIC);
       NS_ENSURE_SUCCESS(rv, rv);
     }
     return NS_OK;
   }
   NS_NOTREACHED("Unexpected topic!");
   return NS_ERROR_UNEXPECTED;
 }

The Tor Browser / annotate

dom/quota/CheckQuotaHelper.cpp@6474c204b198 (annotated)

dom/quota/CheckQuotaHelper.cpp