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/* 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 */
#include "ImageBlocker.h"
#include "nsIPermissionManager.h"
#include "nsContentUtils.h"
#include "mozilla/StaticPrefs_permissions.h"
#include "nsNetUtil.h"
using namespace mozilla;
using namespace mozilla::image;
NS_IMPL_ISUPPORTS(ImageBlocker, nsIContentPolicy)
ImageBlocker::ShouldLoad(nsIURI* aContentLocation, nsILoadInfo* aLoadInfo,
const nsACString& aMimeGuess, int16_t* aShouldLoad) {
ExtContentPolicyType contentType = aLoadInfo->GetExternalContentPolicyType();
*aShouldLoad = nsIContentPolicy::ACCEPT;
if (!aContentLocation) {
// Bug 1720280: Ideally we should block the load, but to avoid a potential
// null pointer deref, we return early in this case. Please note that
// the ImageBlocker only applies about http/https loads anyway.
return NS_OK;
// we only want to check http, https
// for chrome:// and resources and others, no need to check.
nsAutoCString scheme;
if (!scheme.LowerCaseEqualsLiteral("http") &&
!scheme.LowerCaseEqualsLiteral("https")) {
return NS_OK;
// Block loading images depending on the permissions.default.image pref.
if ((contentType == ExtContentPolicy::TYPE_IMAGE ||
contentType == ExtContentPolicy::TYPE_IMAGESET) &&
StaticPrefs::permissions_default_image() ==
nsIPermissionManager::DENY_ACTION) {
*aShouldLoad = nsIContentPolicy::REJECT_TYPE;
return NS_OK;
ImageBlocker::ShouldProcess(nsIURI* aContentLocation, nsILoadInfo* aLoadInfo,
const nsACString& aMimeGuess,
int16_t* aShouldProcess) {
// We block images at load level already, so those should not end up here.
*aShouldProcess = nsIContentPolicy::ACCEPT;
return NS_OK;