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64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ImageBlocker.h"
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#include "nsIPermissionManager.h"
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#include "nsContentUtils.h"
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#include "mozilla/StaticPrefs_permissions.h"
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#include "nsNetUtil.h"
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using namespace mozilla;
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using namespace mozilla::image;
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NS_IMPL_ISUPPORTS(ImageBlocker, nsIContentPolicy)
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NS_IMETHODIMP
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ImageBlocker::ShouldLoad(nsIURI* aContentLocation, nsILoadInfo* aLoadInfo,
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int16_t* aShouldLoad) {
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*aShouldLoad = nsIContentPolicy::ACCEPT;
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if (!aContentLocation) {
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// Bug 1720280: Ideally we should block the load, but to avoid a potential
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// null pointer deref, we return early in this case. Please note that
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// the ImageBlocker only applies about http/https loads anyway.
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return NS_OK;
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}
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ExtContentPolicyType contentType = aLoadInfo->GetExternalContentPolicyType();
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if (contentType != ExtContentPolicy::TYPE_IMAGE &&
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contentType != ExtContentPolicy::TYPE_IMAGESET) {
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return NS_OK;
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}
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if (ImageBlocker::ShouldBlock(aContentLocation)) {
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NS_SetRequestBlockingReason(
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aLoadInfo, nsILoadInfo::BLOCKING_REASON_CONTENT_POLICY_CONTENT_BLOCKED);
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*aShouldLoad = nsIContentPolicy::REJECT_TYPE;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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ImageBlocker::ShouldProcess(nsIURI* aContentLocation, nsILoadInfo* aLoadInfo,
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int16_t* aShouldProcess) {
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// We block images at load level already, so those should not end up here.
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*aShouldProcess = nsIContentPolicy::ACCEPT;
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return NS_OK;
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}
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/* static */
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bool ImageBlocker::ShouldBlock(nsIURI* aContentLocation) {
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// Block loading images depending on the permissions.default.image pref.
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if (StaticPrefs::permissions_default_image() !=
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nsIPermissionManager::DENY_ACTION) {
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return false;
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}
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// we only want to check http, https
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// for chrome:// and resources and others, no need to check.
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return aContentLocation->SchemeIs("http") ||
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aContentLocation->SchemeIs("https");
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}
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