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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 http://mozilla.org/MPL/2.0/. */
#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)
NS_IMETHODIMP
ImageBlocker::ShouldLoad(nsIURI* aContentLocation, nsILoadInfo* aLoadInfo,
int16_t* aShouldLoad) {
*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;
}
ExtContentPolicyType contentType = aLoadInfo->GetExternalContentPolicyType();
if (contentType != ExtContentPolicy::TYPE_IMAGE &&
contentType != ExtContentPolicy::TYPE_IMAGESET) {
return NS_OK;
}
if (ImageBlocker::ShouldBlock(aContentLocation)) {
NS_SetRequestBlockingReason(
aLoadInfo, nsILoadInfo::BLOCKING_REASON_CONTENT_POLICY_CONTENT_BLOCKED);
*aShouldLoad = nsIContentPolicy::REJECT_TYPE;
}
return NS_OK;
}
NS_IMETHODIMP
ImageBlocker::ShouldProcess(nsIURI* aContentLocation, nsILoadInfo* aLoadInfo,
int16_t* aShouldProcess) {
// We block images at load level already, so those should not end up here.
*aShouldProcess = nsIContentPolicy::ACCEPT;
return NS_OK;
}
/* static */
bool ImageBlocker::ShouldBlock(nsIURI* aContentLocation) {
// Block loading images depending on the permissions.default.image pref.
if (StaticPrefs::permissions_default_image() !=
nsIPermissionManager::DENY_ACTION) {
return false;
}
// we only want to check http, https
// for chrome:// and resources and others, no need to check.
return net::SchemeIsHttpOrHttps(aContentLocation);
}
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