1 files changed, 173 insertions, 0 deletions
diff --git a/dom/security/sanitizer/Sanitizer.cpp b/dom/security/sanitizer/Sanitizer.cpp
new file mode 100644
index 0000000000..b302a76b7a
--- /dev/null
+++ b/dom/security/sanitizer/Sanitizer.cpp
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=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 "BindingDeclarations.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/dom/DocumentFragment.h"
+#include "mozilla/dom/SanitizerBinding.h"
+#include "nsContentUtils.h"
+#include "nsGenericHTMLElement.h"
+#include "nsTreeSanitizer.h"
+#include "Sanitizer.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Sanitizer, mGlobal)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(Sanitizer)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(Sanitizer)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Sanitizer)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+JSObject* Sanitizer::WrapObject(JSContext* aCx,
+                                JS::Handle<JSObject*> aGivenProto) {
+  return Sanitizer_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+/* static */
+already_AddRefed<Sanitizer> Sanitizer::Constructor(
+    const GlobalObject& aGlobal, const SanitizerConfig& aOptions,
+    ErrorResult& aRv) {
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  RefPtr<Sanitizer> sanitizer = new Sanitizer(global, aOptions);
+  return sanitizer.forget();
+}
+
+/* static */
+already_AddRefed<DocumentFragment> Sanitizer::InputToNewFragment(
+    const mozilla::dom::DocumentFragmentOrDocument& aInput, ErrorResult& aRv) {
+  // turns an DocumentFragmentOrDocument into a new DocumentFragment for
+  // internal use with nsTreeSanitizer
+
+  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(mGlobal);
+  if (!window || !window->GetDoc()) {
+    // FIXME: Should we throw another exception?
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  // We need to create a new docfragment based on the input
+  // and can't use a live document (possibly with mutation observershandlers)
+  nsAutoString innerHTML;
+  if (aInput.IsDocumentFragment()) {
+    RefPtr<DocumentFragment> inFragment = &aInput.GetAsDocumentFragment();
+    inFragment->GetInnerHTML(innerHTML);
+  } else if (aInput.IsDocument()) {
+    RefPtr<Document> doc = &aInput.GetAsDocument();
+    nsCOMPtr<Element> docElement = doc->GetDocumentElement();
+    if (docElement) {
+      docElement->GetInnerHTML(innerHTML, IgnoreErrors());
+    }
+  }
+  if (innerHTML.IsEmpty()) {
+    AutoTArray<nsString, 1> params = {};
+    LogLocalizedString("SanitizerRcvdNoInput", params,
+                       nsIScriptError::warningFlag);
+
+    RefPtr<DocumentFragment> emptyFragment =
+        window->GetDoc()->CreateDocumentFragment();
+    return emptyFragment.forget();
+  }
+  // Create an inert HTML document, loaded as data.
+  // this ensures we do not cause any requests.
+  RefPtr<Document> emptyDoc =
+      nsContentUtils::CreateInertHTMLDocument(window->GetDoc());
+  if (!emptyDoc) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+  // We don't have a context element yet. let's create a mock HTML body element
+  RefPtr<mozilla::dom::NodeInfo> info =
+      emptyDoc->NodeInfoManager()->GetNodeInfo(
+          nsGkAtoms::body, nullptr, kNameSpaceID_XHTML, nsINode::ELEMENT_NODE);
+
+  nsCOMPtr<nsINode> context = NS_NewHTMLBodyElement(
+      info.forget(), mozilla::dom::FromParser::FROM_PARSER_FRAGMENT);
+  RefPtr<DocumentFragment> fragment = nsContentUtils::CreateContextualFragment(
+      context, innerHTML, true /* aPreventScriptExecution */, aRv);
+  if (aRv.Failed()) {
+    aRv.ThrowInvalidStateError("Could not parse input");
+    return nullptr;
+  }
+  return fragment.forget();
+}
+
+already_AddRefed<DocumentFragment> Sanitizer::Sanitize(
+    const mozilla::dom::DocumentFragmentOrDocument& aInput, ErrorResult& aRv) {
+  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(mGlobal);
+  if (!window || !window->GetDoc()) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+  RefPtr<DocumentFragment> fragment =
+      Sanitizer::InputToNewFragment(aInput, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  mTreeSanitizer.Sanitize(fragment);
+  return fragment.forget();
+}
+
+RefPtr<DocumentFragment> Sanitizer::SanitizeFragment(
+    RefPtr<DocumentFragment> aFragment, ErrorResult& aRv) {
+  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(mGlobal);
+  if (!window || !window->GetDoc()) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+  // FIXME(freddyb)
+  // (how) can we assert that the supplied doc is indeed inert?
+  mTreeSanitizer.Sanitize(aFragment);
+  return aFragment.forget();
+}
+
+/* ------ Logging ------ */
+
+void Sanitizer::LogLocalizedString(const char* aName,
+                                   const nsTArray<nsString>& aParams,
+                                   uint32_t aFlags) {
+  uint64_t innerWindowID = 0;
+  bool isPrivateBrowsing = true;
+  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(mGlobal);
+  if (window && window->GetDoc()) {
+    auto* doc = window->GetDoc();
+    innerWindowID = doc->InnerWindowID();
+    isPrivateBrowsing = nsContentUtils::IsInPrivateBrowsing(doc);
+  }
+  nsAutoString logMsg;
+  nsContentUtils::FormatLocalizedString(nsContentUtils::eSECURITY_PROPERTIES,
+                                        aName, aParams, logMsg);
+  LogMessage(logMsg, aFlags, innerWindowID, isPrivateBrowsing);
+}
+
+/* static */
+void Sanitizer::LogMessage(const nsAString& aMessage, uint32_t aFlags,
+                           uint64_t aInnerWindowID, bool aFromPrivateWindow) {
+  // Prepending 'Sanitizer' to the outgoing console message
+  nsString message;
+  message.AppendLiteral(u"Sanitizer: ");
+  message.Append(aMessage);
+
+  // Allow for easy distinction in devtools code.
+  constexpr auto category = "Sanitizer"_ns;
+
+  if (aInnerWindowID > 0) {
+    // Send to content console
+    nsContentUtils::ReportToConsoleByWindowID(message, aFlags, category,
+                                              aInnerWindowID);
+  } else {
+    // Send to browser console
+    nsContentUtils::LogSimpleConsoleError(message, category, aFromPrivateWindow,
+                                          true /* from chrome context */,
+                                          aFlags);
+  }
+}
+
+}  // namespace mozilla::dom