mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-27 14:52:16 +00:00
557 lines
18 KiB
C++
557 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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 "L10nOverlays.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/DocumentFragment.h"
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#include "mozilla/dom/HTMLInputElement.h"
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#include "HTMLSplitOnSpacesTokenizer.h"
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#include "nsHtml5StringParser.h"
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#include "nsTextNode.h"
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#include "nsIParserUtils.h"
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#include "nsINodeList.h"
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using namespace mozilla::dom;
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using namespace mozilla;
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/**
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* Check if attribute is allowed for the given element.
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*
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* This method is used by the sanitizer when the translation markup contains DOM
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* attributes, or when the translation has traits which map to DOM attributes.
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*
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* `aExplicitlyAllowed` can be passed as a list of attributes explicitly allowed
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* on this element.
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*/
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static bool IsAttrNameLocalizable(
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const nsAtom* aAttrName, Element* aElement,
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const nsTArray<nsString>& aExplicitlyAllowed) {
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if (!aExplicitlyAllowed.IsEmpty()) {
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nsAutoString name;
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aAttrName->ToString(name);
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if (aExplicitlyAllowed.Contains(name)) {
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return true;
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}
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}
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nsAtom* elemName = aElement->NodeInfo()->NameAtom();
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uint32_t nameSpace = aElement->NodeInfo()->NamespaceID();
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if (nameSpace == kNameSpaceID_XHTML) {
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// Is it a globally safe attribute?
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if (aAttrName == nsGkAtoms::title || aAttrName == nsGkAtoms::aria_label ||
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aAttrName == nsGkAtoms::aria_description) {
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return true;
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}
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// Is it allowed on this element?
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if (elemName == nsGkAtoms::a) {
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return aAttrName == nsGkAtoms::download;
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}
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if (elemName == nsGkAtoms::area) {
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return aAttrName == nsGkAtoms::download || aAttrName == nsGkAtoms::alt;
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}
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if (elemName == nsGkAtoms::input) {
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// Special case for value on HTML inputs with type button, reset, submit
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if (aAttrName == nsGkAtoms::value) {
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HTMLInputElement* input = HTMLInputElement::FromNode(aElement);
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if (input) {
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auto type = input->ControlType();
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if (type == FormControlType::InputSubmit ||
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type == FormControlType::InputButton ||
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type == FormControlType::InputReset) {
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return true;
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}
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}
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}
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return aAttrName == nsGkAtoms::alt || aAttrName == nsGkAtoms::placeholder;
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}
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if (elemName == nsGkAtoms::menuitem) {
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return aAttrName == nsGkAtoms::label;
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}
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if (elemName == nsGkAtoms::menu) {
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return aAttrName == nsGkAtoms::label;
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}
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if (elemName == nsGkAtoms::optgroup) {
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return aAttrName == nsGkAtoms::label;
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}
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if (elemName == nsGkAtoms::option) {
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return aAttrName == nsGkAtoms::label;
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}
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if (elemName == nsGkAtoms::track) {
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return aAttrName == nsGkAtoms::label;
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}
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if (elemName == nsGkAtoms::img) {
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return aAttrName == nsGkAtoms::alt;
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}
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if (elemName == nsGkAtoms::textarea) {
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return aAttrName == nsGkAtoms::placeholder;
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}
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if (elemName == nsGkAtoms::th) {
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return aAttrName == nsGkAtoms::abbr;
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}
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} else if (nameSpace == kNameSpaceID_XUL) {
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// Is it a globally safe attribute?
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if (aAttrName == nsGkAtoms::accesskey ||
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aAttrName == nsGkAtoms::aria_label || aAttrName == nsGkAtoms::label ||
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aAttrName == nsGkAtoms::title || aAttrName == nsGkAtoms::tooltiptext) {
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return true;
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}
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// Is it allowed on this element?
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if (elemName == nsGkAtoms::description) {
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return aAttrName == nsGkAtoms::value;
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}
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if (elemName == nsGkAtoms::key) {
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return aAttrName == nsGkAtoms::key || aAttrName == nsGkAtoms::keycode;
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}
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if (elemName == nsGkAtoms::label) {
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return aAttrName == nsGkAtoms::value;
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}
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}
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return false;
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}
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already_AddRefed<nsINode> L10nOverlays::CreateTextNodeFromTextContent(
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Element* aElement, ErrorResult& aRv) {
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nsAutoString content;
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aElement->GetTextContent(content, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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return aElement->OwnerDoc()->CreateTextNode(content);
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}
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class AttributeNameValueComparator {
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public:
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bool Equals(const AttributeNameValue& aAttribute,
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const nsAttrName* aAttrName) const {
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return aAttrName->Equals(NS_ConvertUTF8toUTF16(aAttribute.mName));
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}
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};
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void L10nOverlays::OverlayAttributes(
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const Nullable<Sequence<AttributeNameValue>>& aTranslation,
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Element* aToElement, ErrorResult& aRv) {
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nsTArray<nsString> explicitlyAllowed;
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{
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nsAutoString l10nAttrs;
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if (aToElement->GetAttr(nsGkAtoms::datal10nattrs, l10nAttrs)) {
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HTMLSplitOnSpacesTokenizer tokenizer(l10nAttrs, ',');
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while (tokenizer.hasMoreTokens()) {
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const nsAString& token = tokenizer.nextToken();
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if (!token.IsEmpty() && !explicitlyAllowed.Contains(token)) {
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explicitlyAllowed.AppendElement(token);
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}
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}
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}
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}
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uint32_t i = aToElement->GetAttrCount();
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while (i > 0) {
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const nsAttrName* attrName = aToElement->GetAttrNameAt(i - 1);
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if (IsAttrNameLocalizable(attrName->LocalName(), aToElement,
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explicitlyAllowed) &&
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(aTranslation.IsNull() ||
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!aTranslation.Value().Contains(attrName,
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AttributeNameValueComparator()))) {
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RefPtr<nsAtom> localName = attrName->LocalName();
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aToElement->UnsetAttr(localName, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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}
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i--;
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}
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if (aTranslation.IsNull()) {
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return;
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}
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for (auto& attribute : aTranslation.Value()) {
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RefPtr<nsAtom> nameAtom = NS_Atomize(attribute.mName);
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if (IsAttrNameLocalizable(nameAtom, aToElement, explicitlyAllowed)) {
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NS_ConvertUTF8toUTF16 value(attribute.mValue);
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if (!aToElement->AttrValueIs(kNameSpaceID_None, nameAtom, value,
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eCaseMatters)) {
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aToElement->SetAttr(nameAtom, value, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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}
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}
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}
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}
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void L10nOverlays::OverlayAttributes(Element* aFromElement, Element* aToElement,
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ErrorResult& aRv) {
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Nullable<Sequence<AttributeNameValue>> attributes;
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uint32_t attrCount = aFromElement->GetAttrCount();
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if (attrCount == 0) {
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attributes.SetNull();
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} else {
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Sequence<AttributeNameValue> sequence;
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uint32_t i = 0;
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while (BorrowedAttrInfo info = aFromElement->GetAttrInfoAt(i++)) {
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AttributeNameValue* attr = sequence.AppendElement(fallible);
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MOZ_ASSERT(info.mName->NamespaceEquals(kNameSpaceID_None),
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"No namespaced attributes allowed.");
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info.mName->LocalName()->ToUTF8String(attr->mName);
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nsAutoString value;
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info.mValue->ToString(value);
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attr->mValue.Assign(NS_ConvertUTF16toUTF8(value));
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}
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attributes.SetValue(sequence);
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}
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return OverlayAttributes(attributes, aToElement, aRv);
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}
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void L10nOverlays::ShallowPopulateUsing(Element* aFromElement,
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Element* aToElement, ErrorResult& aRv) {
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nsAutoString content;
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aFromElement->GetTextContent(content, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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aToElement->SetTextContent(content, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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OverlayAttributes(aFromElement, aToElement, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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}
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already_AddRefed<nsINode> L10nOverlays::GetNodeForNamedElement(
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Element* aSourceElement, Element* aTranslatedChild,
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nsTArray<L10nOverlaysError>& aErrors, ErrorResult& aRv) {
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nsAutoString childName;
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aTranslatedChild->GetAttr(nsGkAtoms::datal10nname, childName);
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RefPtr<Element> sourceChild = nullptr;
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nsINodeList* childNodes = aSourceElement->ChildNodes();
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for (uint32_t i = 0; i < childNodes->Length(); i++) {
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nsINode* childNode = childNodes->Item(i);
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if (!childNode->IsElement()) {
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continue;
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}
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Element* childElement = childNode->AsElement();
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if (childElement->AttrValueIs(kNameSpaceID_None, nsGkAtoms::datal10nname,
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childName, eCaseMatters)) {
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sourceChild = childElement;
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break;
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}
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}
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if (!sourceChild) {
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L10nOverlaysError error;
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error.mCode.Construct(L10nOverlays_Binding::ERROR_NAMED_ELEMENT_MISSING);
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error.mL10nName.Construct(childName);
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aErrors.AppendElement(error);
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return CreateTextNodeFromTextContent(aTranslatedChild, aRv);
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}
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nsAtom* sourceChildName = sourceChild->NodeInfo()->NameAtom();
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nsAtom* translatedChildName = aTranslatedChild->NodeInfo()->NameAtom();
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if (sourceChildName != translatedChildName &&
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// Create a specific exception for img vs. image mismatches,
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// see bug 1543493
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!(translatedChildName == nsGkAtoms::img &&
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sourceChildName == nsGkAtoms::image)) {
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L10nOverlaysError error;
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error.mCode.Construct(
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L10nOverlays_Binding::ERROR_NAMED_ELEMENT_TYPE_MISMATCH);
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error.mL10nName.Construct(childName);
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error.mTranslatedElementName.Construct(
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aTranslatedChild->NodeInfo()->LocalName());
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error.mSourceElementName.Construct(sourceChild->NodeInfo()->LocalName());
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aErrors.AppendElement(error);
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return CreateTextNodeFromTextContent(aTranslatedChild, aRv);
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}
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aSourceElement->RemoveChild(*sourceChild, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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RefPtr<nsINode> clone = sourceChild->CloneNode(false, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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ShallowPopulateUsing(aTranslatedChild, clone->AsElement(), aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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return clone.forget();
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}
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bool L10nOverlays::IsElementAllowed(Element* aElement) {
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uint32_t nameSpace = aElement->NodeInfo()->NamespaceID();
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if (nameSpace != kNameSpaceID_XHTML) {
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return false;
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}
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nsAtom* nameAtom = aElement->NodeInfo()->NameAtom();
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return nameAtom == nsGkAtoms::em || nameAtom == nsGkAtoms::strong ||
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nameAtom == nsGkAtoms::small || nameAtom == nsGkAtoms::s ||
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nameAtom == nsGkAtoms::cite || nameAtom == nsGkAtoms::q ||
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nameAtom == nsGkAtoms::dfn || nameAtom == nsGkAtoms::abbr ||
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nameAtom == nsGkAtoms::data || nameAtom == nsGkAtoms::time ||
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nameAtom == nsGkAtoms::code || nameAtom == nsGkAtoms::var ||
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nameAtom == nsGkAtoms::samp || nameAtom == nsGkAtoms::kbd ||
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nameAtom == nsGkAtoms::sub || nameAtom == nsGkAtoms::sup ||
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nameAtom == nsGkAtoms::i || nameAtom == nsGkAtoms::b ||
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nameAtom == nsGkAtoms::u || nameAtom == nsGkAtoms::mark ||
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nameAtom == nsGkAtoms::bdi || nameAtom == nsGkAtoms::bdo ||
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nameAtom == nsGkAtoms::span || nameAtom == nsGkAtoms::br ||
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nameAtom == nsGkAtoms::wbr;
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}
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already_AddRefed<Element> L10nOverlays::CreateSanitizedElement(
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Element* aElement, ErrorResult& aRv) {
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// Start with an empty element of the same type to remove nested children
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// and non-localizable attributes defined by the translation.
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nsAutoString nameSpaceURI;
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aElement->NodeInfo()->GetNamespaceURI(nameSpaceURI);
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ElementCreationOptionsOrString options;
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RefPtr<Element> clone = aElement->OwnerDoc()->CreateElementNS(
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nameSpaceURI, aElement->NodeInfo()->LocalName(), options, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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ShallowPopulateUsing(aElement, clone, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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return clone.forget();
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}
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void L10nOverlays::OverlayChildNodes(DocumentFragment* aFromFragment,
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Element* aToElement,
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nsTArray<L10nOverlaysError>& aErrors,
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ErrorResult& aRv) {
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nsINodeList* childNodes = aFromFragment->ChildNodes();
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for (uint32_t i = 0; i < childNodes->Length(); i++) {
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nsINode* childNode = childNodes->Item(i);
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if (!childNode->IsElement()) {
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// Keep the translated text node.
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continue;
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}
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RefPtr<Element> childElement = childNode->AsElement();
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if (childElement->HasAttr(nsGkAtoms::datal10nname)) {
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RefPtr<nsINode> sanitized =
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GetNodeForNamedElement(aToElement, childElement, aErrors, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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aFromFragment->ReplaceChild(*sanitized, *childNode, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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continue;
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}
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if (IsElementAllowed(childElement)) {
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RefPtr<Element> sanitized = CreateSanitizedElement(childElement, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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aFromFragment->ReplaceChild(*sanitized, *childNode, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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continue;
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}
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L10nOverlaysError error;
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error.mCode.Construct(L10nOverlays_Binding::ERROR_FORBIDDEN_TYPE);
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error.mTranslatedElementName.Construct(
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childElement->NodeInfo()->LocalName());
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aErrors.AppendElement(error);
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// If all else fails, replace the element with its text content.
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RefPtr<nsINode> textNode = CreateTextNodeFromTextContent(childElement, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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aFromFragment->ReplaceChild(*textNode, *childNode, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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}
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while (aToElement->HasChildren()) {
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nsIContent* child = aToElement->GetLastChild();
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#ifdef DEBUG
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if (child->IsElement()) {
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if (child->AsElement()->HasAttr(nsGkAtoms::datal10nid)) {
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L10nOverlaysError error;
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error.mCode.Construct(
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L10nOverlays_Binding::ERROR_TRANSLATED_ELEMENT_DISCONNECTED);
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nsAutoString id;
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child->AsElement()->GetAttr(nsGkAtoms::datal10nid, id);
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error.mL10nName.Construct(id);
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error.mTranslatedElementName.Construct(
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aToElement->NodeInfo()->LocalName());
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aErrors.AppendElement(error);
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} else if (child->AsElement()->ChildElementCount() > 0) {
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L10nOverlaysError error;
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error.mCode.Construct(
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L10nOverlays_Binding::ERROR_TRANSLATED_ELEMENT_DISALLOWED_DOM);
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nsAutoString id;
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aToElement->GetAttr(nsGkAtoms::datal10nid, id);
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error.mL10nName.Construct(id);
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error.mTranslatedElementName.Construct(
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aToElement->NodeInfo()->LocalName());
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aErrors.AppendElement(error);
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}
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}
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#endif
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aToElement->RemoveChildNode(child, true);
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}
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aToElement->AppendChild(*aFromFragment, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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}
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void L10nOverlays::TranslateElement(
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const GlobalObject& aGlobal, Element& aElement,
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const L10nMessage& aTranslation,
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Nullable<nsTArray<L10nOverlaysError>>& aErrors) {
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nsTArray<L10nOverlaysError> errors;
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ErrorResult rv;
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TranslateElement(aElement, aTranslation, errors, rv);
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if (NS_WARN_IF(rv.Failed())) {
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L10nOverlaysError error;
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error.mCode.Construct(L10nOverlays_Binding::ERROR_UNKNOWN);
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errors.AppendElement(error);
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}
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if (!errors.IsEmpty()) {
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aErrors.SetValue(std::move(errors));
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}
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}
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bool L10nOverlays::ContainsMarkup(const nsACString& aStr) {
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// We use our custom ContainsMarkup rather than the
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// one from FragmentOrElement.cpp, because we don't
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// want to trigger HTML parsing on every `Preferences & Options`
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// type of string.
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const char* start = aStr.BeginReading();
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const char* end = aStr.EndReading();
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while (start != end) {
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char c = *start;
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if (c == '<') {
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return true;
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}
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++start;
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if (c == '&' && start != end) {
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c = *start;
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if (c == '#' || (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') ||
|
|
(c >= 'A' && c <= 'Z')) {
|
|
return true;
|
|
}
|
|
++start;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void L10nOverlays::TranslateElement(Element& aElement,
|
|
const L10nMessage& aTranslation,
|
|
nsTArray<L10nOverlaysError>& aErrors,
|
|
ErrorResult& aRv) {
|
|
if (!aTranslation.mValue.IsVoid()) {
|
|
NodeInfo* nodeInfo = aElement.NodeInfo();
|
|
if (nodeInfo->NameAtom() == nsGkAtoms::title &&
|
|
nodeInfo->NamespaceID() == kNameSpaceID_XHTML) {
|
|
// A special case for the HTML title element whose content must be text.
|
|
aElement.SetTextContent(NS_ConvertUTF8toUTF16(aTranslation.mValue), aRv);
|
|
if (NS_WARN_IF(aRv.Failed())) {
|
|
return;
|
|
}
|
|
} else if (!ContainsMarkup(aTranslation.mValue)) {
|
|
#ifdef DEBUG
|
|
if (aElement.ChildElementCount() > 0) {
|
|
L10nOverlaysError error;
|
|
error.mCode.Construct(
|
|
L10nOverlays_Binding::ERROR_TRANSLATED_ELEMENT_DISALLOWED_DOM);
|
|
nsAutoString id;
|
|
aElement.GetAttr(nsGkAtoms::datal10nid, id);
|
|
error.mL10nName.Construct(id);
|
|
error.mTranslatedElementName.Construct(
|
|
aElement.GetLastElementChild()->NodeInfo()->LocalName());
|
|
aErrors.AppendElement(error);
|
|
}
|
|
#endif
|
|
// If the translation doesn't contain any markup skip the overlay logic.
|
|
aElement.SetTextContent(NS_ConvertUTF8toUTF16(aTranslation.mValue), aRv);
|
|
if (NS_WARN_IF(aRv.Failed())) {
|
|
return;
|
|
}
|
|
} else {
|
|
// Else parse the translation's HTML into a DocumentFragment,
|
|
// sanitize it and replace the element's content.
|
|
RefPtr<DocumentFragment> fragment =
|
|
new (aElement.OwnerDoc()->NodeInfoManager())
|
|
DocumentFragment(aElement.OwnerDoc()->NodeInfoManager());
|
|
// Note: these flags should be no less restrictive than the ones in
|
|
// nsContentUtils::ParseFragmentHTML .
|
|
// We supply the flags here because otherwise the parsing of HTML can
|
|
// trip DEBUG-only crashes, see bug 1809902 for details.
|
|
auto sanitizationFlags = nsIParserUtils::SanitizerDropForms |
|
|
nsIParserUtils::SanitizerLogRemovals;
|
|
nsContentUtils::ParseFragmentHTML(
|
|
NS_ConvertUTF8toUTF16(aTranslation.mValue), fragment,
|
|
nsGkAtoms::_template, kNameSpaceID_XHTML, false, true,
|
|
sanitizationFlags);
|
|
if (NS_WARN_IF(aRv.Failed())) {
|
|
return;
|
|
}
|
|
|
|
OverlayChildNodes(fragment, &aElement, aErrors, aRv);
|
|
if (NS_WARN_IF(aRv.Failed())) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Even if the translation doesn't define any localizable attributes, run
|
|
// overlayAttributes to remove any localizable attributes set by previous
|
|
// translations.
|
|
OverlayAttributes(aTranslation.mAttributes, &aElement, aRv);
|
|
if (NS_WARN_IF(aRv.Failed())) {
|
|
return;
|
|
}
|
|
}
|