tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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nsParserUtils.cpp (4309B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* This Source Code Form is subject to the terms of the Mozilla Public
      3 * License, v. 2.0. If a copy of the MPL was not distributed with this
      4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      5 
      6 #include "nsParserUtils.h"
      7 #include "mozilla/NullPrincipal.h"
      8 #include "mozilla/dom/DocumentFragment.h"
      9 #include "mozilla/dom/Element.h"
     10 #include "mozilla/dom/ScriptLoader.h"
     11 #include "nsAttrName.h"
     12 #include "nsCOMPtr.h"
     13 #include "nsContentUtils.h"
     14 #include "nsEscape.h"
     15 #include "nsHTMLParts.h"
     16 #include "nsHtml5Module.h"
     17 #include "nsIContent.h"
     18 #include "nsIContentSink.h"
     19 #include "mozilla/dom/Document.h"
     20 #include "nsIDocumentEncoder.h"
     21 #include "nsIFragmentContentSink.h"
     22 #include "nsIParser.h"
     23 #include "nsNetCID.h"
     24 #include "nsNetUtil.h"
     25 #include "nsString.h"
     26 #include "nsTreeSanitizer.h"
     27 #include "nsXPCOM.h"
     28 
     29 #define XHTML_DIV_TAG u"div xmlns=\"http://www.w3.org/1999/xhtml\""
     30 
     31 using namespace mozilla::dom;
     32 
     33 NS_IMPL_ISUPPORTS(nsParserUtils, nsIParserUtils)
     34 
     35 NS_IMETHODIMP
     36 nsParserUtils::ConvertToPlainText(const nsAString& aFromStr, uint32_t aFlags,
     37                                  uint32_t aWrapCol, nsAString& aToStr) {
     38  return nsContentUtils::ConvertToPlainText(aFromStr, aToStr, aFlags, aWrapCol);
     39 }
     40 
     41 template <typename Callable>
     42 static nsresult SanitizeWith(const nsAString& aInput, nsAString& aOutput,
     43                             Callable aDoSanitize) {
     44  RefPtr<Document> document = nsContentUtils::CreateInertHTMLDocument(nullptr);
     45  if (!document) {
     46    return NS_ERROR_FAILURE;
     47  }
     48 
     49  nsresult rv = nsContentUtils::ParseDocumentHTML(aInput, document, false);
     50  NS_ENSURE_SUCCESS(rv, rv);
     51 
     52  aDoSanitize(document.get());
     53 
     54  nsCOMPtr<nsIDocumentEncoder> encoder = do_createDocumentEncoder("text/html");
     55  encoder->Init(document, u"text/html"_ns,
     56                nsIDocumentEncoder::OutputDontRewriteEncodingDeclaration |
     57                    nsIDocumentEncoder::OutputNoScriptContent |
     58                    nsIDocumentEncoder::OutputEncodeBasicEntities |
     59                    nsIDocumentEncoder::OutputLFLineBreak |
     60                    nsIDocumentEncoder::OutputRaw);
     61  return encoder->EncodeToString(aOutput);
     62 }
     63 
     64 NS_IMETHODIMP
     65 nsParserUtils::Sanitize(const nsAString& aFromStr, uint32_t aFlags,
     66                        nsAString& aToStr) {
     67  return SanitizeWith(aFromStr, aToStr, [&](Document* aDocument) {
     68    nsTreeSanitizer sanitizer(aFlags);
     69    sanitizer.Sanitize(aDocument);
     70  });
     71 }
     72 
     73 NS_IMETHODIMP
     74 nsParserUtils::RemoveConditionalCSS(const nsAString& aFromStr,
     75                                    nsAString& aToStr) {
     76  return SanitizeWith(aFromStr, aToStr, [](Document* aDocument) {
     77    nsTreeSanitizer::RemoveConditionalCSSFromSubtree(aDocument);
     78  });
     79 }
     80 
     81 NS_IMETHODIMP
     82 nsParserUtils::ParseFragment(const nsAString& aFragment, uint32_t aFlags,
     83                             bool aIsXML, nsIURI* aBaseURI,
     84                             Element* aContextElement,
     85                             DocumentFragment** aReturn) {
     86  NS_ENSURE_ARG(aContextElement);
     87  *aReturn = nullptr;
     88 
     89  RefPtr<Document> document = aContextElement->OwnerDoc();
     90 
     91  nsAutoScriptBlockerSuppressNodeRemoved autoBlocker;
     92 
     93  bool scripts_enabled = false;
     94  // stop scripts
     95  RefPtr<ScriptLoader> loader = document->GetScriptLoader();
     96  if (loader) {
     97    scripts_enabled = loader->GetEnabled();
     98    if (scripts_enabled) {
     99      loader->SetEnabled(false);
    100    }
    101  }
    102 
    103  // Wrap things in a div or body for parsing, but it won't show up in
    104  // the fragment.
    105  nsresult rv = NS_OK;
    106  AutoTArray<nsString, 2> tagStack;
    107  RefPtr<DocumentFragment> fragment;
    108  if (aIsXML) {
    109    // XHTML
    110    tagStack.AppendElement(nsLiteralString(XHTML_DIV_TAG));
    111    rv = nsContentUtils::ParseFragmentXML(aFragment, document, tagStack, true,
    112                                          aFlags, getter_AddRefs(fragment));
    113  } else {
    114    fragment = new (document->NodeInfoManager())
    115        DocumentFragment(document->NodeInfoManager());
    116    rv = nsContentUtils::ParseFragmentHTML(aFragment, fragment, nsGkAtoms::body,
    117                                           kNameSpaceID_XHTML, false, true,
    118                                           aFlags);
    119  }
    120 
    121  if (scripts_enabled) {
    122    loader->SetEnabled(true);
    123  }
    124 
    125  fragment.forget(aReturn);
    126  return rv;
    127 }