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gecko-dev/parser/htmlparser/nsExpatDriver.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsExpatDriver.h"
#include "nsCOMPtr.h"
#include "nsParserCIID.h"
#include "CParserContext.h"
#include "nsIExpatSink.h"
#include "nsIContentSink.h"
#include "nsParserMsgUtils.h"
#include "nsIURL.h"
#include "nsIUnicharInputStream.h"
#include "nsIProtocolHandler.h"
#include "nsNetUtil.h"
#include "nsTextFormatter.h"
#include "nsDirectoryServiceDefs.h"
#include "nsCRT.h"
#include "nsIConsoleService.h"
#include "nsIScriptError.h"
#include "nsIContentPolicy.h"
#include "nsContentPolicyUtils.h"
#include "nsError.h"
#include "nsXPCOMCIDInternal.h"
#include "nsUnicharInputStream.h"
#include "nsContentUtils.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/IntegerTypeTraits.h"
#include "mozilla/NullPrincipal.h"
#include "mozilla/Telemetry.h"
#include "mozilla/TelemetryComms.h"
#include "mozilla/Logging.h"
using mozilla::fallible;
using mozilla::LogLevel;
using mozilla::MakeStringSpan;
using mozilla::dom::Document;
#define kExpatSeparatorChar 0xFFFF
static const char16_t kUTF16[] = {'U', 'T', 'F', '-', '1', '6', '\0'};
static mozilla::LazyLogModule gExpatDriverLog("expatdriver");
// Use the same maximum tree depth as Chromium (see
// https://chromium.googlesource.com/chromium/src/+/f464165c1dedff1c955d3c051c5a9a1c6a0e8f6b/third_party/WebKit/Source/core/xml/parser/XMLDocumentParser.cpp#85).
static const uint16_t sMaxXMLTreeDepth = 5000;
/***************************** EXPAT CALL BACKS ******************************/
// The callback handlers that get called from the expat parser.
static void Driver_HandleXMLDeclaration(void* aUserData,
const XML_Char* aVersion,
const XML_Char* aEncoding,
int aStandalone) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
nsExpatDriver* driver = static_cast<nsExpatDriver*>(aUserData);
driver->HandleXMLDeclaration(aVersion, aEncoding, aStandalone);
}
}
static void Driver_HandleCharacterData(void* aUserData, const XML_Char* aData,
int aLength) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
nsExpatDriver* driver = static_cast<nsExpatDriver*>(aUserData);
driver->HandleCharacterData(aData, uint32_t(aLength));
}
}
static void Driver_HandleComment(void* aUserData, const XML_Char* aName) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
static_cast<nsExpatDriver*>(aUserData)->HandleComment(aName);
}
}
static void Driver_HandleProcessingInstruction(void* aUserData,
const XML_Char* aTarget,
const XML_Char* aData) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
nsExpatDriver* driver = static_cast<nsExpatDriver*>(aUserData);
driver->HandleProcessingInstruction(aTarget, aData);
}
}
static void Driver_HandleDefault(void* aUserData, const XML_Char* aData,
int aLength) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
nsExpatDriver* driver = static_cast<nsExpatDriver*>(aUserData);
driver->HandleDefault(aData, uint32_t(aLength));
}
}
static void Driver_HandleStartCdataSection(void* aUserData) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
static_cast<nsExpatDriver*>(aUserData)->HandleStartCdataSection();
}
}
static void Driver_HandleEndCdataSection(void* aUserData) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
static_cast<nsExpatDriver*>(aUserData)->HandleEndCdataSection();
}
}
static void Driver_HandleStartDoctypeDecl(void* aUserData,
const XML_Char* aDoctypeName,
const XML_Char* aSysid,
const XML_Char* aPubid,
int aHasInternalSubset) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
static_cast<nsExpatDriver*>(aUserData)->HandleStartDoctypeDecl(
aDoctypeName, aSysid, aPubid, !!aHasInternalSubset);
}
}
static void Driver_HandleEndDoctypeDecl(void* aUserData) {
NS_ASSERTION(aUserData, "expat driver should exist");
if (aUserData) {
static_cast<nsExpatDriver*>(aUserData)->HandleEndDoctypeDecl();
}
}
static int Driver_HandleExternalEntityRef(void* aExternalEntityRefHandler,
const XML_Char* aOpenEntityNames,
const XML_Char* aBase,
const XML_Char* aSystemId,
const XML_Char* aPublicId) {
NS_ASSERTION(aExternalEntityRefHandler, "expat driver should exist");
if (!aExternalEntityRefHandler) {
return 1;
}
nsExpatDriver* driver =
static_cast<nsExpatDriver*>(aExternalEntityRefHandler);
return driver->HandleExternalEntityRef(aOpenEntityNames, aBase, aSystemId,
aPublicId);
}
/***************************** END CALL BACKS ********************************/
/***************************** CATALOG UTILS *********************************/
// Initially added for bug 113400 to switch from the remote "XHTML 1.0 plus
// MathML 2.0" DTD to the the lightweight customized version that Mozilla uses.
// Since Mozilla is not validating, no need to fetch a *huge* file at each
// click.
// XXX The cleanest solution here would be to fix Bug 98413: Implement XML
// Catalogs.
struct nsCatalogData {
const char* mPublicID;
const char* mLocalDTD;
const char* mAgentSheet;
};
// The order of this table is guestimated to be in the optimum order
static const nsCatalogData kCatalogTable[] = {
{"-//W3C//DTD XHTML 1.0 Transitional//EN", "htmlmathml-f.ent", nullptr},
{"-//W3C//DTD XHTML 1.1//EN", "htmlmathml-f.ent", nullptr},
{"-//W3C//DTD XHTML 1.0 Strict//EN", "htmlmathml-f.ent", nullptr},
{"-//W3C//DTD XHTML 1.0 Frameset//EN", "htmlmathml-f.ent", nullptr},
{"-//W3C//DTD XHTML Basic 1.0//EN", "htmlmathml-f.ent", nullptr},
{"-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN", "htmlmathml-f.ent", nullptr},
{"-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN",
"htmlmathml-f.ent", nullptr},
{"-//W3C//DTD MathML 2.0//EN", "htmlmathml-f.ent", nullptr},
{"-//WAPFORUM//DTD XHTML Mobile 1.0//EN", "htmlmathml-f.ent", nullptr},
{nullptr, nullptr, nullptr}};
static const nsCatalogData* LookupCatalogData(const char16_t* aPublicID) {
nsDependentString publicID(aPublicID);
// linear search for now since the number of entries is going to
// be negligible, and the fix for bug 98413 would get rid of this
// code anyway
const nsCatalogData* data = kCatalogTable;
while (data->mPublicID) {
if (publicID.EqualsASCII(data->mPublicID)) {
return data;
}
++data;
}
return nullptr;
}
// This function provides a resource URI to a local DTD
// in resource://gre/res/dtd/ which may or may not exist.
// If aCatalogData is provided, it is used to remap the
// DTD instead of taking the filename from the URI. aDTD
// may be null in some cases that are relying on
// aCatalogData working for them.
static void GetLocalDTDURI(const nsCatalogData* aCatalogData, nsIURI* aDTD,
nsIURI** aResult) {
nsAutoCString fileName;
if (aCatalogData) {
// remap the DTD to a known local DTD
fileName.Assign(aCatalogData->mLocalDTD);
}
if (fileName.IsEmpty()) {
// Try to see if the user has installed the DTD file -- we extract the
// filename.ext of the DTD here. Hence, for any DTD for which we have
// no predefined mapping, users just have to copy the DTD file to our
// special DTD directory and it will be picked.
nsCOMPtr<nsIURL> dtdURL = do_QueryInterface(aDTD);
if (!dtdURL) {
// Not a URL with a filename, or maybe it was null. Either way, nothing
// else we can do here.
return;
}
dtdURL->GetFileName(fileName);
if (fileName.IsEmpty()) {
return;
}
}
nsAutoCString respath("resource://gre/res/dtd/");
respath += fileName;
NS_NewURI(aResult, respath);
}
/***************************** END CATALOG UTILS *****************************/
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsExpatDriver)
NS_INTERFACE_MAP_ENTRY(nsITokenizer)
NS_INTERFACE_MAP_ENTRY(nsIDTD)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDTD)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsExpatDriver)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsExpatDriver)
NS_IMPL_CYCLE_COLLECTION(nsExpatDriver, mSink)
nsExpatDriver::nsExpatDriver()
: mExpatParser(nullptr),
mInCData(false),
mInInternalSubset(false),
mInExternalDTD(false),
mMadeFinalCallToExpat(false),
mIsFinalChunk(false),
mInternalState(NS_OK),
mExpatBuffered(0),
mTagDepth(0),
mCatalogData(nullptr),
mInnerWindowID(0) {}
nsExpatDriver::~nsExpatDriver() {
if (mExpatParser) {
XML_ParserFree(mExpatParser);
}
}
/* static */
void nsExpatDriver::HandleStartElement(void* aUserData, const char16_t* aName,
const char16_t** aAtts) {
nsExpatDriver* self = static_cast<nsExpatDriver*>(aUserData);
NS_ASSERTION(self->mSink, "content sink not found!");
// Calculate the total number of elements in aAtts.
// XML_GetSpecifiedAttributeCount will only give us the number of specified
// attrs (twice that number, actually), so we have to check for default attrs
// ourselves.
uint32_t attrArrayLength;
for (attrArrayLength = XML_GetSpecifiedAttributeCount(self->mExpatParser);
aAtts[attrArrayLength]; attrArrayLength += 2) {
// Just looping till we find out what the length is
}
if (self->mSink) {
// We store the tagdepth in a PRUint16, so make sure the limit fits in a
// PRUint16.
static_assert(
sMaxXMLTreeDepth <=
std::numeric_limits<decltype(nsExpatDriver::mTagDepth)>::max());
if (++self->mTagDepth > sMaxXMLTreeDepth) {
self->MaybeStopParser(NS_ERROR_HTMLPARSER_HIERARCHYTOODEEP);
return;
}
nsresult rv = self->mSink->HandleStartElement(
aName, aAtts, attrArrayLength,
XML_GetCurrentLineNumber(self->mExpatParser),
XML_GetCurrentColumnNumber(self->mExpatParser));
self->MaybeStopParser(rv);
}
}
/* static */
void nsExpatDriver::HandleStartElementForSystemPrincipal(
void* aUserData, const char16_t* aName, const char16_t** aAtts) {
nsExpatDriver* self = static_cast<nsExpatDriver*>(aUserData);
if (!MOZ_XML_ProcessingEntityValue(self->mExpatParser)) {
HandleStartElement(aUserData, aName, aAtts);
} else {
nsCOMPtr<Document> doc =
do_QueryInterface(self->mOriginalSink->GetTarget());
// Adjust the column number so that it is one based rather than zero based.
uint32_t colNumber = XML_GetCurrentColumnNumber(self->mExpatParser) + 1;
uint32_t lineNumber = XML_GetCurrentLineNumber(self->mExpatParser);
int32_t nameSpaceID;
RefPtr<nsAtom> prefix, localName;
nsContentUtils::SplitExpatName(aName, getter_AddRefs(prefix),
getter_AddRefs(localName), &nameSpaceID);
nsAutoString error;
error.AppendLiteral("Ignoring element <");
if (prefix) {
error.Append(prefix->GetUTF16String());
error.Append(':');
}
error.Append(localName->GetUTF16String());
error.AppendLiteral("> created from entity value.");
nsContentUtils::ReportToConsoleNonLocalized(
error, nsIScriptError::warningFlag, "XML Document"_ns, doc, nullptr,
EmptyString(), lineNumber, colNumber);
}
}
/* static */
void nsExpatDriver::HandleEndElement(void* aUserData, const char16_t* aName) {
nsExpatDriver* self = static_cast<nsExpatDriver*>(aUserData);
NS_ASSERTION(self->mSink, "content sink not found!");
NS_ASSERTION(self->mInternalState != NS_ERROR_HTMLPARSER_BLOCK,
"Shouldn't block from HandleStartElement.");
if (self->mSink && self->mInternalState != NS_ERROR_HTMLPARSER_STOPPARSING) {
nsresult rv = self->mSink->HandleEndElement(aName);
--self->mTagDepth;
self->MaybeStopParser(rv);
}
}
/* static */
void nsExpatDriver::HandleEndElementForSystemPrincipal(void* aUserData,
const char16_t* aName) {
nsExpatDriver* self = static_cast<nsExpatDriver*>(aUserData);
if (!MOZ_XML_ProcessingEntityValue(self->mExpatParser)) {
HandleEndElement(aUserData, aName);
}
}
nsresult nsExpatDriver::HandleCharacterData(const char16_t* aValue,
const uint32_t aLength) {
NS_ASSERTION(mSink, "content sink not found!");
if (mInCData) {
if (!mCDataText.Append(aValue, aLength, fallible)) {
MaybeStopParser(NS_ERROR_OUT_OF_MEMORY);
}
} else if (mSink) {
nsresult rv = mSink->HandleCharacterData(aValue, aLength);
MaybeStopParser(rv);
}
return NS_OK;
}
nsresult nsExpatDriver::HandleComment(const char16_t* aValue) {
NS_ASSERTION(mSink, "content sink not found!");
if (mInExternalDTD) {
// Ignore comments from external DTDs
return NS_OK;
}
if (mInInternalSubset) {
mInternalSubset.AppendLiteral("<!--");
mInternalSubset.Append(aValue);
mInternalSubset.AppendLiteral("-->");
} else if (mSink) {
nsresult rv = mSink->HandleComment(aValue);
MaybeStopParser(rv);
}
return NS_OK;
}
nsresult nsExpatDriver::HandleProcessingInstruction(const char16_t* aTarget,
const char16_t* aData) {
NS_ASSERTION(mSink, "content sink not found!");
if (mInExternalDTD) {
// Ignore PIs in external DTDs for now. Eventually we want to
// pass them to the sink in a way that doesn't put them in the DOM
return NS_OK;
}
if (mInInternalSubset) {
mInternalSubset.AppendLiteral("<?");
mInternalSubset.Append(aTarget);
mInternalSubset.Append(' ');
mInternalSubset.Append(aData);
mInternalSubset.AppendLiteral("?>");
} else if (mSink) {
nsresult rv = mSink->HandleProcessingInstruction(aTarget, aData);
MaybeStopParser(rv);
}
return NS_OK;
}
nsresult nsExpatDriver::HandleXMLDeclaration(const char16_t* aVersion,
const char16_t* aEncoding,
int32_t aStandalone) {
if (mSink) {
nsresult rv = mSink->HandleXMLDeclaration(aVersion, aEncoding, aStandalone);
MaybeStopParser(rv);
}
return NS_OK;
}
nsresult nsExpatDriver::HandleDefault(const char16_t* aValue,
const uint32_t aLength) {
NS_ASSERTION(mSink, "content sink not found!");
if (mInExternalDTD) {
// Ignore newlines in external DTDs
return NS_OK;
}
if (mInInternalSubset) {
mInternalSubset.Append(aValue, aLength);
} else if (mSink) {
uint32_t i;
nsresult rv = mInternalState;
for (i = 0; i < aLength && NS_SUCCEEDED(rv); ++i) {
if (aValue[i] == '\n' || aValue[i] == '\r') {
rv = mSink->HandleCharacterData(&aValue[i], 1);
}
}
MaybeStopParser(rv);
}
return NS_OK;
}
nsresult nsExpatDriver::HandleStartCdataSection() {
mInCData = true;
return NS_OK;
}
nsresult nsExpatDriver::HandleEndCdataSection() {
NS_ASSERTION(mSink, "content sink not found!");
mInCData = false;
if (mSink) {
nsresult rv =
mSink->HandleCDataSection(mCDataText.get(), mCDataText.Length());
MaybeStopParser(rv);
}
mCDataText.Truncate();
return NS_OK;
}
nsresult nsExpatDriver::HandleStartDoctypeDecl(const char16_t* aDoctypeName,
const char16_t* aSysid,
const char16_t* aPubid,
bool aHasInternalSubset) {
mDoctypeName = aDoctypeName;
mSystemID = aSysid;
mPublicID = aPubid;
if (aHasInternalSubset) {
// Consuming a huge internal subset translates to numerous
// allocations. In an effort to avoid too many allocations
// setting mInternalSubset's capacity to be 1K ( just a guesstimate! ).
mInInternalSubset = true;
mInternalSubset.SetCapacity(1024);
} else {
// Distinguish missing internal subset from an empty one
mInternalSubset.SetIsVoid(true);
}
return NS_OK;
}
nsresult nsExpatDriver::HandleEndDoctypeDecl() {
NS_ASSERTION(mSink, "content sink not found!");
mInInternalSubset = false;
if (mSink) {
// let the sink know any additional knowledge that we have about the
// document (currently, from bug 124570, we only expect to pass additional
// agent sheets needed to layout the XML vocabulary of the document)
nsCOMPtr<nsIURI> data;
#if 0
if (mCatalogData && mCatalogData->mAgentSheet) {
NS_NewURI(getter_AddRefs(data), mCatalogData->mAgentSheet);
}
#endif
// The unused support for "catalog style sheets" was removed. It doesn't
// look like we'll ever fix bug 98413 either.
MOZ_ASSERT(!mCatalogData || !mCatalogData->mAgentSheet,
"Need to add back support for catalog style sheets");
// Note: mInternalSubset already doesn't include the [] around it.
nsresult rv = mSink->HandleDoctypeDecl(mInternalSubset, mDoctypeName,
mSystemID, mPublicID, data);
MaybeStopParser(rv);
}
mInternalSubset.Truncate();
return NS_OK;
}
static nsresult ExternalDTDStreamReaderFunc(nsIUnicharInputStream* aIn,
void* aClosure,
const char16_t* aFromSegment,
uint32_t aToOffset, uint32_t aCount,
uint32_t* aWriteCount) {
// Pass the buffer to expat for parsing.
if (XML_Parse((XML_Parser)aClosure, (const char*)aFromSegment,
aCount * sizeof(char16_t), 0) == XML_STATUS_OK) {
*aWriteCount = aCount;
return NS_OK;
}
*aWriteCount = 0;
return NS_ERROR_FAILURE;
}
int nsExpatDriver::HandleExternalEntityRef(const char16_t* openEntityNames,
const char16_t* base,
const char16_t* systemId,
const char16_t* publicId) {
if (mInInternalSubset && !mInExternalDTD && openEntityNames) {
mInternalSubset.Append(char16_t('%'));
mInternalSubset.Append(nsDependentString(openEntityNames));
mInternalSubset.Append(char16_t(';'));
}
// Load the external entity into a buffer.
nsCOMPtr<nsIInputStream> in;
nsAutoString absURL;
nsresult rv = OpenInputStreamFromExternalDTD(publicId, systemId, base,
getter_AddRefs(in), absURL);
if (NS_FAILED(rv)) {
#ifdef DEBUG
nsCString message("Failed to open external DTD: publicId \"");
AppendUTF16toUTF8(MakeStringSpan(publicId), message);
message += "\" systemId \"";
AppendUTF16toUTF8(MakeStringSpan(systemId), message);
message += "\" base \"";
AppendUTF16toUTF8(MakeStringSpan(base), message);
message += "\" URL \"";
AppendUTF16toUTF8(absURL, message);
message += "\"";
NS_WARNING(message.get());
#endif
return 1;
}
nsCOMPtr<nsIUnicharInputStream> uniIn;
rv = NS_NewUnicharInputStream(in, getter_AddRefs(uniIn));
NS_ENSURE_SUCCESS(rv, 1);
int result = 1;
if (uniIn) {
XML_Parser entParser =
XML_ExternalEntityParserCreate(mExpatParser, 0, kUTF16);
if (entParser) {
XML_SetBase(entParser, absURL.get());
mInExternalDTD = true;
uint32_t totalRead;
do {
rv = uniIn->ReadSegments(ExternalDTDStreamReaderFunc, entParser,
uint32_t(-1), &totalRead);
} while (NS_SUCCEEDED(rv) && totalRead > 0);
result = XML_Parse(entParser, nullptr, 0, 1);
mInExternalDTD = false;
XML_ParserFree(entParser);
}
}
return result;
}
nsresult nsExpatDriver::OpenInputStreamFromExternalDTD(const char16_t* aFPIStr,
const char16_t* aURLStr,
const char16_t* aBaseURL,
nsIInputStream** aStream,
nsAString& aAbsURL) {
nsCOMPtr<nsIURI> baseURI;
nsresult rv =
NS_NewURI(getter_AddRefs(baseURI), NS_ConvertUTF16toUTF8(aBaseURL));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIURI> uri;
rv = NS_NewURI(getter_AddRefs(uri), NS_ConvertUTF16toUTF8(aURLStr), nullptr,
baseURI);
// Even if the URI is malformed (most likely because we have a
// non-hierarchical base URI and a relative DTD URI, with the latter
// being the normal XHTML DTD case), we can try to see whether we
// have catalog data for aFPIStr.
if (NS_WARN_IF(NS_FAILED(rv) && rv != NS_ERROR_MALFORMED_URI)) {
return rv;
}
// make sure the URI, if we have one, is allowed to be loaded in sync
bool isUIResource = false;
if (uri) {
rv = NS_URIChainHasFlags(uri, nsIProtocolHandler::URI_IS_UI_RESOURCE,
&isUIResource);
NS_ENSURE_SUCCESS(rv, rv);
}
nsCOMPtr<nsIURI> localURI;
if (!isUIResource) {
// Check to see if we can map the DTD to a known local DTD, or if a DTD
// file of the same name exists in the special DTD directory
if (aFPIStr) {
// see if the Formal Public Identifier (FPI) maps to a catalog entry
mCatalogData = LookupCatalogData(aFPIStr);
GetLocalDTDURI(mCatalogData, uri, getter_AddRefs(localURI));
}
if (!localURI) {
return NS_ERROR_NOT_IMPLEMENTED;
}
}
nsCOMPtr<nsIChannel> channel;
if (localURI) {
localURI.swap(uri);
rv = NS_NewChannel(getter_AddRefs(channel), uri,
nsContentUtils::GetSystemPrincipal(),
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL,
nsIContentPolicy::TYPE_DTD);
NS_ENSURE_SUCCESS(rv, rv);
} else {
NS_ASSERTION(
mSink == nsCOMPtr<nsIExpatSink>(do_QueryInterface(mOriginalSink)),
"In nsExpatDriver::OpenInputStreamFromExternalDTD: "
"mOriginalSink not the same object as mSink?");
nsContentPolicyType policyType = nsIContentPolicy::TYPE_INTERNAL_DTD;
if (mOriginalSink) {
nsCOMPtr<Document> doc;
doc = do_QueryInterface(mOriginalSink->GetTarget());
if (doc) {
if (doc->SkipDTDSecurityChecks()) {
policyType = nsIContentPolicy::TYPE_INTERNAL_FORCE_ALLOWED_DTD;
}
rv = NS_NewChannel(
getter_AddRefs(channel), uri, doc,
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_INHERITS_SEC_CONTEXT |
nsILoadInfo::SEC_ALLOW_CHROME,
policyType);
NS_ENSURE_SUCCESS(rv, rv);
}
}
if (!channel) {
nsCOMPtr<nsIPrincipal> nullPrincipal =
mozilla::NullPrincipal::CreateWithoutOriginAttributes();
rv = NS_NewChannel(
getter_AddRefs(channel), uri, nullPrincipal,
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_INHERITS_SEC_CONTEXT |
nsILoadInfo::SEC_ALLOW_CHROME,
policyType);
NS_ENSURE_SUCCESS(rv, rv);
}
}
nsAutoCString absURL;
rv = uri->GetSpec(absURL);
NS_ENSURE_SUCCESS(rv, rv);
CopyUTF8toUTF16(absURL, aAbsURL);
channel->SetContentType("application/xml"_ns);
return channel->Open(aStream);
}
static nsresult CreateErrorText(const char16_t* aDescription,
const char16_t* aSourceURL,
const uint32_t aLineNumber,
const uint32_t aColNumber,
nsString& aErrorString, bool spoofEnglish) {
aErrorString.Truncate();
nsAutoString msg;
nsresult rv = nsParserMsgUtils::GetLocalizedStringByName(
spoofEnglish ? XMLPARSER_PROPERTIES_en_US : XMLPARSER_PROPERTIES,
"XMLParsingError", msg);
NS_ENSURE_SUCCESS(rv, rv);
// XML Parsing Error: %1$S\nLocation: %2$S\nLine Number %3$u, Column %4$u:
nsTextFormatter::ssprintf(aErrorString, msg.get(), aDescription, aSourceURL,
aLineNumber, aColNumber);
return NS_OK;
}
static nsresult AppendErrorPointer(const int32_t aColNumber,
const char16_t* aSourceLine,
nsString& aSourceString) {
aSourceString.Append(char16_t('\n'));
// Last character will be '^'.
int32_t last = aColNumber - 1;
int32_t i;
uint32_t minuses = 0;
for (i = 0; i < last; ++i) {
if (aSourceLine[i] == '\t') {
// Since this uses |white-space: pre;| a tab stop equals 8 spaces.
uint32_t add = 8 - (minuses % 8);
aSourceString.AppendASCII("--------", add);
minuses += add;
} else {
aSourceString.Append(char16_t('-'));
++minuses;
}
}
aSourceString.Append(char16_t('^'));
return NS_OK;
}
nsresult nsExpatDriver::HandleError() {
int32_t code = XML_GetErrorCode(mExpatParser);
NS_ASSERTION(code > XML_ERROR_NONE, "unexpected XML error code");
// Map Expat error code to an error string
// XXX Deal with error returns.
nsAutoString description;
nsCOMPtr<Document> doc;
if (mOriginalSink) {
doc = do_QueryInterface(mOriginalSink->GetTarget());
}
if (doc && nsContentUtils::IsChromeDoc(doc)) {
nsCString path = doc->GetDocumentURI()->GetSpecOrDefault();
mozilla::Telemetry::SetEventRecordingEnabled("ysod"_ns, true);
mozilla::Telemetry::RecordEvent(
mozilla::Telemetry::EventID::Ysod_Shown_Ysod, mozilla::Some(path),
mozilla::Nothing());
}
bool spoofEnglish =
nsContentUtils::SpoofLocaleEnglish() && (!doc || !doc->AllowsL10n());
nsParserMsgUtils::GetLocalizedStringByID(
spoofEnglish ? XMLPARSER_PROPERTIES_en_US : XMLPARSER_PROPERTIES, code,
description);
if (code == XML_ERROR_TAG_MISMATCH) {
/**
* Expat can send the following:
* localName
* namespaceURI<separator>localName
* namespaceURI<separator>localName<separator>prefix
*
* and we use 0xFFFF for the <separator>.
*
*/
const char16_t* mismatch = MOZ_XML_GetMismatchedTag(mExpatParser);
const char16_t* uriEnd = nullptr;
const char16_t* nameEnd = nullptr;
const char16_t* pos;
for (pos = mismatch; *pos; ++pos) {
if (*pos == kExpatSeparatorChar) {
if (uriEnd) {
nameEnd = pos;
} else {
uriEnd = pos;
}
}
}
nsAutoString tagName;
if (uriEnd && nameEnd) {
// We have a prefix.
tagName.Append(nameEnd + 1, pos - nameEnd - 1);
tagName.Append(char16_t(':'));
}
const char16_t* nameStart = uriEnd ? uriEnd + 1 : mismatch;
tagName.Append(nameStart, (nameEnd ? nameEnd : pos) - nameStart);
nsAutoString msg;
nsParserMsgUtils::GetLocalizedStringByName(
spoofEnglish ? XMLPARSER_PROPERTIES_en_US : XMLPARSER_PROPERTIES,
"Expected", msg);
// . Expected: </%S>.
nsAutoString message;
nsTextFormatter::ssprintf(message, msg.get(), tagName.get());
description.Append(message);
}
// Adjust the column number so that it is one based rather than zero based.
uint32_t colNumber = XML_GetCurrentColumnNumber(mExpatParser) + 1;
uint32_t lineNumber = XML_GetCurrentLineNumber(mExpatParser);
nsAutoString errorText;
CreateErrorText(description.get(), XML_GetBase(mExpatParser), lineNumber,
colNumber, errorText, spoofEnglish);
nsAutoString sourceText(mLastLine);
AppendErrorPointer(colNumber, mLastLine.get(), sourceText);
// Try to create and initialize the script error.
nsCOMPtr<nsIScriptError> serr(do_CreateInstance(NS_SCRIPTERROR_CONTRACTID));
nsresult rv = NS_ERROR_FAILURE;
if (serr) {
rv = serr->InitWithWindowID(errorText, mURISpec, mLastLine, lineNumber,
colNumber, nsIScriptError::errorFlag,
"malformed-xml", mInnerWindowID);
}
// If it didn't initialize, we can't do any logging.
bool shouldReportError = NS_SUCCEEDED(rv);
// mSink might be null here if our parser was terminated.
if (mSink && shouldReportError) {
rv = mSink->ReportError(errorText.get(), sourceText.get(), serr,
&shouldReportError);
if (NS_FAILED(rv)) {
shouldReportError = true;
}
}
// mOriginalSink might be null here if our parser was terminated.
if (mOriginalSink) {
nsCOMPtr<Document> doc = do_QueryInterface(mOriginalSink->GetTarget());
if (doc && doc->SuppressParserErrorConsoleMessages()) {
shouldReportError = false;
}
}
if (shouldReportError) {
nsCOMPtr<nsIConsoleService> cs(do_GetService(NS_CONSOLESERVICE_CONTRACTID));
if (cs) {
cs->LogMessage(serr);
}
}
return NS_ERROR_HTMLPARSER_STOPPARSING;
}
void nsExpatDriver::ParseBuffer(const char16_t* aBuffer, uint32_t aLength,
bool aIsFinal, uint32_t* aConsumed) {
NS_ASSERTION((aBuffer && aLength != 0) || (!aBuffer && aLength == 0), "?");
NS_ASSERTION(mInternalState != NS_OK || aIsFinal || aBuffer,
"Useless call, we won't call Expat");
MOZ_ASSERT(!BlockedOrInterrupted() || !aBuffer,
"Non-null buffer when resuming");
MOZ_ASSERT(XML_GetCurrentByteIndex(mExpatParser) % sizeof(char16_t) == 0,
"Consumed part of a char16_t?");
if (mExpatParser && (mInternalState == NS_OK || BlockedOrInterrupted())) {
int32_t parserBytesBefore = XML_GetCurrentByteIndex(mExpatParser);
NS_ASSERTION(parserBytesBefore >= 0, "Unexpected value");
XML_Status status;
if (BlockedOrInterrupted()) {
mInternalState = NS_OK; // Resume in case we're blocked.
status = XML_ResumeParser(mExpatParser);
} else {
status = XML_Parse(mExpatParser, reinterpret_cast<const char*>(aBuffer),
aLength * sizeof(char16_t), aIsFinal);
}
int32_t parserBytesConsumed = XML_GetCurrentByteIndex(mExpatParser);
NS_ASSERTION(parserBytesConsumed >= 0, "Unexpected value");
NS_ASSERTION(parserBytesConsumed >= parserBytesBefore,
"How'd this happen?");
NS_ASSERTION(parserBytesConsumed % sizeof(char16_t) == 0,
"Consumed part of a char16_t?");
// Consumed something.
*aConsumed = (parserBytesConsumed - parserBytesBefore) / sizeof(char16_t);
NS_ASSERTION(*aConsumed <= aLength + mExpatBuffered,
"Too many bytes consumed?");
NS_ASSERTION(status != XML_STATUS_SUSPENDED || BlockedOrInterrupted(),
"Inconsistent expat suspension state.");
if (status == XML_STATUS_ERROR) {
mInternalState = NS_ERROR_HTMLPARSER_STOPPARSING;
}
} else {
*aConsumed = 0;
}
}
NS_IMETHODIMP
nsExpatDriver::ConsumeToken(nsScanner& aScanner, bool& aFlushTokens) {
// We keep the scanner pointing to the position where Expat will start
// parsing.
nsScannerIterator currentExpatPosition;
aScanner.CurrentPosition(currentExpatPosition);
// This is the start of the first buffer that we need to pass to Expat.
nsScannerIterator start = currentExpatPosition;
start.advance(mExpatBuffered);
// This is the end of the last buffer (at this point, more data could come in
// later).
nsScannerIterator end;
aScanner.EndReading(end);
MOZ_LOG(gExpatDriverLog, LogLevel::Debug,
("Remaining in expat's buffer: %i, remaining in scanner: %zu.",
mExpatBuffered, Distance(start, end)));
// We want to call Expat if we have more buffers, or if we know there won't
// be more buffers (and so we want to flush the remaining data), or if we're
// currently blocked and there's data in Expat's buffer.
while (start != end || (mIsFinalChunk && !mMadeFinalCallToExpat) ||
(BlockedOrInterrupted() && mExpatBuffered > 0)) {
bool noMoreBuffers = start == end && mIsFinalChunk;
bool blocked = BlockedOrInterrupted();
const char16_t* buffer;
uint32_t length;
if (blocked || noMoreBuffers) {
// If we're blocked we just resume Expat so we don't need a buffer, if
// there aren't any more buffers we pass a null buffer to Expat.
buffer = nullptr;
length = 0;
if (blocked) {
MOZ_LOG(
gExpatDriverLog, LogLevel::Debug,
("Resuming Expat, will parse data remaining in Expat's "
"buffer.\nContent of Expat's buffer:\n-----\n%s\n-----\n",
NS_ConvertUTF16toUTF8(currentExpatPosition.get(), mExpatBuffered)
.get()));
} else {
NS_ASSERTION(mExpatBuffered == Distance(currentExpatPosition, end),
"Didn't pass all the data to Expat?");
MOZ_LOG(
gExpatDriverLog, LogLevel::Debug,
("Last call to Expat, will parse data remaining in Expat's "
"buffer.\nContent of Expat's buffer:\n-----\n%s\n-----\n",
NS_ConvertUTF16toUTF8(currentExpatPosition.get(), mExpatBuffered)
.get()));
}
} else {
buffer = start.get();
length = uint32_t(start.size_forward());
MOZ_LOG(gExpatDriverLog, LogLevel::Debug,
("Calling Expat, will parse data remaining in Expat's buffer and "
"new data.\nContent of Expat's buffer:\n-----\n%s\n-----\nNew "
"data:\n-----\n%s\n-----\n",
NS_ConvertUTF16toUTF8(currentExpatPosition.get(), mExpatBuffered)
.get(),
NS_ConvertUTF16toUTF8(start.get(), length).get()));
}
uint32_t consumed;
ParseBuffer(buffer, length, noMoreBuffers, &consumed);
if (consumed > 0) {
nsScannerIterator oldExpatPosition = currentExpatPosition;
currentExpatPosition.advance(consumed);
// We consumed some data, we want to store the last line of data that
// was consumed in case we run into an error (to show the line in which
// the error occurred).
// The length of the last line that Expat has parsed.
XML_Size lastLineLength = XML_GetCurrentColumnNumber(mExpatParser);
if (lastLineLength <= consumed) {
// The length of the last line was less than what expat consumed, so
// there was at least one line break in the consumed data. Store the
// last line until the point where we stopped parsing.
nsScannerIterator startLastLine = currentExpatPosition;
startLastLine.advance(-((ptrdiff_t)lastLineLength));
if (!CopyUnicodeTo(startLastLine, currentExpatPosition, mLastLine)) {
return (mInternalState = NS_ERROR_OUT_OF_MEMORY);
}
} else {
// There was no line break in the consumed data, append the consumed
// data.
if (!AppendUnicodeTo(oldExpatPosition, currentExpatPosition,
mLastLine)) {
return (mInternalState = NS_ERROR_OUT_OF_MEMORY);
}
}
}
mExpatBuffered += length - consumed;
if (BlockedOrInterrupted()) {
MOZ_LOG(gExpatDriverLog, LogLevel::Debug,
("Blocked or interrupted parser (probably for loading linked "
"stylesheets or scripts)."));
aScanner.SetPosition(currentExpatPosition, true);
aScanner.Mark();
return mInternalState;
}
if (noMoreBuffers && mExpatBuffered == 0) {
mMadeFinalCallToExpat = true;
}
if (NS_FAILED(mInternalState)) {
if (XML_GetErrorCode(mExpatParser) != XML_ERROR_NONE) {
NS_ASSERTION(mInternalState == NS_ERROR_HTMLPARSER_STOPPARSING,
"Unexpected error");
// Look for the next newline after the last one we consumed
nsScannerIterator lastLine = currentExpatPosition;
while (lastLine != end) {
length = uint32_t(lastLine.size_forward());
uint32_t endOffset = 0;
const char16_t* buffer = lastLine.get();
while (endOffset < length && buffer[endOffset] != '\n' &&
buffer[endOffset] != '\r') {
++endOffset;
}
mLastLine.Append(Substring(buffer, buffer + endOffset));
if (endOffset < length) {
// We found a newline.
break;
}
lastLine.advance(length);
}
HandleError();
}
return mInternalState;
}
// Either we have more buffers, or we were blocked (and we'll flush in the
// next iteration), or we should have emptied Expat's buffer.
NS_ASSERTION(!noMoreBuffers || blocked ||
(mExpatBuffered == 0 && currentExpatPosition == end),
"Unreachable data left in Expat's buffer");
start.advance(length);
// It's possible for start to have passed end if we received more data
// (e.g. if we spun the event loop in an inline script). Reload end now
// to compensate.
aScanner.EndReading(end);
}
aScanner.SetPosition(currentExpatPosition, true);
aScanner.Mark();
MOZ_LOG(gExpatDriverLog, LogLevel::Debug,
("Remaining in expat's buffer: %i, remaining in scanner: %zu.",
mExpatBuffered, Distance(currentExpatPosition, end)));
return NS_SUCCEEDED(mInternalState) ? NS_ERROR_HTMLPARSER_EOF : NS_OK;
}
NS_IMETHODIMP
nsExpatDriver::WillBuildModel(const CParserContext& aParserContext,
nsITokenizer* aTokenizer, nsIContentSink* aSink) {
mSink = do_QueryInterface(aSink);
if (!mSink) {
NS_ERROR("nsExpatDriver didn't get an nsIExpatSink");
// Make sure future calls to us bail out as needed
mInternalState = NS_ERROR_UNEXPECTED;
return mInternalState;
}
mOriginalSink = aSink;
static const XML_Memory_Handling_Suite memsuite = {malloc, realloc, free};
static const char16_t kExpatSeparator[] = {kExpatSeparatorChar, '\0'};
mExpatParser = XML_ParserCreate_MM(kUTF16, &memsuite, kExpatSeparator);
NS_ENSURE_TRUE(mExpatParser, NS_ERROR_FAILURE);
XML_SetReturnNSTriplet(mExpatParser, XML_TRUE);
#ifdef XML_DTD
XML_SetParamEntityParsing(mExpatParser, XML_PARAM_ENTITY_PARSING_ALWAYS);
#endif
mURISpec = aParserContext.mScanner->GetFilename();
XML_SetBase(mExpatParser, mURISpec.get());
nsCOMPtr<Document> doc = do_QueryInterface(mOriginalSink->GetTarget());
if (doc) {
nsCOMPtr<nsPIDOMWindowOuter> win = doc->GetWindow();
nsCOMPtr<nsPIDOMWindowInner> inner;
if (win) {
inner = win->GetCurrentInnerWindow();
} else {
bool aHasHadScriptHandlingObject;
nsIScriptGlobalObject* global =
doc->GetScriptHandlingObject(aHasHadScriptHandlingObject);
if (global) {
inner = do_QueryInterface(global);
}
}
if (inner) {
mInnerWindowID = inner->WindowID();
}
}
// Set up the callbacks
XML_SetXmlDeclHandler(mExpatParser, Driver_HandleXMLDeclaration);
if (doc && doc->NodePrincipal()->IsSystemPrincipal()) {
XML_SetElementHandler(mExpatParser, HandleStartElementForSystemPrincipal,
HandleEndElementForSystemPrincipal);
} else {
XML_SetElementHandler(mExpatParser, HandleStartElement, HandleEndElement);
}
XML_SetCharacterDataHandler(mExpatParser, Driver_HandleCharacterData);
XML_SetProcessingInstructionHandler(mExpatParser,
Driver_HandleProcessingInstruction);
XML_SetDefaultHandlerExpand(mExpatParser, Driver_HandleDefault);
XML_SetExternalEntityRefHandler(
mExpatParser,
(XML_ExternalEntityRefHandler)Driver_HandleExternalEntityRef);
XML_SetExternalEntityRefHandlerArg(mExpatParser, this);
XML_SetCommentHandler(mExpatParser, Driver_HandleComment);
XML_SetCdataSectionHandler(mExpatParser, Driver_HandleStartCdataSection,
Driver_HandleEndCdataSection);
XML_SetParamEntityParsing(mExpatParser,
XML_PARAM_ENTITY_PARSING_UNLESS_STANDALONE);
XML_SetDoctypeDeclHandler(mExpatParser, Driver_HandleStartDoctypeDecl,
Driver_HandleEndDoctypeDecl);
// Set up the user data.
XML_SetUserData(mExpatParser, this);
return mInternalState;
}
NS_IMETHODIMP
nsExpatDriver::BuildModel(nsITokenizer* aTokenizer, nsIContentSink* aSink) {
return mInternalState;
}
NS_IMETHODIMP
nsExpatDriver::DidBuildModel(nsresult anErrorCode) {
mOriginalSink = nullptr;
mSink = nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsExpatDriver::WillTokenize(bool aIsFinalChunk) {
mIsFinalChunk = aIsFinalChunk;
return NS_OK;
}
NS_IMETHODIMP_(void)
nsExpatDriver::Terminate() {
// XXX - not sure what happens to the unparsed data.
if (mExpatParser) {
XML_StopParser(mExpatParser, XML_FALSE);
}
mInternalState = NS_ERROR_HTMLPARSER_STOPPARSING;
}
NS_IMETHODIMP_(int32_t)
nsExpatDriver::GetType() { return NS_IPARSER_FLAG_XML; }
NS_IMETHODIMP_(nsDTDMode)
nsExpatDriver::GetMode() const { return eDTDMode_full_standards; }
/*************************** Unused methods **********************************/
NS_IMETHODIMP_(bool)
nsExpatDriver::IsContainer(int32_t aTag) const { return true; }
NS_IMETHODIMP_(bool)
nsExpatDriver::CanContain(int32_t aParent, int32_t aChild) const {
return true;
}
void nsExpatDriver::MaybeStopParser(nsresult aState) {
if (NS_FAILED(aState)) {
// If we had a failure we want to override NS_ERROR_HTMLPARSER_INTERRUPTED
// and we want to override NS_ERROR_HTMLPARSER_BLOCK but not with
// NS_ERROR_HTMLPARSER_INTERRUPTED.
if (NS_SUCCEEDED(mInternalState) ||
mInternalState == NS_ERROR_HTMLPARSER_INTERRUPTED ||
(mInternalState == NS_ERROR_HTMLPARSER_BLOCK &&
aState != NS_ERROR_HTMLPARSER_INTERRUPTED)) {
mInternalState = (aState == NS_ERROR_HTMLPARSER_INTERRUPTED ||
aState == NS_ERROR_HTMLPARSER_BLOCK)
? aState
: NS_ERROR_HTMLPARSER_STOPPARSING;
}
// If we get an error then we need to stop Expat (by calling XML_StopParser
// with false as the last argument). If the parser should be blocked or
// interrupted we need to pause Expat (by calling XML_StopParser with
// true as the last argument).
XML_StopParser(mExpatParser, BlockedOrInterrupted());
} else if (NS_SUCCEEDED(mInternalState)) {
// Only clobber mInternalState with the success code if we didn't block or
// interrupt before.
mInternalState = aState;
}
}
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