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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include "documentbuilder.hxx"
#include <string.h>
#include <libxml/xmlerror.h>
#include <memory>
#include <rtl/ustrbuf.hxx>
#include <osl/diagnose.h>
#include <sal/log.hxx>
#include <tools/diagnose_ex.h>
#include <comphelper/processfactory.hxx>
#include <cppuhelper/implbase.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <com/sun/star/xml/sax/SAXParseException.hpp>
#include <com/sun/star/ucb/XCommandEnvironment.hpp>
#include <com/sun/star/task/XInteractionHandler.hpp>
#include <com/sun/star/ucb/SimpleFileAccess.hpp>
#include <ucbhelper/content.hxx>
#include <ucbhelper/commandenvironment.hxx>
#include "document.hxx"
using namespace css::io;
using namespace css::lang;
using namespace css::ucb;
using namespace css::uno;
using namespace css::xml::dom;
using namespace css::xml::sax;
using namespace ucbhelper;
using css::task::XInteractionHandler;
using css::xml::sax::InputSource;
namespace DOM
{
namespace {
class CDefaultEntityResolver : public cppu::WeakImplHelper< XEntityResolver >
{
public:
virtual InputSource SAL_CALL resolveEntity( const OUString& sPublicId, const OUString& sSystemId ) override
{
InputSource is;
is.sPublicId = sPublicId;
is.sSystemId = sSystemId;
is.sEncoding.clear();
try {
Reference< XCommandEnvironment > aEnvironment(
new CommandEnvironment(Reference< XInteractionHandler >(),
Reference< XProgressHandler >() ));
Content aContent(sSystemId, aEnvironment, comphelper::getProcessComponentContext());
is.aInputStream = aContent.openStream();
} catch (const css::uno::Exception&) {
TOOLS_WARN_EXCEPTION( "unoxml", "exception in default entity resolver");
is.aInputStream.clear();
}
return is;
}
};
}
CDocumentBuilder::CDocumentBuilder()
: m_xEntityResolver(new CDefaultEntityResolver)
{
// init libxml. libxml will protect itself against multiple
// initializations so there is no problem here if this gets
// called multiple times.
xmlInitParser();
}
Sequence< OUString > SAL_CALL CDocumentBuilder::getSupportedServiceNames()
{
return { "com.sun.star.xml.dom.DocumentBuilder" };
}
OUString SAL_CALL CDocumentBuilder::getImplementationName()
{
return "com.sun.star.comp.xml.dom.DocumentBuilder";
}
sal_Bool SAL_CALL CDocumentBuilder::supportsService(const OUString& aServiceName)
{
return cppu::supportsService(this, aServiceName);
}
Reference< XDOMImplementation > SAL_CALL CDocumentBuilder::getDOMImplementation()
{
return Reference< XDOMImplementation >();
}
sal_Bool SAL_CALL CDocumentBuilder::isNamespaceAware()
{
return true;
}
sal_Bool SAL_CALL CDocumentBuilder::isValidating()
{
return false;
}
Reference< XDocument > SAL_CALL CDocumentBuilder::newDocument()
{
std::scoped_lock const g(m_Mutex);
// create a new document
xmlDocPtr pDocument = xmlNewDoc(reinterpret_cast<const xmlChar*>("1.0"));
return CDocument::CreateCDocument(pDocument);
}
static OUString make_error_message(xmlParserCtxtPtr ctxt)
{
return OUString(ctxt->lastError.message, strlen(ctxt->lastError.message), RTL_TEXTENCODING_ASCII_US) +
"Line: " +
OUString::number(static_cast<sal_Int32>(ctxt->lastError.line)) +
"\nColumn: " +
OUString::number(static_cast<sal_Int32>(ctxt->lastError.int2));
}
// -- callbacks and context struct for parsing from stream
// -- c-linkage, so the callbacks can be used by libxml
extern "C" {
namespace {
// context struct passed to IO functions
typedef struct context {
Reference< XInputStream > rInputStream;
bool close;
bool freeOnClose;
} context_t;
}
static int xmlIO_read_func( void *context, char *buffer, int len)
{
// get the context...
context_t *pctx = static_cast<context_t*>(context);
if (!pctx->rInputStream.is())
return -1;
try {
// try to read the requested number of bytes
Sequence< sal_Int8 > chunk(len);
int nread = pctx->rInputStream->readBytes(chunk, len);
// copy bytes to the provided buffer
memcpy(buffer, chunk.getConstArray(), nread);
return nread;
} catch (const css::uno::Exception&) {
TOOLS_WARN_EXCEPTION( "unoxml", "");
return -1;
}
}
static int xmlIO_close_func(void* context)
{
// get the context...
context_t *pctx = static_cast<context_t*>(context);
if (!pctx->rInputStream.is())
return 0;
try
{
if (pctx->close)
pctx->rInputStream->closeInput();
if (pctx->freeOnClose)
delete pctx;
return 0;
} catch (const css::uno::Exception&) {
TOOLS_WARN_EXCEPTION( "unoxml", "");
return -1;
}
}
static xmlParserInputPtr resolve_func(void *ctx,
const xmlChar *publicId,
const xmlChar *systemId)
{
// get the CDocumentBuilder object
xmlParserCtxtPtr ctxt = static_cast<xmlParserCtxtPtr>(ctx);
CDocumentBuilder *builder = static_cast< CDocumentBuilder* >(ctxt->_private);
Reference< XEntityResolver > resolver = builder->getEntityResolver();
OUString sysid;
if (systemId != nullptr)
sysid = OUString(reinterpret_cast<char const *>(systemId), strlen(reinterpret_cast<char const *>(systemId)), RTL_TEXTENCODING_UTF8);
OUString pubid;
if (publicId != nullptr)
pubid = OUString(reinterpret_cast<char const *>(publicId), strlen(reinterpret_cast<char const *>(publicId)), RTL_TEXTENCODING_UTF8);
// resolve the entity
InputSource src = resolver->resolveEntity(pubid, sysid);
// create IO context on heap because this call will no longer be on the stack
// when IO is actually performed through the callbacks. The close function must
// free the memory which is indicated by the freeOnClose field in the context struct
context_t *c = new context_t;
c->rInputStream = src.aInputStream;
c->close = true;
c->freeOnClose = true;
// set up the inputBuffer and inputPtr for libxml
xmlParserInputBufferPtr pBuffer =
xmlParserInputBufferCreateIO(xmlIO_read_func, xmlIO_close_func, c, XML_CHAR_ENCODING_NONE);
xmlParserInputPtr pInput =
xmlNewIOInputStream(ctxt, pBuffer, XML_CHAR_ENCODING_NONE);
return pInput;
}
#if 0
static xmlParserInputPtr external_entity_loader(const char *URL, const char * /*ID*/, xmlParserCtxtPtr ctxt)
{
// just call our resolver function using the URL as systemId
return resolve_func(ctxt, 0, (const xmlChar*)URL);
}
#endif
// default warning handler does not trigger assertion
static void warning_func(void * ctx, const char * /*msg*/, ...)
{
try
{
xmlParserCtxtPtr const pctx = static_cast<xmlParserCtxtPtr>(ctx);
SAL_INFO(
"unoxml",
"libxml2 warning: "
<< make_error_message(pctx));
CDocumentBuilder * const pDocBuilder = static_cast<CDocumentBuilder*>(pctx->_private);
if (pDocBuilder->getErrorHandler().is()) // if custom error handler is set (using setErrorHandler ())
{
// Prepare SAXParseException to be passed to custom XErrorHandler::warning function
css::xml::sax::SAXParseException saxex;
saxex.Message = make_error_message(pctx);
saxex.LineNumber = static_cast<sal_Int32>(pctx->lastError.line);
saxex.ColumnNumber = static_cast<sal_Int32>(pctx->lastError.int2);
// Call custom warning function
pDocBuilder->getErrorHandler()->warning(::css::uno::Any(saxex));
}
}
catch (const css::uno::Exception &)
{
// Protect lib2xml from UNO Exception
TOOLS_WARN_EXCEPTION("unoxml", "DOM::warning_func");
}
}
// default error handler triggers assertion
static void error_func(void * ctx, const char * /*msg*/, ...)
{
try
{
xmlParserCtxtPtr const pctx = static_cast<xmlParserCtxtPtr>(ctx);
SAL_WARN(
"unoxml",
"libxml2 error: "
<< make_error_message(pctx));
CDocumentBuilder * const pDocBuilder = static_cast<CDocumentBuilder*>(pctx->_private);
if (pDocBuilder->getErrorHandler().is()) // if custom error handler is set (using setErrorHandler ())
{
// Prepare SAXParseException to be passed to custom XErrorHandler::error function
css::xml::sax::SAXParseException saxex;
saxex.Message = make_error_message(pctx);
saxex.LineNumber = static_cast<sal_Int32>(pctx->lastError.line);
saxex.ColumnNumber = static_cast<sal_Int32>(pctx->lastError.int2);
// Call custom warning function
pDocBuilder->getErrorHandler()->error(::css::uno::Any(saxex));
}
}
catch (const css::uno::Exception &)
{
// Protect lib2xml from UNO Exception
TOOLS_WARN_EXCEPTION("unoxml", "DOM::error_func");
}
}
} // extern "C"
static void throwEx(xmlParserCtxtPtr ctxt)
{
css::xml::sax::SAXParseException saxex;
saxex.Message = make_error_message(ctxt);
saxex.LineNumber = static_cast<sal_Int32>(ctxt->lastError.line);
saxex.ColumnNumber = static_cast<sal_Int32>(ctxt->lastError.int2);
throw saxex;
}
namespace {
struct XmlFreeParserCtxt {
void operator ()(xmlParserCtxt * p) const { xmlFreeParserCtxt(p); }
};
}
Reference< XDocument > SAL_CALL CDocumentBuilder::parse(const Reference< XInputStream >& is)
{
if (!is.is()) {
throw RuntimeException();
}
std::scoped_lock const g(m_Mutex);
// IO context struct. Must outlive pContext, as destroying that via
// xmlFreeParserCtxt may still access this context_t
context_t c;
c.rInputStream = is;
// we did not open the stream, thus we do not close it.
c.close = false;
c.freeOnClose = false;
std::unique_ptr<xmlParserCtxt, XmlFreeParserCtxt> const pContext(
xmlNewParserCtxt());
// register error functions to prevent errors being printed
// on the console
pContext->_private = this;
pContext->sax->error = error_func;
pContext->sax->warning = warning_func;
pContext->sax->resolveEntity = resolve_func;
xmlDocPtr const pDoc = xmlCtxtReadIO(pContext.get(),
xmlIO_read_func, xmlIO_close_func, &c, nullptr, nullptr, 0);
if (pDoc == nullptr) {
throwEx(pContext.get());
}
return CDocument::CreateCDocument(pDoc);
}
Reference< XDocument > SAL_CALL CDocumentBuilder::parseURI(const OUString& sUri)
{
std::scoped_lock const g(m_Mutex);
std::unique_ptr<xmlParserCtxt, XmlFreeParserCtxt> const pContext(
xmlNewParserCtxt());
pContext->_private = this;
pContext->sax->error = error_func;
pContext->sax->warning = warning_func;
pContext->sax->resolveEntity = resolve_func;
// xmlSetExternalEntityLoader(external_entity_loader);
OString oUri = OUStringToOString(sUri, RTL_TEXTENCODING_UTF8);
char *uri = const_cast<char*>(oUri.getStr());
xmlDocPtr pDoc = xmlCtxtReadFile(pContext.get(), uri, nullptr, 0);
Reference< XDocument > xRet;
// if we failed to parse the URI as a simple file, lets try via a ucb stream.
// For Android file:///assets/ URLs which must go via the osl/ file API.
if (pDoc == nullptr) {
Reference < XSimpleFileAccess3 > xStreamAccess(
SimpleFileAccess::create( comphelper::getProcessComponentContext() ) );
Reference< XInputStream > xInStream = xStreamAccess->openFileRead( sUri );
if (!xInStream.is())
throwEx(pContext.get());
// loop over every layout entry in current file
xRet = parse( xInStream );
xInStream->closeInput();
xInStream.clear();
} else
xRet = CDocument::CreateCDocument(pDoc).get();
return xRet;
}
void SAL_CALL
CDocumentBuilder::setEntityResolver(Reference< XEntityResolver > const& xER)
{
std::scoped_lock const g(m_Mutex);
m_xEntityResolver = xER;
}
Reference< XEntityResolver > CDocumentBuilder::getEntityResolver()
{
std::scoped_lock const g(m_Mutex);
return m_xEntityResolver;
}
void SAL_CALL
CDocumentBuilder::setErrorHandler(Reference< XErrorHandler > const& xEH)
{
std::scoped_lock const g(m_Mutex);
m_xErrorHandler = xEH;
}
}
extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
unoxml_CDocumentBuilder_get_implementation(
css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)
{
return cppu::acquire(new DOM::CDocumentBuilder());
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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