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/**
* Licensed to the University Corporation for Advanced Internet
* Development, Inc. (UCAID) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*
* UCAID 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
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific
* language governing permissions and limitations under the License.
*/
/**
* LocalDynamicMetadataProvider.cpp
*
* Implementation of a directory base DynamicMetadataProvider.
*/
#include <fstream>
#include <boost/lexical_cast.hpp>
#include <boost/algorithm/string.hpp>
#include "internal.h"
#include <xmltooling/logging.h>
#include <xmltooling/XMLToolingConfig.h>
#include <xmltooling/security/SecurityHelper.h>
#include <xmltooling/util/PathResolver.h>
#include <xmltooling/util/XMLHelper.h>
#include <binding/SAMLArtifact.h>
#include <saml2/metadata/AbstractDynamicMetadataProvider.h>
#if defined(XMLTOOLING_LOG4SHIB)
# include <log4shib/NDC.hh>
#elif defined(XMLTOOLING_LOG4CPP)
# include <log4cpp/NDC.hh>
#endif
using namespace opensaml::saml2md;
using namespace xmltooling::logging;
using namespace xmltooling;
using namespace std;
static const XMLCh sourceDirectory[] = UNICODE_LITERAL_15(s,o,u,r,c,e,D,i,r,e,c,t,o,r,y);
namespace opensaml {
namespace saml2md {
class LocalDynamicMetadataProvider : public AbstractDynamicMetadataProvider {
public:
/**
* Constructor.
*
* @param e DOM to supply configuration for provider
*/
LocalDynamicMetadataProvider(const xercesc::DOMElement* e=nullptr);
void init() {};
protected:
virtual EntityDescriptor* resolve(const Criteria& criteria, string& cacheTag) const;
private:
Category& m_log;
string m_sourceDirectory;
};
MetadataProvider* SAML_DLLLOCAL LocalDynamicMetadataProviderFactory(const DOMElement* const & e, bool)
{
return new LocalDynamicMetadataProvider(e);
}
};
};
LocalDynamicMetadataProvider::LocalDynamicMetadataProvider(const DOMElement* e)
: MetadataProvider(e), AbstractDynamicMetadataProvider(false, e),
m_log(Category::getInstance(SAML_LOGCAT ".MetadataProvider.LocalDynamic")),
m_sourceDirectory(XMLHelper::getAttrString(e, nullptr, sourceDirectory))
{
if (m_sourceDirectory.empty())
throw MetadataException("LocalDynamicMetadataProvider: sourceDirectory=\"whatever\" must be present");
XMLToolingConfig::getConfig().getPathResolver()->resolve(m_sourceDirectory, PathResolver::XMLTOOLING_CFG_FILE);
if (!boost::algorithm::ends_with(m_sourceDirectory, "/"))
m_sourceDirectory += '/';
}
EntityDescriptor* LocalDynamicMetadataProvider::resolve(const Criteria& criteria, string& cacheTag) const
{
string name, from;
if (criteria.entityID_ascii) {
from = criteria.entityID_ascii;
name = SecurityHelper::doHash("SHA1", from.c_str(), from.length());
}
else if (criteria.entityID_unicode) {
auto_ptr_char temp(criteria.entityID_unicode);
from = temp.get();
name = SecurityHelper::doHash("SHA1", from.c_str(), from.length());
}
else if (criteria.artifact) {
from = name = criteria.artifact->getSource();
}
name = m_sourceDirectory + name + ".xml";
m_log.debug("transformed name from (%s) to (%s)", from.c_str(), name.c_str());
time_t lastaccess;
#ifdef WIN32
struct _stat stat_buf;
if (_stat(name.c_str(), &stat_buf) == 0)
#else
struct stat stat_buf;
if (stat(name.c_str(), &stat_buf) == 0)
#endif
lastaccess = stat_buf.st_mtime;
else
throw IOException("Unable to access local file ($1)", params(1, name.c_str()));
// Note that we're at minimum under a read lock here overall, which precludes the cleanup
// thread in the base class from running a cleanup pass, and potentially invalidating
// state during this evaluation. That should prevent a race condition where we determine
// no update is needed but the original copy is purged before the query finishes.
try {
string newCacheTag = boost::lexical_cast<string>(lastaccess);
if (cacheTag == newCacheTag)
return nullptr;
cacheTag = newCacheTag;
}
catch (const boost::bad_lexical_cast& e) {
m_log.error("exception converting between cache tag and access time: %s", e.what());
cacheTag = "";
}
ifstream source(name.c_str());
if (!source) {
m_log.debug("local metadata file (%s) not accessible for input (%s)", name.c_str(), from.c_str());
throw IOException("Unable to access local file ($1)", params(1, name.c_str()));
}
EntityDescriptor* result = entityFromStream(source);
if (!result)
throw MetadataException("No entity resolved from file."); // shouldn't happen
return result;
}
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