org.apache.archiva.webdav.ArchivaDavResourceFactory.java Source code

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package org.apache.archiva.webdav;

/*
 * 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
 *
 * 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.
 */

import org.apache.archiva.admin.model.RepositoryAdminException;
import org.apache.archiva.admin.model.beans.ManagedRepository;
import org.apache.archiva.admin.model.beans.RemoteRepository;
import org.apache.archiva.admin.model.managed.ManagedRepositoryAdmin;
import org.apache.archiva.admin.model.remote.RemoteRepositoryAdmin;
import org.apache.archiva.audit.Auditable;
import org.apache.archiva.common.filelock.FileLockManager;
import org.apache.archiva.common.plexusbridge.PlexusSisuBridge;
import org.apache.archiva.common.plexusbridge.PlexusSisuBridgeException;
import org.apache.archiva.common.utils.PathUtil;
import org.apache.archiva.common.utils.VersionUtil;
import org.apache.archiva.configuration.ArchivaConfiguration;
import org.apache.archiva.configuration.RepositoryGroupConfiguration;
import org.apache.archiva.indexer.merger.IndexMerger;
import org.apache.archiva.indexer.merger.IndexMergerException;
import org.apache.archiva.indexer.merger.IndexMergerRequest;
import org.apache.archiva.indexer.merger.MergedRemoteIndexesTask;
import org.apache.archiva.indexer.merger.MergedRemoteIndexesTaskRequest;
import org.apache.archiva.indexer.merger.TemporaryGroupIndex;
import org.apache.archiva.indexer.search.RepositorySearch;
import org.apache.archiva.maven2.metadata.MavenMetadataReader;
import org.apache.archiva.metadata.model.facets.AuditEvent;
import org.apache.archiva.metadata.repository.storage.RelocationException;
import org.apache.archiva.metadata.repository.storage.RepositoryStorage;
import org.apache.archiva.model.ArchivaRepositoryMetadata;
import org.apache.archiva.model.ArtifactReference;
import org.apache.archiva.policies.ProxyDownloadException;
import org.apache.archiva.proxy.model.RepositoryProxyConnectors;
import org.apache.archiva.redback.authentication.AuthenticationException;
import org.apache.archiva.redback.authentication.AuthenticationResult;
import org.apache.archiva.redback.authorization.AuthorizationException;
import org.apache.archiva.redback.authorization.UnauthorizedException;
import org.apache.archiva.redback.integration.filter.authentication.HttpAuthenticator;
import org.apache.archiva.redback.policy.AccountLockedException;
import org.apache.archiva.redback.policy.MustChangePasswordException;
import org.apache.archiva.redback.system.SecuritySession;
import org.apache.archiva.redback.users.User;
import org.apache.archiva.redback.users.UserManager;
import org.apache.archiva.repository.ManagedRepositoryContent;
import org.apache.archiva.repository.RepositoryContentFactory;
import org.apache.archiva.repository.RepositoryException;
import org.apache.archiva.repository.RepositoryNotFoundException;
import org.apache.archiva.repository.content.maven2.RepositoryRequest;
import org.apache.archiva.repository.events.AuditListener;
import org.apache.archiva.repository.layout.LayoutException;
import org.apache.archiva.repository.metadata.MetadataTools;
import org.apache.archiva.repository.metadata.RepositoryMetadataException;
import org.apache.archiva.repository.metadata.RepositoryMetadataMerge;
import org.apache.archiva.repository.metadata.RepositoryMetadataWriter;
import org.apache.archiva.scheduler.repository.model.RepositoryArchivaTaskScheduler;
import org.apache.archiva.security.ServletAuthenticator;
import org.apache.archiva.webdav.util.MimeTypes;
import org.apache.archiva.webdav.util.TemporaryGroupIndexSessionCleaner;
import org.apache.archiva.webdav.util.WebdavMethodUtil;
import org.apache.archiva.xml.XMLException;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.SystemUtils;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.DavResource;
import org.apache.jackrabbit.webdav.DavResourceFactory;
import org.apache.jackrabbit.webdav.DavResourceLocator;
import org.apache.jackrabbit.webdav.DavServletRequest;
import org.apache.jackrabbit.webdav.DavServletResponse;
import org.apache.jackrabbit.webdav.DavSession;
import org.apache.jackrabbit.webdav.lock.LockManager;
import org.apache.jackrabbit.webdav.lock.SimpleLockManager;
import org.apache.maven.index.context.IndexingContext;
import org.codehaus.plexus.digest.ChecksumFile;
import org.codehaus.plexus.digest.Digester;
import org.codehaus.plexus.digest.DigesterException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MarkerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import javax.inject.Named;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 *
 */
@Service("davResourceFactory#archiva")
public class ArchivaDavResourceFactory implements DavResourceFactory, Auditable {
    private static final String PROXIED_SUFFIX = " (proxied)";

    private static final String HTTP_PUT_METHOD = "PUT";

    private Logger log = LoggerFactory.getLogger(ArchivaDavResourceFactory.class);

    @Inject
    private List<AuditListener> auditListeners = new ArrayList<>();

    @Inject
    private RepositoryContentFactory repositoryFactory;

    private RepositoryRequest repositoryRequest;

    @Inject
    @Named(value = "repositoryProxyConnectors#default")
    private RepositoryProxyConnectors connectors;

    @Inject
    private MetadataTools metadataTools;

    @Inject
    private MimeTypes mimeTypes;

    private ArchivaConfiguration archivaConfiguration;

    @Inject
    private ServletAuthenticator servletAuth;

    @Inject
    @Named(value = "httpAuthenticator#basic")
    private HttpAuthenticator httpAuth;

    @Inject
    private RemoteRepositoryAdmin remoteRepositoryAdmin;

    @Inject
    private ManagedRepositoryAdmin managedRepositoryAdmin;

    @Inject
    private IndexMerger indexMerger;

    @Inject
    private RepositorySearch repositorySearch;

    /**
     * Lock Manager - use simple implementation from JackRabbit
     */
    private final LockManager lockManager = new SimpleLockManager();

    private ChecksumFile checksum;

    private Digester digestSha1;

    private Digester digestMd5;

    @Inject
    @Named(value = "archivaTaskScheduler#repository")
    private RepositoryArchivaTaskScheduler scheduler;

    @Inject
    @Named(value = "fileLockManager#default")
    private FileLockManager fileLockManager;

    private ApplicationContext applicationContext;

    @Inject
    public ArchivaDavResourceFactory(ApplicationContext applicationContext, PlexusSisuBridge plexusSisuBridge,
            ArchivaConfiguration archivaConfiguration) throws PlexusSisuBridgeException {
        this.archivaConfiguration = archivaConfiguration;
        this.applicationContext = applicationContext;
        this.checksum = plexusSisuBridge.lookup(ChecksumFile.class);

        this.digestMd5 = plexusSisuBridge.lookup(Digester.class, "md5");
        this.digestSha1 = plexusSisuBridge.lookup(Digester.class, "sha1");

        // TODO remove this hard dependency on maven !!
        repositoryRequest = new RepositoryRequest();
    }

    @PostConstruct
    public void initialize() {
        // no op
    }

    @Override
    public DavResource createResource(final DavResourceLocator locator, final DavServletRequest request,
            final DavServletResponse response) throws DavException {
        ArchivaDavResourceLocator archivaLocator = checkLocatorIsInstanceOfRepositoryLocator(locator);

        RepositoryGroupConfiguration repoGroupConfig = archivaConfiguration.getConfiguration()
                .getRepositoryGroupsAsMap().get(archivaLocator.getRepositoryId());

        String activePrincipal = getActivePrincipal(request);

        List<String> resourcesInAbsolutePath = new ArrayList<>();

        boolean readMethod = WebdavMethodUtil.isReadMethod(request.getMethod());
        DavResource resource;
        if (repoGroupConfig != null) {
            if (!readMethod) {
                throw new DavException(HttpServletResponse.SC_METHOD_NOT_ALLOWED,
                        "Write method not allowed for repository groups.");
            }

            log.debug("Repository group '{}' accessed by '{}", repoGroupConfig.getId(), activePrincipal);

            // handle browse requests for virtual repos
            if (getLogicalResource(archivaLocator, null, true).endsWith("/")) {
                try {
                    DavResource davResource = getResourceFromGroup(request, repoGroupConfig.getRepositories(),
                            archivaLocator, repoGroupConfig);

                    setHeaders(response, locator, davResource, true);

                    return davResource;

                } catch (RepositoryAdminException e) {
                    throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
                }
            } else {
                // make a copy to avoid potential concurrent modifications (eg. by configuration)
                // TODO: ultimately, locking might be more efficient than copying in this fashion since updates are
                //  infrequent
                List<String> repositories = new ArrayList<>(repoGroupConfig.getRepositories());
                resource = processRepositoryGroup(request, archivaLocator, repositories, activePrincipal,
                        resourcesInAbsolutePath, repoGroupConfig);
            }
        } else {

            try {
                RemoteRepository remoteRepository = remoteRepositoryAdmin
                        .getRemoteRepository(archivaLocator.getRepositoryId());

                if (remoteRepository != null) {
                    String logicalResource = getLogicalResource(archivaLocator, null, false);
                    IndexingContext indexingContext = remoteRepositoryAdmin.createIndexContext(remoteRepository);
                    File resourceFile = StringUtils.equals(logicalResource, "/")
                            ? new File(indexingContext.getIndexDirectoryFile().getParent())
                            : new File(indexingContext.getIndexDirectoryFile().getParent(), logicalResource);
                    resource = new ArchivaDavResource(resourceFile.getAbsolutePath(), //
                            locator.getResourcePath(), //
                            null, //
                            request.getRemoteAddr(), //
                            activePrincipal, //
                            request.getDavSession(), //
                            archivaLocator, //
                            this, //
                            mimeTypes, //
                            auditListeners, //
                            scheduler, //
                            fileLockManager);
                    setHeaders(response, locator, resource, false);
                    return resource;
                }
            } catch (RepositoryAdminException e) {
                log.debug("RepositoryException remote repository with d'{}' not found, msg: {}",
                        archivaLocator.getRepositoryId(), e.getMessage());
            }

            ManagedRepositoryContent managedRepositoryContent = null;

            try {
                managedRepositoryContent = repositoryFactory
                        .getManagedRepositoryContent(archivaLocator.getRepositoryId());
            } catch (RepositoryNotFoundException e) {
                throw new DavException(HttpServletResponse.SC_NOT_FOUND,
                        "Invalid repository: " + archivaLocator.getRepositoryId());
            } catch (RepositoryException e) {
                throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
            }

            log.debug("Managed repository '{}' accessed by '{}'", managedRepositoryContent.getId(),
                    activePrincipal);

            try {
                resource = processRepository(request, archivaLocator, activePrincipal, managedRepositoryContent,
                        managedRepositoryAdmin.getManagedRepository(archivaLocator.getRepositoryId()));

                String logicalResource = getLogicalResource(archivaLocator, null, false);
                resourcesInAbsolutePath
                        .add(new File(managedRepositoryContent.getRepoRoot(), logicalResource).getAbsolutePath());

            } catch (RepositoryAdminException e) {
                throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
            }
        }

        String requestedResource = request.getRequestURI();

        // MRM-872 : merge all available metadata
        // merge metadata only when requested via the repo group
        if ((repositoryRequest.isMetadata(requestedResource)
                || repositoryRequest.isMetadataSupportFile(requestedResource)) && repoGroupConfig != null) {
            // this should only be at the project level not version level!
            if (isProjectReference(requestedResource)) {

                ArchivaDavResource res = (ArchivaDavResource) resource;
                String filePath = StringUtils
                        .substringBeforeLast(res.getLocalResource().getAbsolutePath().replace('\\', '/'), "/");
                filePath = filePath + "/maven-metadata-" + repoGroupConfig.getId() + ".xml";

                // for MRM-872 handle checksums of the merged metadata files
                if (repositoryRequest.isSupportFile(requestedResource)) {
                    File metadataChecksum = new File(
                            filePath + "." + StringUtils.substringAfterLast(requestedResource, "."));

                    if (metadataChecksum.exists()) {
                        LogicalResource logicalResource = new LogicalResource(
                                getLogicalResource(archivaLocator, null, false));

                        resource = new ArchivaDavResource(metadataChecksum.getAbsolutePath(),
                                logicalResource.getPath(), null, request.getRemoteAddr(), activePrincipal,
                                request.getDavSession(), archivaLocator, this, mimeTypes, auditListeners, scheduler,
                                fileLockManager);
                    }
                } else {
                    if (resourcesInAbsolutePath != null && resourcesInAbsolutePath.size() > 1) {
                        // merge the metadata of all repos under group
                        ArchivaRepositoryMetadata mergedMetadata = new ArchivaRepositoryMetadata();
                        for (String resourceAbsPath : resourcesInAbsolutePath) {
                            try {
                                File metadataFile = new File(resourceAbsPath);
                                ArchivaRepositoryMetadata repoMetadata = MavenMetadataReader.read(metadataFile);
                                mergedMetadata = RepositoryMetadataMerge.merge(mergedMetadata, repoMetadata);
                            } catch (XMLException e) {
                                throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                                        "Error occurred while reading metadata file.");
                            } catch (RepositoryMetadataException r) {
                                throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                                        "Error occurred while merging metadata file.");
                            }
                        }

                        try {
                            File resourceFile = writeMergedMetadataToFile(mergedMetadata, filePath);

                            LogicalResource logicalResource = new LogicalResource(
                                    getLogicalResource(archivaLocator, null, false));

                            resource = new ArchivaDavResource(resourceFile.getAbsolutePath(),
                                    logicalResource.getPath(), null, request.getRemoteAddr(), activePrincipal,
                                    request.getDavSession(), archivaLocator, this, mimeTypes, auditListeners,
                                    scheduler, fileLockManager);
                        } catch (RepositoryMetadataException r) {
                            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                                    "Error occurred while writing metadata file.");
                        } catch (IOException ie) {
                            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                                    "Error occurred while generating checksum files.");
                        } catch (DigesterException de) {
                            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                                    "Error occurred while generating checksum files." + de.getMessage());
                        }
                    }
                }
            }
        }

        setHeaders(response, locator, resource, false);

        // compatibility with MRM-440 to ensure browsing the repository works ok
        if (resource.isCollection() && !request.getRequestURI().endsWith("/")) {
            throw new BrowserRedirectException(resource.getHref());
        }
        resource.addLockManager(lockManager);
        return resource;
    }

    private DavResource processRepositoryGroup(final DavServletRequest request,
            ArchivaDavResourceLocator archivaLocator, List<String> repositories, String activePrincipal,
            List<String> resourcesInAbsolutePath, RepositoryGroupConfiguration repoGroupConfig)
            throws DavException {
        DavResource resource = null;
        List<DavException> storedExceptions = new ArrayList<>();

        String pathInfo = StringUtils.removeEnd(request.getPathInfo(), "/");

        String rootPath = StringUtils.substringBeforeLast(pathInfo, "/");

        if (StringUtils.endsWith(rootPath, repoGroupConfig.getMergedIndexPath())) {
            // we are in the case of index file request
            String requestedFileName = StringUtils.substringAfterLast(pathInfo, "/");
            File temporaryIndexDirectory = buildMergedIndexDirectory(repositories, activePrincipal, request,
                    repoGroupConfig);

            File resourceFile = new File(temporaryIndexDirectory, requestedFileName);
            resource = new ArchivaDavResource(resourceFile.getAbsolutePath(), requestedFileName, null,
                    request.getRemoteAddr(), activePrincipal, request.getDavSession(), archivaLocator, this,
                    mimeTypes, auditListeners, scheduler, fileLockManager);

        } else {
            for (String repositoryId : repositories) {
                ManagedRepositoryContent managedRepositoryContent;
                try {
                    managedRepositoryContent = repositoryFactory.getManagedRepositoryContent(repositoryId);
                } catch (RepositoryNotFoundException e) {
                    throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
                } catch (RepositoryException e) {
                    throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
                }

                try {
                    ManagedRepository managedRepository = managedRepositoryAdmin.getManagedRepository(repositoryId);
                    DavResource updatedResource = processRepository(request, archivaLocator, activePrincipal,
                            managedRepositoryContent, managedRepository);
                    if (resource == null) {
                        resource = updatedResource;
                    }

                    String logicalResource = getLogicalResource(archivaLocator, null, false);
                    if (logicalResource.endsWith("/")) {
                        logicalResource = logicalResource.substring(1);
                    }
                    resourcesInAbsolutePath.add(
                            new File(managedRepositoryContent.getRepoRoot(), logicalResource).getAbsolutePath());
                } catch (DavException e) {
                    storedExceptions.add(e);
                } catch (RepositoryAdminException e) {
                    storedExceptions.add(new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e));
                }
            }
        }
        if (resource == null) {
            if (!storedExceptions.isEmpty()) {
                // MRM-1232
                for (DavException e : storedExceptions) {
                    if (401 == e.getErrorCode()) {
                        throw e;
                    }
                }

                throw new DavException(HttpServletResponse.SC_NOT_FOUND);
            } else {
                throw new DavException(HttpServletResponse.SC_NOT_FOUND);
            }
        }
        return resource;
    }

    private String getLogicalResource(ArchivaDavResourceLocator archivaLocator, ManagedRepository managedRepository,
            boolean useOrigResourcePath) {
        // FIXME remove this hack
        // but currently managedRepository can be null in case of group
        String layout = managedRepository == null ? new ManagedRepository().getLayout()
                : managedRepository.getLayout();
        RepositoryStorage repositoryStorage = this.applicationContext.getBean("repositoryStorage#" + layout,
                RepositoryStorage.class);
        String path = repositoryStorage.getFilePath(
                useOrigResourcePath ? archivaLocator.getOrigResourcePath() : archivaLocator.getResourcePath(),
                managedRepository);
        log.debug("found path {} for resourcePath: '{}' with managedRepo '{}' and layout '{}'", path,
                archivaLocator.getResourcePath(), managedRepository == null ? "null" : managedRepository.getId(),
                layout);
        return path;
    }

    private String evaluatePathWithVersion(ArchivaDavResourceLocator archivaLocator, //
            ManagedRepositoryContent managedRepositoryContent, //
            String contextPath) throws DavException {
        String layout = managedRepositoryContent.getRepository() == null ? new ManagedRepository().getLayout()
                : managedRepositoryContent.getRepository().getLayout();
        RepositoryStorage repositoryStorage = this.applicationContext.getBean("repositoryStorage#" + layout,
                RepositoryStorage.class);
        try {
            return repositoryStorage.getFilePathWithVersion(archivaLocator.getResourcePath(), //
                    managedRepositoryContent);
        } catch (RelocationException e) {
            String path = e.getPath();
            log.debug("Relocation to {}", path);

            throw new BrowserRedirectException(addHrefPrefix(contextPath, path), e.getRelocationType());
        } catch (XMLException e) {
            log.error(e.getMessage(), e);
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        }
    }

    private DavResource processRepository(final DavServletRequest request, ArchivaDavResourceLocator archivaLocator,
            String activePrincipal, ManagedRepositoryContent managedRepositoryContent,
            ManagedRepository managedRepository) throws DavException {
        DavResource resource = null;
        if (isAuthorized(request, managedRepositoryContent.getId())) {
            boolean readMethod = WebdavMethodUtil.isReadMethod(request.getMethod());
            // Maven Centric part ask evaluation if -SNAPSHOT
            // MRM-1846 test if read method to prevent issue with maven 2.2.1 and uniqueVersion false

            String path = readMethod
                    ? evaluatePathWithVersion(archivaLocator, managedRepositoryContent, request.getContextPath())
                    : getLogicalResource(archivaLocator, managedRepository, false);
            if (path.startsWith("/")) {
                path = path.substring(1);
            }
            LogicalResource logicalResource = new LogicalResource(path);
            File resourceFile = new File(managedRepositoryContent.getRepoRoot(), path);
            resource = new ArchivaDavResource(resourceFile.getAbsolutePath(), path,
                    managedRepositoryContent.getRepository(), request.getRemoteAddr(), activePrincipal,
                    request.getDavSession(), archivaLocator, this, mimeTypes, auditListeners, scheduler,
                    fileLockManager);

            if (WebdavMethodUtil.isReadMethod(request.getMethod())) {
                if (archivaLocator.getHref(false).endsWith("/") && !resourceFile.isDirectory()) {
                    // force a resource not found
                    throw new DavException(HttpServletResponse.SC_NOT_FOUND, "Resource does not exist");
                } else {
                    if (!resource.isCollection()) {
                        boolean previouslyExisted = resourceFile.exists();

                        boolean fromProxy = fetchContentFromProxies(managedRepositoryContent, request,
                                logicalResource);

                        // At this point the incoming request can either be in default or
                        // legacy layout format.
                        try {
                            // Perform an adjustment of the resource to the managed
                            // repository expected path.
                            String localResourcePath = repositoryRequest.toNativePath(logicalResource.getPath(),
                                    managedRepositoryContent);
                            resourceFile = new File(managedRepositoryContent.getRepoRoot(), localResourcePath);
                            resource = new ArchivaDavResource(resourceFile.getAbsolutePath(),
                                    logicalResource.getPath(), managedRepositoryContent.getRepository(),
                                    request.getRemoteAddr(), activePrincipal, request.getDavSession(),
                                    archivaLocator, this, mimeTypes, auditListeners, scheduler, fileLockManager);
                        } catch (LayoutException e) {
                            if (!resourceFile.exists()) {
                                throw new DavException(HttpServletResponse.SC_NOT_FOUND, e);
                            }
                        }

                        if (fromProxy) {
                            String action = (previouslyExisted ? AuditEvent.MODIFY_FILE : AuditEvent.CREATE_FILE)
                                    + PROXIED_SUFFIX;

                            log.debug("Proxied artifact '{}' in repository '{}' (current user '{}')",
                                    resourceFile.getName(), managedRepositoryContent.getId(), activePrincipal);

                            triggerAuditEvent(request.getRemoteAddr(), archivaLocator.getRepositoryId(),
                                    logicalResource.getPath(), action, activePrincipal);
                        }

                        if (!resourceFile.exists()) {
                            throw new DavException(HttpServletResponse.SC_NOT_FOUND, "Resource does not exist");
                        }
                    }
                }
            }

            if (request.getMethod().equals(HTTP_PUT_METHOD)) {
                String resourcePath = logicalResource.getPath();

                // check if target repo is enabled for releases
                // we suppose that release-artifacts can be deployed only to repos enabled for releases
                if (managedRepositoryContent.getRepository().isReleases()
                        && !repositoryRequest.isMetadata(resourcePath)
                        && !repositoryRequest.isSupportFile(resourcePath)) {
                    ArtifactReference artifact = null;
                    try {
                        artifact = managedRepositoryContent.toArtifactReference(resourcePath);

                        if (!VersionUtil.isSnapshot(artifact.getVersion())) {
                            // check if artifact already exists and if artifact re-deployment to the repository is allowed
                            if (managedRepositoryContent.hasContent(artifact)
                                    && managedRepositoryContent.getRepository().isBlockRedeployments()) {
                                log.warn("Overwriting released artifacts in repository '{}' is not allowed.",
                                        managedRepositoryContent.getId());
                                throw new DavException(HttpServletResponse.SC_CONFLICT,
                                        "Overwriting released artifacts is not allowed.");
                            }
                        }
                    } catch (LayoutException e) {
                        log.warn("Artifact path '{}' is invalid.", resourcePath);
                    }
                }

                /*
                 * Create parent directories that don't exist when writing a file This actually makes this
                 * implementation not compliant to the WebDAV RFC - but we have enough knowledge about how the
                 * collection is being used to do this reasonably and some versions of Maven's WebDAV don't correctly
                 * create the collections themselves.
                 */

                File rootDirectory = new File(managedRepositoryContent.getRepoRoot());
                File destDir = new File(rootDirectory, logicalResource.getPath()).getParentFile();

                if (!destDir.exists()) {
                    destDir.mkdirs();
                    String relPath = PathUtil.getRelative(rootDirectory.getAbsolutePath(), destDir);

                    log.debug("Creating destination directory '{}' (current user '{}')", destDir.getName(),
                            activePrincipal);

                    triggerAuditEvent(request.getRemoteAddr(), managedRepositoryContent.getId(), relPath,
                            AuditEvent.CREATE_DIR, activePrincipal);
                }
            }
        }
        return resource;
    }

    @Override
    public DavResource createResource(final DavResourceLocator locator, final DavSession davSession)
            throws DavException {
        ArchivaDavResourceLocator archivaLocator = checkLocatorIsInstanceOfRepositoryLocator(locator);

        ManagedRepositoryContent managedRepositoryContent;
        try {
            managedRepositoryContent = repositoryFactory
                    .getManagedRepositoryContent(archivaLocator.getRepositoryId());
        } catch (RepositoryNotFoundException e) {
            throw new DavException(HttpServletResponse.SC_NOT_FOUND,
                    "Invalid repository: " + archivaLocator.getRepositoryId());
        } catch (RepositoryException e) {
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        }

        DavResource resource = null;
        try {
            String logicalResource = getLogicalResource(archivaLocator,
                    managedRepositoryAdmin.getManagedRepository(archivaLocator.getRepositoryId()), false);
            if (logicalResource.startsWith("/")) {
                logicalResource = logicalResource.substring(1);
            }
            File resourceFile = new File(managedRepositoryContent.getRepoRoot(), logicalResource);
            resource = new ArchivaDavResource(resourceFile.getAbsolutePath(), logicalResource,
                    managedRepositoryContent.getRepository(), davSession, archivaLocator, this, mimeTypes,
                    auditListeners, scheduler, fileLockManager);

            resource.addLockManager(lockManager);
        } catch (RepositoryAdminException e) {
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        }
        return resource;
    }

    private boolean fetchContentFromProxies(ManagedRepositoryContent managedRepository, DavServletRequest request,
            LogicalResource resource) throws DavException {
        String path = resource.getPath();
        if (repositoryRequest.isSupportFile(path)) {
            File proxiedFile = connectors.fetchFromProxies(managedRepository, path);

            return (proxiedFile != null);
        }

        // Is it a Metadata resource?
        if (repositoryRequest.isDefault(path) && repositoryRequest.isMetadata(path)) {
            return connectors.fetchMetadataFromProxies(managedRepository, path).isModified();
        }

        // Is it an Archetype Catalog?
        if (repositoryRequest.isArchetypeCatalog(path)) {
            // FIXME we must implement a merge of remote archetype catalog from remote servers.
            File proxiedFile = connectors.fetchFromProxies(managedRepository, path);

            return (proxiedFile != null);
        }

        // Not any of the above? Then it's gotta be an artifact reference.
        try {
            // Get the artifact reference in a layout neutral way.
            ArtifactReference artifact = repositoryRequest.toArtifactReference(path);

            if (artifact != null) {
                String repositoryLayout = managedRepository.getRepository().getLayout();

                RepositoryStorage repositoryStorage = this.applicationContext
                        .getBean("repositoryStorage#" + repositoryLayout, RepositoryStorage.class);
                repositoryStorage.applyServerSideRelocation(managedRepository, artifact);

                File proxiedFile = connectors.fetchFromProxies(managedRepository, artifact);

                resource.setPath(managedRepository.toPath(artifact));

                log.debug("Proxied artifact '{}:{}:{}'", artifact.getGroupId(), artifact.getArtifactId(),
                        artifact.getVersion());

                return (proxiedFile != null);
            }
        } catch (LayoutException e) {
            /* eat it */
        } catch (ProxyDownloadException e) {
            log.error(e.getMessage(), e);
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                    "Unable to fetch artifact resource.");
        }
        return false;
    }

    // TODO: remove?

    private void triggerAuditEvent(String remoteIP, String repositoryId, String resource, String action,
            String principal) {
        AuditEvent event = new AuditEvent(repositoryId, principal, resource, action);
        event.setRemoteIP(remoteIP);

        for (AuditListener listener : auditListeners) {
            listener.auditEvent(event);
        }
    }

    @Override
    public void addAuditListener(AuditListener listener) {
        this.auditListeners.add(listener);
    }

    @Override
    public void clearAuditListeners() {
        this.auditListeners.clear();
    }

    @Override
    public void removeAuditListener(AuditListener listener) {
        this.auditListeners.remove(listener);
    }

    private void setHeaders(DavServletResponse response, DavResourceLocator locator, DavResource resource,
            boolean group) {
        // [MRM-503] - Metadata file need Pragma:no-cache response
        // header.
        if (locator.getResourcePath().endsWith("/maven-metadata.xml") || (resource instanceof ArchivaDavResource
                && (ArchivaDavResource.class.cast(resource).getLocalResource().isDirectory()))) {
            response.setHeader("Pragma", "no-cache");
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Last-Modified", new Date().getTime());
        }
        // if the resource is a directory don't cache it as new groupId deployed will be available
        // without need of refreshing browser
        else if (locator.getResourcePath().endsWith("/maven-metadata.xml")
                || (resource instanceof ArchivaVirtualDavResource
                        && (new File(ArchivaVirtualDavResource.class.cast(resource).getLogicalResource())
                                .isDirectory()))) {
            response.setHeader("Pragma", "no-cache");
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Last-Modified", new Date().getTime());
        } else if (group) {
            if (resource instanceof ArchivaVirtualDavResource) {
                //MRM-1854 here we have a directory so force "Last-Modified"
                response.setDateHeader("Last-Modified", new Date().getTime());
            }
        } else {
            // We need to specify this so connecting wagons can work correctly
            response.setDateHeader("Last-Modified", resource.getModificationTime());
        }
        // TODO: [MRM-524] determine http caching options for other types of files (artifacts, sha1, md5, snapshots)
    }

    private ArchivaDavResourceLocator checkLocatorIsInstanceOfRepositoryLocator(DavResourceLocator locator)
            throws DavException {
        if (!(locator instanceof ArchivaDavResourceLocator)) {
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                    "Locator does not implement RepositoryLocator");
        }

        // Hidden paths
        if (locator.getResourcePath().startsWith(ArchivaDavResource.HIDDEN_PATH_PREFIX)) {
            throw new DavException(HttpServletResponse.SC_NOT_FOUND);
        }

        ArchivaDavResourceLocator archivaLocator = (ArchivaDavResourceLocator) locator;

        // MRM-419 - Windows Webdav support. Should not 404 if there is no content.
        if (StringUtils.isEmpty(archivaLocator.getRepositoryId())) {
            throw new DavException(HttpServletResponse.SC_NO_CONTENT);
        }
        return archivaLocator;
    }

    private String addHrefPrefix(String contextPath, String path) {
        String prefix = archivaConfiguration.getConfiguration().getWebapp().getUi().getApplicationUrl();
        if (prefix == null || prefix.isEmpty()) {
            prefix = contextPath;
        }
        return prefix + (StringUtils.startsWith(path, "/") ? "" : (StringUtils.endsWith(prefix, "/") ? "" : "/"))
                + path;
    }

    private static class LogicalResource {
        private String path;

        public LogicalResource(String path) {
            this.path = path;
        }

        public String getPath() {
            return path;
        }

        public void setPath(String path) {
            this.path = path;
        }
    }

    protected boolean isAuthorized(DavServletRequest request, String repositoryId) throws DavException {
        try {
            AuthenticationResult result = httpAuth.getAuthenticationResult(request, null);
            SecuritySession securitySession = httpAuth.getSecuritySession(request.getSession(true));

            return servletAuth.isAuthenticated(request, result) //
                    && servletAuth.isAuthorized(request, securitySession, repositoryId, //
                            WebdavMethodUtil.getMethodPermission(request.getMethod()));
        } catch (AuthenticationException e) {
            // safety check for MRM-911
            String guest = UserManager.GUEST_USERNAME;
            try {
                if (servletAuth.isAuthorized(guest,
                        ((ArchivaDavResourceLocator) request.getRequestLocator()).getRepositoryId(),
                        WebdavMethodUtil.getMethodPermission(request.getMethod()))) {
                    return true;
                }
            } catch (UnauthorizedException ae) {
                throw new UnauthorizedDavException(repositoryId,
                        "You are not authenticated and authorized to access any repository.");
            }

            throw new UnauthorizedDavException(repositoryId, "You are not authenticated");
        } catch (MustChangePasswordException e) {
            throw new UnauthorizedDavException(repositoryId, "You must change your password.");
        } catch (AccountLockedException e) {
            throw new UnauthorizedDavException(repositoryId, "User account is locked.");
        } catch (AuthorizationException e) {
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                    "Fatal Authorization Subsystem Error.");
        } catch (UnauthorizedException e) {
            throw new UnauthorizedDavException(repositoryId, e.getMessage());
        }
    }

    private DavResource getResourceFromGroup(DavServletRequest request, List<String> repositories,
            ArchivaDavResourceLocator locator, RepositoryGroupConfiguration repositoryGroupConfiguration)
            throws DavException, RepositoryAdminException {
        if (repositoryGroupConfiguration.getRepositories() == null
                || repositoryGroupConfiguration.getRepositories().isEmpty()) {
            File file = new File(System.getProperty("appserver.base"),
                    "groups/" + repositoryGroupConfiguration.getId());

            return new ArchivaDavResource(file.getPath(), "groups/" + repositoryGroupConfiguration.getId(), null,
                    request.getDavSession(), locator, this, mimeTypes, auditListeners, scheduler, fileLockManager);
        }
        List<File> mergedRepositoryContents = new ArrayList<>();
        // multiple repo types so we guess they are all the same type
        // so use the first one
        // FIXME add a method with group in the repository storage
        String firstRepoId = repositoryGroupConfiguration.getRepositories().get(0);

        String path = getLogicalResource(locator, managedRepositoryAdmin.getManagedRepository(firstRepoId), false);
        if (path.startsWith("/")) {
            path = path.substring(1);
        }
        LogicalResource logicalResource = new LogicalResource(path);

        // flow:
        // if the current user logged in has permission to any of the repositories, allow user to
        // browse the repo group but displaying only the repositories which the user has permission to access.
        // otherwise, prompt for authentication.

        String activePrincipal = getActivePrincipal(request);

        boolean allow = isAllowedToContinue(request, repositories, activePrincipal);

        // remove last /
        String pathInfo = StringUtils.removeEnd(request.getPathInfo(), "/");

        if (allow) {

            if (StringUtils.endsWith(pathInfo, repositoryGroupConfiguration.getMergedIndexPath())) {
                File mergedRepoDir = buildMergedIndexDirectory(repositories, activePrincipal, request,
                        repositoryGroupConfiguration);
                mergedRepositoryContents.add(mergedRepoDir);
            } else {
                if (StringUtils.equalsIgnoreCase(pathInfo, "/" + repositoryGroupConfiguration.getId())) {
                    File tmpDirectory = new File(SystemUtils.getJavaIoTmpDir(), repositoryGroupConfiguration.getId()
                            + "/" + repositoryGroupConfiguration.getMergedIndexPath());
                    if (!tmpDirectory.exists()) {
                        synchronized (tmpDirectory.getAbsolutePath()) {
                            if (!tmpDirectory.exists()) {
                                tmpDirectory.mkdirs();
                            }
                        }
                    }
                    mergedRepositoryContents.add(tmpDirectory.getParentFile());
                }
                for (String repository : repositories) {
                    ManagedRepositoryContent managedRepository = null;

                    try {
                        managedRepository = repositoryFactory.getManagedRepositoryContent(repository);
                    } catch (RepositoryNotFoundException e) {
                        throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                                "Invalid managed repository <" + repository + ">: " + e.getMessage());
                    } catch (RepositoryException e) {
                        throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                                "Invalid managed repository <" + repository + ">: " + e.getMessage());
                    }

                    File resourceFile = new File(managedRepository.getRepoRoot(), logicalResource.getPath());
                    if (resourceFile.exists()) {
                        // in case of group displaying index directory doesn't have sense !!
                        String repoIndexDirectory = managedRepository.getRepository().getIndexDirectory();
                        if (StringUtils.isNotEmpty(repoIndexDirectory)) {
                            if (!new File(repoIndexDirectory).isAbsolute()) {
                                repoIndexDirectory = new File(managedRepository.getRepository().getLocation(),
                                        StringUtils.isEmpty(repoIndexDirectory) ? ".indexer" : repoIndexDirectory)
                                                .getAbsolutePath();
                            }
                        }
                        if (StringUtils.isEmpty(repoIndexDirectory)) {
                            repoIndexDirectory = new File(managedRepository.getRepository().getLocation(),
                                    ".indexer").getAbsolutePath();
                        }

                        if (!StringUtils.equals(FilenameUtils.normalize(repoIndexDirectory),
                                FilenameUtils.normalize(resourceFile.getAbsolutePath()))) {
                            // for prompted authentication
                            if (httpAuth.getSecuritySession(request.getSession(true)) != null) {
                                try {
                                    if (isAuthorized(request, repository)) {
                                        mergedRepositoryContents.add(resourceFile);
                                        log.debug("Repository '{}' accessed by '{}'", repository, activePrincipal);
                                    }
                                } catch (DavException e) {
                                    // TODO: review exception handling

                                    log.debug("Skipping repository '{}' for user '{}': {}", managedRepository,
                                            activePrincipal, e.getMessage());

                                }

                            } else {
                                // for the current user logged in
                                try {
                                    if (servletAuth.isAuthorized(activePrincipal, repository,
                                            WebdavMethodUtil.getMethodPermission(request.getMethod()))) {
                                        mergedRepositoryContents.add(resourceFile);
                                        log.debug("Repository '{}' accessed by '{}'", repository, activePrincipal);
                                    }
                                } catch (UnauthorizedException e) {
                                    // TODO: review exception handling

                                    log.debug("Skipping repository '{}' for user '{}': {}", managedRepository,
                                            activePrincipal, e.getMessage());

                                }
                            }
                        }
                    }
                }
            }
        } else {
            throw new UnauthorizedDavException(locator.getRepositoryId(), "User not authorized.");
        }

        ArchivaVirtualDavResource resource = new ArchivaVirtualDavResource(mergedRepositoryContents,
                logicalResource.getPath(), mimeTypes, locator, this);

        // compatibility with MRM-440 to ensure browsing the repository group works ok
        if (resource.isCollection() && !request.getRequestURI().endsWith("/")) {
            throw new BrowserRedirectException(resource.getHref());
        }

        return resource;
    }

    protected String getActivePrincipal(DavServletRequest request) {
        User sessionUser = httpAuth.getSessionUser(request.getSession());
        return sessionUser != null ? sessionUser.getUsername() : UserManager.GUEST_USERNAME;
    }

    /**
     * Check if the current user is authorized to access any of the repos
     *
     * @param request
     * @param repositories
     * @param activePrincipal
     * @return
     */
    private boolean isAllowedToContinue(DavServletRequest request, List<String> repositories,
            String activePrincipal) {
        // when no repositories configured it's impossible to browse nothing !
        // at least make possible to see nothing :-)
        if (repositories == null || repositories.isEmpty()) {
            return true;
        }

        boolean allow = false;

        // if securitySession != null, it means that the user was prompted for authentication
        if (httpAuth.getSecuritySession(request.getSession()) != null) {
            for (String repository : repositories) {
                try {
                    if (isAuthorized(request, repository)) {
                        allow = true;
                        break;
                    }
                } catch (DavException e) {
                    continue;
                }
            }
        } else {
            for (String repository : repositories) {
                try {
                    if (servletAuth.isAuthorized(activePrincipal, repository,
                            WebdavMethodUtil.getMethodPermission(request.getMethod()))) {
                        allow = true;
                        break;
                    }
                } catch (UnauthorizedException e) {
                    continue;
                }
            }
        }

        return allow;
    }

    private File writeMergedMetadataToFile(ArchivaRepositoryMetadata mergedMetadata, String outputFilename)
            throws RepositoryMetadataException, DigesterException, IOException {
        File outputFile = new File(outputFilename);
        if (outputFile.exists()) {
            FileUtils.deleteQuietly(outputFile);
        }

        outputFile.getParentFile().mkdirs();
        RepositoryMetadataWriter.write(mergedMetadata, outputFile);

        createChecksumFile(outputFilename, digestSha1);
        createChecksumFile(outputFilename, digestMd5);

        return outputFile;
    }

    private void createChecksumFile(String path, Digester digester) throws DigesterException, IOException {
        File checksumFile = new File(path + digester.getFilenameExtension());
        if (!checksumFile.exists()) {
            FileUtils.deleteQuietly(checksumFile);
            checksum.createChecksum(new File(path), digester);
        } else if (!checksumFile.isFile()) {
            log.error("Checksum file is not a file.");
        }
    }

    private boolean isProjectReference(String requestedResource) {
        try {
            metadataTools.toVersionedReference(requestedResource);
            return false;
        } catch (RepositoryMetadataException re) {
            return true;
        }
    }

    protected File buildMergedIndexDirectory(List<String> repositories, String activePrincipal,
            DavServletRequest request, RepositoryGroupConfiguration repositoryGroupConfiguration)
            throws DavException {

        try {
            HttpSession session = request.getSession();

            Map<String, TemporaryGroupIndex> temporaryGroupIndexMap = (Map<String, TemporaryGroupIndex>) session
                    .getAttribute(TemporaryGroupIndexSessionCleaner.TEMPORARY_INDEX_SESSION_KEY);
            if (temporaryGroupIndexMap == null) {
                temporaryGroupIndexMap = new HashMap<>();
            }

            TemporaryGroupIndex tmp = temporaryGroupIndexMap.get(repositoryGroupConfiguration.getId());

            if (tmp != null && tmp.getDirectory() != null && tmp.getDirectory().exists()) {
                if (System.currentTimeMillis()
                        - tmp.getCreationTime() > (repositoryGroupConfiguration.getMergedIndexTtl() * 60 * 1000)) {
                    log.debug(MarkerFactory.getMarker("group.merged.index"),
                            "tmp group index '{}' is too old so delete it", repositoryGroupConfiguration.getId());
                    indexMerger.cleanTemporaryGroupIndex(tmp);
                } else {
                    log.debug(MarkerFactory.getMarker("group.merged.index"),
                            "merged index for group '{}' found in cache", repositoryGroupConfiguration.getId());
                    return tmp.getDirectory();
                }
            }

            Set<String> authzRepos = new HashSet<String>();

            String permission = WebdavMethodUtil.getMethodPermission(request.getMethod());

            for (String repository : repositories) {
                try {
                    if (servletAuth.isAuthorized(activePrincipal, repository, permission)) {
                        authzRepos.add(repository);
                        authzRepos.addAll(this.repositorySearch.getRemoteIndexingContextIds(repository));
                    }
                } catch (UnauthorizedException e) {
                    // TODO: review exception handling

                    log.debug("Skipping repository '{}' for user '{}': {}", repository, activePrincipal,
                            e.getMessage());
                }
            }
            log.info("generate temporary merged index for repository group '{}' for repositories '{}'",
                    repositoryGroupConfiguration.getId(), authzRepos);

            File tempRepoFile = Files.createTempDirectory("temp").toFile();
            tempRepoFile.deleteOnExit();

            IndexMergerRequest indexMergerRequest = new IndexMergerRequest(authzRepos, true,
                    repositoryGroupConfiguration.getId(), repositoryGroupConfiguration.getMergedIndexPath(),
                    repositoryGroupConfiguration.getMergedIndexTtl()).mergedIndexDirectory(tempRepoFile)
                            .temporary(true);

            MergedRemoteIndexesTaskRequest taskRequest = new MergedRemoteIndexesTaskRequest(indexMergerRequest,
                    indexMerger);

            MergedRemoteIndexesTask job = new MergedRemoteIndexesTask(taskRequest);

            IndexingContext indexingContext = job.execute().getIndexingContext();

            File mergedRepoDir = indexingContext.getIndexDirectoryFile();
            TemporaryGroupIndex temporaryGroupIndex = new TemporaryGroupIndex(mergedRepoDir,
                    indexingContext.getId(), repositoryGroupConfiguration.getId(),
                    repositoryGroupConfiguration.getMergedIndexTtl()) //
                            .setCreationTime(new Date().getTime());
            temporaryGroupIndexMap.put(repositoryGroupConfiguration.getId(), temporaryGroupIndex);
            session.setAttribute(TemporaryGroupIndexSessionCleaner.TEMPORARY_INDEX_SESSION_KEY,
                    temporaryGroupIndexMap);
            return mergedRepoDir;
        } catch (RepositoryAdminException e) {
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        } catch (IndexMergerException e) {
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        } catch (IOException e) {
            throw new DavException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
        }
    }

    public void setServletAuth(ServletAuthenticator servletAuth) {
        this.servletAuth = servletAuth;
    }

    public void setHttpAuth(HttpAuthenticator httpAuth) {
        this.httpAuth = httpAuth;
    }

    public void setScheduler(RepositoryArchivaTaskScheduler scheduler) {
        this.scheduler = scheduler;
    }

    public void setArchivaConfiguration(ArchivaConfiguration archivaConfiguration) {
        this.archivaConfiguration = archivaConfiguration;
    }

    public void setRepositoryFactory(RepositoryContentFactory repositoryFactory) {
        this.repositoryFactory = repositoryFactory;
    }

    public void setRepositoryRequest(RepositoryRequest repositoryRequest) {
        this.repositoryRequest = repositoryRequest;
    }

    public void setConnectors(RepositoryProxyConnectors connectors) {
        this.connectors = connectors;
    }

    public RemoteRepositoryAdmin getRemoteRepositoryAdmin() {
        return remoteRepositoryAdmin;
    }

    public void setRemoteRepositoryAdmin(RemoteRepositoryAdmin remoteRepositoryAdmin) {
        this.remoteRepositoryAdmin = remoteRepositoryAdmin;
    }

    public ManagedRepositoryAdmin getManagedRepositoryAdmin() {
        return managedRepositoryAdmin;
    }

    public void setManagedRepositoryAdmin(ManagedRepositoryAdmin managedRepositoryAdmin) {
        this.managedRepositoryAdmin = managedRepositoryAdmin;
    }
}