source: ComponentRegistry/trunk/ComponentRegistry/src/main/java/clarin/cmdi/componentregistry/rest/ComponentRegistryRestService.java @ 1604

package clarin.cmdi.componentregistry.rest;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.security.Principal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.SecurityContext;
import javax.ws.rs.core.StreamingOutput;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.core.Response.Status;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import clarin.cmdi.componentregistry.ComponentRegistry;
import clarin.cmdi.componentregistry.ComponentRegistryException;
import clarin.cmdi.componentregistry.ComponentRegistryFactory;
import clarin.cmdi.componentregistry.DeleteFailedException;
import clarin.cmdi.componentregistry.UserCredentials;
import clarin.cmdi.componentregistry.UserUnauthorizedException;
import clarin.cmdi.componentregistry.components.CMDComponentSpec;
import clarin.cmdi.componentregistry.model.AbstractDescription;
import clarin.cmdi.componentregistry.model.ComponentDescription;
import clarin.cmdi.componentregistry.model.ProfileDescription;
import clarin.cmdi.componentregistry.model.RegisterResponse;

import com.sun.jersey.multipart.FormDataParam;
import com.sun.jersey.spi.inject.Inject;

@Path("/registry")
public class ComponentRegistryRestService {

    @Context
    private UriInfo uriInfo;
    @Context
    private SecurityContext security;
    @Context
    private HttpServletRequest request;
    private final static Logger LOG = LoggerFactory.getLogger(ComponentRegistryRestService.class);
    public static final String DATA_FORM_FIELD = "data";
    public static final String NAME_FORM_FIELD = "name";
    public static final String DESCRIPTION_FORM_FIELD = "description";
    public static final String GROUP_FORM_FIELD = "group";
    public static final String DOMAIN_FORM_FIELD = "domainName";
    public static final String USERSPACE_PARAM = "userspace";
    public static final String METADATA_EDITOR_PARAM = "mdEditor";
    @Inject(value = "componentRegistryFactory")
    private ComponentRegistryFactory componentRegistryFactory;

    private ComponentRegistry getRegistry(boolean userspace) {
        Principal userPrincipal = security.getUserPrincipal();
        UserCredentials userCredentials = getUserCredentials(userPrincipal);
        return getRegistry(userspace, userCredentials);
    }

    private ComponentRegistry getRegistry(boolean userspace, UserCredentials userCredentials) {
        return componentRegistryFactory.getComponentRegistry(userspace, userCredentials);
    }

    private Principal checkAndGetUserPrincipal() {
        Principal principal = security.getUserPrincipal();
        if (principal == null) {
            throw new IllegalArgumentException("no user principal found.");
        }
        return principal;
    }

    private UserCredentials getUserCredentials(Principal userPrincipal) {
        UserCredentials userCredentials = null;
        if (userPrincipal != null) {
            userCredentials = new UserCredentials(userPrincipal);
        }
        return userCredentials;
    }

    @GET
    @Path("/components")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public List<ComponentDescription> getRegisteredComponents(@QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) throws ComponentRegistryException {
        long start = System.currentTimeMillis();
        List<ComponentDescription> components = getRegistry(userspace).getComponentDescriptions();
        LOG.info("Releasing " + components.size() + " registered components into the world (" + (System.currentTimeMillis() - start)
                + " millisecs)");
        return components;
    }

    @GET
    @Path("/profiles")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public List<ProfileDescription> getRegisteredProfiles(@QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace,
            @QueryParam(METADATA_EDITOR_PARAM) @DefaultValue("false") boolean metadataEditor) throws ComponentRegistryException {
        long start = System.currentTimeMillis();
        
        List<ProfileDescription> profiles;
        if (metadataEditor) {
            profiles = getRegistry(userspace).getProfileDescriptionsForMetadaEditor();
        } else {
            profiles = getRegistry(userspace).getProfileDescriptions();
        }
        
        LOG.info("Releasing " + profiles.size() + " registered profiles into the world (" + (System.currentTimeMillis() - start)
                + " millisecs)");
        return profiles;
    }

    @GET
    @Path("/components/{componentId}")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public CMDComponentSpec getRegisteredComponent(@PathParam("componentId") String componentId,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) throws ComponentRegistryException {
        LOG.info("Component with id: " + componentId + " is requested.");
        return getRegistry(userspace).getMDComponent(componentId);
    }

    @GET
    @Path("/components/{componentId}/{rawType}")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML})
    public Response getRegisteredComponentRawType(@PathParam("componentId") final String componentId, @PathParam("rawType") String rawType) {
        LOG.info("Component with id: " + componentId + " and rawType:" + rawType + " is requested.");
        StreamingOutput result = null;
        try {
            final ComponentRegistry registry = findRegistry(componentId, new ComponentClosure());
            if (registry == null) {
                return Response.status(Status.NOT_FOUND).entity("Id: " + componentId + " is not registered, cannot create data.").build();
            }
            ComponentDescription desc = registry.getComponentDescription(componentId);
            checkAndThrowDescription(desc, componentId);
            String fileName = desc.getName() + "." + rawType;
            if ("xml".equalsIgnoreCase(rawType)) {
                result = new StreamingOutput() {

                    @Override
                    public void write(OutputStream output) throws IOException, WebApplicationException {
                        try {
                            registry.getMDComponentAsXml(componentId, output);
                        } catch (ComponentRegistryException e) {
                            LOG.info("Could not retrieve component", e);
                            throw new WebApplicationException(e, Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build());
                        }
                    }
                };
            } else if ("xsd".equalsIgnoreCase(rawType)) {
                result = new StreamingOutput() {

                    @Override
                    public void write(OutputStream output) throws IOException, WebApplicationException {
                        try {
                            registry.getMDComponentAsXsd(componentId, output);
                        } catch (ComponentRegistryException e) {
                            LOG.info("Could not retrieve component", e);
                            throw new WebApplicationException(e, Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build());
                        }

                    }
                };
            } else {
                throw new WebApplicationException(Response.serverError().entity(
                        "unsupported rawType: " + rawType + " (only xml or xsd are supported)").build());
            }
            return createDownloadResponse(result, fileName);
        } catch (ComponentRegistryException e) {
            LOG.info("Could not retrieve component", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        }
    }

    public ComponentRegistry findRegistry(String id, RegistryClosure<? extends AbstractDescription> clos) throws ComponentRegistryException {
        AbstractDescription desc = null;
        ComponentRegistry result = getRegistry(false);
        desc = clos.getDescription(result, id);
        if (desc == null) {
            List<ComponentRegistry> userRegs = componentRegistryFactory.getAllUserRegistries();
            for (ComponentRegistry reg : userRegs) {
                desc = clos.getDescription(reg, id);
                if (desc != null) {
                    result = reg;
                    break;
                }
            }
        }
        return result;
    }

    @GET
    @Path("/profiles/{profileId}")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public CMDComponentSpec getRegisteredProfile(@PathParam("profileId") String profileId,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) throws ComponentRegistryException {
        LOG.info("Profile with id: " + profileId + " is requested.");
        return getRegistry(userspace).getMDProfile(profileId);
    }

    @GET
    @Path("/components/usage/{componentId}")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public List<AbstractDescription> getComponentUsage(@PathParam("componentId") String componentId, @QueryParam(USERSPACE_PARAM) @DefaultValue("true") boolean userspace) throws ComponentRegistryException {
        try {
            final long start = System.currentTimeMillis();
            ComponentRegistry registry = getRegistry(userspace);
            List<ComponentDescription> components = registry.getUsageInComponents(componentId);
            List<ProfileDescription> profiles = registry.getUsageInProfiles(componentId);

            LOG.info("Found " + components.size() + " components and " + profiles.size() + " profiles that use component " + componentId
                    + " (" + (System.currentTimeMillis() - start) + " millisecs)");

            List<AbstractDescription> usages = new ArrayList<AbstractDescription>(components.size() + profiles.size());
            usages.addAll(components);
            usages.addAll(profiles);

            return usages;
        } catch (ComponentRegistryException e) {
            LOG.info("Could not retrieve profile usage", e);
            throw e;
        }
    }

    /**
     * 
     * Purely helper method for my front-end (FLEX) which only does post/get requests. The query param is checked and the "proper" method is
     * called.
     * @param profileId
     * @param method
     * @return
     */
    @POST
    @Path("/profiles/{profileId}")
    public Response manipulateRegisteredProfile(@PathParam("profileId") String profileId, @FormParam("method") String method,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) {
        if ("delete".equalsIgnoreCase(method)) {
            return deleteRegisteredProfile(profileId, userspace);
        } else {
            return Response.ok().build();
        }
    }

    @POST
    @Path("/profiles/{profileId}/publish")
    @Consumes("multipart/form-data")
    public Response publishRegisteredProfile(@PathParam("profileId") String profileId, @FormDataParam(DATA_FORM_FIELD) InputStream input,
            @FormDataParam(NAME_FORM_FIELD) String name, @FormDataParam(DESCRIPTION_FORM_FIELD) String description,
            @FormDataParam(GROUP_FORM_FIELD) String group, @FormDataParam(DOMAIN_FORM_FIELD) String domainName) {
        Principal principal = checkAndGetUserPrincipal();
        try {
            ProfileDescription desc = getRegistry(true).getProfileDescription(profileId);
            if (desc != null) {
                updateDescription(desc, name, description, domainName, group);
                return register(input, desc, getUserCredentials(principal), true, new PublishAction(principal));
            } else {
                LOG.error("Update of nonexistent id (" + profileId + ") failed.");
                return Response.serverError().entity("Invalid id, cannot update nonexistent profile").build();
            }
        } catch (ComponentRegistryException e) {
            LOG.info("Could not retrieve component", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        }
    }

    @POST
    @Path("/profiles/{profileId}/update")
    @Consumes("multipart/form-data")
    public Response updateRegisteredProfile(@PathParam("profileId") String profileId,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace, @FormDataParam(DATA_FORM_FIELD) InputStream input,
            @FormDataParam(NAME_FORM_FIELD) String name, @FormDataParam(DESCRIPTION_FORM_FIELD) String description,
            @FormDataParam(GROUP_FORM_FIELD) String group, @FormDataParam(DOMAIN_FORM_FIELD) String domainName) {
        Principal principal = checkAndGetUserPrincipal();
        UserCredentials userCredentials = getUserCredentials(principal);
        try {
            ProfileDescription desc = getRegistry(userspace).getProfileDescription(profileId);
            if (desc != null) {
                updateDescription(desc, name, description, domainName, group);
                return register(input, desc, userCredentials, userspace, new UpdateAction(principal));
            } else {
                LOG.error("Update of nonexistent id (" + profileId + ") failed.");
                return Response.serverError().entity("Invalid id, cannot update nonexistent profile").build();
            }
        } catch (ComponentRegistryException e) {
            LOG.info("Could not retrieve component", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        }
    }

    /**
     * 
     * Purely helper method for my front-end (FLEX) which van only do post/get requests. The query param is checked and the "proper" method
     * is called.
     * @param componentId
     * @param method
     * @return
     */
    @POST
    @Path("/components/{componentId}")
    public Response manipulateRegisteredComponent(@PathParam("componentId") String componentId, @FormParam("method") String method,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) {
        if ("delete".equalsIgnoreCase(method)) {
            return deleteRegisteredComponent(componentId, userspace);
        } else {
            return Response.ok().build();
        }
    }

    @POST
    @Path("/components/{componentId}/publish")
    @Consumes("multipart/form-data")
    public Response publishRegisteredComponent(@PathParam("componentId") String componentId,
            @FormDataParam(DATA_FORM_FIELD) InputStream input, @FormDataParam(NAME_FORM_FIELD) String name,
            @FormDataParam(DESCRIPTION_FORM_FIELD) String description, @FormDataParam(GROUP_FORM_FIELD) String group,
            @FormDataParam(DOMAIN_FORM_FIELD) String domainName) {
        Principal principal = checkAndGetUserPrincipal();
        try {
            ComponentDescription desc = getRegistry(true).getComponentDescription(componentId);
            if (desc != null) {
                updateDescription(desc, name, description, domainName, group);
                return register(input, desc, getUserCredentials(principal), true, new PublishAction(principal));
            } else {
                LOG.error("Update of nonexistent id (" + componentId + ") failed.");
                return Response.serverError().entity("Invalid id, cannot update nonexistent profile").build();
            }
        } catch (ComponentRegistryException e) {
            LOG.info("Could not retrieve component", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        }
    }

    @POST
    @Path("/components/{componentId}/update")
    @Consumes("multipart/form-data")
    public Response updateRegisteredComponent(@PathParam("componentId") String componentId,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace, @FormDataParam(DATA_FORM_FIELD) InputStream input,
            @FormDataParam(NAME_FORM_FIELD) String name, @FormDataParam(DESCRIPTION_FORM_FIELD) String description,
            @FormDataParam(GROUP_FORM_FIELD) String group, @FormDataParam(DOMAIN_FORM_FIELD) String domainName) {
        Principal principal = checkAndGetUserPrincipal();
        try {
            ComponentDescription desc = getRegistry(userspace).getComponentDescription(componentId);
            if (desc != null) {
                updateDescription(desc, name, description, domainName, group);
                return register(input, desc, getUserCredentials(principal), userspace, new UpdateAction(principal));
            } else {
                LOG.error("Update of nonexistent id (" + componentId + ") failed.");
                return Response.serverError().entity("Invalid id, cannot update nonexistent component").build();
            }
        } catch (ComponentRegistryException e) {
            LOG.info("Could not retrieve component", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        }
    }

    private void updateDescription(AbstractDescription desc, String name, String description, String domainName, String group) {
        desc.setName(name);
        desc.setDescription(description);
        desc.setDomainName(domainName);
        desc.setGroupName(group);
        desc.setRegistrationDate(AbstractDescription.createNewDate());
    }

    @DELETE
    @Path("/components/{componentId}")
    public Response deleteRegisteredComponent(@PathParam("componentId") String componentId,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) {
        Principal principal = checkAndGetUserPrincipal();
        ComponentRegistry registry = getRegistry(userspace);
        LOG.info("Component with id: " + componentId + " set for deletion.");
        try {
            registry.deleteMDComponent(componentId, principal, false);
        } catch (DeleteFailedException e) {
            LOG.info("Component with id: " + componentId + " deletion failed.", e);
            return Response.status(Status.FORBIDDEN).entity("" + e.getMessage()).build();
        } catch (ComponentRegistryException e) {
            LOG.info("Component with id: " + componentId + " deletion failed.", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        } catch (IOException e) {
            LOG.info("Component with id: " + componentId + " deletion failed.", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        } catch (UserUnauthorizedException e) {
            LOG.info("Component with id: " + componentId + " deletion failed: " + e.getMessage());
            return Response.serverError().status(Status.UNAUTHORIZED).entity("" + e.getMessage()).build();
        }
        LOG.info("Component with id: " + componentId + " deleted.");
        return Response.ok().build();
    }

    @DELETE
    @Path("/profiles/{profileId}")
    public Response deleteRegisteredProfile(@PathParam("profileId") String profileId,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) {
        Principal principal = checkAndGetUserPrincipal();
        LOG.info("Profile with id: " + profileId + " set for deletion.");
        try {
            getRegistry(userspace).deleteMDProfile(profileId, principal);
        } catch (DeleteFailedException e) {
            LOG.info("Profile with id: " + profileId + " deletion failed: " + e.getMessage());
            return Response.serverError().status(Status.FORBIDDEN).entity("" + e.getMessage()).build();
        } catch (ComponentRegistryException e) {
            LOG.info("Could not retrieve component", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        } catch (IOException e) {
            LOG.info("Profile with id: " + profileId + " deletion failed.", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        } catch (UserUnauthorizedException e) {
            LOG.info("Profile with id: " + profileId + " deletion failed: " + e.getMessage());
            return Response.serverError().status(Status.UNAUTHORIZED).entity("" + e.getMessage()).build();
        }
        LOG.info("Profile with id: " + profileId + " deleted.");
        return Response.ok().build();
    }

    @GET
    @Path("/profiles/{profileId}/{rawType}")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML})
    public Response getRegisteredProfileRawType(@PathParam("profileId") final String profileId, @PathParam("rawType") String rawType) {
        LOG.info("Profile with id: " + profileId + " and rawType:" + rawType + " is requested.");
        StreamingOutput result = null;
        try {
            final ComponentRegistry registry = findRegistry(profileId, new ProfileClosure());
            if (registry == null) {
                return Response.status(Status.NOT_FOUND).entity("Id: " + profileId + " is not registered, cannot create data.").build();
            }
            ProfileDescription desc = registry.getProfileDescription(profileId);
            checkAndThrowDescription(desc, profileId);
            String fileName = desc.getName() + "." + rawType;

            if ("xml".equalsIgnoreCase(rawType)) {
                result = new StreamingOutput() {

                    @Override
                    public void write(OutputStream output) throws IOException, WebApplicationException {
                        try {
                            registry.getMDProfileAsXml(profileId, output);
                        } catch (ComponentRegistryException e) {
                            LOG.warn("Could not retrieve component", e);
                            throw new WebApplicationException(e, Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build());
                        }
                    }
                };
            } else if ("xsd".equalsIgnoreCase(rawType)) {
                result = new StreamingOutput() {

                    @Override
                    public void write(OutputStream output) throws IOException, WebApplicationException {
                        try {
                            registry.getMDProfileAsXsd(profileId, output);
                        } catch (ComponentRegistryException e) {
                            LOG.warn("Could not retrieve component", e);
                            throw new WebApplicationException(e, Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build());
                        }
                    }
                };
            } else {
                throw new WebApplicationException(Response.serverError().entity(
                        "unsupported rawType: " + rawType + " (only xml or xsd are supported)").build());
            }
            return createDownloadResponse(result, fileName);
        } catch (ComponentRegistryException e) {
            LOG.info("Could not retrieve component", e);
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        }
    }

    private void checkAndThrowDescription(AbstractDescription desc, String id) {
        if (desc == null) {
            throw new WebApplicationException(Response.serverError().entity("Incorrect id:" + id + "cannot handle request").build());
        }
    }

    private Response createDownloadResponse(StreamingOutput result, String fileName) {
        //Making response so it triggers browsers native save as dialog.
        Response response = Response.ok().type("application/x-download").header("Content-Disposition",
                "attachment; filename=\"" + fileName + "\"").entity(result).build();
        return response;

    }

    @POST
    @Path("/profiles")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    @Consumes("multipart/form-data")
    public Response registerProfile(@FormDataParam(DATA_FORM_FIELD) InputStream input, @FormDataParam(NAME_FORM_FIELD) String name,
            @FormDataParam(DESCRIPTION_FORM_FIELD) String description, @FormDataParam(GROUP_FORM_FIELD) String group, @FormDataParam(DOMAIN_FORM_FIELD) String domainName,
            @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) {
        Principal principal = checkAndGetUserPrincipal();
        UserCredentials userCredentials = getUserCredentials(principal);
        ProfileDescription desc = createNewProfileDescription();
        desc.setCreatorName(userCredentials.getDisplayName());
        desc.setUserId(userCredentials.getPrincipalName()); // Hash used to be created here, now Id is constructed by impl
        desc.setName(name);
        desc.setDescription(description);
        desc.setGroupName(group);
        desc.setDomainName(domainName);
        LOG.info("Trying to register Profile: " + desc);
        return register(input, desc, userCredentials, userspace, new NewAction());
    }

    @POST
    @Path("/components")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    @Consumes("multipart/form-data")
    public Response registerComponent(@FormDataParam(DATA_FORM_FIELD) InputStream input, @FormDataParam(NAME_FORM_FIELD) String name,
            @FormDataParam(DESCRIPTION_FORM_FIELD) String description, @FormDataParam(GROUP_FORM_FIELD) String group,
            @FormDataParam(DOMAIN_FORM_FIELD) String domainName, @QueryParam(USERSPACE_PARAM) @DefaultValue("false") boolean userspace) {
        Principal principal = checkAndGetUserPrincipal();
        UserCredentials userCredentials = getUserCredentials(principal);
        ComponentDescription desc = createNewComponentDescription();
        desc.setCreatorName(userCredentials.getDisplayName());
        desc.setUserId(userCredentials.getPrincipalName()); // Hash used to be created here, now Id is constructed by impl
        desc.setName(name);
        desc.setDescription(description);
        desc.setGroupName(group);
        desc.setDomainName(domainName);
        LOG.info("Trying to register Component: " + desc);
        return register(input, desc, userCredentials, userspace, new NewAction());
    }

    @GET
    @Path("/pingSession")
    @Produces({MediaType.TEXT_XML, MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public Response pingSession() {
        boolean stillActive = false;
        Principal userPrincipal = security.getUserPrincipal();
        LOG.info("ping by user: " + (userPrincipal == null ? "null" : userPrincipal.getName()));
        if (request != null) {
            if (userPrincipal != null && !ComponentRegistryFactory.ANONYMOUS_USER.equals(userPrincipal.getName())) {
                stillActive = !((HttpServletRequest) request).getSession().isNew();
            }
        }
        return Response.ok().entity("<session stillActive=\"" + stillActive + "\"/>").build();
    }

    private Response register(InputStream input, AbstractDescription desc, UserCredentials userCredentials, boolean userspace,
            RegisterAction action) {
        try {
            ComponentRegistry registry = getRegistry(userspace, userCredentials);
            DescriptionValidator descriptionValidator = new DescriptionValidator(desc);
            MDValidator validator = new MDValidator(input, desc, registry, getRegistry(true), componentRegistryFactory.getPublicRegistry());
            RegisterResponse response = new RegisterResponse();
            response.setIsInUserSpace(userspace);
            validate(response, descriptionValidator, validator);
            if (response.getErrors().isEmpty()) {
                CMDComponentSpec spec = validator.getCMDComponentSpec();
                int returnCode = action.execute(desc, spec, response, registry);
                if (returnCode == 0) {
                    response.setRegistered(true);
                    response.setDescription(desc);
                } else {
                    response.setRegistered(false);
                    response.addError("Unable to register at this moment. Internal server error.");
                }
            } else {
                LOG.info("Registration failed with validation errors:" + Arrays.toString(response.getErrors().toArray()));
                response.setRegistered(false);
            }
            response.setIsProfile(desc.isProfile());
            return Response.ok(response).build();
        } finally {
            try {
                input.close();//either we read the input or there was an exception, we need to close it.
            } catch (IOException e) {
                LOG.error("Error when closing inputstream: ", e);
            }
        }
    }

    private ComponentDescription createNewComponentDescription() {
        ComponentDescription desc = ComponentDescription.createNewDescription();
        desc.setHref(createXlink(desc.getId()));
        return desc;
    }

    private ProfileDescription createNewProfileDescription() {
        ProfileDescription desc = ProfileDescription.createNewDescription();
        desc.setHref(createXlink(desc.getId()));
        return desc;
    }

    private String createXlink(String id) {
        URI uri = uriInfo.getRequestUriBuilder().path(id).build();
        return uri.toString();
    }

    private void validate(RegisterResponse response, Validator... validators) {
        for (Validator validator : validators) {
            if (!validator.validate()) {
                for (String error : validator.getErrorMessages()) {
                    response.addError(error);
                }
            }
        }
    }

    /**
     * @param componentRegistryFactory the componentRegistryFactory to set
     */
    public void setComponentRegistryFactory(ComponentRegistryFactory componentRegistryFactory) {
        this.componentRegistryFactory = componentRegistryFactory;
    }
}