Examples with Descriptor org.exist.http.Descriptor used on opensource projects

Example 11 with Descriptor

use of org.exist.http.Descriptor in project exist by eXist-db.

the class EXistServlet method doHead.

@Override
protected void doHead(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
    // first, adjust the path
    String path = adjustPath(request);
    // second, perform descriptor actions
    final Descriptor descriptor = Descriptor.getDescriptorSingleton();
    if (descriptor != null && !descriptor.requestsFiltered()) {
        // logs the request if specified in the descriptor
        descriptor.doLogRequestInReplayLog(request);
        // map's the path if a mapping is specified in the descriptor
        path = descriptor.mapPath(path);
    }
    // third, authenticate the user
    final Subject user = authenticate(request, response);
    if (user == null) {
        // You now get a HTTP Authentication challenge if there is no user
        return;
    }
    // fourth, process the request
    try (final DBBroker broker = getPool().get(Optional.of(user));
        final Txn transaction = getPool().getTransactionManager().beginTransaction()) {
        try {
            srvREST.doHead(broker, transaction, request, response, path);
            transaction.commit();
        } catch (final Throwable t) {
            transaction.abort();
            throw t;
        }
    } catch (final BadRequestException e) {
        if (response.isCommitted()) {
            throw new ServletException(e.getMessage(), e);
        }
        response.sendError(HttpServletResponse.SC_BAD_REQUEST, e.getMessage());
    } catch (final PermissionDeniedException e) {
        // Else return a FORBIDDEN Error
        if (user.equals(getDefaultUser())) {
            getAuthenticator().sendChallenge(request, response);
        } else {
            response.sendError(HttpServletResponse.SC_FORBIDDEN, e.getMessage());
        }
    } catch (final NotFoundException e) {
        if (response.isCommitted()) {
            throw new ServletException(e.getMessage(), e);
        }
        response.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage());
    } catch (final EXistException e) {
        if (response.isCommitted()) {
            throw new ServletException(e.getMessage(), e);
        }
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.getMessage());
    } catch (final Throwable e) {
        getLog().error(e);
        throw new ServletException("An unknown error occurred: " + e.getMessage(), e);
    }
}