/*
* Copyright 2013 Brian Thomas Matthews
*
* Licensed 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.
*/
package com.btmatthews.atlas.tenancy.support.filter;
import com.btmatthews.atlas.tenancy.support.domain.Tenant;
import com.btmatthews.atlas.tenancy.support.service.TenantService;
import com.btmatthews.atlas.tenancy.support.spring.TenantContextHolder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
/**
* @author <a href="mailto:brian@btmatthews.com">Brian Thomas Matthews</a>
* @since 1.1.0
*/
public final class TenantFilter implements Filter {
private static final Logger LOGGER = LoggerFactory.getLogger(TenantFilter.class);
/**
* The name of the HTTP header containing the tenant key.
*/
private String headerName;
/**
* The tenant service.
*/
private TenantService tenantService;
/**
* Initialize the filter with the tenant service.
*
* @param service The tenant service.
*/
public TenantFilter(final TenantService service) {
this(service, "X-Atlas-Tenant");
}
/**
* Initialize the filter with the tenant service and the header name.
*
* @param service The tenant service.
* @param name The name of the HTTP header containing the tenant key.
*/
public TenantFilter(final TenantService service,
final String name) {
tenantService = service;
headerName = name;
}
@Override
public void init(final FilterConfig config) {
}
/**
* Examine the HTTP request headers and if the tenant key header (see {@link #headerName}) is present then lookup
* the tenant domain object using the tenant key and store it in the {@link TenantContextHolder} for used by
* tenant scoped beans.
*
* @param request The HTTP request being processed.
* @param response The HTTP response being processed.
* @param chain Used to invoke the next filter in the filter chain.
* @throws ServletException If there was a servlet exception processing the HTTP request.
* @throws IOException If there was an I/O exception processing the HTTP request.
*/
@Override
public void doFilter(
final ServletRequest request,
final ServletResponse response,
final FilterChain chain)
throws ServletException, IOException {
if (request instanceof HttpServletRequest) {
final String headerValue = ((HttpServletRequest) request).getHeader(headerName);
if (headerValue != null) {
final Tenant tenant = tenantService.lookupTenantByKey(headerValue);
if (tenant != null) {
LOGGER.debug("Tenant being set for tenant key {}", headerValue);
TenantContextHolder.push(tenant);
try {
chain.doFilter(request, response);
} finally {
TenantContextHolder.pop();
}
} else {
LOGGER.warn("Tenant not being set because tenant with key {} not found", headerValue);
chain.doFilter(request, response);
}
} else {
LOGGER.warn("Tenant not being set because {} header not present", headerValue);
chain.doFilter(request, response);
}
} else {
LOGGER.warn("Tenant not being set because the request is not a HTTP request");
chain.doFilter(request, response);
}
}
@Override
public void destroy() {
}
}