brooklyn.entity.proxy.nginx.NginxConfigTemplate Maven / Gradle / Ivy

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/*
 * Copyright 2012-2013 by Cloudsoft Corp.
 *
 * 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 brooklyn.entity.proxy.nginx;

import java.util.Collection;
import java.util.Map;

import brooklyn.entity.proxy.ProxySslConfig;
import brooklyn.util.ResourceUtils;
import brooklyn.util.collections.MutableMap;
import brooklyn.util.text.Strings;
import brooklyn.util.text.TemplateProcessor;

import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Multimap;

/**
 * Processes a FreeMarker template for an {@link NginxController} configuration file.
 */
public class NginxConfigTemplate {

    private NginxDriver driver;

    public static NginxConfigTemplate generator(NginxDriver driver) {
        return new NginxConfigTemplate(driver);
    }

    private NginxConfigTemplate(NginxDriver driver) {
        this.driver = driver;
    }

    public String configFile() {
        // Check template URL exists
        String templateUrl = driver.getEntity().getConfig(NginxController.SERVER_CONF_TEMPLATE_URL);
        ResourceUtils.create(this).checkUrlExists(templateUrl);

        // Check SSL configuration
        ProxySslConfig ssl = driver.getEntity().getConfig(NginxController.SSL_CONFIG);
        if (ssl != null && Strings.isEmpty(ssl.getCertificateDestination()) && Strings.isEmpty(ssl.getCertificateSourceUrl())) {
            throw new IllegalStateException("ProxySslConfig can't have a null certificateDestination and null certificateSourceUrl. One or both need to be set");
        }

        // For mapping by URL
        Iterable mappings = ((NginxController) driver.getEntity()).getUrlMappings();
        Multimap mappingsByDomain = LinkedHashMultimap.create();
        for (UrlMapping mapping : mappings) {
            Collection addrs = mapping.getAttribute(UrlMapping.TARGET_ADDRESSES);
            if (addrs != null && addrs.size() > 0) {
                mappingsByDomain.put(mapping.getDomain(), mapping);
            }
        }
        Map substitutions = MutableMap.builder()
                .putIfNotNull("ssl", ssl)
                .put("urlMappings", mappings)
                .put("domainMappings", mappingsByDomain)
                .build();

        // Get template contents and process
        String contents = ResourceUtils.create(driver.getEntity()).getResourceAsString(templateUrl);
        return TemplateProcessor.processTemplateContents(contents, driver, substitutions);
    }

}