cf.spring.servicebroker.ServiceBrokerConfiguration.java Source code

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Here is the source code for cf.spring.servicebroker.ServiceBrokerConfiguration.java

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/*
 *   Copyright (c) 2014 Intellectual Reserve, Inc.  All rights reserved.
 *
 *   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 cf.spring.servicebroker;

import cf.spring.HttpBasicAuthenticator;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanCreationException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanExpressionContext;
import org.springframework.beans.factory.config.BeanExpressionResolver;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportAware;
import org.springframework.context.annotation.Scope;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.util.MultiValueMap;
import org.springframework.web.HttpRequestHandler;
import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping;

import javax.inject.Provider;
import java.util.HashMap;
import java.util.Map;

/**
 * Configures all the service brokers.
 *
 * @author Mike Heath <elcapo@gmail.com>
 */
@Configuration
class ServiceBrokerConfiguration
        implements ImportAware, ApplicationContextAware, BeanFactoryAware, InitializingBean {

    private ApplicationContext context;
    private BeanExpressionResolver expressionResolver;
    private BeanExpressionContext expressionContext;
    private HttpBasicAuthenticator authenticator;

    private Map<String, HttpRequestHandler> urlMap = new HashMap<>();

    @Override
    public void setImportMetadata(AnnotationMetadata importMetadata) {
        final MultiValueMap<String, Object> annotationAttributes = importMetadata
                .getAllAnnotationAttributes(EnableServiceBroker.class.getName());
        final String username = evaluate(annotationAttributes.getFirst("username").toString());
        final String password = evaluate(annotationAttributes.getFirst("password").toString());
        if (username == null) {
            throw new IllegalArgumentException("username cannot be null");
        }
        if (password == null) {
            throw new IllegalArgumentException("password cannot be null");
        }
        authenticator = new HttpBasicAuthenticator("", username, password);
    }

    private String evaluate(String expression) {
        return (String) expressionResolver.evaluate(expression, expressionContext);
    }

    @Bean
    HttpBasicAuthenticator serviceBrokerAuthenticator() {
        return authenticator;
    }

    @Bean
    SimpleUrlHandlerMapping catalogHandlerMapping() {
        final SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
        handlerMapping.setUrlMap(urlMap);
        handlerMapping.setOrder(0);
        return handlerMapping;
    }

    @Bean
    @Scope(BeanDefinition.SCOPE_PROTOTYPE)
    Catalog serviceBrokerCatalog() {
        return catalogProvider().getCatalogAccessor().createCatalog();
    }

    @Bean
    HttpRequestHandler catalogHandler() {
        return new CatalogHandler(serviceBrokerAuthenticator(), new Provider<Catalog>() {
            @Override
            public Catalog get() {
                return serviceBrokerCatalog();
            }
        });
    }

    @Bean
    ServiceBrokerHandler serviceBrokerHandler() {
        return new ServiceBrokerHandler(serviceBrokerAuthenticator(), catalogProvider());
    }

    @Bean
    CatalogAccessorProvider catalogProvider() {
        return new CompositeCatalogAccessorProvider(context.getBeansOfType(CatalogAccessorProvider.class).values());
    }

    @Bean
    CatalogAccessorProvider annotationCatalogProvider() {
        return new AnnotationCatalogAccessorProvider(expressionResolver, expressionContext);
    }

    @Bean
    CatalogAccessorProvider dynamicCatalogProvider() {
        return new DynamicCatalogAccessorProvider();
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        urlMap.put(Constants.CATALOG_URI, catalogHandler());
        urlMap.put("/v2/service_instances/**", serviceBrokerHandler());
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.context = applicationContext;
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        if (beanFactory instanceof ConfigurableBeanFactory) {
            final ConfigurableBeanFactory cbf = (ConfigurableBeanFactory) beanFactory;
            expressionResolver = new BeanExpressionResolver() {
                @Override
                public Object evaluate(String expression, BeanExpressionContext beanExpressionContext)
                        throws BeansException {
                    final Object value = cbf.getBeanExpressionResolver().evaluate(expression, expressionContext);

                    return value == null ? null : value.toString();
                }
            };
            expressionContext = new BeanExpressionContext(cbf,
                    cbf.getRegisteredScope(ConfigurableBeanFactory.SCOPE_PROTOTYPE));
        } else {
            throw new BeanCreationException(
                    getClass().getName() + " can only be used with a " + ConfigurableBeanFactory.class.getName());
        }
    }

}