org.xlcloud.console.controllers.utils.RcFileBuilder Maven / Gradle / Ivy

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/*
 * Copyright 2012 AMG.lab, a Bull Group Company
 * 
 * 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 org.xlcloud.console.controllers.utils;

import java.io.IOException;
import java.io.InputStream;
import java.util.regex.Pattern;

import javax.inject.Inject;
import javax.inject.Named;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.primefaces.model.DefaultStreamedContent;
import org.primefaces.model.StreamedContent;

import org.xlcloud.service.OsCredentials;
import org.xlcloud.service.api.OsCredentialsApi;

/**
 * Class which is used to build rc-files from the template file.
 * @author Konrad Król, AMG.net
 */
@Named
public class RcFileBuilder {

    public static final String OS_AUTH_URL_ELEMENT = "#{OS_AUTH_URL}";
    public static final String OS_PROJECT_ID_ELEMENT = "#{OS_TENANT_ID}";
    public static final String OS_PROJECT_NAME_ELEMENT = "#{OS_TENANT_NAME}";
    public static final String OS_USERNAME_ELEMENT = "#{OS_USERNAME}";
    
    public static final String OPENRC_TEMPLATE_RESOURCE_PATH = "file-templates/openrc.sh";
    public static final String TARGET_FILE_NAME = "openrc.sh";
    
    @Inject
    private OsCredentialsApi osCredentialsApi;
    
    /**
     * It builds rc-file from the template localized under {@link RcFileBuilder#OPENRC_TEMPLATE_RESOURCE_PATH}.
     * Os-credentials are retrieved from the XMS api method: {@link OsCredentialsApi#getOsCredentials(Long, Long)}.
     * 
     * @param userId id of the user whose os-credentials should be retrieved
     * @param projectId id of the project
     * @return streamed content with complete rc-file
     * @throws IOException if template could not be read
     */
    public StreamedContent buildRcFile(Long userId, Long projectId) throws IOException {
        InputStream rcTemplateFile = this.getClass().getClassLoader().getResourceAsStream(OPENRC_TEMPLATE_RESOURCE_PATH);
        String rcFileContent = IOUtils.toString(rcTemplateFile);
        
        OsCredentials osCredentials = osCredentialsApi.getOsCredentials(userId, projectId);
        
        rcFileContent = replaceTemplate(rcFileContent, OS_AUTH_URL_ELEMENT, osCredentials.getAuthUrl());
        rcFileContent = replaceTemplate(rcFileContent, OS_PROJECT_ID_ELEMENT, osCredentials.getOsProjectId());
        rcFileContent = replaceTemplate(rcFileContent, OS_PROJECT_NAME_ELEMENT, osCredentials.getOsProjectName());
        rcFileContent = replaceTemplate(rcFileContent, OS_USERNAME_ELEMENT, osCredentials.getUsername());
        
        InputStream stream = IOUtils.toInputStream(rcFileContent);
        return new DefaultStreamedContent(stream, "application/octet-stream", TARGET_FILE_NAME);
    }
    
    private static String replaceTemplate(String template, String element, String replacement) {
        return template.replaceAll(Pattern.quote(element), StringUtils.defaultString(replacement));
    }
}