org.structr.mail.DynamicFileDataSource.java Source code

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Here is the source code for org.structr.mail.DynamicFileDataSource.java

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/**
 * Copyright (C) 2010-2018 Structr GmbH
 *
 * This file is part of Structr <http://structr.org>.
 *
 * Structr is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * Structr is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Structr.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.structr.mail;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import javax.activation.DataSource;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import static org.structr.core.GraphObject.logger;
import org.structr.web.entity.File;

/**
 * Data Source for dynamic files which has two purposes
 * 1. Only generate the dynamic file content once (the getInputStream() method is called twice when sending an email. once to determine the Content-Transfer-Encoding and once for the actual content)
 * 2. Generate the dynamic file content at attachment time so the currently store'd variables are used and can be overwritten without losing the file contents
 */
public class DynamicFileDataSource implements DataSource {

    private final String contentType;
    private final String fileName;
    private String fileContent;
    private String encoding = "UTF-8";

    public DynamicFileDataSource(final File fileNode) {

        contentType = fileNode.getContentType();
        fileName = fileNode.getName();

        if (contentType != null) {

            final String charset = StringUtils.substringAfterLast(contentType, "charset=").trim().toUpperCase();
            try {
                if (!"".equals(charset) && Charset.isSupported(charset)) {
                    encoding = charset;
                }
            } catch (IllegalCharsetNameException ice) {
                logger.warn("Charset is not supported '{}'. Using 'UTF-8'", charset);
            }
        }

        try {
            fileContent = IOUtils.toString(fileNode.getInputStream(), encoding);
        } catch (IOException ex) {
            logger.warn("Unable to open input stream for {}: {}", fileName, ex.getMessage());
            fileContent = "";
        }
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return IOUtils.toInputStream(fileContent, encoding);
    }

    @Override
    public OutputStream getOutputStream() throws IOException {
        throw new UnsupportedOperationException("Writing to dynamic file is not allowed.");
    }

    @Override
    public String getContentType() {
        return contentType;
    }

    @Override
    public String getName() {
        return fileName;
    }

}