com.github.ukase.service.PdfRenderer.java Source code

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Here is the source code for com.github.ukase.service.PdfRenderer.java

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/*
 * Copyright (c) 2015 Konstantin Lepa <konstantin+ukase@lepabox.net>
 *
 * This file is part of Ukase.
 *
 *  Ukase 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.
 *
 *   This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.github.ukase.service;

import com.github.ukase.config.WaterMarkSettings;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.DocumentException;
import com.github.ukase.toolkit.ResourceProvider;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import lombok.extern.log4j.Log4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.xhtmlrenderer.pdf.ITextRenderer;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URISyntaxException;

@Service
@Log4j
public class PdfRenderer {
    private final ResourceProvider provider;
    private final WaterMarkSettings waterMark;
    private final Font font;

    @Autowired
    private PdfRenderer(WaterMarkSettings settings, ResourceProvider provider)
            throws IOException, DocumentException {
        this.provider = provider;
        this.waterMark = settings;

        BaseFont baseFont = BaseFont.createFont(provider.getDefaultFont(), BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        this.font = new Font(baseFont, waterMark.getSize(), 0, BaseColor.LIGHT_GRAY);
    }

    public byte[] render(String html, boolean sample) throws DocumentException, IOException, URISyntaxException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ITextRenderer renderer = provider.getRenderer(html);

        char pdfVersion = renderer.getPDFVersion();
        renderer.createPDF(baos, true);
        renderer.finishPDF();

        if (sample) {
            addSampleWatermark(baos, pdfVersion);
        }

        return baos.toByteArray();
    }

    private void addSampleWatermark(ByteArrayOutputStream baos, char pdfVersion)
            throws IOException, DocumentException {
        PdfReader reader = new PdfReader(baos.toByteArray());
        baos.reset();
        Phrase phrase = new Phrase(waterMark.getText(), font);
        PdfStamper stamper = new PdfStamper(reader, baos, pdfVersion);
        for (int i = 1; i <= reader.getNumberOfPages(); i++) {
            PdfContentByte canvas = stamper.getUnderContent(i);
            ColumnText.showTextAligned(canvas, Element.ALIGN_CENTER, phrase, waterMark.getX(), waterMark.getY(),
                    waterMark.getDegree());
        }
        stamper.close();
        reader.close();
    }
}