org.pdfgal.pdfgalweb.validators.WatermarkValidator.java Source code

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Here is the source code for org.pdfgal.pdfgalweb.validators.WatermarkValidator.java

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/*
 * PDFGalWeb
 * Copyright (c) 2014, Alejandro Pernas Pan, All rights reserved.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
    
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */

package org.pdfgal.pdfgalweb.validators;

import org.apache.commons.lang3.StringUtils;
import org.pdfgal.pdfgal.model.enumerated.WatermarkPosition;
import org.pdfgal.pdfgal.validator.PDFGalValidator;
import org.pdfgal.pdfgalweb.forms.WatermarkForm;
import org.pdfgal.pdfgalweb.model.enumerated.PDFEncryptionType;
import org.pdfgal.pdfgalweb.utils.FileUtils;
import org.pdfgal.pdfgalweb.validators.utils.ValidatorUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;
import org.springframework.web.multipart.MultipartFile;

@Component
public class WatermarkValidator implements Validator {

    @Autowired
    private FileUtils fileUtils;

    @Autowired
    private PDFGalValidator pdfGalValidator;

    @Autowired
    private ValidatorUtils validatorUtils;

    @Override
    public boolean supports(final Class<?> clazz) {
        return WatermarkForm.class.equals(clazz);
    }

    @Override
    public void validate(final Object target, final Errors errors) {

        final WatermarkForm watermarkForm = (WatermarkForm) target;

        // File validation
        final MultipartFile file = watermarkForm.getFile();
        this.validatorUtils.validateFile(file, errors, PDFEncryptionType.NON_ENCRYPTED);

        // Text validation
        ValidationUtils.rejectIfEmptyOrWhitespace(errors, "text", "common.validator.required");
        this.validateTextLenght(watermarkForm.getText(), watermarkForm.getWatermarkPosition(), file, errors);

        // Pages validation
        if (!this.validatorUtils.validateConcretePages(watermarkForm.getPages(), file, ",", "-", false, false)) {
            errors.rejectValue("pages", "watermark.validator.pages");
        }
    }

    /**
     * Valdiation of text length.
     * 
     * @param text
     * @param watermarkPosition
     * @param file
     * @param errors
     */
    private void validateTextLenght(final String text, final WatermarkPosition watermarkPosition,
            final MultipartFile file, final Errors errors) {

        if (StringUtils.isNotEmpty(text) && watermarkPosition != null && file != null && errors != null) {

            final Integer textLenght = text.length();
            boolean excesiveLength = true;

            if (WatermarkPosition.CENTER.equals(watermarkPosition)) {

                if (textLenght <= 12) {
                    excesiveLength = false;

                } else {
                    final String uri = this.fileUtils.saveFile(file);

                    if (textLenght <= 18 && this.pdfGalValidator.allLandscape(uri)) {
                        excesiveLength = false;
                    }
                    this.fileUtils.delete(uri);
                }

            } else if (textLenght <= 21) {
                excesiveLength = false;
            }

            if (excesiveLength) {
                errors.rejectValue("text", "watermark.validator.passwords");
            }
        }
    }
}