com.trenako.web.images.validation.ImageValidator.java Source code

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Here is the source code for com.trenako.web.images.validation.ImageValidator.java

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/*
 * Copyright 2012 the original author or authors.
 * 
 * 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 com.trenako.web.images.validation;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

import org.springframework.http.MediaType;
import org.springframework.web.multipart.MultipartFile;

import com.trenako.AppGlobals;

/**
 * @author Carlo Micieli
 */
public class ImageValidator implements ConstraintValidator<Image, MultipartFile> {

    @Override
    public void initialize(Image constraintAnnotation) {
    }

    @Override
    public boolean isValid(MultipartFile file, ConstraintValidatorContext context) {
        // skip validation for empty files.
        if (file == null || file.isEmpty())
            return true;

        // validate file size
        if (file.getSize() > AppGlobals.MAX_UPLOAD_SIZE) {
            return false;
        }

        // validate content type
        MediaType contentType = MediaType.parseMediaType(file.getContentType());
        if (!AppGlobals.ALLOWED_MEDIA_TYPES.contains(contentType.toString())) {
            return false;
        }

        return true;
    }
}