com.dhenton9000.filedownloader.CheckFileHash.java Source code

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Here is the source code for com.dhenton9000.filedownloader.CheckFileHash.java

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/*
 * Copyright (c) 2010-2012 Lazery Attack - http://www.lazeryattack.com
 *
 * 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.dhenton9000.filedownloader;

import org.apache.commons.codec.digest.DigestUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CheckFileHash {

    private static final Logger LOG = LoggerFactory.getLogger(CheckFileHash.class);

    public static String getFileHash(File fileToCheck, TypeOfHash typeOfHash)
            throws FileNotFoundException, IOException {

        String actualFileHash = null;
        switch (typeOfHash) {
        case MD5:
            actualFileHash = DigestUtils.md5Hex(new FileInputStream(fileToCheck));

            break;
        case SHA1:
            actualFileHash = DigestUtils.shaHex(new FileInputStream(fileToCheck));

            break;
        }

        return actualFileHash;

    }

    private final TypeOfHash typeOfHash;
    private final String expectedFileHash;
    private final File fileToCheck;

    public CheckFileHash(File fileToCheck, String expectedFileHash, TypeOfHash typeOfHash) {
        this.fileToCheck = fileToCheck;
        this.expectedFileHash = expectedFileHash;
        this.typeOfHash = typeOfHash;

    }

    /**
     * Performs a expectedFileHash check on a File.
     *
     * @return
     * @throws IOException
     */
    public boolean hasAValidHash() throws IOException {
        if (this.fileToCheck == null) {
            throw new FileNotFoundException("File to check has not been set!");
        }
        if (this.expectedFileHash == null || this.typeOfHash == null) {
            throw new NullPointerException("Hash details have not been set!");
        }
        if (!this.fileToCheck.exists()) {
            throw new FileNotFoundException("File '" + fileToCheck.getCanonicalPath() + "' not found");
        }

        String actualFileHash = "";
        boolean isHashValid = false;

        switch (this.typeOfHash) {
        case MD5:
            actualFileHash = DigestUtils.md5Hex(new FileInputStream(this.fileToCheck));
            if (this.expectedFileHash.equals(actualFileHash)) {
                isHashValid = true;
            }
            break;
        case SHA1:
            actualFileHash = DigestUtils.shaHex(new FileInputStream(this.fileToCheck));
            if (this.expectedFileHash.equals(actualFileHash)) {
                isHashValid = true;
            }
            break;
        }

        LOG.info("Filename = '" + this.fileToCheck.getName() + "'");
        LOG.info("Expected Hash = '" + this.expectedFileHash + "'");
        LOG.info("Actual Hash = '" + actualFileHash + "'");

        return isHashValid;
    }

}