ch.ge.ve.protopoc.jwt.JwtTokenUtil.java Source code

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Here is the source code for ch.ge.ve.protopoc.jwt.JwtTokenUtil.java

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/*-------------------------------------------------------------------------------------------------
 - #%L                                                                                            -
 - chvote-protocol-poc                                                                            -
 - %%                                                                                             -
 - Copyright (C) 2016 - 2017 Rpublique et Canton de Genve                                       -
 - %%                                                                                             -
 - This program 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 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/>.                           -
 - #L%                                                                                            -
 -------------------------------------------------------------------------------------------------*/

package ch.ge.ve.protopoc.jwt;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;

import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@Component
public class JwtTokenUtil implements Serializable {

    private static final String CLAIM_KEY_USERNAME = "sub";
    private static final String CLAIM_KEY_AUDIENCE = "audience";
    private static final String CLAIM_KEY_CREATED = "created";
    private static final long serialVersionUID = -3301605591108950415L;
    @Value("${jwt.secret}")
    private String secret;

    @Value("${jwt.expiration}")
    private Long expiration;

    public String getUsernameFromToken(String token) {
        String username;
        try {
            final Claims claims = getClaimsFromToken(token);
            username = claims.getSubject();
        } catch (Exception e) {
            username = null;
        }
        return username;
    }

    public Date getCreatedDateFromToken(String token) {
        Date created;
        try {
            final Claims claims = getClaimsFromToken(token);
            created = new Date((Long) claims.get(CLAIM_KEY_CREATED));
        } catch (Exception e) {
            created = null;
        }
        return created;
    }

    public Date getExpirationDateFromToken(String token) {
        Date expiration;
        try {
            final Claims claims = getClaimsFromToken(token);
            expiration = claims.getExpiration();
        } catch (Exception e) {
            expiration = null;
        }
        return expiration;
    }

    public String getAudienceFromToken(String token) {
        String audience;
        try {
            final Claims claims = getClaimsFromToken(token);
            audience = (String) claims.get(CLAIM_KEY_AUDIENCE);
        } catch (Exception e) {
            audience = null;
        }
        return audience;
    }

    private Claims getClaimsFromToken(String token) {
        Claims claims;
        try {
            claims = Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
        } catch (Exception e) {
            claims = null;
        }
        return claims;
    }

    private Date generateExpirationDate() {
        return new Date(System.currentTimeMillis() + expiration * 1000);
    }

    private Boolean isTokenExpired(String token) {
        final Date expiration = getExpirationDateFromToken(token);
        return expiration.before(new Date());
    }

    private Boolean isCreatedBeforeLastPasswordReset(Date created, Date lastPasswordReset) {
        return (lastPasswordReset != null && created.before(lastPasswordReset));
    }

    public String generateToken(UserDetails userDetails) {
        Map<String, Object> claims = new HashMap<>();
        claims.put(CLAIM_KEY_USERNAME, userDetails.getUsername());
        claims.put(CLAIM_KEY_CREATED, new Date());
        return generateToken(claims);
    }

    String generateToken(Map<String, Object> claims) {
        return Jwts.builder().setClaims(claims).setExpiration(generateExpirationDate())
                .signWith(SignatureAlgorithm.HS512, secret).compact();
    }

    public Boolean canTokenBeRefreshed(String token) {
        return !isTokenExpired(token);
    }

    public String refreshToken(String token) {
        String refreshedToken;
        try {
            final Claims claims = getClaimsFromToken(token);
            claims.put(CLAIM_KEY_CREATED, new Date());
            refreshedToken = generateToken(claims);
        } catch (Exception e) {
            refreshedToken = null;
        }
        return refreshedToken;
    }

    public Boolean validateToken(String token, UserDetails userDetails) {
        JwtUser user = (JwtUser) userDetails;
        final String username = getUsernameFromToken(token);
        return (username.equals(user.getUsername()) && !isTokenExpired(token));
    }
}