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@GetMapping("/titulaciones")
public ResponseEntity<List<TitulacionDTO>> titulaciones(@RequestHeader(value="auth-tokenAuthorization", required = true) String tokenCodificado) {
	// Comprobamos el token
	try {
		jwtTokenUtil.getClaim( tokenCodificado );
	} catch( final ServicioException e ) {
		log.error( e.getLocalizedMessage() );
		return new ResponseEntity<>( HttpStatus.FORBIDDEN );
	}
}

@Log4j2
@Component
public class JwtTokenUtil {

	@Value( "${es.um.jwt.secret}" )
	private String secret;

	// In minutes
	@Value( "${es.um.jwt.expires}" )
	private long expires;

	/**
	 * Get the claim from the token If token expirated throw TokenExpiredException If token is invalid throw
	 * UnauthorizedException
	 */
	public Claims getClaim( String token ) {
		final String[] tokenSplits = token.split( " " );
		if ( !tokenSplits[0].equals( "Bearer" ) ) {
			throw new UnauthorizedException();
		} else {
			token = tokenSplits[1];
			try {
				final Claims claims = Jwts.parser().setSigningKey( TextCodec.BASE64.encode( secret ) )
						.parseClaimsJws( token ).getBody();
				log.debug( "El claims es: " + claims.toString() );
				log.debug( "El subject es: " + claims.getSubject() );

				final Date expiration = claims.getExpiration();
				if ( Instant.now().isAfter( expiration.toInstant() ) ) {
					log.error( "Expiration Date: " + expiration.toString() );
					log.error( "Current Instant: " + Instant.now().toString() );
					log.error( "Error el token " + token + " está caducado" );
					throw new TokenExpiredException();
				}

				return claims;

			} catch ( final JwtException e ) {
				log.error( "Error filtering:" + e );
				throw new UnauthorizedException();
			}
		}
	}
}