Class JWTDecoder

lib/src/main/java/com/auth0/jwt/JWTDecoder.java:23–156

The JWTDecoder class holds the decode method to parse a given JWT token into it's JWT representation. This class is thread-safe.

 * This class is thread-safe.
 */
@SuppressWarnings("WeakerAccess")
final class JWTDecoder implements DecodedJWT, Serializable {

    private static final long serialVersionUID = 1873362438023312895L;

    private final String[] parts;
    private final Header header;
    private final Payload payload;

    JWTDecoder(String jwt) throws JWTDecodeException {
        this(new JWTParser(), jwt);
    }

    JWTDecoder(JWTParser converter, String jwt) throws JWTDecodeException {
        parts = TokenUtils.splitToken(jwt);
        String headerJson;
        String payloadJson;
        try {
            headerJson = new String(Base64.getUrlDecoder().decode(parts[0]), StandardCharsets.UTF_8);
            payloadJson = new String(Base64.getUrlDecoder().decode(parts[1]), StandardCharsets.UTF_8);
        } catch (NullPointerException e) {
            throw new JWTDecodeException("The UTF-8 Charset isn't initialized.", e);
        } catch (IllegalArgumentException e) {
            throw new JWTDecodeException("The input is not a valid base 64 encoded string.", e);
        }
        header = converter.parseHeader(headerJson);
        payload = converter.parsePayload(payloadJson);
    }

    @Override
    public String getAlgorithm() {
        return header.getAlgorithm();
    }

    @Override
    public String getType() {
        return header.getType();
    }

    @Override
    public String getContentType() {
        return header.getContentType();
    }

    @Override
    public String getKeyId() {
        return header.getKeyId();
    }

    @Override
    public Claim getHeaderClaim(String name) {
        return header.getHeaderClaim(name);
    }

    @Override
    public String getIssuer() {
        return payload.getIssuer();
    }