DefaultTokenVerifier.java

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package dev.rafex.ether.jwt;
 
/*-
 * #%L
 * ether-jwt
 * %%
 * Copyright (C) 2025 - 2026 Raúl Eduardo González Argote
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */
 
import dev.rafex.ether.jwt.internal.ClaimsMapper;
import dev.rafex.ether.jwt.internal.JwtCodec;
import dev.rafex.ether.jwt.internal.JwtSigner;
import dev.rafex.ether.jwt.internal.TokenValidator;
 
import java.time.Instant;
import java.util.Objects;
 
/** Default implementation of {@link TokenVerifier}. */
public final class DefaultTokenVerifier implements TokenVerifier {
 
    private final JwtConfig config;
 
    public DefaultTokenVerifier(final JwtConfig config) {
        this.config = Objects.requireNonNull(config, "config");
        validateVerifierConfig(config);
    }
 
    @Override
    public VerificationResult verify(final String token, final Instant now) {
        try {
            final JwtCodec.ParsedJwt parsed = JwtCodec.parse(token);
            final JwtAlgorithm tokenAlg = JwtAlgorithm.fromHeaderValue(parsed.header().path("alg").asText(null));
            if (tokenAlg == null || tokenAlg != config.keyProvider().algorithm()) {
                return VerificationResult.fail(VerificationCode.UNSUPPORTED_ALG);
            }
 
            if (!JwtSigner.verify(parsed.signingInput(), parsed.encodedSignature(), config)) {
                return VerificationResult.fail(VerificationCode.BAD_SIGNATURE);
            }
 
            final String tokenTypeRaw = ClaimsMapper.tokenTypeRaw(parsed.payload());
            final TokenClaims claims = ClaimsMapper.fromPayload(parsed.payload());
            final VerificationCode validationResult = TokenValidator.validate(claims, parsed.payload(), config,
                    now == null ? Instant.now() : now, tokenTypeRaw);
 
            if (validationResult != VerificationCode.OK) {
                return VerificationResult.fail(validationResult);
            }
            return VerificationResult.ok(claims);
        } catch (final IllegalArgumentException e) {
            return VerificationResult.fail(VerificationCode.BAD_FORMAT);
        } catch (final Exception e) {
            return VerificationResult.fail(VerificationCode.VERIFY_EXCEPTION);
        }
    }
 
    private static void validateVerifierConfig(final JwtConfig config) {
        if (config.keyProvider().algorithm() == JwtAlgorithm.HS256 && config.keyProvider().hmacSecret() == null) {
            throw new IllegalArgumentException("HS256 requires explicit hmac secret");
        }
        if (config.keyProvider().algorithm() == JwtAlgorithm.RS256 && config.keyProvider().publicKey() == null) {
            throw new IllegalArgumentException("RS256 requires public key for verification");
        }
    }
}