use of io.jsonwebtoken.CompressionCodec in project jjwt by jwtk.
the class DefaultJwtParser method parse.
@Override
public Jwt parse(String jwt) throws ExpiredJwtException, MalformedJwtException, SignatureException {
Assert.hasText(jwt, "JWT String argument cannot be null or empty.");
String base64UrlEncodedHeader = null;
String base64UrlEncodedPayload = null;
String base64UrlEncodedDigest = null;
int delimiterCount = 0;
StringBuilder sb = new StringBuilder(128);
for (char c : jwt.toCharArray()) {
if (c == SEPARATOR_CHAR) {
CharSequence tokenSeq = Strings.clean(sb);
String token = tokenSeq != null ? tokenSeq.toString() : null;
if (delimiterCount == 0) {
base64UrlEncodedHeader = token;
} else if (delimiterCount == 1) {
base64UrlEncodedPayload = token;
}
delimiterCount++;
sb.setLength(0);
} else {
sb.append(c);
}
}
if (delimiterCount != 2) {
String msg = "JWT strings must contain exactly 2 period characters. Found: " + delimiterCount;
throw new MalformedJwtException(msg);
}
if (sb.length() > 0) {
base64UrlEncodedDigest = sb.toString();
}
if (base64UrlEncodedPayload == null) {
throw new MalformedJwtException("JWT string '" + jwt + "' is missing a body/payload.");
}
// =============== Header =================
Header header = null;
CompressionCodec compressionCodec = null;
if (base64UrlEncodedHeader != null) {
String origValue = TextCodec.BASE64URL.decodeToString(base64UrlEncodedHeader);
Map<String, Object> m = readValue(origValue);
if (base64UrlEncodedDigest != null) {
header = new DefaultJwsHeader(m);
} else {
header = new DefaultHeader(m);
}
compressionCodec = compressionCodecResolver.resolveCompressionCodec(header);
}
// =============== Body =================
String payload;
if (compressionCodec != null) {
byte[] decompressed = compressionCodec.decompress(TextCodec.BASE64URL.decode(base64UrlEncodedPayload));
payload = new String(decompressed, Strings.UTF_8);
} else {
payload = TextCodec.BASE64URL.decodeToString(base64UrlEncodedPayload);
}
Claims claims = null;
if (payload.charAt(0) == '{' && payload.charAt(payload.length() - 1) == '}') {
//likely to be json, parse it:
Map<String, Object> claimsMap = readValue(payload);
claims = new DefaultClaims(claimsMap);
}
// =============== Signature =================
if (base64UrlEncodedDigest != null) {
//it is signed - validate the signature
JwsHeader jwsHeader = (JwsHeader) header;
SignatureAlgorithm algorithm = null;
if (header != null) {
String alg = jwsHeader.getAlgorithm();
if (Strings.hasText(alg)) {
algorithm = SignatureAlgorithm.forName(alg);
}
}
if (algorithm == null || algorithm == SignatureAlgorithm.NONE) {
//it is plaintext, but it has a signature. This is invalid:
String msg = "JWT string has a digest/signature, but the header does not reference a valid signature " + "algorithm.";
throw new MalformedJwtException(msg);
}
if (key != null && keyBytes != null) {
throw new IllegalStateException("A key object and key bytes cannot both be specified. Choose either.");
} else if ((key != null || keyBytes != null) && signingKeyResolver != null) {
String object = key != null ? "a key object" : "key bytes";
throw new IllegalStateException("A signing key resolver and " + object + " cannot both be specified. Choose either.");
}
//digitally signed, let's assert the signature:
Key key = this.key;
if (key == null) {
//fall back to keyBytes
byte[] keyBytes = this.keyBytes;
if (Objects.isEmpty(keyBytes) && signingKeyResolver != null) {
//use the signingKeyResolver
if (claims != null) {
key = signingKeyResolver.resolveSigningKey(jwsHeader, claims);
} else {
key = signingKeyResolver.resolveSigningKey(jwsHeader, payload);
}
}
if (!Objects.isEmpty(keyBytes)) {
Assert.isTrue(algorithm.isHmac(), "Key bytes can only be specified for HMAC signatures. Please specify a PublicKey or PrivateKey instance.");
key = new SecretKeySpec(keyBytes, algorithm.getJcaName());
}
}
Assert.notNull(key, "A signing key must be specified if the specified JWT is digitally signed.");
//re-create the jwt part without the signature. This is what needs to be signed for verification:
String jwtWithoutSignature = base64UrlEncodedHeader + SEPARATOR_CHAR + base64UrlEncodedPayload;
JwtSignatureValidator validator;
try {
validator = createSignatureValidator(algorithm, key);
} catch (IllegalArgumentException e) {
String algName = algorithm.getValue();
String msg = "The parsed JWT indicates it was signed with the " + algName + " signature " + "algorithm, but the specified signing key of type " + key.getClass().getName() + " may not be used to validate " + algName + " signatures. Because the specified " + "signing key reflects a specific and expected algorithm, and the JWT does not reflect " + "this algorithm, it is likely that the JWT was not expected and therefore should not be " + "trusted. Another possibility is that the parser was configured with the incorrect " + "signing key, but this cannot be assumed for security reasons.";
throw new UnsupportedJwtException(msg, e);
}
if (!validator.isValid(jwtWithoutSignature, base64UrlEncodedDigest)) {
String msg = "JWT signature does not match locally computed signature. JWT validity cannot be " + "asserted and should not be trusted.";
throw new SignatureException(msg);
}
}
final boolean allowSkew = this.allowedClockSkewMillis > 0;
//since 0.3:
if (claims != null) {
SimpleDateFormat sdf;
final Date now = this.clock.now();
long nowTime = now.getTime();
//https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-30#section-4.1.4
//token MUST NOT be accepted on or after any specified exp time:
Date exp = claims.getExpiration();
if (exp != null) {
long maxTime = nowTime - this.allowedClockSkewMillis;
Date max = allowSkew ? new Date(maxTime) : now;
if (max.after(exp)) {
sdf = new SimpleDateFormat(ISO_8601_FORMAT);
String expVal = sdf.format(exp);
String nowVal = sdf.format(now);
long differenceMillis = maxTime - exp.getTime();
String msg = "JWT expired at " + expVal + ". Current time: " + nowVal + ", a difference of " + differenceMillis + " milliseconds. Allowed clock skew: " + this.allowedClockSkewMillis + " milliseconds.";
throw new ExpiredJwtException(header, claims, msg);
}
}
//https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-30#section-4.1.5
//token MUST NOT be accepted before any specified nbf time:
Date nbf = claims.getNotBefore();
if (nbf != null) {
long minTime = nowTime + this.allowedClockSkewMillis;
Date min = allowSkew ? new Date(minTime) : now;
if (min.before(nbf)) {
sdf = new SimpleDateFormat(ISO_8601_FORMAT);
String nbfVal = sdf.format(nbf);
String nowVal = sdf.format(now);
long differenceMillis = nbf.getTime() - minTime;
String msg = "JWT must not be accepted before " + nbfVal + ". Current time: " + nowVal + ", a difference of " + differenceMillis + " milliseconds. Allowed clock skew: " + this.allowedClockSkewMillis + " milliseconds.";
throw new PrematureJwtException(header, claims, msg);
}
}
validateExpectedClaims(header, claims);
}
Object body = claims != null ? claims : payload;
if (base64UrlEncodedDigest != null) {
return new DefaultJws<Object>((JwsHeader) header, body, base64UrlEncodedDigest);
} else {
return new DefaultJwt<Object>(header, body);
}
}
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