Package com.example.blogs.app.api.auth.service

Class JWTHelperImpl

java.lang.Object

com.example.blogs.app.api.auth.service.JWTHelperImpl

All Implemented Interfaces:

JWTHelper

@Component
public class JWTHelperImpl
extends Object
implements JWTHelper

Generates JWT tokens using JJWT library with HMAC SHA256 signing.

Constructor Summary

Constructors

Constructor	Description
JWTHelperImpl(String secretKey, io.jsonwebtoken.JwtParser jwtParser)	Constructs a JWTHelperImpl with the configured secret key.

Method Summary

Modifier and Type	Method	Description
String	generateToken(String subject, Duration expiration)	Generates a JWT token with no additional claims.
String	generateToken(String subject, Map<String,Object> claims, Duration expiration)	Generates a JWT token with custom claims and expiration.
Map<String,Object>	parseClaims(String token)	Parses and extracts claims from a JWT token.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

JWTHelperImpl

public JWTHelperImpl(@Value("${jwt.secret-key}")
 String secretKey,
 io.jsonwebtoken.JwtParser jwtParser)

Constructs a JWTHelperImpl with the configured secret key.

Parameters:

secretKey - the secret key used for signing tokens, loaded from application properties

jwtParser - the JWT parser for validating and parsing tokens

Method Details

generateToken

public String generateToken(String subject,
 Duration expiration)

Generates a JWT token with no additional claims.

Specified by:

generateToken in interface JWTHelper

Parameters:

subject - the token subject (typically user ID)

expiration - time until expiration

Returns:

signed JWT token string

generateToken

public String generateToken(String subject,
 Map<String,Object> claims,
 Duration expiration)

Generates a JWT token with custom claims and expiration.

Specified by:

generateToken in interface JWTHelper

Parameters:

subject - the token subject (typically user ID)

claims - additional JWT claims to include in payload

expiration - time until expiration

Returns:

signed JWT token string

parseClaims

public Map<String,Object> parseClaims(String token)

Parses and extracts claims from a JWT token.

Specified by:

parseClaims in interface JWTHelper

Parameters:

token - the JWT token to parse

Returns:

map of claims from the token payload

Throws:

FailedToParseClaimsException - if token is malformed or signature is invalid