Added Signup and JWT Login

2025-04-14 22:27:39 +05:30
parent 72bfd2eb0c
commit 3bc5cf3e62
14 changed files with 662 additions and 18 deletions
@@ -0,0 +1,83 @@
+package com.skycrate.backend.skycrateBackend.services;
+
+import java.security.Key;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Function;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.stereotype.Service;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+import io.jsonwebtoken.io.Decoders;
+import io.jsonwebtoken.security.Keys;
+
+@Service
+public class JwtService {
+    @Value("${security.jwt.secret-key}")
+    private String secretKey;
+    
+    @Value("${security.jwt.expiration-time}")
+    private long jwtExpiration;
+
+    public String extractUsername(String token){
+        return extractClaim(token,Claims::getSubject);
+    }
+
+    public <T> T extractClaim(String token,Function<Claims,T> claimsResolver){
+        final Claims claims=extractAllClaims(token);
+        return claimsResolver.apply(claims);
+
+    }
+
+    public String generateToken(UserDetails userDetails) {
+        return generateToken(new HashMap<>(), userDetails);
+    }
+
+    public String generateToken(Map<String, Object> extraClaims, UserDetails userDetails) {
+        return buildToken(extraClaims, userDetails, jwtExpiration);
+    }
+
+    public long getExpirtationTime(){
+        return jwtExpiration;
+    }
+    private String buildToken(Map<String,Object> extraClaims,UserDetails userDetails,long expiration){
+
+        return  Jwts.builder().setClaims(extraClaims).setSubject(userDetails.getUsername())
+                    .setIssuedAt(new Date(System.currentTimeMillis()))
+                    .setExpiration(new Date(System.currentTimeMillis() + expiration))
+                    .signWith(getSignInKey(), SignatureAlgorithm.HS256)
+                    .compact();
+    }
+    
+    public boolean isTokenValid(String token, UserDetails userDetails) {
+        final String username = extractUsername(token);
+        return (username.equals(userDetails.getUsername())) && !isTokenExpired(token);
+    }
+
+    private boolean isTokenExpired(String token) {
+        return extractExpiration(token).before(new Date());
+    }
+
+    private Date extractExpiration(String token) {
+        return extractClaim(token, Claims::getExpiration);
+    }
+
+    private Claims extractAllClaims(String token) {
+        return Jwts
+                .parserBuilder()
+                .setSigningKey(getSignInKey())
+                .build()
+                .parseClaimsJws(token)
+                .getBody();
+    }
+
+    private Key getSignInKey() {
+        byte[] keyBytes = Decoders.BASE64.decode(secretKey);
+        return Keys.hmacShaKeyFor(keyBytes);
+    }
+}