feat: JwtProvider - AccessToken 발급 method (#7)

build.gradle

@@ -35,6 +35,11 @@ dependencies {
 
 	// oauth
 	implementation 'org.springframework.boot:spring-boot-starter-oauth2-client'
+
+	// jwt
+	implementation 'io.jsonwebtoken:jjwt-api:0.11.5'
+	runtimeOnly 'io.jsonwebtoken:jjwt-impl:0.11.5'
+	runtimeOnly 'io.jsonwebtoken:jjwt-jackson:0.11.5'
 }
 
 tasks.named('bootBuildImage') {

src/main/java/com/api/TaveShot/global/constant/OauthConstant.java

@@ -11,5 +11,6 @@ private OauthConstant() {
     public static final String LOGIN_PATTERN = "login";
     public static final String NAME_PATTERN = "name";
     public static final String EMAIL_PATTERN = "email";
+    public static final long ACCESS_TOKEN_VALID_TIME = 15 * 60 * 1000L;
 
 }

src/main/java/com/api/TaveShot/global/jwt/JwtProvider.java

@@ -0,0 +1,45 @@
+package com.api.TaveShot.global.jwt;
+
+import static com.api.TaveShot.global.constant.OauthConstant.ACCESS_TOKEN_VALID_TIME;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+import io.jsonwebtoken.security.Keys;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+import javax.crypto.SecretKey;
+import org.springframework.beans.factory.annotation.Value;
+
+public class JwtProvider {
+
+    @Value("${jwt.secret.key}")
+    private String SECRET_KEY;
+
+    public String generateAccessToken(String id) {
+        Claims claims = createClaims(id);
+        Date now = new Date();
+        long expiredDate = calculateExpirationDate(now);
+        SecretKey secretKey = generateKey();
+
+        return Jwts.builder()
+                .setClaims(claims)
+                .setIssuedAt(now)
+                .setExpiration(new Date(expiredDate))
+                .signWith(secretKey, SignatureAlgorithm.HS256)
+                .compact();
+    }
+
+    private Claims createClaims(String id) {
+        return Jwts.claims().setSubject(id);
+    }
+
+    private long calculateExpirationDate(Date now) {
+        return now.getTime() + ACCESS_TOKEN_VALID_TIME;
+    }
+
+    private SecretKey generateKey() {
+        return Keys.hmacShaKeyFor(SECRET_KEY.getBytes(StandardCharsets.UTF_8));
+    }
+
+}