[feat] : 인증 인가 필터 작성 및 시큐리티, 웹 의존성 제거

build.gradle

@@ -34,13 +34,10 @@ dependencies {
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'io.projectreactor:reactor-test'
 
-    implementation 'org.springframework.boot:spring-boot-starter-security'
-
     implementation group: 'io.jsonwebtoken', name: 'jjwt-api', version: '0.11.2'
     runtimeOnly group: 'io.jsonwebtoken', name: 'jjwt-impl', version: '0.11.2'
     runtimeOnly group: 'io.jsonwebtoken', name: 'jjwt-jackson', version: '0.11.2'
 
-    implementation 'org.springframework.boot:spring-boot-starter-web'
 }
 
 dependencyManagement {

src/main/java/com/example/farmusgateway/filter/JwtAuthenticationGatewayFilterFactory.java

@@ -0,0 +1,142 @@
+package com.example.farmusgateway.filter;
+
+
+import io.jsonwebtoken.ExpiredJwtException;
+import io.jsonwebtoken.JwtException;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.MalformedJwtException;
+import lombok.Data;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.cloud.gateway.filter.GatewayFilter;
+import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+@Component
+@Slf4j
+public class JwtAuthenticationGatewayFilterFactory extends AbstractGatewayFilterFactory<JwtAuthenticationGatewayFilterFactory.Config> {
+
+    @Value("${jwt.secret}")
+    private String secret;
+
+    public JwtAuthenticationGatewayFilterFactory() {
+        super(Config.class);
+
+    }
+
+    // login -> token -> users (with token) -> header(include token)
+    @Override
+    public GatewayFilter apply(Config config) {
+        return (exchange, chain) -> {
+            ServerHttpRequest request = exchange.getRequest();
+
+            String authorizationHeader = request.getHeaders().get(HttpHeaders.AUTHORIZATION).get(0);
+            log.info("authorizationHeader : {}", authorizationHeader);
+            String jwt = authorizationHeader.replace("Bearer ", "");
+            log.info("jwt : {}", jwt);
+
+            String subject = decode(jwt);
+            request.mutate()
+                    .header("user", subject)
+                    .build();
+
+            log.info("request.getURI().toString() : {}", request.getURI().toString());
+
+            // get url after endpoint
+            int index = request.getURI().toString().indexOf("/api");
+            String url = request.getURI().toString().substring(index);
+
+            log.info("url : {}", url);
+
+            if(url.equals("/api/user/reissue-token")) {
+                return chain.filter(exchange);
+            }
+
+            if(!request.getHeaders().containsKey(HttpHeaders.AUTHORIZATION)) {
+                return onError(exchange, "no authorization header", HttpStatus.UNAUTHORIZED);
+            }
+
+            if(!isJwtValid(jwt, exchange)) {
+                return onError(exchange, "JWT token is not valid", HttpStatus.UNAUTHORIZED);
+            }
+
+            // 헤더 출력
+            request.getHeaders().forEach((k, v) -> {
+                log.info("{} : {}", k, v);
+            });
+
+            // Custom Post Filter
+            return chain.filter(exchange);
+        };
+    }
+
+    private boolean isJwtValid(String jwt, ServerWebExchange exchange) {
+        boolean returnValue = true;
+
+        try {
+            String subject = Jwts.parserBuilder().setSigningKey(secret).build()
+                    .parseClaimsJws(jwt).getBody()
+                    .getSubject();
+
+            log.info("subject : {}", subject);
+
+            if (subject == null || subject.isEmpty()) {
+                returnValue = false;
+                onError(exchange, "JWT token is not valid", HttpStatus.UNAUTHORIZED);
+            }
+        } catch (IllegalArgumentException e) {
+            returnValue = false;
+            onError(exchange, "Invalid access token header", HttpStatus.BAD_REQUEST);
+        } catch (io.jsonwebtoken.security.SecurityException | MalformedJwtException e) {
+            returnValue = false;
+            onError(exchange, "Verification error", HttpStatus.UNAUTHORIZED);
+        } catch (ExpiredJwtException e) {
+            returnValue = false;
+            onError(exchange, "Token expired", HttpStatus.PRECONDITION_FAILED);
+        } catch (JwtException e) {
+            returnValue = false;
+            onError(exchange, "JWT error", HttpStatus.UNAUTHORIZED);
+        }
+
+        return returnValue;
+    }
+
+    public String decode(String token) {
+
+        String subject = null;
+        try {
+            subject = Jwts.parser().setSigningKey(secret)
+                    .parseClaimsJws(token).getBody()
+                    .getSubject();
+        } catch(Exception ex) {
+            onError(null, "JWT error", HttpStatus.UNAUTHORIZED);
+        }
+
+        if(subject == null || subject.isEmpty()) {
+            onError(null, "JWT error", HttpStatus.UNAUTHORIZED);
+        }
+
+        return subject;
+    }
+
+    // Mono, Flux -> Spring WebFlux
+    private Mono<Void> onError(ServerWebExchange exchange, String error, HttpStatus httpStatus) {
+        ServerHttpResponse response = exchange.getResponse();
+        response.setStatusCode(httpStatus);
+
+        log.error(error);
+
+        return response.setComplete();
+    }
+
+    @Data
+    public static class Config {
+
+    }
+}