[#35] 로그인한 유저 인증 기능 추가

src/main/java/com/srltas/runtogether/adapter/in/web/filter/AuthenticationFilter.java

@@ -1,5 +1,6 @@
 package com.srltas.runtogether.adapter.in.web.filter;
 
+import static com.srltas.runtogether.common.AuthConstants.*;
 import static com.srltas.runtogether.common.SessionAttribute.*;
 
 import java.io.IOException;
@@ -29,7 +30,7 @@ public void doFilter(ServletRequest servletRequest, ServletResponse servletRespo
 		HttpServletRequest request = (HttpServletRequest)servletRequest;
 		HttpServletResponse response = (HttpServletResponse)servletResponse;
 
-		String authorizationHeader = request.getHeader("Authorization");
+		String authorizationHeader = request.getHeader(AUTHORIZATION);
 		String token = extractToken(authorizationHeader);
 
 		if (token != null) {
@@ -43,8 +44,8 @@ public void doFilter(ServletRequest servletRequest, ServletResponse servletRespo
 	}
 
 	private String extractToken(String authorizationHeader) {
-		if (authorizationHeader != null && authorizationHeader.startsWith("Bearer ")) {
-			return authorizationHeader.substring(7);
+		if (authorizationHeader != null && authorizationHeader.startsWith(BEARER_TOKEN_PREFIX)) {
+			return authorizationHeader.substring(BEARER_TOKEN_LENGTH);
 		}
 		return null;
 	}

src/main/java/com/srltas/runtogether/common/AuthConstants.java

@@ -0,0 +1,12 @@
+package com.srltas.runtogether.common;
+
+import static lombok.AccessLevel.PRIVATE;
+
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = PRIVATE)
+public final class AuthConstants {
+	public static final String AUTHORIZATION = "Authorization";
+	public static final String BEARER_TOKEN_PREFIX = "Bearer ";
+	public static final int BEARER_TOKEN_LENGTH = 7;
+}