fix:#25 AuthenticationProvider 구현해서 로그인 처리

src/main/java/com/t3t/authenticationapi/account/component/CustomAuthenticationProvider.java

@@ -0,0 +1,50 @@
+package com.t3t.authenticationapi.account.component;
+
+import com.t3t.authenticationapi.account.auth.CustomUserDetails;
+import com.t3t.authenticationapi.account.dto.UserEntity;
+import com.t3t.authenticationapi.account.service.DefaultUserDetailsService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.security.authentication.AuthenticationProvider;
+import org.springframework.security.authentication.BadCredentialsException;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Controller;
+
+
+@Configuration
+@RequiredArgsConstructor
+public class CustomAuthenticationProvider implements AuthenticationProvider {
+    private final DefaultUserDetailsService userDetailsService;
+
+    @Bean
+    public BCryptPasswordEncoder bCryptPasswordEncoder(){
+        return new BCryptPasswordEncoder();
+    }
+
+    @Override
+    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
+        String username = authentication.getName();
+        String password = authentication.getCredentials().toString();
+
+        CustomUserDetails userDetails = (CustomUserDetails) userDetailsService.loadUserByUsername(username);
+
+        String dbPassword = userDetails.getPassword();
+        if(!bCryptPasswordEncoder().matches(password,dbPassword)){
+            throw new BadCredentialsException("id, pw not match");
+        }
+
+        return new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
+    }
+
+    @Override
+    public boolean supports(Class<?> authentication) {
+        return authentication.equals(UsernamePasswordAuthenticationToken.class);
+    }
+
+}