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1 files changed, 125 insertions, 0 deletions

diff --git a/pse-server/src/main/java/org/psesquared/server/config/ApplicationConfig.java b/pse-server/src/main/java/org/psesquared/server/config/ApplicationConfig.java
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+package org.psesquared.server.config;
+
+import lombok.RequiredArgsConstructor;
+import org.psesquared.server.authentication.api.data.access.AuthenticationDao;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.lang.NonNull;
+import org.springframework.scheduling.annotation.EnableAsync;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.AuthenticationProvider;
+import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
+import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+/**
+ * The application configuration class declaring several beans.
+ */
+@Configuration
+@EnableScheduling
+@EnableTransactionManagement
+@EnableAsync
+@RequiredArgsConstructor
+public class ApplicationConfig implements WebMvcConfigurer {
+
+  /**
+   * The message passed on to {@link UsernameNotFoundException}.
+   */
+  private static final String USERNAME_NOT_FOUND
+      = "No user with the given username was found.";
+
+  /**
+   * The JPA repository that handles user related database requests.
+   */
+  private final AuthenticationDao authenticationDao;
+
+  /**
+   * Returns a {@link UserDetailsService} bean for retrieving users via username
+   * from the database.
+   *
+   * @return {@link UserDetailsService}
+   */
+  @Bean
+  public UserDetailsService userDetailsService() {
+    return username -> authenticationDao.findByUsername(username)
+        .orElseThrow(() -> new UsernameNotFoundException(USERNAME_NOT_FOUND));
+  }
+
+  /**
+   * Returns an {@link AuthenticationProvider} bean for authenticating
+   * {@link org.springframework.security.core.userdetails.User}s with username
+   * and password using {@link #userDetailsService()} and
+   * {@link #passwordEncoder()}.
+   *
+   * @return {@link AuthenticationProvider}
+   */
+  @Bean
+  public AuthenticationProvider authenticationProvider() {
+    DaoAuthenticationProvider authProvider = new DaoAuthenticationProvider();
+    authProvider.setUserDetailsService(userDetailsService());
+    authProvider.setPasswordEncoder(passwordEncoder());
+    return authProvider;
+  }
+
+  /**
+   * Returns a {@link BCryptPasswordEncoder} bean for password encryption.
+   *
+   * @return {@link PasswordEncoder}
+   */
+  @Bean
+  public PasswordEncoder passwordEncoder() {
+    return new BCryptPasswordEncoder();
+  }
+
+  /**
+   * Returns an {@link AuthenticationManager} bean for processing authentication
+   * requests from the given {@link AuthenticationConfiguration}.
+   *
+   * @param config The application's authentication configuration
+   * @return {@link AuthenticationManager}
+   * @throws Exception When the authentication manager couldn't be retrieved
+   *        from the given configuration
+   */
+  @Bean
+  public AuthenticationManager authenticationManager(
+      final AuthenticationConfiguration config) throws Exception {
+    return config.getAuthenticationManager();
+  }
+
+  /**
+   * Returns a {@link WebMvcConfigurer} bean with CORS enabled globally.
+   *
+   * @return {@link WebMvcConfigurer}
+   */
+  @Bean
+  public WebMvcConfigurer corsConfigurer() {
+    return new WebMvcConfigurer() {
+      @Override
+      public void addCorsMappings(@NonNull final CorsRegistry registry) {
+        registry
+            .addMapping("/**")
+            .allowedOrigins("*")
+            .allowedMethods("*");
+      }
+    };
+  }
+
+  /**
+   * Registers an {@link AuthenticationValidatorInterceptor}.
+   *
+   * @param registry The {@link InterceptorRegistry}
+   */
+  @Override
+  public void addInterceptors(final InterceptorRegistry registry) {
+    registry.addInterceptor(new AuthenticationValidatorInterceptor());
+  }
+
+}