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/*
 * Copyright (C) 2008-2020, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.juick.config;

import com.juick.SignatureManager;
import com.juick.service.UserService;
import com.juick.service.security.HTTPSignatureAuthenticationFilter;
import com.juick.service.security.HashParamAuthenticationFilter;
import com.juick.service.security.JuickUserDetailsService;
import com.juick.service.security.entities.JuickUser;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpMethod;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
import org.springframework.security.web.authentication.RememberMeServices;
import org.springframework.security.web.authentication.SimpleUrlAuthenticationSuccessHandler;
import org.springframework.security.web.authentication.rememberme.TokenBasedRememberMeServices;
import org.springframework.security.web.authentication.www.BasicAuthenticationEntryPoint;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

import java.util.Arrays;
import java.util.Collections;

import javax.inject.Inject;

/**
 * Created by aalexeev on 11/21/16.
 */
@EnableWebSecurity
@Configuration
public class SecurityConfig {
    @Inject
    private UserService userService;

    private static final String COOKIE_NAME = "juick-remember-me";

    @Bean
    UserDetailsService userDetailsService() {
        return new JuickUserDetailsService(userService);
    }

    @Bean
    static CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();

        configuration.setAllowedOrigins(Collections.singletonList("*"));
        configuration.setAllowedMethods(Arrays.asList("POST", "GET", "PUT", "OPTIONS", "DELETE"));
        configuration.setAllowedHeaders(Collections.singletonList("*"));

        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/api/**", configuration);
        source.registerCorsConfiguration("/u/**", configuration);
        source.registerCorsConfiguration("/n/**", configuration);
        return source;
    }

    @Inject
    private SignatureManager signatureManager;

    @Bean
    HashParamAuthenticationFilter apiAuthenticationFilter() {
        return new HashParamAuthenticationFilter(userService, null);
    }

    @Bean
    AuthenticationEntryPoint juickAuthenticationEntryPoint() {
        var entryPoint = new BasicAuthenticationEntryPoint();
        entryPoint.setRealmName("Juick");
        return entryPoint;
    }

    @Value("${auth_remember_me_key:secret}")
    private String rememberMeKey;
    @Value("${web_domain:localhost}")
    private String webDomain;

    @Bean
    HashParamAuthenticationFilter wwwAuthenticationFilter() {
        return new HashParamAuthenticationFilter(userService, hashCookieServices());
    }

    @Bean
    RememberMeServices hashCookieServices() {
        TokenBasedRememberMeServices services = new TokenBasedRememberMeServices(
                rememberMeKey, userDetailsService());

        services.setCookieName(COOKIE_NAME);
        services.setCookieDomain(webDomain);
        services.setAlwaysRemember(true);
        services.setTokenValiditySeconds(6 * 30 * 24 * 3600);
        services.setUseSecureCookie(false); // TODO set true if https is supports
        return services;
    }

    @Bean
    @Order(1)
    SecurityFilterChain apiChain(HttpSecurity http) throws Exception {
        http.securityMatcher("/api/**")
                .addFilterBefore(apiAuthenticationFilter(), BasicAuthenticationFilter.class)
                .addFilterBefore(new HTTPSignatureAuthenticationFilter(signatureManager, userService),
                        BasicAuthenticationFilter.class)
                .authorizeHttpRequests(requests -> requests
                        .requestMatchers(HttpMethod.OPTIONS).permitAll()
                        .requestMatchers("/api/", "/api/messages", "/api/avatar",
                                "/api/messages/discussions",
                                "/api/users", "/api/thread", "/api/tags",
                                "/api/tlgmbtwbhk", "/api/fbwbhk",
                                "/api/skypebotendpoint", "/api/_fblogin",
                                "/api/_vklogin", "/api/_tglogin",
                                "/api/_google", "/api/_applelogin", "/api/signup",
                                "/api/inbox", "/api/events",
                                "/api/info/**",
                                "/api/nodeinfo/2.0")
                        .permitAll()
                        .anyRequest().hasRole("USER"))
                .anonymous(anonymous -> anonymous.principal(JuickUser.ANONYMOUS_USER)
                        .authorities(JuickUser.ANONYMOUS_AUTHORITY))
                .httpBasic(httpBasic -> httpBasic
                        .authenticationEntryPoint(juickAuthenticationEntryPoint()))
                .cors(cors -> cors.configurationSource(corsConfigurationSource()))
                .sessionManagement(sessionManagement -> sessionManagement
                        .sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                .exceptionHandling(exceptionHandling -> exceptionHandling
                        .authenticationEntryPoint(juickAuthenticationEntryPoint()))
                .csrf().disable()
                .headers().defaultsDisabled().cacheControl();
        return http.build();
    }

    @Bean
    AuthenticationSuccessHandler successHandler() {
        SimpleUrlAuthenticationSuccessHandler handler = new SimpleUrlAuthenticationSuccessHandler();
        handler.setUseReferer(true);
        return handler;
    }

    @Bean
    SecurityFilterChain wwwChain(HttpSecurity http) throws Exception {
        http.addFilterBefore(wwwAuthenticationFilter(), BasicAuthenticationFilter.class)
                .authorizeHttpRequests(authorize -> authorize
                        .requestMatchers("/settings", "/pm/**", "/**/bl", "/_twitter", "/post",
                                "/post2",
                                "/comment")
                        .authenticated()
                        .requestMatchers("/actuator/**").hasRole("ADMIN")
                        .anyRequest().permitAll())
                .anonymous(anonymous -> anonymous.principal(JuickUser.ANONYMOUS_USER)
                        .authorities(JuickUser.ANONYMOUS_AUTHORITY))
                .cors(cors -> cors
                        .configurationSource(corsConfigurationSource()))
                .sessionManagement(
                        sessionManagement -> sessionManagement
                                .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                                .invalidSessionUrl("/"))
                .logout(logout -> logout
                        .logoutRequestMatcher(new AntPathRequestMatcher("/logout"))
                        .invalidateHttpSession(true)
                        .logoutSuccessUrl("/")
                        .deleteCookies("hash", COOKIE_NAME))
                .formLogin(form -> form.loginPage("/login")
                        .usernameParameter("username")
                        .passwordParameter("password")
                        .successHandler(successHandler())
                        .failureUrl("/login?error=1")
                        .permitAll())
                .csrf(csrf -> csrf.ignoringRequestMatchers("/settings/unsubscribe", "/h2-console/**"))
                .rememberMe(rememberMe -> rememberMe
                        .rememberMeCookieDomain(webDomain).key(rememberMeKey)
                        .rememberMeServices(hashCookieServices()))
                .headers().defaultsDisabled().cacheControl();
        return http.build();
    }
}