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/**

 * Copyright (C) 2016 EDIT

 * European Distributed Institute of Taxonomy

 * http://www.e-taxonomy.eu

 *

 * The contents of this file are subject to the Mozilla Public License Version 1.1

 * See LICENSE.TXT at the top of this package for the full license terms.

 */

package eu.etaxonomy.cdm.remote.config;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.nio.charset.Charset;

import java.util.Properties;

import org.apache.commons.io.FileUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.Import;

import org.springframework.core.annotation.Order;

import org.springframework.security.authentication.dao.DaoAuthenticationProvider;

import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;

import org.springframework.security.config.annotation.authentication.configurers.provisioning.InMemoryUserDetailsManagerConfigurer;

import org.springframework.security.config.annotation.web.builders.HttpSecurity;

import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;

import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

import eu.etaxonomy.cdm.config.ConfigFileUtil;

/**

 *

 * <b>NOTE</b> on nested @Configuration classes:

 *

 * When bootstrapping such an arrangement, only the outer class need be registered against the application context.

 * By virtue of being a nested @Configuration class, DatabaseConfig will be registered automatically. This avoids

 * the need to use an @Import annotation when the relationship between AppConfig DatabaseConfig is already implicitly

 * clear.

 *

 * @author a.kohlbecker

 * @since Oct 6, 2016

 */

@EnableWebSecurity

@Import(OAuth2ServerConfiguration.class)

public class MultiWebSecurityConfiguration {

    public static final String MANAGE_CLIENT = "MANAGE_CLIENT";

    public static final String ROLE_MANAGE_CLIENT = "ROLE_" + MANAGE_CLIENT;

    private static final String MANAGING_USERS_PROPERTIES = "managing-users.properties";

    @Autowired

    private ConfigFileUtil configFileUtil;

    /**

     * Check for full authentication for remoting services

     * @author a.kohlbecker

     * @since Oct 6, 2016

     */

    @Configuration

    @Order(2)

    public static class RemotingWebSecurityConfigurationAdapter extends WebSecurityConfigurerAdapter {

        @Override

        protected void configure(HttpSecurity http) throws Exception {

              // @formatter:off

                http

             .anonymous().disable()

             .antMatcher("/remoting/**")

                 .authorizeRequests().anyRequest().access("hasAnyRole('ROLE_ADMIN', 'ROLE_PROJECT_MANAGER', 'ROLE_REMOTING')")

                 .and()

             .csrf().disable()

             .httpBasic();

             // @formatter:on

        }

    }

    /**

     * Require full authentication on the OAuth2 authorization service

     * so that the user is requested to provide his credentials.

     *

     * @author a.kohlbecker

     * @since Jan 16, 2017

     */

    @Configuration

    @Order(1)

    public static class LoginWebSecurityConfigurationAdapter extends WebSecurityConfigurerAdapter {

        @Override

        protected void configure(HttpSecurity http) throws Exception {

              // @formatter:off

                http

             .anonymous().disable()

             .antMatcher("/oauth/authorize")

                 .authorizeRequests().anyRequest().fullyAuthenticated()

                 .and()

             .csrf().disable()

             .httpBasic();

             // @formatter:on

        }

    }

    /**

     * Allow anonymous authentication for all other services.

     *

     * <b>NOTE:</b> Further access restrictions are defined

     * in the OAuth2ServerConfiguration.

     *

     * @author a.kohlbecker

     * @since Oct 6, 2016

     */

    @Configuration

    public static class DefaultWebSecurityConfigurationAdapter extends WebSecurityConfigurerAdapter {

        @Override

        protected void configure(HttpSecurity http) throws Exception {

              // @formatter:off

                http

             .anonymous().and()

             .antMatcher("/**")

             .csrf().disable()

             .httpBasic();

             // @formatter:on

        }

    }

    @Autowired

    public void configureGlobal(AuthenticationManagerBuilder auth, DaoAuthenticationProvider daoAuthenticationProvider) throws Exception {

        // add the DaoAuthenticationProvider which is defined in

        // /cdmlib-services/src/main/resources/eu/etaxonomy/cdm/services_security.xml

        // if not added here it will not be added to the context as long as we are doing the

        // configuration explicitly here.

        auth.authenticationProvider(daoAuthenticationProvider);

        // Add an inMemoryUserManager to  enable access to the global ROLE_MANAGE_CLIENTs.

        // This is the casue for the need to do the configuration explicitly.

        InMemoryUserDetailsManagerConfigurer<AuthenticationManagerBuilder> inMemoryAuthConf = auth.inMemoryAuthentication();

        File managingUsersFile = new File(configFileUtil.perUserCdmFolder(), MANAGING_USERS_PROPERTIES);

        if(!managingUsersFile.exists()){

            makeManagingUsersPropertiesFile(managingUsersFile);

        }

        Properties users = new Properties();

        users.load(new FileInputStream(managingUsersFile));

        for(Object userName : users.keySet()){

            inMemoryAuthConf.withUser(userName.toString()).password(users.get(userName).toString()).roles(MANAGE_CLIENT);

        }

    }

    private void makeManagingUsersPropertiesFile(File propertiesFile) throws IOException {

        propertiesFile.createNewFile();

        FileUtils.write(

                propertiesFile,

                "# Managing users properties file\n"

                + "#\n"

                + "# This file has been autogenerated by the cdmlib.\n"

                + "# In case the file is deleted the cdmlib will re-create it during the next start up.\n"

                + "#\n"

                + "# This is a java properties file to populate the InMemoryUserDetailsManager in any of \n"

                + "# the cdm-remote instances with special global management users which are granted to \n"

                + "# access special web services. Among these are the /manage/ web services and those\n"

                + "# triggering long running tasks. For more details please refer to\n"

                + "# https://dev.e-taxonomy.eu/redmine/projects/edit/wiki/CdmAuthorisationAndAccessControl\n"

                + "# \n"

                + "# Global management users have the role " + ROLE_MANAGE_CLIENT + ".\n"

                + "# and will be available in each of the cdm-remote instances.\n"

                + "# Changes made to this file are applied after restarting a cdm instance.\n"

                + "#\n"

                + "# This properties file should contain entries in the form\n"

                + "#    username=password\n"

                + "# -------------------------------------------------------------------------------------------\n"

                + "#\n",

                Charset.defaultCharset()

                );

        }

}