Java Activiti工作流與OAuth2集成認證

在Java中，Activiti是一個流行的工作流引擎，而OAuth2是一種授權框架。將Activiti與OAuth2集成可以實現安全的訪問控制和認證。以下是實現這一集成的步驟：

1. 配置OAuth2服務器

首先，你需要一個OAuth2服務器來處理授權和令牌請求。你可以使用Spring Security來實現OAuth2服務器。

1.1 添加依賴

在你的pom.xml中添加Spring Security和OAuth2的依賴：

<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-oauth2-server</artifactId>
    <version>5.6.1</version>
</dependency>
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-oauth2-jose</artifactId>
    <version>5.6.1</version>
</dependency>

1.2 配置OAuth2服務器

創建一個配置類來設置OAuth2服務器：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.oauth2.server.authorization.config.annotation.web.configuration.OAuth2AuthorizationServerConfiguration;
import org.springframework.security.oauth2.server.authorization.settings.AuthorizationServerSettings;
import org.springframework.security.oauth2.server.authorization.settings.ClientSettings;
import org.springframework.security.oauth2.server.authorization.settings.TokenSettings;

@Configuration
public class OAuth2ServerConfig {

    @Bean
    public AuthorizationServerSettings authorizationServerSettings() {
        return AuthorizationServerSettings.builder().build();
    }

    @Bean
    public ClientSettings clientSettings() {
        return ClientSettings.builder().build();
    }

    @Bean
    public TokenSettings tokenSettings() {
        return TokenSettings.builder().build();
    }

    @Bean
    public OAuth2AuthorizationServerConfiguration authorizationServerConfiguration() {
        return new OAuth2AuthorizationServerConfiguration();
    }
}

1.3 配置客戶端

你需要配置客戶端的詳細信息，包括客戶端ID、密鑰和授權類型。

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.oauth2.server.authorization.config.annotation.web.configuration.OAuth2ClientConfigurer;
import org.springframework.security.oauth2.server.authorization.config.annotation.web.configuration.OAuth2ResourceServerConfigurer;
import org.springframework.security.oauth2.server.authorization.config.annotation.web.configurers.OAuth2AuthorizationServerConfigurerAdapter;
import org.springframework.security.oauth2.server.authorization.settings.ClientSettings;
import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationConverter;

@Configuration
public class OAuth2ClientConfig {

    @Bean
    public OAuth2ResourceServerConfigurer resourceServerConfigurer(JwtAuthenticationConverter jwtAuthenticationConverter) {
        return new OAuth2ResourceServerConfigurerAdapter() {
            @Override
            public void configure(HttpSecurity http) throws Exception {
                http.authorizeRequests()
                    .antMatchers("/api/**").authenticated();
            }
        };
    }

    @Bean
    public OAuth2ClientConfigurer clientConfigurer() {
        return new OAuth2ClientConfigurerAdapter() {
            @Override
            public void configure(ClientRegistrationRepository clientRegistrations) throws Exception {
                clientRegistrations.register(ClientRegistration.withRegistrationId("client")
                    .clientId("client-id")
                    .clientSecret("{noop}client-secret")
                    .authorizationUri("http://localhost:8080/oauth2/authorize")
                    .tokenUri("http://localhost:8080/oauth2/token")
                    .userInfoUri("http://localhost:8080/userinfo")
                    .userNameAttributeName(IdTokenClaimNames.SUB)
                    .jwkSetUri("http://localhost:8080/oauth2/jwks")
                    .clientName("Client")
                    .scope("read")
                    .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
                    .redirectUri("http://localhost:8080/callback")
                    .build());
            }
        };
    }
}

2. 配置Activiti

接下來，你需要配置Activiti以使用OAuth2進行認證。

2.1 配置Activiti的認證過濾器

你可以使用Spring Security的過濾器鏈來實現這一點。

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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 org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationConverter;
import org.springframework.security.oauth2.server.resource.authentication.OAuth2AuthenticationConverter;

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .antMatchers("/activiti/**").authenticated()
            .and()
            .oauth2Login();
    }

    @Bean
    public JwtAuthenticationConverter jwtAuthenticationConverter() {
        JwtAuthenticationConverter converter = new JwtAuthenticationConverter();
        // 配置JWT解析邏輯
        return converter;
    }
}

2.2 配置Activiti的認證過濾器鏈

在Activiti的配置文件中，添加OAuth2認證過濾器鏈。

<bean id="authenticationFilter" class="org.springframework.security.oauth2.server.resource.web.authentication.OAuth2AuthenticationProcessingFilter">
    <property name="authenticationManager" ref="authenticationManager"/>
</bean>

<http auto-config="true" use-expressions="true">
    <intercept-url pattern="/activiti/**" access="isAuthenticated()" />
    <form-login login-page="/login" />
    <logout />
</http>

<authentication-manager id="authenticationManager">
    <authentication-provider ref="oauth2AuthenticationProvider"/>
</authentication-manager>

<authentication-provider id="oauth2AuthenticationProvider">
    <authentication-converter ref="jwtAuthenticationConverter"/>
</authentication-provider>

3. 測試集成

現在，你可以測試Activiti與OAuth2的集成。啟動你的OAuth2服務器和Activiti應用，然后嘗試訪問受保護的資源。

總結

通過以上步驟，你已經成功地將Activiti與OAuth2集成，實現了安全的訪問控制和認證。你可以根據需要進一步定制和擴展這個集成。