flowable工作流引擎如何实现自定义权限管理
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场景: 对已有系统集成工作流,系统已经有一整套的权限管理模块,并且后期需要改造为单独的微服务,无法简单通过网上的建立视图进行解决,同时考虑到数据同步到 flowable 的方式,需要改造现有系统的代码,后期如果接入无人维护的系统,比较麻烦。如果选择自定义查询,可以更灵活定制。虽然会有一定的开发工作量,但比较符合目前的系统现状。
想法:参考 集成 LDAP 的实现方式
可以覆盖IdmIdentityServiceImpl类,或者直接实现IdmIdentityService接口,并使用实现类作为ProcessEngineConfiguration中的idmIdentityService参数。
参考 LDAPIdentityServiceImpl 的注册到 flowable 引擎配置类的实现方式
在SpringBoot中,可以向ProcessEngineConfigurationbean定义添加下面的代码实现:
@Bean public EngineConfigurationConfigurerMyIdmEngineConfigurer() { return idmEngineConfiguration -> idmEngineConfiguration .setIdmIdentityService(new IdmIdentityServiceHandler()); }
其中 IdmIdentityServiceHandler 同样参考 LDAPIdentityServiceImpl 继承 IdmIdentityServiceImpl 进行处理。
package com.jxlgzwh.handler; import org.flowable.common.engine.api.FlowableException; import org.flowable.idm.api.*; import org.flowable.idm.engine.impl.IdmIdentityServiceImpl; import org.flowable.idm.engine.impl.persistence.entity.GroupEntityImpl; import org.flowable.idm.engine.impl.persistence.entity.UserEntityImpl; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.ArrayList; import java.util.List; public class IdmIdentityServiceHandler extends IdmIdentityServiceImpl { private static final Logger LOGGER = LoggerFactory.getLogger(IdmIdentityServiceHandler.class); @Override public UserQuery createUserQuery() { System.out.println("用户查询--"); return null; } @Override public GroupQuery createGroupQuery() { System.out.println("用户组查询--"); return null; } @Override public boolean checkPassword(String userId, String password) { return true; } @Override public ListgetGroupsWithPrivilege(String name) { System.out.println("查询--"); throw new FlowableException("LDAP identity service doesn't support creating a new user"); } @Override public List getUsersWithPrivilege(String name) { System.out.println("查询--"); throw new FlowableException("LDAP identity service doesn't support creating a new user"); } @Override public User newUser(String userId) { throw new FlowableException("LDAP identity service doesn't support creating a new user"); } @Override public void saveUser(User user) { throw new FlowableException("LDAP identity service doesn't support saving an user"); } @Override public NativeUserQuery createNativeUserQuery() { throw new FlowableException("LDAP identity service doesn't support native querying"); } @Override public void deleteUser(String userId) { throw new FlowableException("LDAP identity service doesn't support deleting an user"); } @Override public Group newGroup(String groupId) { throw new FlowableException("LDAP identity service doesn't support creating a new group"); } @Override public NativeGroupQuery createNativeGroupQuery() { throw new FlowableException("LDAP identity service doesn't support native querying"); } @Override public void saveGroup(Group group) { throw new FlowableException("LDAP identity service doesn't support saving a group"); } @Override public void deleteGroup(String groupId) { throw new FlowableException("LDAP identity service doesn't support deleting a group"); } }
考虑到不需要对 flowable 的 权限进行维护,所以无需实现 新增 和修改方法。
验证: 写个方法进行测试是否生效
@RequestMapping(value = "is") @ResponseBody public String identityService() { identityService.createUserQuery(); return "测试"; }
访问方法,后台打印 “用户查询--“ 表明配置成功。
集成 LDAP 的完整代码 可以在GitHub查看代码:LDAPIdentityServiceImpl。
其中 用户查询 LDAPUserQueryImpl 继承了 UserQueryImpl ; 用户组查询 LDAPGroupQueryImpl extends GroupQueryImpl
/* Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.flowable.ldap.impl; import java.util.ArrayList; import java.util.List; import javax.naming.NamingEnumeration; import javax.naming.NamingException; import javax.naming.directory.InitialDirContext; import javax.naming.directory.SearchControls; import javax.naming.directory.SearchResult; import org.flowable.common.engine.impl.interceptor.CommandContext; import org.flowable.idm.api.User; import org.flowable.idm.engine.impl.UserQueryImpl; import org.flowable.idm.engine.impl.persistence.entity.UserEntity; import org.flowable.idm.engine.impl.persistence.entity.UserEntityImpl; import org.flowable.ldap.LDAPCallBack; import org.flowable.ldap.LDAPConfiguration; import org.flowable.ldap.LDAPTemplate; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class LDAPUserQueryImpl extends UserQueryImpl { private static final long serialVersionUID = 1L; private static final Logger LOGGER = LoggerFactory.getLogger(LDAPUserQueryImpl.class); protected LDAPConfiguration ldapConfigurator; public LDAPUserQueryImpl(LDAPConfiguration ldapConfigurator) { this.ldapConfigurator = ldapConfigurator; } @Override public long executeCount(CommandContext commandContext) { return executeQuery().size(); } @Override public ListexecuteList(CommandContext commandContext) { return executeQuery(); } protected List executeQuery() { if (getId() != null) { List result = new ArrayList<>(); result.add(findById(getId())); return result; } else if (getIdIgnoreCase() != null) { List result = new ArrayList<>(); result.add(findById(getIdIgnoreCase())); return result; } else if (getFullNameLike() != null) { return executeNameQuery(getFullNameLike()); } else if (getFullNameLikeIgnoreCase() != null) { return executeNameQuery(getFullNameLikeIgnoreCase()); } else { return executeAllUserQuery(); } } protected List executeNameQuery(String name) { String fullName = name.replaceAll("%", ""); String searchExpression = ldapConfigurator.getLdapQueryBuilder().buildQueryByFullNameLike(ldapConfigurator, fullName); return executeUsersQuery(searchExpression); } protected List executeAllUserQuery() { String searchExpression = ldapConfigurator.getQueryAllUsers(); return executeUsersQuery(searchExpression); } protected UserEntity findById(final String userId) { LDAPTemplate ldapTemplate = new LDAPTemplate(ldapConfigurator); return ldapTemplate.execute(new LDAPCallBack () { @Override public UserEntity executeInContext(InitialDirContext initialDirContext) { try { String searchExpression = ldapConfigurator.getLdapQueryBuilder().buildQueryByUserId(ldapConfigurator, userId); String baseDn = ldapConfigurator.getUserBaseDn() != null ? ldapConfigurator.getUserBaseDn() : ldapConfigurator.getBaseDn(); NamingEnumeration> namingEnum = initialDirContext.search(baseDn, searchExpression, createSearchControls()); UserEntity user = new UserEntityImpl(); while (namingEnum.hasMore()) { // Should be only one SearchResult result = (SearchResult) namingEnum.next(); mapSearchResultToUser(result, user); } namingEnum.close(); return user; } catch (NamingException ne) { LOGGER.error("Could not find user {} : {}", userId, ne.getMessage(), ne); return null; } } }); } protected List executeUsersQuery(final String searchExpression) { LDAPTemplate ldapTemplate = new LDAPTemplate(ldapConfigurator); return ldapTemplate.execute(new LDAPCallBack >() { @Override public List
executeInContext(InitialDirContext initialDirContext) { List result = new ArrayList<>(); try { String baseDn = ldapConfigurator.getUserBaseDn() != null ? ldapConfigurator.getUserBaseDn() : ldapConfigurator.getBaseDn(); NamingEnumeration> namingEnum = initialDirContext.search(baseDn, searchExpression, createSearchControls()); while (namingEnum.hasMore()) { SearchResult searchResult = (SearchResult) namingEnum.next(); UserEntity user = new UserEntityImpl(); mapSearchResultToUser(searchResult, user); result.add(user); } namingEnum.close(); } catch (NamingException ne) { LOGGER.debug("Could not execute LDAP query: {}", ne.getMessage(), ne); return null; } return result; } }); } protected void mapSearchResultToUser(SearchResult result, UserEntity user) throws NamingException { if (ldapConfigurator.getUserIdAttribute() != null) { user.setId(result.getAttributes().get(ldapConfigurator.getUserIdAttribute()).get().toString()); } if (ldapConfigurator.getUserFirstNameAttribute() != null) { try { user.setFirstName(result.getAttributes().get(ldapConfigurator.getUserFirstNameAttribute()).get().toString()); } catch (NullPointerException e) { user.setFirstName(""); } } if (ldapConfigurator.getUserLastNameAttribute() != null) { try { user.setLastName(result.getAttributes().get(ldapConfigurator.getUserLastNameAttribute()).get().toString()); } catch (NullPointerException e) { user.setLastName(""); } } if (ldapConfigurator.getUserEmailAttribute() != null) { try { user.setEmail(result.getAttributes().get(ldapConfigurator.getUserEmailAttribute()).get().toString()); } catch (NullPointerException e) { user.setEmail(""); } } } protected SearchControls createSearchControls() { SearchControls searchControls = new SearchControls(); searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE); searchControls.setTimeLimit(ldapConfigurator.getSearchTimeLimit()); return searchControls; } }
/* Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.flowable.ldap.impl; import java.util.ArrayList; import java.util.List; import javax.naming.NamingEnumeration; import javax.naming.NamingException; import javax.naming.directory.InitialDirContext; import javax.naming.directory.SearchControls; import javax.naming.directory.SearchResult; import org.flowable.common.engine.api.FlowableException; import org.flowable.common.engine.impl.interceptor.CommandContext; import org.flowable.idm.api.Group; import org.flowable.idm.engine.impl.GroupQueryImpl; import org.flowable.idm.engine.impl.persistence.entity.GroupEntity; import org.flowable.idm.engine.impl.persistence.entity.GroupEntityImpl; import org.flowable.ldap.LDAPCallBack; import org.flowable.ldap.LDAPConfiguration; import org.flowable.ldap.LDAPGroupCache; import org.flowable.ldap.LDAPTemplate; public class LDAPGroupQueryImpl extends GroupQueryImpl { private static final long serialVersionUID = 1L; protected LDAPConfiguration ldapConfigurator; protected LDAPGroupCache ldapGroupCache; public LDAPGroupQueryImpl(LDAPConfiguration ldapConfigurator, LDAPGroupCache ldapGroupCache) { this.ldapConfigurator = ldapConfigurator; this.ldapGroupCache = ldapGroupCache; } @Override public long executeCount(CommandContext commandContext) { return executeQuery().size(); } @Override public ListexecuteList(CommandContext commandContext) { return executeQuery(); } protected List executeQuery() { if (getUserId() != null) { return findGroupsByUser(getUserId()); } else if (getId() != null) { return findGroupsById(getId()); } else { return findAllGroups(); } } protected List findGroupsByUser(String userId) { // First try the cache (if one is defined) if (ldapGroupCache != null) { List groups = ldapGroupCache.get(userId); if (groups != null) { return groups; } } String searchExpression = ldapConfigurator.getLdapQueryBuilder().buildQueryGroupsForUser(ldapConfigurator, userId); List groups = executeGroupQuery(searchExpression); // Cache results for later if (ldapGroupCache != null) { ldapGroupCache.add(userId, groups); } return groups; } protected List findGroupsById(String id) { String searchExpression = ldapConfigurator.getLdapQueryBuilder().buildQueryGroupsById(ldapConfigurator, id); return executeGroupQuery(searchExpression); } protected List findAllGroups() { String searchExpression = ldapConfigurator.getQueryAllGroups(); List groups = executeGroupQuery(searchExpression); return groups; } protected List executeGroupQuery(final String searchExpression) { LDAPTemplate ldapTemplate = new LDAPTemplate(ldapConfigurator); return ldapTemplate.execute(new LDAPCallBack >() { @Override public List
executeInContext(InitialDirContext initialDirContext) { List groups = new ArrayList<>(); try { String baseDn = ldapConfigurator.getGroupBaseDn() != null ? ldapConfigurator.getGroupBaseDn() : ldapConfigurator.getBaseDn(); NamingEnumeration> namingEnum = initialDirContext.search(baseDn, searchExpression, createSearchControls()); while (namingEnum.hasMore()) { // Should be only one SearchResult result = (SearchResult) namingEnum.next(); GroupEntity group = new GroupEntityImpl(); if (ldapConfigurator.getGroupIdAttribute() != null) { group.setId(result.getAttributes().get(ldapConfigurator.getGroupIdAttribute()).get().toString()); } if (ldapConfigurator.getGroupNameAttribute() != null) { group.setName(result.getAttributes().get(ldapConfigurator.getGroupNameAttribute()).get().toString()); } if (ldapConfigurator.getGroupTypeAttribute() != null) { group.setType(result.getAttributes().get(ldapConfigurator.getGroupTypeAttribute()).get().toString()); } groups.add(group); } namingEnum.close(); return groups; } catch (NamingException e) { throw new FlowableException("Could not find groups " + searchExpression, e); } } }); } protected SearchControls createSearchControls() { SearchControls searchControls = new SearchControls(); searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE); searchControls.setTimeLimit(ldapConfigurator.getSearchTimeLimit()); return searchControls; } }
根据自己的业务需要,提供用户的管理功能。关键部分:
配置IdmEngineConfiguration参数
实现IdmIdentityService,可继承IdmIdentityServiceImpl
实现UserQuery,可继承UserQueryImpl
实现GroupQuery,可继承GroupQueryImpl
实现PrivilegeQuery,可继承PrivilegeQueryImpl
相当于做自己的权限管理系统的查询客户端。
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