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小编给大家分享一下flowable工作流引擎如何实现自定义权限管理，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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 EngineConfigurationConfigurer<SpringIdmEngineConfiguration> MyIdmEngineConfigurer() {
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 List<Group> getGroupsWithPrivilege(String name) {
System.out.println("查询--");
throw new FlowableException("LDAP identity service doesn't support creating a new user");
}
@Override
public List<User> 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 List<User> executeList(CommandContext commandContext) {
return executeQuery();
}
protected List<User> executeQuery() {
if (getId() != null) {
List<User> result = new ArrayList<>();
result.add(findById(getId()));
return result;
} else if (getIdIgnoreCase() != null) {
List<User> 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<User> executeNameQuery(String name) {
String fullName = name.replaceAll("%", "");
String searchExpression = ldapConfigurator.getLdapQueryBuilder().buildQueryByFullNameLike(ldapConfigurator, fullName);
return executeUsersQuery(searchExpression);
}
protected List<User> executeAllUserQuery() {
String searchExpression = ldapConfigurator.getQueryAllUsers();
return executeUsersQuery(searchExpression);
}
protected UserEntity findById(final String userId) {
LDAPTemplate ldapTemplate = new LDAPTemplate(ldapConfigurator);
return ldapTemplate.execute(new LDAPCallBack<UserEntity>() {
@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<User> executeUsersQuery(final String searchExpression) {
LDAPTemplate ldapTemplate = new LDAPTemplate(ldapConfigurator);
return ldapTemplate.execute(new LDAPCallBack<List<User>>() {
@Override
public List<User> executeInContext(InitialDirContext initialDirContext) {
List<User> 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 List<Group> executeList(CommandContext commandContext) {
return executeQuery();
}
protected List<Group> executeQuery() {
if (getUserId() != null) {
return findGroupsByUser(getUserId());
} else if (getId() != null) {
return findGroupsById(getId());
} else {
return findAllGroups();
}
}
protected List<Group> findGroupsByUser(String userId) {
// First try the cache (if one is defined)
if (ldapGroupCache != null) {
List<Group> groups = ldapGroupCache.get(userId);
if (groups != null) {
return groups;
}
}
String searchExpression = ldapConfigurator.getLdapQueryBuilder().buildQueryGroupsForUser(ldapConfigurator, userId);
List<Group> groups = executeGroupQuery(searchExpression);
// Cache results for later
if (ldapGroupCache != null) {
ldapGroupCache.add(userId, groups);
}
return groups;
}
protected List<Group> findGroupsById(String id) {
String searchExpression = ldapConfigurator.getLdapQueryBuilder().buildQueryGroupsById(ldapConfigurator, id);
return executeGroupQuery(searchExpression);
}
protected List<Group> findAllGroups() {
String searchExpression = ldapConfigurator.getQueryAllGroups();
List<Group> groups = executeGroupQuery(searchExpression);
return groups;
}
protected List<Group> executeGroupQuery(final String searchExpression) {
LDAPTemplate ldapTemplate = new LDAPTemplate(ldapConfigurator);
return ldapTemplate.execute(new LDAPCallBack<List<Group>>() {
@Override
public List<Group> executeInContext(InitialDirContext initialDirContext) {
List<Group> 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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