commit aa5632c8a07e91fc1f1b8a3259bd6dfb00e7ff38
Author: ohdarling88 <ohdarling88@gmail.com>
Date:   Mon Feb 3 14:10:29 2020 +0800

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..efca3b5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,62 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+cache
+/config.js
+.DS_Store
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f99e3b3
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2020 ohdarling88
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,139 @@
+# Virtual-LDAP
+
+Virtual-LDAP is a service used to bridge any other account services to the LDAP protocol. With Virtual-LDAP, you can use existing account services (such as DingTalk) as an authorization service for many open source projects.
+
+Virtual-LDAP has a provider architecture, so you can extend it with a custom provider to support any other account service, such as a database-based account service.
+
+Virtual-LDAP is not a complete implementation of LDAP and currently only supports partial binding, search, and modification requests. All directory groups and users will be obtained from the provider.
+
+The database used for Virtual-LDAP is used to store user passwords. Passwords will be hashed using SHA256 plus a salt value.
+
+
+
+## Configuration
+
+Virtual-LDAP using JavaScript to configure all settings, include DN, admins, database, provider and custom groups.
+
+For every configuration items, see example config file below.
+
+```javascript
+module.exports = {
+  ldap: {
+    // LDAP serve port, it is a insecure port, please connect with ldap://
+    listenPort: 1389,
+    // Base DN will be o=Example,dc=example,dc=com
+    // Groups base DN will be ou=Groups,o=Example,dc=example,dc=com
+    // Users base DN will be ou=People,o=Example,dc=example,dc=com
+    rootDN: 'dc=example,dc=com',
+    organization: 'Example',
+    // Admins who can search or modify directory
+    admins: [
+      {
+        // Bind DN will be cn=keycloak,dc=example,dc=com
+        commonName: 'keycloak',
+        password: 'keycloak',
+        // Can this admin modify user's password
+        canModifyEntry: true,
+      },
+      {
+        commonName: 'jenkins',
+        password: 'jenkins',
+        canModifyEntry: false,
+      },
+    ]
+  },
+  // Database for storing users' password
+  database: {
+    type: 'mysql',
+    host: '127.0.0.1',
+    port: '23306',
+    user: 'root',
+    password: '123456',
+    database: 'vldap',
+  },
+  // Provider for providen account service
+  provider: {
+    name: 'dingtalk',
+    appKey: '__APPKEY__',
+    appSecret: '__APPSECRET__',
+  },
+  // Custom groups, base DN will be ou=CustomGroups,ou=Groups,o=Example,dc=example,dc=com
+  customGroups: [
+    {
+      // DN will be ou=Jenkins Admins,ou=CustomGroups,ou=Groups,o=Example,dc=example,dc=com
+      name: 'Jenkins Admins',
+      // User with these mails will be added to the group
+      members: [ 'jenkins@example.com' ],
+    }
+  ]
+}
+```
+
+
+
+## LDAP DN
+
+For Virtual-LDAP using the above configuration file, the commonly used DNs are as follows.
+
+**Root DN**
+
+`dc=example,dc=com`
+
+**Search Directory Bind DN**
+
+`cn=keycloak,dc=example,dc=com`
+
+**Groups Base DN**
+
+`ou=Groups,o=Example,dc=example,dc=com`
+
+**Users Base DN**
+
+`ou=People,o=Example,dc=example,dc=com`
+
+**Custom Groups Base DN**
+
+`ou=CustomGroups,ou=Groups,o=Example,dc=example,dc=com`
+
+**Jenkins Admins DN**
+
+`ou=Jenkins Admins,ou=CustomGroups,ou=Groups,o=Example,dc=example,dc=com`
+
+**Typical User DN**
+
+`mail=user@example.com,ou=People,o=Example,dc=example,dc=com`
+
+
+
+## Run Virtual-LDAP
+
+Virtual-LDAP can run from source or run as a service in another project.
+
+### Run from source
+
+```bash
+git clone https://github.com/ohdarling/virtual-ldap
+cd virtual-ldap
+npm start
+```
+
+### Run as a service
+
+```javascript
+const server = require('virtual-ldap');
+server.setupVirtualLDAPServer(require("./config"));
+server.runVirtualLDAPServer();
+```
+
+
+
+## Testing with ApacheDirectoryStudio
+
+<img src="screenshots/1-create-connection.png" alt="create connection" width="624" /><img src="screenshots/2-base-auth.png" alt="auth" width="624" />
+
+<img src="screenshots/3-ldap-browse.png" alt="ldap browse" width="878" />
+
+
+## License
+
+MIT License
diff --git a/config.example.js b/config.example.js
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--- /dev/null
+++ b/config.example.js
@@ -0,0 +1,50 @@
+module.exports = {
+  ldap: {
+    // LDAP serve port, it is a insecure port, please connect with ldap://
+    listenPort: 1389,
+    // Base DN will be o=Example,dc=example,dc=com
+    // Groups base DN will be ou=Groups,o=Example,dc=example,dc=com
+    // Users base DN will be ou=People,o=Example,dc=example,dc=com
+    rootDN: 'dc=example,dc=com',
+    organization: 'Example',
+    // Admins who can search or modify directory
+    admins: [
+      {
+        // Bind DN will be cn=keycloak,dc=example,dc=com
+        commonName: 'keycloak',
+        password: 'keycloak',
+        // Can this admin modify user's password
+        canModifyEntry: true,
+      },
+      {
+        commonName: 'jenkins',
+        password: 'jenkins',
+        canModifyEntry: false,
+      },
+    ]
+  },
+  // Database for storing users' password
+  database: {
+    type: 'mysql',
+    host: '127.0.0.1',
+    port: '23306',
+    user: 'root',
+    password: '123456',
+    database: 'vldap',
+  },
+  // Provider for providen account service
+  provider: {
+    name: 'dingtalk',
+    appKey: '__APPKEY__',
+    appSecret: '__APPSECRET__',
+  },
+  // Custom groups, base DN will be ou=CustomGroups,ou=Groups,o=Example,dc=example,dc=com
+  customGroups: [
+    {
+      // DN will be ou=Jenkins Admins,ou=CustomGroups,ou=Groups,o=Example,dc=example,dc=com
+      name: 'Jenkins Admins',
+      // User with these mails will be added to the group
+      members: [ 'jenkins@example.com' ],
+    }
+  ]
+}
diff --git a/index.js b/index.js
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--- /dev/null
+++ b/index.js
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+const server = require("./lib");
+
+if (require.main === module) {
+  server.setupVirtualLDAPServer(require("./config.example"));
+  server.runVirtualLDAPServer();
+} else {
+  module.exports = server;
+}
diff --git a/lib/config.js b/lib/config.js
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index 0000000..645a54c
--- /dev/null
+++ b/lib/config.js
@@ -0,0 +1 @@
+module.exports = require("./index").serverConfig;
\ No newline at end of file
diff --git a/lib/db/db.js b/lib/db/db.js
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--- /dev/null
+++ b/lib/db/db.js
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+const {
+  type: dbType
+} = require('../config').database;
+
+const {
+  dbSelect,
+  dbInsert,
+  dbUpdate,
+} = require('./' + dbType);
+
+const TABLE_USER_CREDENTIALS = 'user_credentials';
+
+async function getDBRecordForUserId(uid) {
+  const [ record ] = await dbSelect(TABLE_USER_CREDENTIALS, { uid });
+  if (record) {
+    return record;
+  }
+
+  return {
+    userid: uid,
+    password: '123456',
+  };
+}
+
+
+async function saveDBRecordForUserId(uid, data) {
+  const [ record ] = await await dbSelect(TABLE_USER_CREDENTIALS, { uid });
+  if (record) {
+    await dbUpdate(TABLE_USER_CREDENTIALS, data, { uid });
+  } else {
+    await dbInsert(TABLE_USER_CREDENTIALS, Object.assign({ uid }, data));
+  }
+}
+
+module.exports = {
+  getDBRecordForUserId,
+  saveDBRecordForUserId,
+};
diff --git a/lib/db/dbinit.sql b/lib/db/dbinit.sql
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--- /dev/null
+++ b/lib/db/dbinit.sql
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+SET NAMES utf8mb4;
+SET FOREIGN_KEY_CHECKS = 0;
+
+-- ----------------------------
+-- Table structure for user_credentials
+-- ----------------------------
+DROP TABLE IF EXISTS `user_credentials`;
+CREATE TABLE `user_credentials` (
+  `uid` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL,
+  `password` varchar(200) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
+  `otpsecret` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
+  `created_at` datetime DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`uid`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+SET FOREIGN_KEY_CHECKS = 1;
diff --git a/lib/db/memory.js b/lib/db/memory.js
new file mode 100644
index 0000000..5c734ad
--- /dev/null
+++ b/lib/db/memory.js
@@ -0,0 +1,19 @@
+const table = {};
+
+async function dbSelect(table, { uid }) {
+  return [ table[uid] ];
+}
+
+async function dbUpdate(table, params, { uid }) {
+  table[uid] = Object.assign({}, table[uid] || {}, params);
+}
+
+async function dbInsert(table, params) {
+  table[params.uid] = params;
+}
+
+module.exports = {
+  dbSelect,
+  dbUpdate,
+  dbInsert,
+};
diff --git a/lib/db/mysql.js b/lib/db/mysql.js
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--- /dev/null
+++ b/lib/db/mysql.js
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+const mysql = require('mysql2');
+
+const {
+  database: dbConfig,
+} = require('../config');
+
+let dbConnected = false;
+let dbPool = null;
+
+async function connect() {
+  if (!dbConnected) {
+    const opts = Object.assign({}, dbConfig);
+    delete opts.type;
+    dbPool = mysql.createPool(opts).promise();
+    dbConnected = true;
+  }
+}
+
+async function dbQuery(sql, params) {
+  connect();
+  const [ rows, fields ] = await dbPool.query(sql, params);
+  return rows;
+}
+
+async function dbSelect(table, params) {
+  const fields = Object.keys(params);
+  const values = fields.map(k => params[k]);
+  const sql = `SELECT * FROM ${table} WHERE ${fields.map(k => `${k}=?`).join(' AND ')}`;
+  return dbQuery(sql, values);
+}
+
+async function dbUpdate(table, params, conditions) {
+  const fields = Object.keys(params);
+  const values = fields.map(k => params[k]);
+  let conditionSQL = '';
+  if (conditions) {
+    const cfields = Object.keys(conditions);
+    const cvalues = cfields.map(k => conditions[k]);
+    conditionSQL = ` WHERE ${cfields.map(k => `${k}=?`).join(' AND ')}`;
+    values.push(...cvalues);
+  }
+  const sql = `UPDATE ${table} SET ${fields.map(k => `${k}=?`).join(', ')} ${conditionSQL}`;
+  return dbQuery(sql, values);
+}
+
+async function dbInsert(table, params) {
+  const fields = Object.keys(params);
+  const values = fields.map(k => params[k]);
+  const sql = `INSERT INTO ${table} (${fields.join(', ')}) VALUES (${fields.map(k => '?').join(', ')})`;
+  return dbQuery(sql, values);
+}
+
+async function dbDelete(table, conditions) {
+  const values = [];
+  let conditionSQL = '';
+  if (conditions) {
+    const cfields = Object.keys(conditions);
+    const cvalues = fields.map(k => conditions[k]);
+    conditionSQL = ` WHERE ${cfields.map(k => `${k}=?`).join(' AND ')}`;
+    values.push(...cvalues);
+  }
+  const sql = `DELETE FROM ${table} ${conditionSQL}`
+  return dbQuery(sql, values);
+}
+
+module.exports = {
+  dbQuery,
+  dbSelect,
+  dbUpdate,
+  dbInsert,
+  dbDelete,
+};
diff --git a/lib/index.js b/lib/index.js
new file mode 100644
index 0000000..2589a4e
--- /dev/null
+++ b/lib/index.js
@@ -0,0 +1,17 @@
+require('log-node')();
+
+const serverConfig = {};
+
+function setupVirtualLDAPServer(config) {
+  Object.assign(serverConfig, config);
+}
+
+function runVirtualLDAPServer() {
+  require("./server").runVirtualLDAPServer();
+}
+
+module.exports = {
+  serverConfig,
+  setupVirtualLDAPServer,
+  runVirtualLDAPServer,
+};
diff --git a/lib/providers/dingtalk.js b/lib/providers/dingtalk.js
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--- /dev/null
+++ b/lib/providers/dingtalk.js
@@ -0,0 +1,292 @@
+const axios = require('axios');
+const log = require('log').get('dingtalk-provider');
+
+const {
+  makeGroupEntry,
+  makePersonEntry,
+  makeOrganizationUnitEntry,
+  addMemberToGroup,
+} = require('../utilities/ldap');
+const {
+  saveCacheToFile,
+  loadCacheFromFile,
+} = require('../utilities/cache');
+
+let appKey = '';
+let appSecret = '';
+let accessToken = '';
+
+let allLDAPUsers = [];
+let allLDAPOrgUnits = [];
+let allLDAPGroups = [];
+let allLDAPEntries = [];
+
+function api(path) {
+  return `https://oapi.dingtalk.com/${path}?access_token=${accessToken}`;
+}
+
+function parseName(name) {
+    // 如果名字没有空格，以中文处理，第一个字为姓，其他为名
+    // 如果有空格，以英文处理，最后一个单词为姓，其他为名
+    let givenName = name.substr(1);
+    let sn = name.substr(0, 1);
+    if (name.indexOf(' ') > 0) {
+      const parts = name.split(' ');
+      sn = parts.pop();
+      givenName = parts.join(' ');
+    }
+
+    return { givenName, sn };
+}
+
+async function ddGet(path, params) {
+  const apiUrl = path.substr(0, 8) === 'https://' ? path : api(path);
+  const ret = await axios(apiUrl, { params }).catch(e => {
+    log.error("Dingtalk API error", e);
+    return null;
+  });
+
+  if (ret && ret.data) {
+    if (ret.data.errcode != 0) {
+      log.error('Dingtalk API error', ret.data);
+      return null;
+    } else {
+      return ret.data;
+    }
+  } else {
+    log.error('Dingtalk API error', ret);
+  }
+
+  return null;
+}
+
+async function getToken() {
+  const token = await ddGet(`https://oapi.dingtalk.com/gettoken?appkey=${appKey}&appsecret=${appSecret}`);
+  if (token && token.access_token) {
+    accessToken = token.access_token;
+  } else {
+    log.error('Get access token failed', token);
+  }
+}
+
+/*
+{
+  '100560627': {
+    ext: '{"faceCount":"92"}',
+    createDeptGroup: true,
+    name: 'Product & Dev / 产品技术',
+    id: 100560627,
+    autoAddUser: true,
+    parentid: 111865024,
+    dn: 'ou=Product & Dev / 产品技术, ou=全员, o=LongBridge, dc=longbridge-inc, dc=com'
+  },
+  */
+async function fetchAllDepartments() {
+  let allDeps = loadCacheFromFile('dingtalk_groups.json');
+  if (!allDeps) {
+    const deps = await ddGet('department/list', {
+      fetch_child: true,
+      id: 1,
+    });
+
+    if (!deps) {
+      return [];
+    }
+    log.info('Got', deps.department.length, 'departments');
+
+    const depsMap = {};
+    deps.department.forEach(d => {
+      d.name = d.name.replace(/ \/ /g, ' - ').replace(/\//g, '&').trim();
+      depsMap[d.id] = d;
+    });
+
+    allDeps = Object.values(depsMap);
+
+    saveCacheToFile('dingtalk_groups.json', allDeps);
+  }
+
+  const depsMap = {};
+  allDeps.forEach(d => { depsMap[d.id] = d; });
+  allDeps.forEach(d => {
+    let obj = d;
+    let dn = [ `ou=${obj.name}` ];
+    while (obj.parentid !== 1) {
+      obj = depsMap[obj.parentid];
+      dn.push(`ou=${obj.name}`);
+    }
+    d.dn = dn.join(',');
+  });
+
+  return allDeps;
+}
+
+/*
+{
+  unionid: 'DLB1ru0iiZ6rB8z4juaJwWAiEiE',
+  openId: 'DLB1ru0iiZ6rB8z4juaJwWAiEiE',
+  remark: '',
+  userid: '0156594846753096123',
+  isBoss: false,
+  hiredDate: 1539532800000,
+  tel: '',
+  department: [ 109334341 ],
+  workPlace: '杭州',
+  email: '',
+  order: 177917621779460500,
+  isLeader: false,
+  mobile: '18815286506',
+  active: true,
+  isAdmin: false,
+  avatar: 'https://static-legacy.dingtalk.com/media/lADPACOG819UTLzNAu7NAu4_750_750.jpg',
+  isHide: false,
+  orgEmail: 'ke.xu@longbridge.sg',
+  jobnumber: '0049',
+  name: '徐克',
+  extattr: {},
+  stateCode: '86',
+  position: 'iOS开发工程师'
+}
+*/
+async function fetchDepartmentUsers(department) {
+  log.info('get users for department', department);
+  const userlist = [];
+  let hasMore = true;
+  let offset = 0;
+
+  while (hasMore) {
+    const users = await ddGet('user/listbypage', {
+      department_id: department.id,
+      offset,
+      size: 100,
+      order: 'entry_asc',
+    });
+    userlist.push(...users.userlist);
+    hasMore = users.hasMore;
+  }
+
+  userlist.forEach(u => {
+    u.firstDepartment = department;
+  });
+
+  return userlist;
+}
+
+async function fetchAllUsers(departments) {
+  let allUsers = loadCacheFromFile('dingtalk_users.json');
+  if (!allUsers && departments.length > 0) {
+    allUsers = [];
+    for (let i = 0; i < departments.length; ++i) {
+      allUsers.push(...(await fetchDepartmentUsers(departments[i])));
+    }
+    saveCacheToFile('dingtalk_users.json', allUsers);
+  }
+
+  return allUsers;
+}
+
+async function setupProvider(config) {
+  appKey = config.appKey;
+  appSecret = config.appSecret;
+  await reloadFromDingtalkServer();
+}
+
+async function reloadFromDingtalkServer() {
+  await getToken();
+
+  // 获取所有部门
+  let allDepartments = await fetchAllDepartments();
+
+  // 映射到 organizationalUnit
+  const allDepartmentsMap = {};
+  allLDAPOrgUnits = allDepartments.map(d => {
+    allDepartmentsMap[d.id] = d;
+    return makeOrganizationUnitEntry(d.dn, d.name, {
+      groupid: d.id,
+    });
+  });
+
+  // 映射到 groupOfNames
+  const allLDAPGroupsMap = [];
+  allLDAPGroups = allDepartments.map(d => {
+    const g = makeGroupEntry(d.dn, d.name, [], {
+      groupid: d.id,
+    });
+    allLDAPGroupsMap[d.id] = g;
+    return g;
+  });
+
+  Object.values(allDepartmentsMap).forEach(dep => {
+    if (dep.parentid != 1) {
+      const parentDep = allDepartmentsMap[dep.parentid];
+      addMemberToGroup(allLDAPGroupsMap[dep.id], allLDAPGroupsMap[parentDep.id]);
+    }
+  })
+
+  // 按部门获取所有员工
+  const allUsers = await fetchAllUsers(allDepartments);
+
+  const allUsersMap = {};
+  allLDAPUsers = allUsers.filter(u => {
+    if (!allUsersMap[u.userid]) {
+      allUsersMap[u.userid] = 1;
+      return u.active;
+    }
+    return false;
+  }).map(u => {
+    const mail = (u.orgEmail || u.email).toLowerCase();
+    const dn = `mail=${mail},${u.firstDepartment.dn}`;
+
+    const { givenName, sn } = parseName(u.name);
+
+    // 映射到 iNetOrgPerson
+    const personEntry = makePersonEntry(dn, {
+      uid: u.userid,
+      title: u.position,
+      mobileTelephoneNumber: u.mobile,
+      cn: u.name,
+      givenName,
+      sn,
+      mail,
+      avatarurl: u.avatar,
+    });
+
+    // 将用户加到组里
+    u.department.forEach(depId => {
+      let parentDep = allDepartmentsMap[depId];
+      // allLDAPGroupsMap[parentDep.id].attributes.member.push(personEntry.dn);
+      while (parentDep && parentDep.id !== 1) {
+        addMemberToGroup(personEntry, allLDAPGroupsMap[parentDep.id]);
+        // console.log('add member', personEntry.attributes.cn, 'to', allLDAPGroupsMap[parentDep.id].attributes.cn);
+        parentDep = allDepartmentsMap[parentDep.parentid];
+      }
+    })
+
+    return personEntry;
+  });
+
+  allLDAPEntries = [].concat(allLDAPGroups, allLDAPOrgUnits, allLDAPUsers);
+}
+
+function getAllLDAPEntries() {
+  return allLDAPEntries;
+}
+
+function reloadEntriesFromProvider() {
+  log.info('Reload entries from Dingtalk');
+  reloadFromDingtalkServer();
+}
+
+
+// if (0) {
+//   (async function() {
+//     await setupProvider(require('../config').provider);
+//     log.info(getAllLDAPEntries());
+//   })();
+//   setTimeout(() => {}, 0);
+// }
+
+module.exports = {
+  setupProvider,
+  getAllLDAPEntries,
+  reloadEntriesFromProvider,
+};
diff --git a/lib/server.js b/lib/server.js
new file mode 100644
index 0000000..c0a1596
--- /dev/null
+++ b/lib/server.js
@@ -0,0 +1,246 @@
+const ldap = require('ldapjs');
+const log = require('log').get('server');
+const CronJob = require('cron').CronJob;
+
+const {
+  ldap: ldapConfig,
+} = require('./config');
+const { parseDN, parseFilter } = ldap;
+const {
+  validateUserPassword,
+  storeUserPassword,
+} = require('./utilities/password');
+const {
+  getBaseEntries,
+  getRootDN,
+  getOrganizationBaseDN,
+  validateAdminPassword,
+  validateAdminPermission,
+} = require('./utilities/ldap');
+const {
+  createProvider,
+  getProviderLDAPEntries,
+  reloadEntriesFromProvider,
+} = require('./utilities/provider');
+const {
+  getLDAPCustomGroupEntries,
+} = require('./utilities/custom_groups');
+const {
+  getDBRecordForUserId,
+  saveDBRecordForUserId,
+} = require('./db/db');
+
+let server = ldap.createServer();
+
+// equalsDN for comparing dn in case-insensitive
+function equalsDN(a, b) {
+  a = parseDN((a instanceof String ? a : a.toString()).toLowerCase());
+  b = parseDN((b instanceof String ? b : b.toString()).toLowerCase());
+  return a.equals(b);
+}
+
+function getPersonMatchedDN(reqDN) {
+  const personFilter = parseFilter('(objectclass=inetOrgPerson)');
+  const [ matchedUser ] = getProviderLDAPEntries().filter(entry => {
+    return equalsDN(reqDN, entry.dn) && personFilter.matches(entry.attributes);
+  });
+  return matchedUser;
+}
+
+function authorize(req, res, next) {
+  log.debug('===> authorize info');
+  log.debug('req type', req.constructor.name);
+  log.debug('reqDN', (req.baseObject || '').toString());
+  log.debug('bindDN', req.connection.ldap.bindDN.toString());
+  log.debug('====');
+  const bindDN = req.connection.ldap.bindDN;
+  const rootDN = parseDN(getRootDN());
+
+  // person can search itself
+  if (req instanceof ldap.SearchRequest) {
+    if (equalsDN(bindDN, req.baseObject)) {
+      return next();
+    }
+  }
+
+  // root admin can do everything
+  if (equalsDN(bindDN.parent(), rootDN)) {
+    return next();
+  }
+
+  return next(new ldap.InsufficientAccessRightsError());
+}
+
+
+// DSE
+server.search('', authorize, function(req, res, next) {
+	var baseObject = {
+		dn: '',
+		structuralObjectClass: 'OpenLDAProotDSE',
+		configContext: 'cn=config',
+		attributes: {
+			objectclass: ['top', 'OpenLDAProotDSE'],
+			namingContexts: [ getRootDN() ],
+			supportedLDAPVersion: ['3'],
+			subschemaSubentry:['cn=Subschema']
+		}
+	};
+	log.info("scope "+req.scope+" filter "+req.filter+" baseObject "+req.baseObject);
+	if('base' == req.scope
+		&& '(objectclass=*)' == req.filter.toString()
+		&& req.baseObject == ''){
+		res.send(baseObject);
+	}
+
+	//log.info('scope: ' + req.scope);
+	//log.info('filter: ' + req.filter.toString());
+	//log.info('attributes: ' + req.attributes);
+	res.end();
+	return next();
+});
+
+
+server.search('cn=Subschema', authorize, function(req, res, next) {
+	var schema = {
+		dn: 'cn=Subschema',
+		attributes: {
+			objectclass: ['top', 'subentry', 'subschema', 'extensibleObject'],
+			cn: ['Subschema']
+		}
+	};
+	res.send(schema);
+	res.end();
+	return next();
+});
+
+
+server.search(getRootDN(), authorize, (req, res, next) => {
+  log.info("search req scope " + req.scope + " filter " + req.filter + " baseObject " + req.baseObject);
+  // console.log('sizeLimit', req.sizeLimit, 'timeLimit', req.timeLimit);
+  const reqDN = parseDN(req.baseObject.toString().toLowerCase());
+
+  const comparators = {
+    'one': (objDN) => {
+      return equalsDN(reqDN, objDN.parent());
+    },
+    'sub': (objDN) => {
+      return equalsDN(reqDN, objDN) || reqDN.parentOf(objDN);
+    },
+    'base': (objDN) => {
+      return equalsDN(reqDN, objDN);
+    },
+  }
+
+  const comparator = comparators[req.scope];
+  if (comparator) {
+    [
+      ...getBaseEntries(),
+      ...getProviderLDAPEntries(),
+      ...getLDAPCustomGroupEntries(),
+    ].filter(entry => {
+      return comparator(parseDN(entry.dn.toLowerCase())) && req.filter.matches(entry.attributes);
+    }).forEach(entry => {
+      log.debug('send entry', entry.dn);
+      res.send(entry);
+    });
+  }
+
+  res.end();
+  return next();
+});
+
+server.modify(getOrganizationBaseDN(), authorize, async (req, res, next) => {
+//   DN: uid=zhangsan@alibaba-inc.com, ou=HR, o=LongBridge, dc=longbridge-inc, dc=com
+// changes:
+//   operation: replace
+//   modification: {"type":"userpassword","vals":["{SMD5}jFCfdWsVs6GF/1CO2+2ZBwIevCudAH7v"]}
+  const reqDN = parseDN(req.dn.toString().toLowerCase());
+  const username = req.connection.ldap.bindDN.rdns[0].attrs.cn.value;
+  log.debug('modify req', reqDN.toString());
+  if (!validateAdminPermission(username, 'canModifyEntry')) {
+    return next(new ldap.InsufficientAccessRightsError());
+  }
+
+  const matchedUser = getPersonMatchedDN(reqDN);
+  // console.log('modify user', matchedUser);
+  if (matchedUser) {
+    // console.log('DN: ' + req.dn.toString());
+    // console.log('changes:');
+    for (let i = 0; i < req.changes.length; ++i) {
+      const c = req.changes[i];
+      // console.log('  operation: ' + c.operation);
+      // console.log('  modification: ' + c.modification.toString());
+      if (c.operation === 'replace' && c.modification.type === 'userpassword') {
+        let newpass = c.modification.vals[0];
+        if (newpass.substr(0, 9) !== '{SSHA256}') {
+          newpass = storeUserPassword(newpass);
+        }
+        await saveDBRecordForUserId(matchedUser.attributes.uid, {
+          password: newpass,
+        });
+        // console.log('modify user', matchedUser.attributes.uid, 'pass to', newpass);
+      }
+
+      if (c.operation === 'replace' && c.modification.type === 'otpsecret') {
+        let newsecret = c.modification.vals[0];
+        // console.log('modify user', matchedUser.dn, 'otp secret to', newsecret);
+        await saveDBRecordForUserId(matchedUser.attributes.uid, {
+          otpsecret: newsecret,
+        });
+      }
+    }
+  }
+  res.end();
+  return next();
+});
+
+server.bind(getRootDN(), async (req, res, next) => {
+  const reqDN = parseDN(req.dn.toString().toLowerCase());
+  log.debug('bind req', reqDN.toString())
+  // console.log('bind PW: ' + req.credentials);
+  if (parseDN(getRootDN().toLowerCase()).equals(reqDN.parent())) {
+    // admins
+    const username = reqDN.rdns[0].attrs.cn.value;
+    if (validateAdminPassword(username, req.credentials)) {
+      res.end();
+      return next();
+    } else {
+      return next(new ldap.InvalidCredentialsError());
+    }
+
+  } else if (parseDN(getOrganizationBaseDN().toLowerCase()).parentOf(reqDN)) {
+    // users
+    const matchedUser = getPersonMatchedDN(reqDN);
+    if (matchedUser) {
+      const record = await getDBRecordForUserId(matchedUser.attributes.uid);
+      if (validateUserPassword(record.password || '123456', req.credentials)) {
+        res.end();
+        return next();
+      } else {
+        log.debug('password failed');
+        return next(new ldap.InvalidCredentialsError());
+      }
+    } else {
+      log.debug('user not found');
+      return next(new ldap.InvalidCredentialsError());
+    }
+  }
+
+  return next(new ldap.InsufficientAccessRightsError());
+});
+
+function runVirtualLDAPServer() {
+  server.listen(ldapConfig.listenPort, async function() {
+    await createProvider();
+    log.info('virtual-ldap listening at ' + server.url);
+  });
+
+  // reload data from server every hour
+  new CronJob('0 0 * * * *', () => {
+    reloadEntriesFromProvider();
+  }, null, true, 'Asia/Shanghai').start();
+}
+
+module.exports = {
+  runVirtualLDAPServer,
+};
diff --git a/lib/utilities/cache.js b/lib/utilities/cache.js
new file mode 100644
index 0000000..adf2576
--- /dev/null
+++ b/lib/utilities/cache.js
@@ -0,0 +1,47 @@
+const path = require('path');
+const fs = require('fs');
+const log = require('log').get('cache');
+
+function getCachePath(name) {
+  const folder = path.join(__dirname, '..', '..', 'cache');
+  if (!fs.existsSync(folder)) {
+    fs.mkdirSync(folder);
+  }
+  const p = path.resolve(path.join(folder, name));
+  return p
+}
+
+function saveCacheToFile(name, obj, expires = 3600) {
+  const p = getCachePath(name);
+  const data = {
+    expires: new Date((new Date() * 1 + expires * 1000)).toISOString(),
+    data: obj,
+  };
+  fs.writeFileSync(p, JSON.stringify(data), { encoding: 'utf8' });
+}
+
+function loadCacheFromFile(name) {
+  const p = getCachePath(name);
+  let data = null;
+  if (fs.existsSync(p)) {
+    const content = fs.readFileSync(p, { encoding: 'utf8' });
+    try {
+      const obj = JSON.parse(content);
+      if (obj && obj.data && obj.expires) {
+        const now = new Date() * 1;
+        const expires = new Date(obj.expires) * 1;
+        if (now < expires) {
+          data = obj.data;
+        }
+      }
+    } catch (e) {
+      log.warn('Invalid cache for', name);
+    }
+  }
+  return data;
+}
+
+module.exports = {
+  saveCacheToFile,
+  loadCacheFromFile,
+};
diff --git a/lib/utilities/custom_groups.js b/lib/utilities/custom_groups.js
new file mode 100644
index 0000000..d387570
--- /dev/null
+++ b/lib/utilities/custom_groups.js
@@ -0,0 +1,44 @@
+const {
+  parseFilter,
+} = require('ldapjs');
+const {
+  getProviderLDAPEntries,
+} = require('./provider');
+const {
+  makeGroupEntry,
+  addMemberToGroup,
+} = require('./ldap');
+const {
+  customGroups,
+} = require('../config');
+
+
+function getLDAPCustomGroupEntries() {
+  if (!customGroups) {
+    return [];
+  }
+
+  const baseGroupEntry = makeGroupEntry('ou=CustomGroups', 'CustomGroups', []);
+  const allEntries = getProviderLDAPEntries();
+
+  const groupEntries = customGroups.map(g => {
+    const groupEntry = makeGroupEntry(`ou=${g.name},ou=CustomGroups`, g.name, []);
+    addMemberToGroup(groupEntry, baseGroupEntry);
+
+    const members = allEntries.filter(o => {
+      return g.members.indexOf(o.attributes.mail) >= 0;
+    });
+
+    members.forEach(p => {
+      addMemberToGroup(p, groupEntry);
+    });
+
+    return groupEntry;
+  });
+
+  return [].concat(baseGroupEntry, groupEntries);
+}
+
+module.exports = {
+  getLDAPCustomGroupEntries,
+};
diff --git a/lib/utilities/ldap.js b/lib/utilities/ldap.js
new file mode 100644
index 0000000..ea6d84d
--- /dev/null
+++ b/lib/utilities/ldap.js
@@ -0,0 +1,225 @@
+const {
+  ldap: ldapConfig,
+} = require('../config');
+
+let cachedBaseEntries = null;
+
+function getRootDN() {
+  return ldapConfig.rootDN;
+}
+
+function makeDN(...parts) {
+  return parts.join(',');
+}
+
+function getOrganizationBaseDN() {
+  return makeDN('o=' + ldapConfig.organization, getRootDN());
+}
+
+function getPeopleBaseDN() {
+  const dn = makeDN('ou=People', getOrganizationBaseDN());
+  return dn;
+}
+
+function getGroupsBaseDN() {
+  const dn = makeDN('ou=Groups', getOrganizationBaseDN());
+  return dn;
+}
+
+function makeGroupEntryDN(...prefix) {
+  const dn = makeDN(...prefix, getGroupsBaseDN());
+  return dn;
+}
+
+function makeOrganizationUnitEntryDN(...prefix) {
+  const dn = makeDN(...prefix, getPeopleBaseDN());
+  return dn;
+}
+
+function makeOrganizationUnitEntry(dn, name, attrs = {}) {
+  // dn: d.dn,
+  // attributes: {
+  //   objectclass: ['organizationalUnit', 'top'],
+  //   ou: d.name,
+  // }
+  const generatedDN = makeOrganizationUnitEntryDN(dn);
+  const entry = {
+    dn: generatedDN,
+    attributes: Object.assign({
+      objectclass: ['organizationalUnit', 'top'],
+      ou: name,
+      entryDN: dn,
+    }, attrs),
+  };
+  return entry;
+}
+
+function makePersonEntry(dn, attrs) {
+  // u.ldap = {
+  //   dn: `mail=${mail}, ${depDN}`,
+  //   attributes: {
+  //     objectclass: ['inetOrgPerson', 'organizationalPerson', 'person', 'top'],
+  //     uid: u.userid,
+  //     title: u.position,
+  //     mobileTelephoneNumber: u.mobile,
+  //     cn: u.name,
+  //     givenName: u.name.substr(1),
+  //     sn: u.name.substr(0, 1),
+  //     mail,
+  //     userPassword: '123456',
+  //   }
+  // };
+  const generatedDN = makeOrganizationUnitEntryDN(dn);
+  const entry = {
+    dn: generatedDN,
+    attributes: Object.assign({
+      objectclass: ['inetOrgPerson', 'organizationalPerson', 'person', 'top'],
+      userPassword: '********',
+      // otpSecret: 'abcd',
+      memberOf: [],
+      entryDN: dn,
+    }, attrs)
+  };
+  return entry;
+}
+
+function makeGroupEntry(dn, name, members, attrs = {}) {
+    // dn: d.dn,
+  // attributes: {
+  //   objectclass: ['groupOfNames', 'top'],
+  //   ou: d.name,
+  // }
+  const generatedDN = makeGroupEntryDN(dn);
+  const entry = {
+    dn: generatedDN,
+    attributes: Object.assign({
+      objectclass: ['groupOfNames', 'top'],
+      cn: name,
+      ou: name,
+      member: members,
+      memberOf: [],
+      entryDN: dn,
+    }, attrs),
+  };
+  return entry;
+}
+
+function getOrganizationEntry() {
+  const entry = {
+    dn: getOrganizationBaseDN(),
+    attributes: {
+      objectclass: ['organization', 'top'],
+      ou: ldapConfig.organization,
+    },
+  };
+  return entry;
+}
+
+function getPeopleBaseEntry() {
+  const entry = {
+    dn: getPeopleBaseDN(),
+    attributes: {
+      objectclass: ['organizationalUnit', 'top'],
+      ou: 'People',
+    },
+  };
+  return entry;
+}
+
+function getGroupsBaseEntry() {
+  const entry = {
+    dn: getGroupsBaseDN(),
+    attributes: {
+      objectclass: ['organizationalUnit', 'top'],
+      ou: 'Groups',
+    },
+  };
+  return entry;
+}
+
+function makeAdminEntry(attrs) {
+  // {dn: 'cn=admin,'+rootDN, attributes: { objectclass: ['simpleSecurityObject', 'organizationalRole'], hasSubordinates: ['FALSE'] } },
+  const entry = {
+    dn: [ `cn=${attrs.commonName}`, getRootDN() ].join(','),
+    attributes: { objectclass: ['simpleSecurityObject', 'organizationalRole'],
+    hasSubordinates: ['FALSE'] },
+  };
+  return entry;
+}
+
+function getAdminEntries() {
+  return ldapConfig.admins.map(cfg => {
+    return makeAdminEntry(cfg);
+  });
+}
+
+function getBaseEntries() {
+  if (!cachedBaseEntries) {
+    const rootDN = getRootDN();
+    const rootEntry = {
+      dn: rootDN,
+      attributes: {
+        objectclass: ['dcObject', 'organization', 'top'],
+        dc: rootDN.split(',')[0].split('=')[1].trim(),
+        o: ldapConfig.organization,
+        hasSubordinates: ['TRUE'],
+      }
+    };
+
+    cachedBaseEntries = [
+      rootEntry,
+      getOrganizationEntry(),
+      getPeopleBaseEntry(),
+      getGroupsBaseEntry(),
+      ...getAdminEntries(),
+    ];
+  }
+
+  return cachedBaseEntries;
+}
+
+function validateAdminPassword(username, password) {
+  const [ user ] = ldapConfig.admins.filter(u => {
+    return u.commonName == username;
+  });
+  if (user && user.password === password) {
+    return true;
+  }
+
+  return false;
+}
+
+
+function validateAdminPermission(username, permission) {
+  const [ user ] = ldapConfig.admins.filter(u => {
+    return u.commonName == username;
+  });
+  if (user && user[permission]) {
+    return true;
+  }
+
+  return false;
+}
+
+function addMemberToGroup(memberEntry, groupEntry) {
+  if (groupEntry.attributes.member.indexOf(memberEntry.dn) < 0) {
+    groupEntry.attributes.member.push(memberEntry.dn);
+  }
+  if (memberEntry.attributes.memberOf.indexOf(groupEntry.dn) < 0) {
+    memberEntry.attributes.memberOf.push(groupEntry.dn);
+  }
+}
+
+
+module.exports = {
+  getRootDN,
+  getOrganizationBaseDN,
+  getAdminEntries,
+  getBaseEntries,
+  makeGroupEntry,
+  makeOrganizationUnitEntry,
+  makePersonEntry,
+  validateAdminPassword,
+  validateAdminPermission,
+  addMemberToGroup,
+};
diff --git a/lib/utilities/password.js b/lib/utilities/password.js
new file mode 100644
index 0000000..e88f90e
--- /dev/null
+++ b/lib/utilities/password.js
@@ -0,0 +1,45 @@
+const crypto = require('crypto');
+
+function validateUserPassword(secret, input) {
+  if (secret.substr(0, 9) === '{SSHA256}') {
+    secret = secret.substr(9);
+    const secbin = Buffer.from(secret, 'base64');
+    const userpw = secbin.subarray(0, secbin.length - 8).toString('hex');
+    const salt = secbin.subarray(secbin.length - 8);
+    const hash = crypto.createHash('sha256');
+    hash.update(input);
+    hash.update(salt);
+    const inputpw = hash.digest('hex');
+    // console.log('userpw', userpw);
+    // console.log('inputpw', inputpw);
+    return inputpw === userpw;
+
+  } else {
+    return secret === input;
+  }
+}
+
+function storeUserPassword(input) {
+  const hash = crypto.createHash('sha256');
+  hash.update(input);
+  const salt = Buffer.alloc(8);
+  for (let i = 0; i < 8; ++i) {
+    const b = Math.floor(Math.random() * 256);
+    // console.log('salt byte', i, b);
+    salt.writeUInt8(b, i);
+  }
+  // console.log('salt', salt.toString('hex'));
+  hash.update(salt);
+  const digest = hash.digest();
+  const hashbin = Buffer.concat([ digest, salt ]);
+  // console.log('pwhash', digest.toString('hex'));
+  digest.write(salt.toString('hex'), 'hex');
+  // console.log('pwhash /w salt', hashbin.toString('hex'));
+  const pw = '{SSHA256}' + hashbin.toString('base64');
+  return pw;
+}
+
+module.exports = {
+  validateUserPassword,
+  storeUserPassword,
+};
diff --git a/lib/utilities/provider.js b/lib/utilities/provider.js
new file mode 100644
index 0000000..2750148
--- /dev/null
+++ b/lib/utilities/provider.js
@@ -0,0 +1,39 @@
+const {
+  provider: providerConfig,
+} = require('../config');
+const log = require('log').get('provider');
+
+let provider = null;
+
+async function createProvider() {
+  if (!provider) {
+    const name = providerConfig.name;
+    log.info('Setting up provider', name);
+    provider = require('../providers/' + name);
+    await provider.setupProvider(providerConfig);
+    log.info('Done');
+  }
+
+  return provider;
+};
+
+function getProviderLDAPEntries() {
+  if (provider) {
+    return provider.getAllLDAPEntries();
+  }
+
+  return [];
+}
+
+function reloadEntriesFromProvider() {
+  if (provider) {
+    log.info('Reload entries from provider');
+    provider.reloadEntriesFromProvider();
+  }
+}
+
+module.exports = {
+  createProvider,
+  getProviderLDAPEntries,
+  reloadEntriesFromProvider,
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..21a4e0e
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,741 @@
+{
+  "name": "virtual-ldap",
+  "version": "0.1.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@otplib/core": {
+      "version": "12.0.1",
+      "resolved": "https://registry.npmjs.org/@otplib/core/-/core-12.0.1.tgz",
+      "integrity": "sha512-4sGntwbA/AC+SbPhbsziRiD+jNDdIzsZ3JUyfZwjtKyc/wufl1pnSIaG4Uqx8ymPagujub0o92kgBnB89cuAMA=="
+    },
+    "@otplib/plugin-crypto": {
+      "version": "12.0.1",
+      "resolved": "https://registry.npmjs.org/@otplib/plugin-crypto/-/plugin-crypto-12.0.1.tgz",
+      "integrity": "sha512-qPuhN3QrT7ZZLcLCyKOSNhuijUi9G5guMRVrxq63r9YNOxxQjPm59gVxLM+7xGnHnM6cimY57tuKsjK7y9LM1g==",
+      "requires": {
+        "@otplib/core": "^12.0.1"
+      }
+    },
+    "@otplib/plugin-thirty-two": {
+      "version": "12.0.1",
+      "resolved": "https://registry.npmjs.org/@otplib/plugin-thirty-two/-/plugin-thirty-two-12.0.1.tgz",
+      "integrity": "sha512-MtT+uqRso909UkbrrYpJ6XFjj9D+x2Py7KjTO9JDPhL0bJUYVu5kFP4TFZW4NFAywrAtFRxOVY261u0qwb93gA==",
+      "requires": {
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..9ab37bd
--- /dev/null
+++ b/package.json
@@ -0,0 +1,38 @@
+{
+  "name": "virtual-ldap",
+  "version": "0.1.0",
+  "author": {
+    "name": "ohdarling88",
+    "url": "https://xujiwei.com"
+  },
+  "main": "index.js",
+  "files": [
+    "index.js",
+    "lib/**/*.js",
+    "config.example.js"
+  ],
+  "keywords": [
+    "ldap",
+    "dingtalk",
+    "keycloak",
+    "钉钉",
+    "enterprise"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ohdarling/virtual-ldap"
+  },
+  "license": "MIT",
+  "scripts": {
+    "start": "LOG_TIME=abs LOG_LEVEL=info node index.js"
+  },
+  "dependencies": {
+    "axios": "^0.19.2",
+    "cron": "^1.8.2",
+    "ldapjs": "^1.0.2",
+    "log": "^6.0.0",
+    "log-node": "^7.0.0",
+    "mysql2": "^2.1.0",
+    "otplib": "^12.0.1"
+  }
+}
diff --git a/screenshots/1-create-connection.png b/screenshots/1-create-connection.png
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diff --git a/screenshots/2-base-auth.png b/screenshots/2-base-auth.png
new file mode 100644
index 0000000..1cca922
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diff --git a/screenshots/3-ldap-browse.png b/screenshots/3-ldap-browse.png
new file mode 100644
index 0000000..dde11ee
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