LDAP用户分页读取

playedu-common/src/main/java/xyz/playedu/common/bus/LDAPBus.java

@@ -33,6 +33,7 @@ import xyz.playedu.common.util.ldap.LdapTransformDepartment;
 import xyz.playedu.common.util.ldap.LdapTransformUser;
 import xyz.playedu.common.util.ldap.LdapUtil;
 
+import java.io.IOException;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -162,7 +163,7 @@ public class LDAPBus {
         }
     }
 
-    public void userSync() throws NamingException {
+    public void userSync() throws NamingException, IOException {
         LdapConfig ldapConfig = appConfigService.ldapConfig();
 
         List<LdapTransformUser> userList =

playedu-common/src/main/java/xyz/playedu/common/util/ldap/LdapUtil.java

@@ -20,6 +20,7 @@ import lombok.extern.slf4j.Slf4j;
 import xyz.playedu.common.exception.ServiceException;
 import xyz.playedu.common.util.StringUtil;
 
+import java.io.IOException;
 import java.util.*;
 
 import javax.naming.Context;
@@ -29,8 +30,7 @@ import javax.naming.directory.Attribute;
 import javax.naming.directory.Attributes;
 import javax.naming.directory.SearchControls;
 import javax.naming.directory.SearchResult;
-import javax.naming.ldap.InitialLdapContext;
+import javax.naming.ldap.*;
-import javax.naming.ldap.LdapContext;
 
 @Slf4j
 public class LdapUtil {
@@ -41,7 +41,7 @@ public class LdapUtil {
             "(|(objectClass=person)(objectClass=posixAccount)(objectClass=inetOrgPerson)(objectClass=organizationalPerson)(objectClass=user))";
 
     private static final String[] USER_RETURN_ATTRS =
-            new String[] {
+            new String[]{
                     // OpenLDAP 的属性
                     "uid", // 用户的唯一识别符号，全局唯一，可以看做用户表的手机号，此字段可用于配合密码直接登录
                     "cn", // CommonName -> 可以认作为人的名字，比如：张三。在LDAP中此字段是可以重复的,但是同一ou下不可重复
@@ -59,7 +59,7 @@ public class LdapUtil {
                     // 公用属性
                     "mail",
             };
-    private static final String[] OU_RETURN_ATTRS = new String[] {"ou", "usncreated"};
+    private static final String[] OU_RETURN_ATTRS = new String[]{"ou", "usncreated"};
 
     public static LdapContext initContext(String url, String adminUser, String adminPass)
             throws NamingException {
@@ -75,39 +75,69 @@ public class LdapUtil {
     }
 
     public static List<LdapTransformUser> users(
-            String url, String adminUser, String adminPass, String baseDN) throws NamingException {
+            String url, String adminUser, String adminPass, String baseDN) throws NamingException, IOException {
         LdapContext ldapContext = initContext(url, adminUser, adminPass);
 
+        int pageSize = 1000;
+        List<LdapTransformUser> users = new ArrayList<>();
+
         SearchControls controls = new SearchControls();
         controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
         controls.setReturningAttributes(USER_RETURN_ATTRS);
         controls.setReturningObjFlag(true);
 
-        NamingEnumeration<SearchResult> result = null;
+        byte[] cookie = null;
+
+        while (true) {
             try {
-            result = ldapContext.search(baseDN, USER_OBJECT_CLASS, controls);
+                if (cookie != null) {
-        } catch (NamingException e) {
+                    ldapContext.setRequestControls(new Control[]{
-            log.error("LDAP用户查询失败", e);
+                            new PagedResultsControl(pageSize, cookie, false),
-        } finally {
+                    });
-            closeContext(ldapContext);
+                } else {
+                    ldapContext.setRequestControls(new Control[]{
+                            new PagedResultsControl(pageSize, false)
+                    });
                 }
 
-        if (result == null || !result.hasMoreElements()) {
+                NamingEnumeration<SearchResult> result = ldapContext.search(baseDN, USER_OBJECT_CLASS, controls);
+                while (result.hasMoreElements()) {
+                    SearchResult item = result.nextElement();
+                    if (item != null) {
+                        LdapTransformUser ldapTransformUser = parseTransformUser(item, baseDN);
+                        users.add(ldapTransformUser);
+                    }
+                }
+
+                cookie = parseCookie(ldapContext.getResponseControls());
+                if (cookie == null || cookie.length == 0) {
+                    break;
+                }
+            } catch (NamingException e) {
+                log.error("LDAP用户查询失败", e);
+                break;
+            }
+        }
+
+        closeContext(ldapContext);
+
+        if (users.isEmpty()) {
             log.info("LDAP服务中没有用户");
             return null;
         }
 
-        List<LdapTransformUser> users = new ArrayList<>();
+        return users;
-        while (result.hasMoreElements()) {
-            SearchResult item = result.nextElement();
-            if (item == null) {
-                continue;
-            }
-            LdapTransformUser ldapTransformUser = parseTransformUser(item, baseDN);
-            users.add(ldapTransformUser);
     }
 
-        return users;
+    private static byte[] parseCookie(Control[] controls) throws NamingException {
+        if (controls != null) {
+            for (Control control : controls) {
+                if (control instanceof PagedResultsResponseControl) {
+                    return ((PagedResultsResponseControl) control).getCookie();
+                }
+            }
+        }
+        return null;
     }
 
     public static List<LdapTransformDepartment> departments(