captainzmc commented on a change in pull request #236: [LIVY-678] Thrift ldap 
authentication, based on ldapurl, basedn, domain
URL: https://github.com/apache/incubator-livy/pull/236#discussion_r333424915
 
 

 ##########
 File path: 
thriftserver/server/src/main/scala/org/apache/livy/thriftserver/auth/ldap/LdapUtils.scala
 ##########
 @@ -0,0 +1,124 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.livy.thriftserver.auth.ldap
+
+import org.apache.commons.lang.StringUtils
+
+import org.apache.livy.{LivyConf, Logging}
+
+/**
+  * Static utility methods related to LDAP authentication module.
+  */
+object LdapUtils extends Logging{
+
+  /**
+    * Extracts username from user DN.
+    * <br>
+    * <b>Examples:</b>
+    * <pre>
+    * LdapUtils.extractUserName("UserName")                        = "UserName"
+    * LdapUtils.extractUserName("usern...@mycorp.com")             = "UserName"
+    * LdapUtils.extractUserName("cn=UserName,dc=mycompany,dc=com") = "UserName"
+    * </pre>
+    *
+    * @param userDn
+    * @return
+    */
+  def extractUserName(userDn: String): String = {
+    if (!isDn(userDn) && !hasDomain(userDn)) return userDn
+    val domainIdx = indexOfDomainMatch(userDn)
+    if (domainIdx > 0) return userDn.substring(0, domainIdx)
+    if (userDn.contains("=")) return userDn.substring(userDn.indexOf("=") + 1, 
userDn.indexOf(","))
+    userDn
+  }
+
+  /**
+    * Get the index separating the user name from domain name (the user's name 
up
+    * to the first '/' or '@').
+    *
+    * @param userName full user name.
+    * @return index of domain match or -1 if not found
+    */
+  def indexOfDomainMatch(userName: String): Int = {
+    if (userName == null) return -1
+    val idx = userName.indexOf('/')
+    val idx2 = userName.indexOf('@')
+    var endIdx = Math.min(idx, idx2) // Use the earlier match.
+    // Unless at least one of '/' or '@' was not found, in
+    // which case, user the latter match.
+    if (endIdx == -1) endIdx = Math.max(idx, idx2)
+    endIdx
+  }
+
+  /**
+    * Check for a domain part in the provided username.
+    * <br>
+    * <b>Example:</b>
+    * <br>
+    * <pre>
+    * LdapUtils.hasDomain("us...@mycorp.com") = true
+    * LdapUtils.hasDomain("user1")            = false
+    * </pre>
+    *
+    * @param userName username
+    * @return true if { @code userName} contains { @code @<domain>} part
+    */
+  def hasDomain(userName: String): Boolean = {
+    indexOfDomainMatch(userName) > 0
+  }
+
+  /**
+    * Detects DN names.
+    * <br>
+    * <b>Example:</b>
+    * <br>
+    * <pre>
+    * LdapUtils.isDn("cn=UserName,dc=mycompany,dc=com") = true
+    * LdapUtils.isDn("user1")                           = false
+    * </pre>
+    *
+    * @param name name to be checked
+    * @return true if the provided name is a distinguished name
+    */
+  def isDn(name: String): Boolean = {
 
 Review comment:
   This format may not be recommended

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