mgaido91 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_r334232925
 
 

 ##########
 File path: 
thriftserver/server/src/main/scala/org/apache/livy/thriftserver/auth/ldap/LdapUtils.scala
 ##########
 @@ -0,0 +1,115 @@
+/*
+ * 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.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>
+   */
+  def extractUserName(userDn: String): String = {
+    var userName = userDn
+
+    if (!isDn(userDn) && !hasDomain(userDn)) {
+      userName = userDn
+    } else {
+      val domainIdx = indexOfDomainMatch(userDn)
+      if (domainIdx > 0) {
+        userName = userDn.substring(0, domainIdx)
+      } else if (userDn.contains("=")) {
+        userName = userDn.substring(userDn.indexOf("=") + 1, 
userDn.indexOf(","))
+      }
+    }
+    userName
+  }
+
+  /**
+   * Get the index separating the user name from domain name (the user's name 
up
+   * to the first '/' or '@'). Index of domain match or -1 if not found
+   */
+  def indexOfDomainMatch(userName: String): Int = {
+    var endIdx = -1
+    val idx = userName.indexOf('/')
+    val idx2 = userName.indexOf('@')
+    endIdx = Math.min(idx, idx2)
+
+    // If neither '/' nor '@' was found, using the latter
+    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>
+   */
+  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>
+   */
+  def isDn(name: String): Boolean = {
+    name.contains("=")
+  }
+
+  /**
+   * Creates a principal to be used for user authentication.
+   */
+  def createCandidatePrincipal(conf: LivyConf, user: String): String = {
+    val ldapDomain = conf.get(LivyConf.THRIFT_LDAP_AUTHENTICATION_DOMAIN)
+    val ldapBaseDN = conf.get(LivyConf.THRIFT_LDAP_AUTHENTICATION_BASEDN)
+
+    var principle = user
 
 Review comment:
   this can be a val

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