extend ILDAPProvider to allow reading arbitrairy ldap attributes for users

Signed-off-by: Robin Appelman <robin@icewind.nl>

apps/user_ldap/lib/LDAPProvider.php

@@ -42,7 +42,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 	private $logger;
 	private $helper;
 	private $deletedUsersIndex;
-	
+
 	/**
 	 * Create new LDAPProvider
 	 * @param \OCP\IServerContainer $serverContainer
@@ -77,7 +77,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 			throw new \Exception('To use the LDAPProvider, user_ldap app must be enabled');
 		}
 	}
-	
+
 	/**
 	 * Translate an user id to LDAP DN
 	 * @param string $uid user id
@@ -126,7 +126,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 		}
 		return $result;
 	}
-	
+
 	/**
 	 * Convert a stored DN so it can be used as base parameter for LDAP queries.
 	 * @param string $dn the DN in question
@@ -135,7 +135,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 	public function DNasBaseParameter($dn) {
 		return $this->helper->DNasBaseParameter($dn);
 	}
-	
+
 	/**
 	 * Sanitize a DN received from the LDAP server.
 	 * @param array $dn the DN in question
@@ -144,7 +144,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 	public function sanitizeDN($dn) {
 		return $this->helper->sanitizeDN($dn);
 	}
-	
+
 	/**
 	 * Return a new LDAP connection resource for the specified user.
 	 * The connection must be closed manually.
@@ -172,7 +172,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 		}
 		return $this->groupBackend->getNewLDAPConnection($gid);
 	}
-	
+
 	/**
 	 * Get the LDAP base for users.
 	 * @param string $uid user id
@@ -202,7 +202,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 		);
 		return array_shift($bases);
 	}
-	
+
 	/**
 	 * Get the LDAP base for groups.
 	 * @param string $uid user id
@@ -216,7 +216,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 		$bases = $this->userBackend->getLDAPAccess($uid)->getConnection()->ldapBaseGroups;
 		return array_shift($bases);
 	}
-	
+
 	/**
 	 * Clear the cache if a cache is used, otherwise do nothing.
 	 * @param string $uid user id
@@ -241,7 +241,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 		}
 		$this->groupBackend->getLDAPAccess($gid)->getConnection()->clearCache();
 	}
-	
+
 	/**
 	 * Check whether a LDAP DN exists
 	 * @param string $dn LDAP DN
@@ -251,7 +251,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 		$result = $this->userBackend->dn2UserName($dn);
 		return !$result ? false : true;
 	}
-	
+
 	/**
 	 * Flag record for deletion.
 	 * @param string $uid user id
@@ -259,7 +259,7 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 	public function flagRecord($uid) {
 		$this->deletedUsersIndex->markUser($uid);
 	}
-	
+
 	/**
 	 * Unflag record for deletion.
 	 * @param string $uid user id
@@ -306,4 +306,35 @@ class LDAPProvider implements ILDAPProvider, IDeletionFlagSupport {
 		}
 		return $this->groupBackend->getLDAPAccess($gid)->getConnection()->getConfiguration()['ldap_group_member_assoc_attribute'];
 	}
+
+	/**
+	 * Get an LDAP attribute for a nextcloud user
+	 * @param string $uid the nextcloud user id to get the attribute for
+	 * @param string $attribute the name of the attribute to read
+	 * @return string|null
+	 * @throws \Exception if user id was not found in LDAP
+	 */
+	public function getUserAttribute(string $uid, string $attribute): ?string {
+		if (!$this->userBackend->userExists($uid)) {
+			throw new \Exception('User id not found in LDAP');
+		}
+		$access = $this->userBackend->getLDAPAccess($uid);
+		$connection = $access->getConnection();
+		$key = $uid . "::" . $attribute;
+		$cached = $connection->getFromCache($key);
+
+		if ($cached !== null) {
+			return $cached;
+		}
+
+		$value = $access->readAttribute($access->username2dn($uid), $attribute);
+		if (is_array($value) && count($value) > 0) {
+			$value = current($value);
+		} else {
+			return null;
+		}
+		$connection->writeToCache($key, $value);
+
+		return $value;
+	}
 }

lib/public/LDAP/ILDAPProvider.php

@@ -58,7 +58,7 @@ interface ILDAPProvider {
 	 * @since 11.0.0
 	 */
 	public function getUserName($dn);
-	
+
 	/**
 	 * Convert a stored DN so it can be used as base parameter for LDAP queries.
 	 * @param string $dn the DN
@@ -66,7 +66,7 @@ interface ILDAPProvider {
 	 * @since 11.0.0
 	 */
 	public function DNasBaseParameter($dn);
-	
+
 	/**
 	 * Sanitize a DN received from the LDAP server.
 	 * @param array $dn the DN in question
@@ -74,7 +74,7 @@ interface ILDAPProvider {
 	 * @since 11.0.0
 	 */
 	public function sanitizeDN($dn);
-	
+
 	/**
 	 * Return a new LDAP connection resource for the specified user.
 	 * @param string $uid user id
@@ -90,7 +90,7 @@ interface ILDAPProvider {
 	 * @since 13.0.0
 	 */
 	public function getGroupLDAPConnection($gid);
-	
+
 	/**
 	 * Get the LDAP base for users.
 	 * @param string $uid user id
@@ -99,7 +99,7 @@ interface ILDAPProvider {
 	 * @since 11.0.0
 	 */
 	public function getLDAPBaseUsers($uid);
-	
+
 	/**
 	 * Get the LDAP base for groups.
 	 * @param string $uid user id
@@ -108,7 +108,7 @@ interface ILDAPProvider {
 	 * @since 11.0.0
 	 */
 	public function getLDAPBaseGroups($uid);
-	
+
 	/**
 	 * Check whether a LDAP DN exists
 	 * @param string $dn LDAP DN
@@ -116,7 +116,7 @@ interface ILDAPProvider {
 	 * @since 11.0.0
 	 */
 	public function dnExists($dn);
-	
+
 	/**
 	 * Clear the cache if a cache is used, otherwise do nothing.
 	 * @param string $uid user id
@@ -157,4 +157,14 @@ interface ILDAPProvider {
 	 * @since 13.0.0
 	 */
 	public function getLDAPGroupMemberAssoc($gid);
+
+	/**
+	 * Get an LDAP attribute for a nextcloud user
+	 * @param string $uid the nextcloud user id to get the attribute for
+	 * @param string $attribute the name of the attribute to read
+	 * @return string|null
+	 * @throws \Exception if user id was not found in LDAP
+	 * @since 22.0.0
+	 */
+	public function getUserAttribute(string $uid, string $attribute): ?string;
 }