From d9f9198b45545296cec68260688d85d3d2f49bb3 Mon Sep 17 00:00:00 2001
From: Marco <marco@delight.im>
Date: Sat, 10 Mar 2018 03:03:57 +0100
Subject: [PATCH] Implement method 'getRolesForUserById' in class
 'Administration'

---
 src/Administration.php | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/src/Administration.php b/src/Administration.php
index 561ad46..2e85afe 100644
--- a/src/Administration.php
+++ b/src/Administration.php
@@ -286,6 +286,36 @@ final class Administration extends UserManager {
 		return ($rolesBitmask & $role) === $role;
 	}
 
+	/**
+	 * Returns the roles of the user with the given ID, mapping the numerical values to their descriptive names
+	 *
+	 * @param int $userId the ID of the user to return the roles for
+	 * @return array
+	 * @throws UnknownIdException if no user with the specified ID has been found
+	 *
+	 * @see Role
+	 */
+	public function getRolesForUserById($userId) {
+		$userId = (int) $userId;
+
+		$rolesBitmask = $this->db->selectValue(
+			'SELECT roles_mask FROM ' . $this->dbTablePrefix . 'users WHERE id = ?',
+			[ $userId ]
+		);
+
+		if ($rolesBitmask === null) {
+			throw new UnknownIdException();
+		}
+
+		return \array_filter(
+			Role::getMap(),
+			function ($each) use ($rolesBitmask) {
+				return ($rolesBitmask & $each) === $each;
+			},
+			\ARRAY_FILTER_USE_KEY
+		);
+	}
+
 	/**
 	 * Signs in as the user with the specified ID
 	 *