diff --git a/lib/userinfo.php b/lib/userinfo.php
new file mode 100644
index 0000000..7db54c5
--- /dev/null
+++ b/lib/userinfo.php
@@ -0,0 +1,122 @@
+<?php
+/**
+ * Get user info for the given username.
+ * @param int $u username
+ * @return [string] Array of [uid, username, name]
+ */
+function getUserByUsername($u) {
+    $client = new GuzzleHttp\Client();
+
+    $response = $client
+            ->request('POST', PORTAL_API, [
+        'form_params' => [
+            'key' => PORTAL_KEY,
+            'action' => "userinfo",
+            'username' => $u
+        ]
+    ]);
+
+    if ($response->getStatusCode() > 299) {
+        sendError("Login server error: " . $response->getBody());
+    }
+
+    $resp = json_decode($response->getBody(), TRUE);
+    if ($resp['status'] == "OK") {
+        return $resp['data'];
+    } else {
+        // this shouldn't happen, but in case it does just fake it.
+        return ["name" => $u, "username" => $u, "uid" => $u];
+    }
+}
+
+/**
+ * Get user info for the given UID.
+ * @param int $u user ID
+ * @return [string] Array of [uid, username, name]
+ */
+function getUserByID($u) {
+    $client = new GuzzleHttp\Client();
+
+    $response = $client
+            ->request('POST', PORTAL_API, [
+        'form_params' => [
+            'key' => PORTAL_KEY,
+            'action' => "userinfo",
+            'uid' => $u
+        ]
+    ]);
+
+    if ($response->getStatusCode() > 299) {
+        sendError("Login server error: " . $response->getBody());
+    }
+
+    $resp = json_decode($response->getBody(), TRUE);
+    if ($resp['status'] == "OK") {
+        return $resp['data'];
+    } else {
+        // this shouldn't happen, but in case it does just fake it.
+        return ["name" => $u, "username" => $u, "uid" => $u];
+    }
+}
+
+/**
+ * Check if the first UID is a manager of the second UID.
+ * @param int $m Manager UID
+ * @param int $e Employee UID
+ * @return boolean
+ */
+function isManagerOf($m, $e) {
+    $client = new GuzzleHttp\Client();
+
+    $response = $client
+            ->request('POST', PORTAL_API, [
+        'form_params' => [
+            'key' => PORTAL_KEY,
+            'action' => "ismanagerof",
+            'manager' => $m,
+            'employee' => $e,
+            'uid' => 1
+        ]
+    ]);
+
+    if ($response->getStatusCode() > 299) {
+        sendError("Login server error: " . $response->getBody());
+    }
+
+    $resp = json_decode($response->getBody(), TRUE);
+    if ($resp['status'] == "OK") {
+        return $resp['managerof'];
+    } else {
+        // this shouldn't happen, but in case it does just fake it.
+        return ["name" => $u, "username" => $u, "uid" => $u];
+    }
+}
+
+/**
+ * Get an array of UIDs the given UID is a manager of.
+ * @param int $manageruid The UID of the manager to find employees for.
+ * @return [int]
+ */
+function getManagedUIDs($manageruid) {
+    $client = new GuzzleHttp\Client();
+
+    $response = $client
+            ->request('POST', PORTAL_API, [
+        'form_params' => [
+            'key' => PORTAL_KEY,
+            'action' => "getmanaged",
+            'uid' => $manageruid
+        ]
+    ]);
+
+    if ($response->getStatusCode() > 299) {
+        sendError("Login server error: " . $response->getBody());
+    }
+
+    $resp = json_decode($response->getBody(), TRUE);
+    if ($resp['status'] == "OK") {
+        return $resp['employees'];
+    } else {
+        return [];
+    }
+}
\ No newline at end of file