Fix parsing of displayName

Currently, we only have one field for the name. The first part is
first name. The rest is last name. Obviously, this won't work in all
cases but is the best we can do for the moment.

src/users.js

@@ -56,6 +56,8 @@ exports = module.exports = {
 
     resetSource,
 
+    parseDisplayName,
+
     AP_MAIL: 'mail',
     AP_WEBADMIN: 'webadmin',
 
@@ -981,3 +983,15 @@ async function setProfileConfig(profileConfig) {
 async function resetSource() {
     await database.query('UPDATE users SET source = ?', [ '' ]);
 }
+
+function parseDisplayName(displayName) {
+    assert.strictEqual(typeof displayName, 'string');
+
+    const middleName = '';
+    const idx = displayName.indexOf(' ');
+    if (idx === -1) return { firstName: displayName, lastName: '', middleName };
+
+    const firstName = displayName.substring(0, idx);
+    const lastName = displayName.substring(idx+1);
+    return { firstName, lastName, middleName };
+}