eventlog: always use AuditSource objects as source field

src/auditsource.js

@@ -2,7 +2,7 @@
 
 class AuditSource {
     constructor(username, userId, ip) {
-        this.username = username;
+        this.username = username || null; // this can be a real user or a module like cron/apptask/platform
         this.userId = userId || null;
         this.ip = ip || null;
     }
@@ -11,14 +11,26 @@ class AuditSource {
         const ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress || null;
         return new AuditSource(req.user?.username, req.user?.id, ip);
     }
+
+    static fromDirectoryServerRequest(req) {
+        const ip = req.connection.ldap.id; // also contains the port
+        return new AuditSource('directoryserver', null, ip);
+    }
+
+    static fromOidcRequest(req) {
+        const ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress || null;
+        return new AuditSource('oidc', req.body?.username, ip);
+    }
 }
 
 // these can be static variables but see https://stackoverflow.com/questions/60046847/eslint-does-not-allow-static-class-properties#comment122122927_60464446
 AuditSource.APPTASK = new AuditSource('apptask');
+AuditSource.BOOT = new AuditSource('boot');
 AuditSource.CRON =  new AuditSource('cron');
-AuditSource.EXTERNAL_LDAP_TASK = new AuditSource('externalldap');
-AuditSource.EXTERNAL_LDAP_AUTO_CREATE = new AuditSource('externalldap');
+AuditSource.EXTERNAL_LDAP = new AuditSource('externalldap');
 AuditSource.HEALTH_MONITOR = new AuditSource('healthmonitor');
+AuditSource.LDAP = new AuditSource('ldap');
+AuditSource.MAIL = new AuditSource('mail');
 AuditSource.PLATFORM = new AuditSource('platform');
 
 exports = module.exports = AuditSource;