Add basic LDAP bind functionality

app/unit/LDAPServerUnit.js

@@ -10,6 +10,20 @@ class LDAPServerUnit extends Unit {
         return [...super.services, 'configs', 'express', 'output']
     }
 
+    auth_dn() {
+        return this.build_dn(this.config.schema.authentication_base)
+    }
+
+    anonymous() {
+        return LDAP.parseDN('cn=anonymous')
+    }
+
+    build_dn(...parts) {
+        parts = parts.flat()
+        parts.push(this.config.schema.base_dc)
+        return LDAP.parseDN(parts.join(','))
+    }
+
     async go(app) {
         this.config = this.configs.get('ldap:server')
         const server_config = {}
@@ -17,7 +31,7 @@ class LDAPServerUnit extends Unit {
         // If Flitter is configured to use an SSL certificate,
         // use it to enable LDAPS in the server.
         if ( this.express.use_ssl() ) {
-            this.output.info('[LDAP Server] Using configured SSL certificate to enable LDAPS.')
+            this.output.info('Using configured SSL certificate. The LDAP server will require an ldaps:// connection.')
             server_config.certificate = await this.express.ssl_certificate()
             server_config.key = await this.express.ssl_key()
         }
@@ -28,9 +42,10 @@ class LDAPServerUnit extends Unit {
             this.server.maxConnections = this.config.max_connections
         }
 
-        this.output.info(`[LDAP Server] Will listen on ${this.config.interface}:${this.config.port}`)
+        this.output.info(`Will listen on ${this.config.interface}:${this.config.port}`)
         await new Promise((res, rej) => {
             this.server.listen(this.config.port, this.config.interface, () => {
+                this.output.success(`LDAP server listening on port ${this.config.port}...`)
                 res()
             })
         })