Hand LDAP config to policy from main policy file

Deployments will differ in production. The policy itself just needs the
configs, but should not care where credentials are fetched from.

extras/strfry/strfry-policy.ts

@@ -8,15 +8,25 @@ import {
   readStdin,
   writeStdout,
 } from 'https://gitlab.com/soapbox-pub/strfry-policies/-/raw/develop/mod.ts';
-
 import ldapPolicy from './ldap-policy.ts';
+import { load } from "https://deno.land/std@0.224.0/dotenv/mod.ts";
+
+const dirname = new URL('.', import.meta.url).pathname;
+await load({ envPath: `${dirname}/.env`, export: true });
+
+const ldapConfig = {
+  url: Deno.env.get("LDAP_URL"),
+  bindDN: Deno.env.get("LDAP_BIND_DN"),
+  password: Deno.env.get("LDAP_PASSWORD"),
+  searchDN: Deno.env.get("LDAP_SEARCH_DN"),
+}
 
 for await (const msg of readStdin()) {
   const result = await pipeline(msg, [
     [hellthreadPolicy, { limit: 10 }],
     [antiDuplicationPolicy, { ttl: 60000, minLength: 50 }],
     [rateLimitPolicy, { whitelist: ['127.0.0.1'] }],
-    [ldapPolicy],
+    [ldapPolicy, ldapConfig],
   ]);
 
   writeStdout(result);