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/ldap-policy.ts

@@ -1,22 +1,22 @@
 import type { Policy } from 'https://gitlab.com/soapbox-pub/strfry-policies/-/raw/develop/mod.ts';
 import { Client } from 'npm:ldapts';
-import { load } from "https://deno.land/std@0.224.0/dotenv/mod.ts";
 
-const env      = await load({ export: true });
+interface LdapConfig {
-const url      = Deno.env.get("LDAP_URL");
+  url: string;
-const bindDN   = Deno.env.get("LDAP_BIND_DN");
+  bindDN: string;
-const password = Deno.env.get("LDAP_PASSWORD");
+  password: string;
-const searchDN = Deno.env.get("LDAP_SEARCH_DN");
+  searchDN: string;
+}
 
-const ldapPolicy: Policy<void> = async (msg) => {
+const ldapPolicy: Policy<LdapConfig> = async (msg, opts) => {
-  const client = new Client({ url });
+  const client = new Client({ url: opts.url });
   const { pubkey, kind, tags } = msg.event;
   let out = { id: msg.event.id }
 
   try {
-    await client.bind(bindDN, password);
+    await client.bind(opts.bindDN, opts.password);
 
-    const { searchEntries } = await client.search(searchDN, {
+    const { searchEntries } = await client.search(opts.searchDN, {
       filter: `(nostrKey=${pubkey})`,
       attributes: ['nostrKey']
     });

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);