Add read-only policy

read-only-policy.ts

@@ -0,0 +1,39 @@
+#!/bin/sh
+//bin/true; exec deno run -A "$0" "$@"
+import { readLines } from 'https://deno.land/std@0.178.0/io/mod.ts';
+
+interface InputMessage {
+  type: 'new' | 'lookback';
+  event: Event;
+  receivedAt: number;
+  sourceType: 'IP4' | 'IP6' | 'Import' | 'Stream' | 'Sync';
+  sourceInfo: string;
+}
+
+interface OutputMessage {
+  id: string;
+  action: 'accept' | 'reject' | 'shadowReject';
+  msg: string;
+}
+
+interface Event {
+  id: string;
+  sig: string;
+  kind: number;
+  tags: string[][];
+  pubkey: string;
+  content: string;
+  created_at: number;
+}
+
+function handleMessage(msg: InputMessage): OutputMessage {
+  return {
+    id: msg.event.id,
+    action: 'reject',
+    msg: 'The relay is set to read-only.',
+  };
+}
+
+for await (const line of readLines(Deno.stdin)) {
+  console.log(JSON.stringify(handleMessage(JSON.parse(line))));
+}