Add noop and hellthread policies

.vscode/extensions.json

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+{
+  "recommendations": [
+    "denoland.vscode-deno"
+  ]
+}

.vscode/settings.json

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+{
+  "deno.enable": true,
+  "path-intellisense.extensionOnImport": true
+}

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

README.md

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+# strfry policies
+
+A collection of policies for the [strfry](https://github.com/hoytech/strfry) relay, written in Deno.
+
+For more information about installing these policies and how they work, see [Write policy plugins](https://github.com/hoytech/strfry/blob/master/docs/plugins.md).
+
+## License
+
+This is free and unencumbered software released into the public domain.

deno.json

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+{
+  "lock": false,
+  "tasks": {
+  },
+  "lint": {
+    "files": {
+      "include": ["."]
+    },
+    "rules": {
+      "tags": ["recommended"],
+      "exclude": ["no-explicit-any"]
+    }
+  },
+  "fmt": {
+    "files": {
+      "include": ["."]
+    },
+    "options": {
+      "useTabs": false,
+      "lineWidth": 120,
+      "indentWidth": 2,
+      "semiColons": true,
+      "singleQuote": true,
+      "proseWrap": "preserve"
+    }
+  }
+}

hellthread-policy.ts

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+#!/usr/bin/env -S deno run
+import { readLines } from 'https://deno.land/std@0.178.0/io/mod.ts';
+
+const HELLTHREAD_LIMIT = Number(Deno.env.get('HELLTHREAD_LIMIT') || 20);
+
+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 {
+  const p = msg.event.tags.filter((tag) => tag[0] === 'p');
+
+  if (p.length > HELLTHREAD_LIMIT) {
+    return {
+      id: msg.event.id,
+      action: 'reject',
+      msg: `Event rejected due to ${p.length} "p" tags (${HELLTHREAD_LIMIT} is the limit).`,
+    };
+  } else {
+    return {
+      id: msg.event.id,
+      action: 'accept',
+      msg: '',
+    };
+  }
+}
+
+for await (const line of readLines(Deno.stdin)) {
+  console.log(JSON.stringify(handleMessage(JSON.parse(line))));
+}

noop-policy.ts

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+#!/usr/bin/env -S deno run
+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: 'accept',
+    msg: '',
+  };
+}
+
+for await (const line of readLines(Deno.stdin)) {
+  console.log(JSON.stringify(handleMessage(JSON.parse(line))));
+}