node-red-contrib-chatbot/nodes/chatbot-authorized.html

REDBot a Chat bot for a full featured chat bot for Telegram, Facebook Messenger and Slack. Almost no coding skills required

<script type="text/javascript">
  $.RedBot.registerType('chatbot-authorized', {
    category: $.RedBot.config.name + ' Flow',
    color: '#FFCC66',
    defaults: {
    },
    inputs: 1,
    outputs: 2,
    paletteLabel: 'Authorized',
    icon: 'chatbot-authorized.png',
    label: function() {
      return 'Authorized?';
    }
  });
</script>

<script type="text/x-red" data-help-name="chatbot-authorized"><p>Check if the current chat is authorized, in that case, the message will be forwarded to the first output, otherwise the second output.</p>
<p><img src="https://s3.us-west-2.amazonaws.com/secure.notion-static.com/8f24f336-2ebf-48bb-86b5-b5e6af17e145/example-authorized.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIAT73L2G45EIPT3X45%2F20230218%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20230218T124909Z&X-Amz-Expires=3600&X-Amz-Signature=40e6f451c73e0e85e07fde7586412b68263381fdf86788bad05ede8ae218a3fb&X-Amz-SignedHeaders=host&x-id=GetObject" alt="Authorized node"></p>
<p>The authorization scheme is very simple: a flag <code>authorized</code> in the <a href="https://www.notion.so/3460c588cf234344974936acd05f8c16">Chat Context</a>  is set if the <em>chatId</em> is included in a whitelist defined in the bot configuration. All messages will go out of the receiver node, no matter if the user is authorized or not, it just affects the <code>authorized</code> flag.</p>
<p>For example, the same check can be obtained with a <a href="https://www.notion.so/4113636f565d4ff4af08bc61a644206b">Rules node</a>  or a <code>Function node</code></p>
<pre><code class="language-javascript">const chat = msg.chat();Promise.resolve(chat.get(&#39;authorized&#39;))  .then(authorized =&gt; {    node.send(authorized ? [msg, null] : [null, msg]);  });
</code></pre>
<p>In order to obtain a custom authorization scheme, use the <a href="https://www.notion.so/04668c7a415547bc9f34be57dd063db2">Extend node</a> , for example</p>
<pre><code class="language-javascript">// this middleware will be execute before any &#39;in&#39; middleware
node.chat.use(function(message) {  
  const chat = message.chat();  
  // always return a promise, this ensure it&#39;s a promise even if using the  
  // sync memory context  
  return Promise.resolve(chat.get(&#39;chatId&#39;))    
    .then(chatId =&gt; Promise.resolve(myAuthScheme(chatId)))    
    .then(authorized =&gt; Promise.resolve(chat.set(&#39;authorized&#39;, authorized)));
});
</code></pre>
<p>In that case the custom function <code>myAuthScheme</code> can also be an asynchronous call to an external service.</p>
</script>