feat(slack): send direct message

packages/backend/src/apps/slack/actions/send-a-direct-message/post-message.ts

@@ -0,0 +1,55 @@
+import { IGlobalVariable } from '@automatisch/types';
+import { URL } from 'url';
+
+type TData = {
+  channel: string;
+  text: string;
+  username?: string;
+  icon_url?: string;
+  icon_emoji?: string;
+};
+
+const postMessage = async ($: IGlobalVariable) => {
+  const { parameters } = $.step;
+  const toUsername = parameters.toUsername as string;
+  const text = parameters.message as string;
+  const sendAsBot = parameters.sendAsBot as boolean;
+  const botName = parameters.botName as string;
+  const botIcon = parameters.botIcon as string;
+
+  const data: TData = {
+    channel: toUsername,
+    text,
+  };
+
+  if (sendAsBot) {
+    data.username = botName;
+    try {
+      // challenging the input to check if it is a URL!
+      new URL(botIcon);
+      data.icon_url = botIcon;
+    } catch {
+      data.icon_emoji = botIcon;
+    }
+  }
+
+  const customConfig = {
+    sendAsBot,
+  };
+
+  const response = await $.http.post('/chat.postMessage', data, {
+    additionalProperties: customConfig,
+  });
+
+  if (response.data.ok === false) {
+    throw new Error(JSON.stringify(response.data));
+  }
+
+  const message = {
+    raw: response?.data,
+  };
+
+  $.setActionItem(message);
+};
+
+export default postMessage;