Add a Generic Webhook / HTTP Adapter for Arbitrary Chat Platforms

[mitdave95]

Problem Statement

Many popular or emerging messaging channels do not yet have dedicated adapters in the SDK. Like -

1. WhatsApp (via open-source HTTP bridges such as WAHA or Beeper)
2. Meta Ray-Ban smart glasses (which surface conversations through Meta/WhatsApp channels)
3. Telegram (via its webhook-capable Bot API)
4. Matrix / Element
5. Various self-hosted, enterprise, or niche messengers
6. Any future or custom platform that supports inbound HTTP webhooks and can receive responses via HTTP POST

Without a generic mechanism, supporting these platforms requires either waiting for official adapter packages or forking/maintaining custom platform-specific integrations — which undermines the "write once, run anywhere" value proposition of the SDK.

Proposed Solution

Introduce a built-in generic webhook / HTTP adapter (or a lightweight "raw HTTP" adapter) in the core Chat SDK or as a first-party package (e.g., @chat-adapter/webhook or @chat-adapter/generic).
This adapter would allow developers to connect the same bot logic to any HTTP-capable platform by defining:

1. How incoming HTTP payloads are parsed and mapped to Chat SDK events (e.g., extracting message text, sender ID, channel/thread info)
2. How outgoing Chat SDK responses are transformed and sent back (e.g., via HTTP POST, specific JSON shape, headers, etc.)

Alternatives Considered

No response

Use Case

import { Chat } from "chat";
import { createGenericAdapter } from "@chat-adapter/generic";  // or built-in

const bot = new Chat({
  userName: "mybot",
  adapters: {
    custom: createGenericAdapter({
      // Core webhook handling
      path: "/webhook/my-platform",               // Vercel / server route
      verification: {
        secret: process.env.WEBHOOK_SECRET,       // optional HMAC / token check
      },

      // Required mappings (examples)
      incoming: {
        getText: (payload) => payload?.message?.text || payload?.body,
        getSenderId: (payload) => payload?.from?.id || payload?.sender,
        getChannelId: (payload) => payload?.thread?.id || payload?.chatId,
        // Optional: getMessageId, isFromBot, etc.
      },

      outgoing: async (channelId, content, options) => {
        // Developer provides the send logic (fetch/axios/etc.)
        await fetch("https://api.platform.com/messages", {
          method: "POST",
          headers: { Authorization: `Bearer ${process.env.PLATFORM_TOKEN}` },
          body: JSON.stringify({
            chat_id: channelId,
            text: content.text,
            // ... platform-specific fields
          }),
        });
      },

      // Optional extras
      platformName: "WhatsApp",                     // for logs/metrics
      shouldHandle: (req) => req.headers["user-agent"]?.includes("WhatsApp"), // filter
    }),
  },
  // ... other config (state, model, etc.)
});

Priority

Nice to have

Contribution

• I am willing to help implement this feature

Additional Context

No response