beckn-lightweight/handlers/handleSearch.js

Lightweight Node.js utilities to integrate Beckn protocol into existing BPPs

const axios = require("axios");
const { sendAck } = require("../utils/ackResponse");
const { postCallback } = require("../utils/postCallback");

function createForwardingHandler({ messageKey, callbackAction }) {
return function (customLogicFn = null) {
return async (req, res) => {
const context = req.body.context;
const payload = req.body.message?.[messageKey];

  console.log("Received /search request. Sending ACK...");
  // 2. Send ACK
  sendAck(res);

  try {
    let bppResponse = null;

if (customLogicFn) {
  bppResponse = await customLogicFn(payload, context);
}

// Use bppResponse if available
if (!bppResponse) {
  // 4. Forward request to actual BPP
  const bppUri = context.bpp_uri;
  if (!bppUri) throw new Error("Missing bpp_uri in context");

  const forwardUrl = `${bppUri}/${context.action}`;
  const response = await axios.post(forwardUrl, req.body, {
    headers: { "Content-Type": "application/json" },
  });
  bppResponse = response.data;
}

// 5. Post response to BAP /on_* endpoint
    await postCallback(callbackAction, context, bppResponse);
  } catch (err) {
    console.error(`${callbackAction} forwarding error:`, err.message);
  }
};
};
}

// Export handlers
module.exports = {
handleSearch: createForwardingHandler({ messageKey: "intent", callbackAction: "on_search" }),
handleSelect: createForwardingHandler({ messageKey: "order", callbackAction: "on_select" }),
handleInit: createForwardingHandler({ messageKey: "order", callbackAction: "on_init" }),
handleConfirm: createForwardingHandler({ messageKey: "order", callbackAction: "on_confirm" }),
handleStatus: createForwardingHandler({ messageKey: "order_id", callbackAction: "on_status" }),
handleTrack: createForwardingHandler({ messageKey: "order_id", callbackAction: "on_track" }),
handleCancel: createForwardingHandler({ messageKey: "order", callbackAction: "on_cancel" }),
handleSupport: createForwardingHandler({ messageKey: "ref_id", callbackAction: "on_support" }),
handleRating: createForwardingHandler({ messageKey: "id", callbackAction: "on_rating" }),
handleFeedback: createForwardingHandler({ messageKey: "feedback_form", callbackAction: "on_feedback" }),
handleUpdate: createForwardingHandler({ messageKey: "order", callbackAction: "on_update" }),
handleIssue: createForwardingHandler({ messageKey: "issue", callbackAction: "on_issue" }),
handleIssueStatus: createForwardingHandler({ messageKey: "issue_id", callbackAction: "on_issue_status" }),
};