@dvsa/appdev-api-common/utils/decode-payload-middleware.js

Utils library for common API functionality

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.DecodeBase64GzipPayload = void 0;
const http_status_codes_1 = require("../api/http-status-codes");
const compression_1 = require("./compression");
/**
 * Middleware to decode base64+gzip encoded request payloads and turn them into their JSON equivalent
 * @param {Request} request - Express request object
 * @param {Response} response - Express response object
 * @param {NextFunction} next - Next function to pass control to the next middleware
 * @param {Logger} logger - logger to indicate encoded requests
 * @constructor
 */
const DecodeBase64GzipPayload = (request, response, next, logger) => {
    const compressionHeaderValue = "base64+gzip";
    try {
        if (typeof request.body === "string" &&
            request.header("X-Payload-Encoding") === compressionHeaderValue) {
            logger?.debug("Encoded request received");
            request.body = compression_1.DataCompression.decompress(request.body);
        }
    }
    catch (err) {
        return response.status(http_status_codes_1.HttpStatus.BAD_REQUEST).send({
            error: "Bad request",
            message: err instanceof Error ? err.message : JSON.stringify(err),
        });
    }
    next();
};
exports.DecodeBase64GzipPayload = DecodeBase64GzipPayload;