wa-chat-server/lib/class/MessageRequestFilter.js

Watson Assistant powered chat server

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.MessageRequestFilter = void 0;
/**
 * This class preprocesses the request before it is sent to watson
 */
class MessageRequestFilter {
    constructor(logger, config, session) {
        this.logger = logger;
        this.config = config;
        this.session = session;
    }
    applyTo(req) {
        return __awaiter(this, void 0, void 0, function* () {
            const retVal = Object.assign({}, req.body);
            let client = null;
            if (retVal.client) {
                client = retVal.client;
                delete retVal.client;
            }
            retVal.context = retVal.context || {};
            if ('context' in this.session.currentData()) {
                retVal.context = Object.assign(Object.assign({}, this.session.currentData().context), retVal.context);
            }
            if (client && this.config.client_data_max_size_in_bytes) {
                const dataSize = JSON.stringify(client).length;
                if (dataSize > this.config.client_data_max_size_in_bytes) {
                    yield this.logger.warn(`${this.constructor.name}, sessionId=${this.session.sessionId}:` +
                        ` trying to pass ${dataSize}B` +
                        ` to Watson context, only ${this.config.client_data_max_size_in_bytes}B allowed`);
                }
                else {
                    Object.assign(retVal.context, { client });
                }
            }
            return retVal;
        });
    }
}
exports.MessageRequestFilter = MessageRequestFilter;