botbuilder/lib/setSpeakMiddleware.js

"use strict";
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
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.SetSpeakMiddleware = void 0;
const botbuilder_core_1 = require("botbuilder-core");
const htmlparser2_1 = require("htmlparser2");
const botbuilder_stdlib_1 = require("botbuilder-stdlib");
const supportedChannels = new Set([botbuilder_core_1.Channels.DirectlineSpeech, botbuilder_core_1.Channels.Emulator, botbuilder_core_1.Channels.Telephony]);
// Iterate through `obj` and all children in an attempt to locale a key `tag`
function hasTag(tag, nodes) {
    while (nodes.length) {
        const item = nodes.shift();
        if (botbuilder_stdlib_1.tests.isDictionary(item)) {
            if (item.tagName === tag) {
                return true;
            }
            if (botbuilder_stdlib_1.tests.isArray(item.children)) {
                nodes.push(...item.children);
            }
        }
    }
    return false;
}
/**
 * Support the DirectLine speech and telephony channels to ensure the appropriate SSML tags are set on the
 * Activity Speak property.
 */
class SetSpeakMiddleware {
    /**
     * Initializes a new instance of the SetSpeakMiddleware class.
     *
     * @param voiceName The SSML voice name attribute value.
     * @param fallbackToTextForSpeak true if an empty Activity.Speak is populated with Activity.Text.
     */
    constructor(voiceName, fallbackToTextForSpeak) {
        this.voiceName = voiceName;
        this.fallbackToTextForSpeak = fallbackToTextForSpeak;
    }
    /**
     * Processes an incoming activity.
     *
     * @param turnContext The context object for this turn.
     * @param next The delegate to call to continue the bot middleware pipeline.
     * @returns A promise representing the async operation.
     */
    onTurn(turnContext, next) {
        turnContext.onSendActivities((_ctx, activities, next) => __awaiter(this, void 0, void 0, function* () {
            yield Promise.all(activities.map((activity) => __awaiter(this, void 0, void 0, function* () {
                var _a, _b;
                if (activity.type !== botbuilder_core_1.ActivityTypes.Message) {
                    return;
                }
                if (this.fallbackToTextForSpeak && !activity.speak) {
                    activity.speak = activity.text;
                }
                const channelId = (_a = turnContext.activity.channelId) === null || _a === void 0 ? void 0 : _a.trim().toLowerCase();
                if (activity.speak && this.voiceName !== null && supportedChannels.has(channelId)) {
                    const nodes = htmlparser2_1.parseDocument(activity.speak).childNodes;
                    if (!hasTag('speak', nodes.slice())) {
                        if (!hasTag('voice', nodes.slice())) {
                            activity.speak = `<voice name='${this.voiceName}'>${activity.speak}</voice>`;
                        }
                        activity.speak = `<speak version='1.0' xmlns='http://www.w3.org/2001/10/synthesis' xml:lang='${(_b = activity.locale) !== null && _b !== void 0 ? _b : 'en-US'}'>${activity.speak}</speak>`;
                    }
                }
            })));
            return next();
        }));
        return next();
    }
}
exports.SetSpeakMiddleware = SetSpeakMiddleware;
//# sourceMappingURL=setSpeakMiddleware.js.map