initial revamp of cognigy verb to use gather, accept session and turn-level config from bot

lib/tasks/cognigy/speech-config.js

@@ -0,0 +1,68 @@
+const Emitter = require('events');
+
+const hasKeys = (obj) => typeof obj === 'object' && Object.keys(obj) > 0;
+
+class SpeechConfig extends Emitter {
+  constructor({logger, ep, opts = {}}) {
+    super();
+    this.logger = logger;
+    this.ep = ep;
+    this.sessionConfig = opts.session || {};
+    this.turnConfig = opts.nextTurn || {};
+    this.update(opts);
+  }
+
+  update(opts = {}) {
+    const {session, nextTurn = {}} = opts;
+    if (session) this.sessionConfig = {...this.sessionConfig, ...session};
+    this.turnConfig = nextTurn;
+    this.logger.debug({opts, sessionLevel: this.sessionConfig, turnLevel: this.turnConfig}, 'SpeechConfig updated');
+  }
+
+  makeGatherTaskConfig(prompt) {
+    const opts = JSON.parse(JSON.stringify(this.sessionConfig || {}));
+    const nextTurnKeys = Object.keys(this.turnConfig || {});
+    const newKeys = nextTurnKeys.filter((k) => !(k in opts));
+    const bothKeys = nextTurnKeys.filter((k) => k in opts);
+
+    for (const key of newKeys) opts[key] = this.turnConfig[key];
+    for (const key of bothKeys) opts[key] = {...opts[key], ...this.turnConfig[key]};
+
+    this.logger.debug({
+      opts,
+      sessionConfig: this.sessionConfig,
+      turnConfig: this.turnConfig,
+    }, 'Congigy SpeechConfig:_makeGatherTask current options');
+
+    /* input type: speech and/or dtmf entry */
+    const input = [];
+    if (opts.recognizer) input.push('speech');
+    if (hasKeys(opts.dtmf)) input.push('digits');
+
+    /* bargein settings */
+    const bargein = opts.bargein || {};
+    const speechBargein = Array.isArray(bargein.enable) && bargein.enable.includes('speech');
+    const minBargeinWordCount = speechBargein ? (bargein.minWordCount || 1) : 0;
+    const sayConfig = {
+      text: prompt,
+      synthesizer: opts.synthesizer
+    };
+    const config = {
+      input,
+      listenDuringPrompt: speechBargein,
+      bargein: speechBargein,
+      minBargeinWordCount,
+      recognizer: opts?.recognizer,
+      timeout: opts?.user?.noInputTimeout || 0,
+      say: sayConfig
+    };
+
+    this.logger.debug({config}, 'Congigy SpeechConfig:_makeGatherTask config');
+
+    /* turn config can now be emptied for next turn of conversation */
+    this.turnConfig = {};
+    return config;
+  }
+}
+
+module.exports = SpeechConfig;