api/server/services/Files/Audio/getVoices.js

const { TTSProviders } = require('librechat-data-provider');
const { getAppConfig } = require('~/server/services/Config');
const { getProvider } = require('./TTSService');

/**
 * This function retrieves the available voices for the current TTS provider
 * It first fetches the TTS configuration and determines the provider
 * Then, based on the provider, it sends the corresponding voices as a JSON response
 *
 * @param {Object} req - The request object
 * @param {Object} res - The response object
 * @returns {Promise<void>}
 * @throws {Error} - If the provider is not 'openai' or 'elevenlabs', an error is thrown
 */
async function getVoices(req, res) {
  try {
    const appConfig =
      req.config ??
      (await getAppConfig({
        role: req.user?.role,
      }));

    const ttsSchema = appConfig?.speech?.tts;
    if (!ttsSchema) {
      throw new Error('Configuration or TTS schema is missing');
    }

    const provider = await getProvider(appConfig);
    let voices;

    switch (provider) {
      case TTSProviders.OPENAI:
        voices = ttsSchema.openai?.voices;
        break;
      case TTSProviders.AZURE_OPENAI:
        voices = ttsSchema.azureOpenAI?.voices;
        break;
      case TTSProviders.ELEVENLABS:
        voices = ttsSchema.elevenlabs?.voices;
        break;
      case TTSProviders.LOCALAI:
        voices = ttsSchema.localai?.voices;
        break;
      default:
        throw new Error('Invalid provider');
    }

    res.json(voices);
  } catch (error) {
    res.status(500).json({ error: `Failed to get voices: ${error.message}` });
  }
}

module.exports = getVoices;