LibreChat/api/server/middleware/buildEndpointOption.js

const { parseCompactConvo, EModelEndpoint, isAgentsEndpoint } = require('librechat-data-provider');
const { getModelsConfig } = require('~/server/controllers/ModelController');
const azureAssistants = require('~/server/services/Endpoints/azureAssistants');
const assistants = require('~/server/services/Endpoints/assistants');
const gptPlugins = require('~/server/services/Endpoints/gptPlugins');
const { processFiles } = require('~/server/services/Files/process');
const anthropic = require('~/server/services/Endpoints/anthropic');
const bedrock = require('~/server/services/Endpoints/bedrock');
const openAI = require('~/server/services/Endpoints/openAI');
const agents = require('~/server/services/Endpoints/agents');
const custom = require('~/server/services/Endpoints/custom');
const google = require('~/server/services/Endpoints/google');
const { handleError } = require('~/server/utils');

const buildFunction = {
  [EModelEndpoint.openAI]: openAI.buildOptions,
  [EModelEndpoint.google]: google.buildOptions,
  [EModelEndpoint.custom]: custom.buildOptions,
  [EModelEndpoint.agents]: agents.buildOptions,
  [EModelEndpoint.bedrock]: bedrock.buildOptions,
  [EModelEndpoint.azureOpenAI]: openAI.buildOptions,
  [EModelEndpoint.anthropic]: anthropic.buildOptions,
  [EModelEndpoint.gptPlugins]: gptPlugins.buildOptions,
  [EModelEndpoint.assistants]: assistants.buildOptions,
  [EModelEndpoint.azureAssistants]: azureAssistants.buildOptions,
};

async function buildEndpointOption(req, res, next) {
  const { endpoint, endpointType } = req.body;
  let parsedBody = parseCompactConvo({ endpoint, endpointType, conversation: req.body });

  if (req.app.locals.modelSpecs?.list && req.app.locals.modelSpecs?.enforce) {
    /** @type {{ list: TModelSpec[] }}*/
    const { list } = req.app.locals.modelSpecs;
    const { spec } = parsedBody;

    if (!spec) {
      return handleError(res, { text: 'No model spec selected' });
    }

    const currentModelSpec = list.find((s) => s.name === spec);
    if (!currentModelSpec) {
      return handleError(res, { text: 'Invalid model spec' });
    }

    if (endpoint !== currentModelSpec.preset.endpoint) {
      return handleError(res, { text: 'Model spec mismatch' });
    }

    if (
      currentModelSpec.preset.endpoint !== EModelEndpoint.gptPlugins &&
      currentModelSpec.preset.tools
    ) {
      return handleError(res, {
        text: `Only the "${EModelEndpoint.gptPlugins}" endpoint can have tools defined in the preset`,
      });
    }

    parsedBody = parseCompactConvo({
      endpoint,
      endpointType,
      conversation: currentModelSpec.preset,
    });
  }

  const endpointFn = buildFunction[endpointType ?? endpoint];
  const builder = isAgentsEndpoint(endpoint) ? (...args) => endpointFn(req, ...args) : endpointFn;

  // TODO: use object params
  req.body.endpointOption = builder(endpoint, parsedBody, endpointType);

  // TODO: use `getModelsConfig` only when necessary
  const modelsConfig = await getModelsConfig(req);
  req.body.endpointOption.modelsConfig = modelsConfig;

  if (req.body.files) {
    // hold the promise
    req.body.endpointOption.attachments = processFiles(req.body.files);
  }
  next();
}

module.exports = buildEndpointOption;