izyim-mockapi/node_modules/json-server/lib/server/router/index.js

'use strict';

const express = require('express');
const methodOverride = require('method-override');
const _ = require('lodash');
const lodashId = require('lodash-id');
const low = require('lowdb');
const fileAsync = require('lowdb/lib/storages/file-async');
const bodyParser = require('../body-parser');
const validateData = require('./validate-data');
const plural = require('./plural');
const nested = require('./nested');
const singular = require('./singular');
const mixins = require('../mixins');

module.exports = (source, opts = { foreignKeySuffix: 'Id' }) => {
  // Create router
  const router = express.Router();

  // Add middlewares
  router.use(methodOverride());
  router.use(bodyParser);

  // Create database
  let db;
  if (_.isObject(source)) {
    db = low();
    db.setState(source);
  } else {
    db = low(source, { storage: fileAsync });
  }

  validateData(db.getState());

  // Add lodash-id methods to db
  db._.mixin(lodashId);

  // Add specific mixins
  db._.mixin(mixins);

  // Expose database
  router.db = db;

  // Expose render
  router.render = (req, res) => {
    res.jsonp(res.locals.data);
  };

  // GET /db
  router.get('/db', (req, res) => {
    res.jsonp(db.getState());
  });

  // Handle /:parent/:parentId/:resource
  router.use(nested(opts));

  // Create routes
  db.forEach((value, key) => {
    if (_.isPlainObject(value)) {
      router.use(`/${key}`, singular(db, key));
      return;
    }

    if (_.isArray(value)) {
      router.use(`/${key}`, plural(db, key, opts));
      return;
    }

    var sourceMessage = '';
    if (!_.isObject(source)) {
      sourceMessage = `in ${source}`;
    }

    const msg = `Type of "${key}" (${typeof value}) ${sourceMessage} is not supported. ` + `Use objects or arrays of objects.`;

    throw new Error(msg);
  }).value();

  router.use((req, res) => {
    if (!res.locals.data) {
      res.status(404);
      res.locals.data = {};
    }

    router.render(req, res);
  });

  router.use((err, req, res, next) => {
    console.error(err.stack);
    res.status(500).send(err.stack);
  });

  return router;
};