303 lines
9.3 KiB
JavaScript
303 lines
9.3 KiB
JavaScript
"use strict";
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function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }
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function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(source, true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(source).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
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function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
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const express = require('express');
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const _ = require('lodash');
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const pluralize = require('pluralize');
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const write = require('./write');
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const getFullURL = require('./get-full-url');
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const utils = require('../utils');
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const delay = require('./delay');
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module.exports = (db, name, opts) => {
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// Create router
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const router = express.Router();
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router.use(delay); // Embed function used in GET /name and GET /name/id
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function embed(resource, e) {
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e && [].concat(e).forEach(externalResource => {
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if (db.get(externalResource).value) {
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const query = {};
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const singularResource = pluralize.singular(name);
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query[`${singularResource}${opts.foreignKeySuffix}`] = resource.id;
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resource[externalResource] = db.get(externalResource).filter(query).value();
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}
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});
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} // Expand function used in GET /name and GET /name/id
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function expand(resource, e) {
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e && [].concat(e).forEach(innerResource => {
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const plural = pluralize(innerResource);
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if (db.get(plural).value()) {
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const prop = `${innerResource}${opts.foreignKeySuffix}`;
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resource[innerResource] = db.get(plural).getById(resource[prop]).value();
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}
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});
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} // GET /name
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// GET /name?q=
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// GET /name?attr=&attr=
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// GET /name?_end=&
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// GET /name?_start=&_end=&
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// GET /name?_embed=&_expand=
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function list(req, res, next) {
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// Resource chain
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let chain = db.get(name); // Remove q, _start, _end, ... from req.query to avoid filtering using those
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// parameters
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let q = req.query.q;
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let _start = req.query._start;
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let _end = req.query._end;
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let _page = req.query._page;
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const _sort = req.query._sort;
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const _order = req.query._order;
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let _limit = req.query._limit;
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const _embed = req.query._embed;
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const _expand = req.query._expand;
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delete req.query.q;
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delete req.query._start;
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delete req.query._end;
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delete req.query._sort;
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delete req.query._order;
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delete req.query._limit;
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delete req.query._embed;
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delete req.query._expand; // Automatically delete query parameters that can't be found
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// in the database
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Object.keys(req.query).forEach(query => {
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const arr = db.get(name).value();
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for (const i in arr) {
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if (_.has(arr[i], query) || query === 'callback' || query === '_' || /_lte$/.test(query) || /_gte$/.test(query) || /_ne$/.test(query) || /_like$/.test(query)) return;
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}
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delete req.query[query];
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});
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if (q) {
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// Full-text search
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if (Array.isArray(q)) {
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q = q[0];
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}
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q = q.toLowerCase();
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chain = chain.filter(obj => {
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for (const key in obj) {
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const value = obj[key];
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if (db._.deepQuery(value, q)) {
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return true;
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}
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}
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});
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}
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Object.keys(req.query).forEach(key => {
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// Don't take into account JSONP query parameters
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// jQuery adds a '_' query parameter too
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if (key !== 'callback' && key !== '_') {
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// Always use an array, in case req.query is an array
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const arr = [].concat(req.query[key]);
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const isDifferent = /_ne$/.test(key);
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const isRange = /_lte$/.test(key) || /_gte$/.test(key);
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const isLike = /_like$/.test(key);
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const path = key.replace(/(_lte|_gte|_ne|_like)$/, '');
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chain = chain.filter(element => {
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return arr.map(function (value) {
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// get item value based on path
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// i.e post.title -> 'foo'
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const elementValue = _.get(element, path); // Prevent toString() failing on undefined or null values
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if (elementValue === undefined || elementValue === null) {
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return;
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}
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if (isRange) {
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const isLowerThan = /_gte$/.test(key);
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return isLowerThan ? value <= elementValue : value >= elementValue;
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} else if (isDifferent) {
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return value !== elementValue.toString();
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} else if (isLike) {
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return new RegExp(value, 'i').test(elementValue.toString());
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} else {
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return value === elementValue.toString();
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}
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}).reduce((a, b) => isDifferent ? a && b : a || b);
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});
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}
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}); // Sort
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if (_sort) {
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const _sortSet = _sort.split(',');
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const _orderSet = (_order || '').split(',').map(s => s.toLowerCase());
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chain = chain.orderBy(_sortSet, _orderSet);
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} // Slice result
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if (_end || _limit || _page) {
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res.setHeader('X-Total-Count', chain.size());
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res.setHeader('Access-Control-Expose-Headers', `X-Total-Count${_page ? ', Link' : ''}`);
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}
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if (_page) {
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_page = parseInt(_page, 10);
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_page = _page >= 1 ? _page : 1;
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_limit = parseInt(_limit, 10) || 10;
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const page = utils.getPage(chain.value(), _page, _limit);
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const links = {};
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const fullURL = getFullURL(req);
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if (page.first) {
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links.first = fullURL.replace(`page=${page.current}`, `page=${page.first}`);
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}
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if (page.prev) {
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links.prev = fullURL.replace(`page=${page.current}`, `page=${page.prev}`);
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}
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if (page.next) {
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links.next = fullURL.replace(`page=${page.current}`, `page=${page.next}`);
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}
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if (page.last) {
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links.last = fullURL.replace(`page=${page.current}`, `page=${page.last}`);
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}
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res.links(links);
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chain = _.chain(page.items);
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} else if (_end) {
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_start = parseInt(_start, 10) || 0;
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_end = parseInt(_end, 10);
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chain = chain.slice(_start, _end);
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} else if (_limit) {
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_start = parseInt(_start, 10) || 0;
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_limit = parseInt(_limit, 10);
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chain = chain.slice(_start, _start + _limit);
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} // embed and expand
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chain = chain.cloneDeep().forEach(function (element) {
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embed(element, _embed);
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expand(element, _expand);
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});
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res.locals.data = chain.value();
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next();
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} // GET /name/:id
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// GET /name/:id?_embed=&_expand
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function show(req, res, next) {
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const _embed = req.query._embed;
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const _expand = req.query._expand;
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const resource = db.get(name).getById(req.params.id).value();
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if (resource) {
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// Clone resource to avoid making changes to the underlying object
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const clone = _.cloneDeep(resource); // Embed other resources based on resource id
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// /posts/1?_embed=comments
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embed(clone, _embed); // Expand inner resources based on id
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// /posts/1?_expand=user
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expand(clone, _expand);
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res.locals.data = clone;
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}
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next();
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} // POST /name
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function create(req, res, next) {
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let resource;
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if (opts._isFake) {
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const id = db.get(name).createId().value();
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resource = _objectSpread({}, req.body, {
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id
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});
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} else {
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resource = db.get(name).insert(req.body).value();
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}
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res.setHeader('Access-Control-Expose-Headers', 'Location');
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res.location(`${getFullURL(req)}/${resource.id}`);
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res.status(201);
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res.locals.data = resource;
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next();
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} // PUT /name/:id
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// PATCH /name/:id
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function update(req, res, next) {
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const id = req.params.id;
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let resource;
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if (opts._isFake) {
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resource = db.get(name).getById(id).value();
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if (req.method === 'PATCH') {
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resource = _objectSpread({}, resource, {}, req.body);
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} else {
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resource = _objectSpread({}, req.body, {
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id: resource.id
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});
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}
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} else {
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let chain = db.get(name);
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chain = req.method === 'PATCH' ? chain.updateById(id, req.body) : chain.replaceById(id, req.body);
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resource = chain.value();
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}
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if (resource) {
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res.locals.data = resource;
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}
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next();
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} // DELETE /name/:id
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function destroy(req, res, next) {
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let resource;
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if (opts._isFake) {
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resource = db.get(name).value();
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} else {
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resource = db.get(name).removeById(req.params.id).value(); // Remove dependents documents
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const removable = db._.getRemovable(db.getState(), opts);
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removable.forEach(item => {
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db.get(item.name).removeById(item.id).value();
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});
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}
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if (resource) {
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res.locals.data = {};
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}
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next();
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}
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const w = write(db);
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router.route('/').get(list).post(create, w);
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router.route('/:id').get(show).put(update, w).patch(update, w).delete(destroy, w);
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return router;
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}; |