const mockFile = require('./mock/index'); const pathToRegexp = require('path-to-regexp'); const debug = console.log; const bodyParser = require('body-parser'); const BODY_PARSED_METHODS = ['post', 'put', 'patch']; function parseKey(key) { let method = 'get'; let path = key; if (key.indexOf(' ') > -1) { const splited = key.split(' '); method = splited[0].toLowerCase(); path = splited[1]; // eslint-disable-line } return { method, path, }; } function createHandler(method, path, handler) { return function(req, res, next) { if (BODY_PARSED_METHODS.includes(method)) { bodyParser.json({ limit: '5mb', strict: false })(req, res, () => { bodyParser.urlencoded({ limit: '5mb', extended: true })(req, res, () => { sendData(); }); }); } else { sendData(); } function sendData() { if (typeof handler === 'function') { handler(req, res, next); } else { res.json(handler); } } }; } function normalizeConfig(config) { return Object.keys(config).reduce((memo, key) => { const handler = config[key]; const { method, path } = parseKey(key); const keys = []; const re = pathToRegexp(path, keys); memo.push({ method, path, re, keys, handler: createHandler(method, path, handler), }); return memo; }, []); } const mockData = normalizeConfig(mockFile); function matchMock(req) { const { path: exceptPath } = req; const exceptMethod = req.method.toLowerCase(); for (const mock of mockData) { const { method, re, keys } = mock; if (method === exceptMethod) { const match = re.exec(req.path); if (match) { const params = {}; for (let i = 1; i < match.length; i = i + 1) { const key = keys[i - 1]; const prop = key.name; const val = decodeParam(match[i]); if (val !== undefined || !hasOwnProperty.call(params, prop)) { params[prop] = val; } } req.params = params; return mock; } } } function decodeParam(val) { if (typeof val !== 'string' || val.length === 0) { return val; } try { return decodeURIComponent(val); } catch (err) { if (err instanceof URIError) { err.message = `Failed to decode param ' ${val} '`; err.status = err.statusCode = 400; } throw err; } } return mockData.filter(({ method, re }) => { return method === exceptMethod && re.test(exceptPath); })[0]; } module.exports = (req, res, next) => { const match = matchMock(req); if (match) { debug(`mock matched: [${match.method}] ${match.path}`); return match.handler(req, res, next); } else { return next(); } };