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Commit 0ab8c56

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michaelliaomichaelliao
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add url2-koa
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‎samples/node/web/koa/url2-koa/.vscode/launch.json‎

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{
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"version": "0.2.0",
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"configurations": [
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{
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"name": "Start",
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"type": "node",
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"request": "launch",
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"program": "${workspaceRoot}/start.js",
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"stopOnEntry": false,
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"args": [],
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"cwd": "${workspaceRoot}",
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"preLaunchTask": null,
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"runtimeExecutable": null,
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"runtimeArgs": [
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"--nolazy"
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],
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"env": {
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"NODE_ENV": "development"
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},
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"externalConsole": false,
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"sourceMaps": false,
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"outDir": null
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}
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]
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}
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‎samples/node/web/koa/url2-koa/app.js‎

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const Koa = require('koa');
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const bodyParser = require('koa-bodyparser');
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const router = require('koa-router')();
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const fs = require('fs');
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const app = new Koa();
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// log request URL:
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app.use(async (ctx, next) => {
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console.log(`Process ${ctx.request.method} ${ctx.request.url}...`);
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await next();
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});
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// parse request body:
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app.use(bodyParser());
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// add url-route in /controllers:
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function addMapping(router, mapping) {
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for (var url in mapping) {
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if (url.startsWith('GET ')) {
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var path = url.substring(4);
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router.get(path, mapping[url]);
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console.log(`register URL mapping: GET ${path}`);
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} else if (url.startsWith('POST ')) {
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var path = url.substring(5);
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router.post(path, mapping[url]);
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console.log(`register URL mapping: POST ${path}`);
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} else {
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console.log(`invalid URL: ${url}`);
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}
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}
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}
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function addControllers(router) {
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var files = fs.readdirSync(__dirname + '/controllers');
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var js_files = files.filter((f) => {
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return f.endsWith('.js');
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}, files);
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for (var f of js_files) {
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console.log(`process controller: ${f}...`);
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const mapping = require(__dirname + '/controllers/' + f);
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addMapping(router, mapping);
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}
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}
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addControllers(router);
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// add router middleware:
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app.use(router.routes());
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app.listen(3000);
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console.log('app started at port 3000...');
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‎samples/node/web/koa/url2-koa/controllers/hello.js‎

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var fn_hello = async (ctx, next) => {
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var name = ctx.params.name;
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ctx.response.body = `<h1>Hello, ${name}!</h1>`;
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};
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module.exports = {
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'GET /hello/:name': fn_hello
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};
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‎samples/node/web/koa/url2-koa/controllers/index.js‎

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var fn_index = async (ctx, next) => {
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ctx.response.body = `<h1>Index</h1>
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<form action="/signin" method="post">
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<p>Name: <input name="name" value="koa"></p>
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<p>Password: <input name="password" type="password"></p>
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<p><input type="submit" value="Submit"></p>
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</form>`;
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};
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var fn_signin = async (ctx, next) => {
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var
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name = ctx.request.body.name || '',
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password = ctx.request.body.password || '';
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console.log(`signin with name: ${name}, password: ${password}`);
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if (name === 'koa' && password === '12345') {
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ctx.response.body = `<h1>Welcome, ${name}!</h1>`;
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} else {
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ctx.response.body = `<h1>Login failed!</h1>
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<p><a href="/">Try again</a></p>`;
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}
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};
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module.exports = {
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'GET /': fn_index,
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'POST /signin': fn_signin
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};
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‎samples/node/web/koa/url2-koa/package.json‎

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{
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"name": "hello-koa2",
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"version": "1.0.0",
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"description": "Hello Koa 2 example with async",
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"main": "start.js",
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"scripts": {
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"start": "node start.js"
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},
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"keywords": [
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"koa",
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"async"
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],
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"author": "Michael Liao",
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"license": "Apache-2.0",
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"repository": {
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"type": "git",
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"url": "https://github.com/michaelliao/learn-javascript.git"
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},
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"dependencies": {
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"babel-core": "6.13.2",
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"babel-polyfill": "6.13.0",
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"babel-preset-es2015-node6": "0.3.0",
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"babel-preset-stage-3": "6.5.0",
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"koa": "2.0.0",
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"koa-bodyparser": "3.2.0",
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"koa-router": "7.0.0"
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}
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}
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‎samples/node/web/koa/url2-koa/start.js‎

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require('babel-core/register')({
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presets: ['stage-3']
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});
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require('./app.js');

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