Homework pirple#1

Signed-off-by: Skye.Wu <[email protected]>

Homework Assignment #1/config.js

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+/**
+ * This is node environment configuration file
+ * 
+ */
+
+//  environment
+const environment = {};
+
+// normal environment
+environment.normal = {
+    httpPort: 8000,
+};
+
+// environment to export
+const environmentToExport = environment[process.env.NODE_ENV] || environment.normal;
+
+// export
+module.exports = environmentToExport;

Homework Assignment #1/index.js

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+/**
+ * Homework Assignment #1
+
+    This is the first of several homework assignments you'll receive in this course. In order to receive your certificate of completion (at the end of this course) you must complete all the assignments and receive a passing grade. 
+
+    How to Turn It In:
+
+    1. Create a public github repo for this assignment. 
+
+    2. Create a new post in the Facebook Group  and note "Homework Assignment #1" at the top.
+
+    3. In that thread, discuss what you have built, and include the link to your Github repo. 
+
+    The Assignment:
+
+    Please create a simple "Hello World" API. Meaning:
+
+    1. It should be a RESTful JSON API that listens on a port of your choice. 
+
+    2. When someone posts anything to the route /hello, you should return a welcome message, in JSON format. This message can be anything you want. 
+ */
+
+// import library
+const http = require('http');
+const routes = require('./routes');
+const config = require('./config');
+
+// create http server
+const httpServer = http.createServer(routes);
+
+// listen http port
+httpServer.listen(config.httpPort, () => {
+    console.log(`HTTP Server is running on port ${config.httpPort} now.`);
+});

Homework Assignment #1/routes.js

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+/**
+ * This is route handler
+ * 
+ */
+
+// request pathname parse
+const getPathname = (url) => {
+    return url.replace(/^\/|\/$/g, '').trim();
+};
+
+// welcome message
+const welcome = (req) => {
+    const pathname = getPathname(req.url);
+    const method = req.method.toUpperCase();
+    return `[${method}] /${pathname} Welcome!`;
+};
+
+// common method
+const methods = {
+    get: (req, res) => {
+        res.end(welcome(req));
+    },
+    post: (req, res) => {
+        res.end(welcome(req));
+    },
+    put: (req, res) => {
+        res.end(welcome(req));
+    },
+    delete: (req, res) => {
+        res.end(welcome(req));
+    },
+};
+
+// routes mapping rules
+const routeRules = {};
+
+// route hello
+routeRules.hello = Object.assign({}, methods);
+
+// route not found
+routeRules.notFound = (req, res) => {
+    const pathname = getPathname(req.url);
+    const method = req.method.toUpperCase();
+    res.writeHead(404);
+    res.end(`[${method}] /${pathname} Not found!`);
+};
+
+// routes handle function
+const routes = (req, res) => {
+    const pathname = getPathname(req.url);
+    const method = req.method.toLowerCase();
+    const route = routeRules[pathname];
+
+    if (route[method]) {
+        route[method](req, res);
+    } else {
+        routeRules.notFound(req, res);
+    }
+};
+
+
+//  export
+module.exports = routes;