Chapter 4: initial recipe samples

Chapter04/post-server/json-server.js

@@ -0,0 +1,56 @@
+const http = require('http')
+const fs = require('fs')
+const path = require('path')
+
+const form = fs.readFileSync(path.join(__dirname, 'public', 'form.html'))
+
+http.createServer((req, res) => {
+    if (req.method === 'GET') {
+        get(res)
+        return
+    }
+
+    if (req.method === 'POST') {
+        post(req, res)
+        return
+    }
+    error(405, res)
+}).listen(3000)
+
+function get(res) {
+    res.writeHead(200, {
+        'Content-Type': 'text/html'
+    })
+    res.end(form)
+}
+
+function post(req, res) {
+    if (req.headers['content-type'] !== 'application/json') {
+        error(415, res)
+        return
+    }
+
+    let input = '';
+
+    req.on('data', chunk => {
+        input += chunk.toString()
+    })
+
+    req.on('end', () => {
+        const parsed = JSON.parse(input)
+
+        if (parsed.err) {
+            error(400, 'Bad Request', res)
+            return
+        }
+
+        console.log('Received data: ', parsed)
+        res.end('{"data": ' + input + "}")
+    })
+
+}
+
+function error(code, res) {
+    res.statusCode = code
+    res.end(http.STATUS_CODES[code])
+}

Chapter04/post-server/public/form.html

@@ -0,0 +1,30 @@
+<form method="POST">
+    <label for="forename">Forename:</label>
+    <input id="forename" name="forename">
+    <label for="surname">Surname:</label>
+    <input id="surname" name="surname">
+    <input type="submit" value="Submit">
+</form>
+
+<script>
+    document.forms[0].addEventListener('submit', (event) => {
+        event.preventDefault()
+
+        let data = {
+            'forename': document.getElementById('forename').value,
+            'surname': document.getElementById('surname').value
+        };
+        console.log('data', data);
+
+        fetch('http://localhost:3000', {
+            method: 'post',
+            headers: {
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify(data)
+        }).then(function (response) {
+            console.log(response);
+            return response.json();
+        });
+    });
+</script>

Chapter04/post-server/server.js

@@ -0,0 +1,48 @@
+const http = require('http')
+const fs = require('fs')
+const path = require('path')
+
+const form = fs.readFileSync(path.join(__dirname, 'public', 'form.html'))
+
+http.createServer((req, res) => {
+    if (req.method === 'GET') {
+        get(res)
+        return
+    }
+
+    if (req.method === 'POST') {
+        post(req, res)
+        return
+    }
+    error(405, res)
+}).listen(3000)
+
+function get(res) {
+    res.writeHead(200, {
+        'Content-Type': 'text/html'
+    })
+    res.end(form)
+}
+
+function post(req, res) {
+    if (req.headers['content-type'] !== 'application/x-www-form-urlencoded') {
+        error(415, res)
+        return
+    }
+
+    let input = '';
+
+    req.on('data', chunk => {
+        input += chunk.toString()
+    })
+
+    req.on('end', () => {
+        console.log(input);
+        res.end(http.STATUS_CODES[200])
+    })
+}
+
+function error(code, res) {
+    res.statusCode = code
+    res.end(http.STATUS_CODES[code])
+}