Code files

Chapter05/receiving-post-data/accepting-json/server.js

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+'use strict'
+
+const http = require('http')
+const fs = require('fs')
+const path = require('path')
+const parse = require('fast-json-parse')
+const form = fs.readFileSync(path.join(__dirname, 'public', 'form.html'))
+const maxData = 2 * 1024 * 1024 // 2mb
+
+http.createServer((req, res) => {
+  if (req.method === 'GET') {
+    get(res)
+    return
+  }
+  if (req.method === 'POST') {
+    post(req, res)
+    return
+  }
+  reject(405, 'Method Not Allowed', res)
+}).listen(8080)
+
+function get (res) {
+  res.writeHead(200, {'Content-Type': 'text/html'})
+  res.end(form)  
+}
+
+function post (req, res) {
+  if (req.headers['content-type'] !== 'application/json') {
+    reject(415, 'Unsupported Media Type', res)
+    return
+  }
+  const size = parseInt(req.headers['content-length'], 10)
+  if (isNaN(size)) {
+    reject(400, 'Bad Request', res)
+    return
+  }
+  if (size > maxData) {
+    reject(413, 'Too Large', res)
+    return
+  }
+  const buffer = Buffer.allocUnsafe(size)
+  var pos = 0
+
+  req
+    .on('data', (chunk) => {
+      const offset = pos + chunk.length
+      if (offset > size) {
+        reject(413, 'Too Large', res)
+        return
+      }
+      chunk.copy(buffer, pos)
+      pos = offset
+    })
+    .on('end', () => {
+      if (pos !== size) {
+        reject(400, 'Bad Request', res)
+        return
+      }
+      const data = buffer.toString()
+      const parsed = parse(data)
+      if (parsed.err) {
+        reject(400, 'Bad Request', res)
+        return  
+      }
+      console.log('User Posted: ', parsed.value)
+      res.end('{"data": ' + data + "}")
+    })
+}
+
+function reject (code, msg, res) {
+  res.statusCode = code
+  res.end(msg)
+}