Added 'hackyourinfo' app - a small web server for students to POST info to as a learning aid in Week 1.

joostlubach · joostlubach · commit 4dc517f4eb39 · 2019-01-27T11:33:30.000+01:00
Usage:

- Deploy somehwere (e.g. using now: `now -p -n hackyourinfo`)
- Give URL to users
- Endpoints:

POST /:name.json : Post any JSON body to save info for a student.
GET /:name.json : Retrieve that student JSON body
GET /_all.json : Retrieve all students' info
DELETE /:name.json : Delete one student's info.
DELETE /_all.json : Start over
diff --git a/apps/hackyourinfo/index.js b/apps/hackyourinfo/index.js
@@ -0,0 +1,101 @@
+const express = require('express')
+const fs = require('fs-extra')
+const path = require('path')
+const bodyParser = require('body-parser')
+const cors = require('cors')
+
+const rootDir = path.resolve(__dirname)
+const infoDir = path.join(rootDir, 'info')
+
+const app = express()
+
+app.use(bodyParser.json())
+app.use(cors())
+
+app.post('/:name.json', async (request, response) => {
+  try {
+    const filename = path.join(infoDir, `${request.params.name}.json`)
+    await fs.writeFile(filename, JSON.stringify(request.body, null, 2))
+    response.statusCode = 200
+    response.json({ok: true})
+  } catch (error) {
+    response.statusCode = 500
+    response.json({error: "An error occurred"})
+    console.error(error)
+  }
+
+  response.end()
+})
+
+app.get('/_all.json', async (request, response) => {
+  try {
+    const files = await fs.readdir(infoDir)
+    const promises = files.map(file => fs.readFile(path.join(infoDir, file), 'utf8').then(raw => [file, raw]))
+    const raws = await Promise.all(promises)
+
+    const result = {}
+    for (const [file, raw] of raws) {
+      result[file.replace(/\.json$/, '')] = JSON.parse(raw)
+    }
+    response.json(result)
+  } catch (error) {
+    response.statusCode = 500
+    response.json({error: "An error occurred"})
+    console.error(error)
+  }
+  response.end()
+})
+
+app.get('/:name.json', async (request, response) => {
+  try {
+    const filename = path.join(infoDir, `${request.params.name}.json`)
+    const raw = await fs.readFile(filename, 'utf8')
+    response.json(JSON.parse(raw))
+  } catch (error) {
+    if (error.code === 'ENOENT') {
+      response.statusCode = 404
+      response.json({error: "File not found"})
+    } else {
+      response.statusCode = 500
+      response.json({error: "An error occurred"})
+      console.error(error)
+    }
+  }
+  response.end()
+})
+
+app.delete('/_all.json', async (request, response) => {
+  try {
+    await fs.emptyDir(infoDir)
+    response.json({ok: true})
+  } catch (error) {
+    response.statusCode = 500
+    response.json({error: "An error occurred"})
+    console.error(error)
+  }
+  response.end()
+})
+
+app.delete('/:name.json', async (request, response) => {
+  try {
+    await fs.unlink(path.join(infoDir, `${request.params.name}.json`))
+    response.json({ok: true})
+  } catch (error) {
+    if (error.code !== 'ENOENT') {
+      response.statusCode = 500
+      response.json({error: "An error occurred"})
+      console.error(error)
+    } else {
+      response.json({ok: true})
+    }
+  }
+  response.end()
+})
+
+app.use((request, response) => {
+  response.statusCode = 404
+  response.json({error: "Not found"})
+  response.end()
+})
+
+app.listen(process.env.PORT || 80)
diff --git a/apps/hackyourinfo/package.json b/apps/hackyourinfo/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "hackyourinfo",
+  "version": "1.0.0",
+  "description": "Small webserver for class collaboration.",
+  "main": "index.js",
+  "author": "Joost Lubach",
+  "license": "MIT",
+  "private": false,
+  "dependencies": {
+    "body-parser": "^1.18.3",
+    "cors": "^2.8.5",
+    "express": "^4.16.4",
+    "fs-extra": "^7.0.1"
+  },
+  "scripts": {
+    "start": "node ."
+  }
+}
diff --git a/apps/hackyourinfo/yarn.lock b/apps/hackyourinfo/yarn.lock
