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app.coffee
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app.coffee
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# Folder layout
# challenges/
# <name of challenge>/
# config.json describing challenge
# downloads/
# <file1>, .., <fileN>: downloadable challenge artifacts
# entries/
# votes/
express = require 'express'
session = require 'express-session'
FileStore = require('session-file-store') session
fs = require 'fs'
sep = require('path').sep
formidable = require 'formidable'
app = do express
app.use session
store: new FileStore,
secret: 'keyboard cat', # TODO
resave: true,
saveUninitialized: true
# TODO: session tests
# See https://github.com/expressjs/session
# See https://github.com/valery-barysok/session-file-store/tree/master/examples/express-example
app.get '/session', (req, res) ->
if req.session.views
req.session.views++
res.setHeader 'Content-Type', 'text/html'
res.write '<p>views: ' + req.session.views + '</p>'
do res.end
else
req.session.views = 1
res.end 'Welcome to the file session demo. Refresh page!'
# Get challenges listing
# For REST info, see https://en.wikipedia.org/wiki/Representational_state_transfer
app.get '/challenges', (req, res) ->
fs.readdir __dirname + '/challenges', (error, files) ->
if not error?
# See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error
res.json files
else
res.end error.toString()
getChallenge = (id, isAdmin) ->
# Get information for challenge <id>
# TODO: use asynchronous file read?
challenge = JSON.parse fs.readFileSync __dirname + '/challenges/' + id + '/config.json'
challenge.id = id
challenge.status = 4 if isAdmin
challenge
# Get challenge information
# Use a status field: 1 = announced, 2 = running, 3 = vote, 4 = finished (default 0 = auto) to switch between states disregarding provided start and end times
app.get '/challenges/:id', (req, res) ->
challenge = getChallenge req.params.id, req.session.isAdmin
# TODO: use asynchronous file read
challenge.downloads = fs.readdirSync __dirname + '/challenges/' + req.params.id + '/downloads' if challenge.status > 1
challenge.uploadId = req.session.uploadId
# Available competition tracks are all files in the entries directory
# We have an audio file + .json file for each entry
# TODO: add current user's votes
fs.readdir __dirname + '/challenges/' + req.params.id + '/entries', (error, files) ->
challenge.entries = []
challenge.votes = {}
if not error? and challenge.status > 2
# See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error
files.forEach (file, index) ->
if file.endsWith '.json'
# Add entry data
entry = JSON.parse fs.readFileSync __dirname + '/challenges/' + req.params.id + '/entries/' + file
challenge.entries.push
path: entry.path
artist: if challenge.status > 3 then entry.artist else ''
title: entry.title
uploadId: entry.uploadId
if file.endsWith('.vote') and challenge.status > 3
# Add artist's votes
vote = JSON.parse fs.readFileSync __dirname + '/challenges/' + req.params.id + '/entries/' + file
for e, v of vote
challenge.votes[e] = (challenge.votes[e] || 0) + Number v
# Sort entries by vote if challenge.status > 3
if challenge.status > 3
challenge.entries.sort (a, b) ->
(challenge.votes[b.uploadId] || 0) - (challenge.votes[a.uploadId] || 0)
else
challenge.entries.sort (a, b) ->
if a.uploadId < b.uploadId
-1
else if b.uploadId < a.uploadId
1
else
0
res.json challenge
else
console.log error if error?
# TODO: res.end error.toString()
res.json challenge
# Download challenge artifact
# See https://arjunphp.com/download-file-node-js-express-js/
# TODO: only provide downloads after the challenge has started
app.get '/challenges/:id/downloads/:name(*)', (req, res) ->
path = __dirname + '/challenges/' + req.params.id + '/downloads/' + req.params.name
res.download path, req.params.name
# Download entry
# See https://arjunphp.com/download-file-node-js-express-js/
# TODO: only provide downloads after the challenge has started
app.get '/challenges/:id/entries/:name(*)', (req, res) ->
path = __dirname + '/challenges/' + req.params.id + '/entries/' + req.params.name
res.download path, req.params.name
# Use Formidable to handle (file) uploads
# https://github.com/felixge/node-formidable
app.post '/challenges/:id/upload', (req, res) ->
form = new formidable.IncomingForm
form.keepExtensions = true;
form.uploadDir = __dirname + '/challenges/' + req.params.id + '/entries/'
# Only allow uploads after the challenge has started (status == 2)
challenge = getChallenge req.params.id, req.session.isAdmin
return res.json { message: 'Challenge is not running. Uploads are not possible.' } unless challenge.status == 2
form.on 'fileBegin', (field, file) ->
# Remove 'upload_' prefix from file path's and care for previous upload session
path = file.path.split sep
comp = path[path.length - 1].substr(7).split('.')
path[path.length - 1] = (req.session.uploadId || comp[0]) + '.' + comp[1]
file.path = path.join sep
console.log 'receiving: ' + file.path
form.parse req, (error, fields, files) ->
console.log error if error?
# TODO: use fields.uploadId (if present) to overwrite existing entry
path = files.file.path.split sep
data =
artist: fields.artist
title: fields.title
path: path[path.length - 1]
uploadId: path[path.length - 1].split('.')[0]
# Keep the uploadId as session info in order to allow uploading and voting again
req.session.uploadId = data.uploadId
path[path.length - 1] = path[path.length - 1].split('.')[0] + '.json'
fs.writeFile path.join(sep), JSON.stringify(data), (error) ->
console.log error if error?
res.json data
app.post '/challenges/:id/vote', (req, res) ->
form = new formidable.IncomingForm
form.parse req, (error, fields, files) ->
console.log error if error?
return res.json { success: false } unless req.session.uploadId?
path = __dirname + '/challenges/' + req.params.id + '/entries/' + req.session.uploadId + '.vote'
fs.writeFile path, JSON.stringify(fields), (error) ->
console.log error if error?
res.json { success: true }
# Allow login as admin and using artist / uploadId
app.get '/login/:id?/:user/:pw', (req, res) ->
result = { success: false, message: 'This upload token does not seem to be valid for the challenge.' }
req.session.isAdmin = req.params.user is config.user && req.params.pw is config.pw
if req.session.isAdmin
result = { success: true, message: 'Welcome admin!' }
else if req.params.id?
# Try to load config file
entry = JSON.parse fs.readFileSync __dirname + '/challenges/' + req.params.id + '/entries/' + req.params.pw + '.json'
req.session.uploadId = entry.uploadId
result = { success: true, message: 'Welcome ' + entry.artist + '!' } if entry.artist?
res.json result
# Serve the frontend from subfolder www
app.use express.static __dirname + '/www'
server = app.listen 62416, () ->
host = server.address().address
port = server.address().port
console.log 'One hour challenge tool listening at http://%s:%s', host, port
# Startup code
try
# TODO: use asynchronous file read
config = fs.readFileSync __dirname + '/config.json'
config = JSON.parse config
console.log config
catch e
console.log "Error reading config: ", e
config =
user: 'admin'
pw: 'admin'