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|
const fetch = require('node-fetch')
const fixWS = require('fix-whitespace')
const fs = require('fs')
const http = require('http')
const qs = require('querystring')
const url = require('url')
const util = require('util')
const readFile = util.promisify(fs.readFile)
// General page size.
const limit = 20
const page = async (request, response, text) => {
const cookies = parseCookies(request)
const notificationCount = await getMessageCount(cookies.username)
response.setHeader('Content-Type', 'text/html')
response.end(fixWS`
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Scratch</title>
<link rel="stylesheet" href="/style.css">
</head>
<body>
<header>
${cookies.username ? fixWS`
<p>You are logged in as ${cookies.username}. (<a href="/logout">Log out.</a>) You have ${'' + notificationCount} unread <a href="/notifications">${pluralize('notification', notificationCount)}</a>.</p>`
: fixWS`
<p>You are not logged in. <a href="/login">Log in.</a></p>
`}
<hr>
</header>
${text}
</body>
</html>
`)
}
const getMessageCount = function(username) {
return fetch(`https://api.scratch.mit.edu/proxy/users/${username}/activity/count`)
.then(res => res.json())
.then(foo => foo.msg_count)
}
const getNotifications = function(username, token, pageNumber = 1) {
const offset = (pageNumber - 1) * limit
return fetch(`https://api.scratch.mit.edu/users/${username}/messages?x-token=${token}&limit=${limit}&offset=${offset}`)
.then(res => res.json())
}
const markNotificationsAsRead = function(sessionID, csrfToken) {
return fetch(`https://scratch.mit.edu/site-api/messages/messages-clear/`, {
method: 'POST',
headers: {
// CSRF token must be specified in both header and cookie!
Cookie: `scratchsessionsid="${sessionID}"; scratchcsrftoken=${csrfToken}`,
Referer: 'https://scratch.mit.edu/messages/',
'X-CSRFToken': csrfToken
}
}).then(res => res.text()).then(text => console.log(text))
}
const getProject = function(projectID, token) {
return fetch(`https://api.scratch.mit.edu/projects/${projectID}?x-token=${token}`)
.then(res => res.json())
}
const getUser = function(username) {
return fetch(`https://api.scratch.mit.edu/users/${username}`)
.then(res => res.json())
}
const last = arr => arr[arr.length - 1]
const filterHTML = text => text.replace(/</g, '<').replace(/>/g, '>')
const pluralize = (word, n) => n === 1 ? word : word + 's'
const templates = {
user: username => `<a href="/users/${username}">${username}</a>`,
project: (name, id) => `<a href="/projects/${id}">${filterHTML(name.trim())}</a>`,
studio: (name, id) => `<a href="/studios/${id}">${filterHTML(name.trim())}</a>`,
forumThread: (name, id) => `<a href="/topics/${id}">${filterHTML(name.trim())}</a>`,
longField: text => {
return text.split('\n')
.map(filterHTML)
.reduce((arr, l, i, lines) =>
[...arr.slice(0, -1), ...l.trim().length
? (last(arr).length
? [last(arr) + '<br>\n ' + l]
: ['<p>' + l]).map(x => i === lines.length - 1 ? x + '</p>' : x)
: last(arr).length
? [last(arr) + '</p>', '']
: ['']],
[''])
.map(line => line.replace(/@([a-zA-Z0-9\-_]+)/g, (m, username) => fixWS`
<a href="/users/${username}">@${username}</a>
`))
.map(line => line.replace(/https?:\/\/([^."<>\s]\.)*scratch\.mit\.edu(\/[^"<>\s]*)/g, (url, subdomain, path) => {
const text = url
if (!subdomain) {
if (path.startsWith('/projects/')) {
url = path
} else if (path.startsWith('/users/')) {
url = path
}
}
return fixWS`
<a href="${url}">${text}</a>
`
}))
.join('\n')
},
notification: (notif, username) => {
let text = '<li>'
if (notif.type === 'addcomment') {
text += templates.user(notif.actor_username)
text += ` wrote a comment `
if (notif.comment_type === 0) {
text += 'on ' + templates.project(notif.comment_obj_title, notif.comment_obj_id)
} else if (notif.comment_type === 1) {
if (notif.comment_obj_title === username) {
text += `on <a href="/users/${notif.comment_obj_title}">your profile</a>`
} else {
text += `on <a href="/users/${notif.comment_obj_title}">${notif.comment_obj_title}'s profile</a>`
}
} else if (notif.comment_type === 2) {
text += 'in ' + templates.studio(notif.comment_obj_title, notif.comment_obj_id)
} else {
text += `somewhere I don't recognize (${notif.comment_type})`
}
} else if (notif.type === 'loveproject' || notif.type === 'favoriteproject') {
text += templates.user(notif.actor_username)
if (notif.type === 'loveproject') {
text += ` loved `
} else {
text += ` favorited `
}
text += `your project `
text += templates.project(notif.title || notif.project_title, notif.project_id)
} else if (notif.type === 'remixproject') {
text += templates.user(notif.actor_username)
text += ` remixed your project `
text += templates.project(notif.parent_title, notif.parent_id)
text += ` as `
text += templates.project(notif.title, notif.project_id)
} else if (notif.type === 'followuser') {
text += templates.user(notif.actor_username)
text += ` followed you`
} else if (notif.type === 'forumpost') {
text += `There are new posts on `
text += templates.forumThread(notif.topic_title, notif.topic_id)
} else if (notif.type === 'curatorinvite') {
text += templates.user(notif.actor_username)
text += ` invited you to curate the studio `
text += templates.studio(notif.title, notif.gallery_id)
} else if (notif.type === 'becomeownerstudio') {
text += templates.user(notif.actor_username)
text += ` promoted you to a manager of the studio `
console.log(notif)
text += templates.studio(notif.gallery_title, notif.gallery_id)
} else if (notif.type === 'studioactivity') {
text += `There is new activity in `
text += templates.studio(notif.title, notif.gallery_id)
} else {
text += `I'm not sure what kind of notification this is (${notif.type})`
}
const lastChar = text.endsWith('</a>') ? text[text.length - 5] : last(text)
if (lastChar !== '.') {
text += '.'
}
text += '</li>'
return text
}
}
const parseCookies = function(request) {
const list = {}
const rc = request.headers.cookie
if (rc) {
for (let cookie of rc.split(';')) {
const [ name, ...rest ] = cookie.split('=')
list[name.trim()] = decodeURI(rest.join('='))
}
}
return list
}
const getData = function(request) {
return new Promise((resolve, reject) => {
let body = ''
request.on('data', data => {
body += data
if (body.length > 1e6) {
request.connection.destroy()
reject('Too much data')
}
})
request.on('end', () => {
resolve(qs.parse(body))
})
})
}
const handleRequest = async (request, response) => {
const { pathname, query } = url.parse(request.url)
const queryData = qs.parse(query)
const cookie = parseCookies(request)
if (request.url === '/login') {
await page(request, response, fixWS`
<h1>Login</h1>
<form action="/post-login" method="post">
<p><label>Username: <input name="username"></label></p>
<p><label>Token: <input type="password" name="token"></label></p>
<p><label>Session ID: <input type="password" name="sessionid"></label></p>
<p><label>CSRF Token: <input type="password" name="csrftoken"></label></p>
<p><button>Login</button></p>
</form>
`)
return
}
if (request.url === '/post-login') {
const { username, token, sessionid, csrftoken } = await getData(request)
response.setHeader('Set-Cookie', [
`username=${username}; HttpOnly`,
`token=${token}; HttpOnly`,
`sessionid=${sessionid}; HttpOnly`,
`csrftoken=${csrftoken}; HttpOnly`
])
request.headers.cookie = response.getHeader('Set-Cookie').join(';') // Cheating! To make the header show right.
await page(request, response, fixWS`
<p>Okay, you're logged in.</p>
`)
return
}
if (request.url === '/logout') {
await page(request, response, fixWS`
<h1>Log Out</h1>
<form action="/post-logout" method="post">
<p>Are you sure you want to log out?</p>
<p><button>Log out</button></p>
</form>
`)
return
}
if (request.url === '/post-logout') {
const { username, token, sessionid, csrftoken } = await getData(request)
const clearCookie = name => `${name}=; expires=Thu, 01 Jan 1970 00:00:00 GMT`
request.headers.cookie = '' // Cheating, kind of, but to make the header print right :)
response.setHeader('Set-Cookie', ['username', 'token', 'sessionid', 'csrftoken'].map(clearCookie))
await page(request, response, fixWS`
<p>Okay, you've been logged out.</p>
`)
return
}
if (pathname === '/notifications') {
if (!cookie.username) {
await page(request, response, fixWS`
<p>Sorry, you can't view your notifications until you've <a href="/login">logged in</a>.</p>
`)
return
}
let { page: pageNumber = 1 } = queryData
pageNumber = parseInt(pageNumber)
if (isNaN(pageNumber)) {
pageNumber = 1
} else {
pageNumber = Math.max(1, pageNumber)
}
const notifications = await getNotifications(cookie.username, cookie.token, pageNumber)
const nText = arr => arr.map(n => templates.notification(n, cookie.username)).join('\n')
const notificationCount = await getMessageCount(cookie.username)
const currentPageNewCount = Math.max(notificationCount - (limit * (pageNumber - 1)), 0)
let listText = ''
if (currentPageNewCount > 0) {
listText += fixWS`
<h2>New notifications:</h2>
<ul>
${nText(notifications.slice(0, currentPageNewCount))}
</ul>
<form action="/mark-notifications-as-read" method="post">
<p><button>Mark as read</button></p>
</form>
`
}
listText += `
<h2>Read notifications:</h2>
<ul>
${nText(notifications.slice(currentPageNewCount))}
</ul>
`
await page(request, response, fixWS`
<h1>Notifications</h1>
${listText}
<p>You are on page ${pageNumber}.
${notifications.length === limit && `<a href="/notifications?page=${pageNumber + 1}">Next</a>`}
${pageNumber > 1 && `<a href="/notifications?page=${pageNumber - 1}">Previous</a>`}</p>
`)
return
}
if (pathname === '/mark-notifications-as-read') {
await markNotificationsAsRead(cookie.sessionid, cookie.csrftoken)
response.writeHead(302, {
'Location': '/notifications'
})
response.end()
return
}
const projectMatch = pathname.match(/^\/projects\/([0-9]*)\/?/)
if (projectMatch) {
const projectID = projectMatch[1]
const project = await getProject(projectID, cookie.token)
if (project.code === 'NotFound') {
await page(request, response, fixWS`
Sorry, that project either doesn't exist or isn't shared.
`)
return
}
await page(request, response, fixWS`
<h1>${project.title}</h1>
<p><img src="${project.image}" alt="The thumbnail for this project"></p>
<p><a href="https://projects.scratch.mit.edu/${project.id}">Download!</a></p>
${project.instructions ? fixWS`
<h2>Instructions</h2>
${templates.longField(project.instructions)}
` : fixWS`
<p>(No instructions.)</p>
`}
${project.description ? fixWS`
<h2>Notes and Credits</h2>
${templates.longField(project.description)}
` : fixWS`
<p>(No notes and credits.)</p>
`}
`)
return
}
const userMatch = pathname.match(/^\/users\/([a-zA-Z0-9\-_]*)\/?/)
if (userMatch) {
const username = userMatch[1]
const user = await getUser(username)
if (username.code === 'NotFound') {
await page(request, response, fixWS`
Sorry, that user doesn't exist.
`)
return
}
await page(request, response, fixWS`
<h1><img src="${user.profile.images['60x60']}" height="60px" alt="This user's profile picture"> ${user.username}</h1>
${user.profile.bio ? fixWS`
<h2>About Me</h2>
${templates.longField(user.profile.bio)}
` : fixWS`
<p>(No "about me".)</p>
`}
${user.profile.status ? fixWS`
<h2>What I'm Working On</h2>
${templates.longField(user.profile.status)}
` : fixWS`
<p>(No "what I'm working on".)</p>
`}
`)
return
}
if (pathname === '/style.css') {
response.writeHead(200, {
'Content-Type': 'text/css'
})
response.end(await readFile('style.css'))
return
}
if (pathname === '/') {
await page(request, response, fixWS`
You are at the homepage. Sorry, I haven't implmented any content for it yet.
`)
}
await page(request, response, fixWS`
404. Sorry, I'm not sure where you are right now.
`)
}
const server = http.createServer((request, response) => {
handleRequest(request, response).catch(error => {
console.error(error)
return page(request, response, fixWS`
500. Sorry, there was an internal server error.
`)
})
})
server.listen(8000)
console.log('Go!')
|
