HackMD/lib/response.js

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'use strict'
// response
// external modules
var fs = require('fs')
var markdownpdf = require('markdown-pdf')
var LZString = require('lz-string')
var shortId = require('shortid')
var querystring = require('querystring')
var request = require('request')
var moment = require('moment')
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// core
var config = require('./config')
var logger = require('./logger')
var models = require('./models')
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var utils = require('./utils')
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// public
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var response = {
errorForbidden: function (res) {
responseError(res, '403', 'Forbidden', 'oh no.')
},
errorNotFound: function (res) {
responseError(res, '404', 'Not Found', 'oops.')
},
errorBadRequest: function (res) {
responseError(res, '400', 'Bad Request', 'something not right.')
},
errorInternalError: function (res) {
responseError(res, '500', 'Internal Error', 'wtf.')
},
errorServiceUnavailable: function (res) {
res.status(503).send("I'm busy right now, try again later.")
},
newNote: newNote,
showNote: showNote,
showPublishNote: showPublishNote,
showPublishSlide: showPublishSlide,
showIndex: showIndex,
noteActions: noteActions,
publishNoteActions: publishNoteActions,
publishSlideActions: publishSlideActions,
githubActions: githubActions,
gitlabActions: gitlabActions
}
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function responseError (res, code, detail, msg) {
res.status(code).render(config.errorpath, {
url: config.serverurl,
title: code + ' ' + detail + ' ' + msg,
code: code,
detail: detail,
msg: msg,
useCDN: config.usecdn
})
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}
function showIndex (req, res, next) {
res.render(config.indexpath, {
url: config.serverurl,
useCDN: config.usecdn,
allowAnonymous: config.allowanonymous,
allowAnonymousEdits: config.allowanonymousedits,
facebook: config.isFacebookEnable,
twitter: config.isTwitterEnable,
github: config.isGitHubEnable,
gitlab: config.isGitLabEnable,
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mattermost: config.isMattermostEnable,
dropbox: config.isDropboxEnable,
google: config.isGoogleEnable,
ldap: config.isLDAPEnable,
saml: config.isSAMLEnable,
email: config.isEmailEnable,
allowemailregister: config.allowemailregister,
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allowpdfexport: config.allowpdfexport,
signin: req.isAuthenticated(),
infoMessage: req.flash('info'),
errorMessage: req.flash('error')
})
}
function responseHackMD (res, note) {
var body = note.content
var extracted = models.Note.extractMeta(body)
var meta = models.Note.parseMeta(extracted.meta)
var title = models.Note.decodeTitle(note.title)
title = models.Note.generateWebTitle(meta.title || title)
res.set({
'Cache-Control': 'private', // only cache by client
'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
})
res.render(config.hackmdpath, {
url: config.serverurl,
title: title,
useCDN: config.usecdn,
allowAnonymous: config.allowanonymous,
allowAnonymousEdits: config.allowanonymousedits,
facebook: config.isFacebookEnable,
twitter: config.isTwitterEnable,
github: config.isGitHubEnable,
gitlab: config.isGitLabEnable,
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mattermost: config.isMattermostEnable,
dropbox: config.isDropboxEnable,
google: config.isGoogleEnable,
ldap: config.isLDAPEnable,
saml: config.isSAMLEnable,
email: config.isEmailEnable,
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allowemailregister: config.allowemailregister,
allowpdfexport: config.allowpdfexport
})
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}
function newNote (req, res, next) {
var owner = null
if (req.isAuthenticated()) {
owner = req.user.id
} else if (!config.allowanonymous) {
return response.errorForbidden(res)
}
models.Note.create({
ownerId: owner,
alias: req.alias ? req.alias : null,
content: req.body ? req.body : ''
}).then(function (note) {
return res.redirect(config.serverurl + '/' + LZString.compressToBase64(note.id))
}).catch(function (err) {
logger.error(err)
return response.errorInternalError(res)
})
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}
function checkViewPermission (req, note) {
if (note.permission === 'private') {
if (!req.isAuthenticated() || note.ownerId !== req.user.id) { return false } else { return true }
} else if (note.permission === 'limited' || note.permission === 'protected') {
if (!req.isAuthenticated()) { return false } else { return true }
} else {
return true
}
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}
function findNote (req, res, callback, include) {
var noteId = req.params.noteId
var id = req.params.noteId || req.params.shortid
models.Note.parseNoteId(id, function (err, _id) {
if (err) {
logger.log(err)
}
models.Note.findOne({
where: {
id: _id
},
include: include || null
}).then(function (note) {
if (!note) {
if (config.allowfreeurl && noteId) {
req.alias = noteId
return newNote(req, res)
} else {
return response.errorNotFound(res)
}
}
if (!checkViewPermission(req, note)) {
return response.errorForbidden(res)
} else {
return callback(note)
}
}).catch(function (err) {
logger.error(err)
return response.errorInternalError(res)
})
})
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}
function showNote (req, res, next) {
findNote(req, res, function (note) {
// force to use note id
var noteId = req.params.noteId
var id = LZString.compressToBase64(note.id)
if ((note.alias && noteId !== note.alias) || (!note.alias && noteId !== id)) { return res.redirect(config.serverurl + '/' + (note.alias || id)) }
return responseHackMD(res, note)
})
}
function showPublishNote (req, res, next) {
var include = [{
model: models.User,
as: 'owner'
}, {
model: models.User,
as: 'lastchangeuser'
}]
findNote(req, res, function (note) {
// force to use short id
var shortid = req.params.shortid
if ((note.alias && shortid !== note.alias) || (!note.alias && shortid !== note.shortid)) {
return res.redirect(config.serverurl + '/s/' + (note.alias || note.shortid))
}
note.increment('viewcount').then(function (note) {
if (!note) {
return response.errorNotFound(res)
}
var body = note.content
var extracted = models.Note.extractMeta(body)
var markdown = extracted.markdown
var meta = models.Note.parseMeta(extracted.meta)
var createtime = note.createdAt
var updatetime = note.lastchangeAt
var title = models.Note.decodeTitle(note.title)
title = models.Note.generateWebTitle(meta.title || title)
var origin = config.serverurl
var data = {
title: title,
description: meta.description || (markdown ? models.Note.generateDescription(markdown) : null),
viewcount: note.viewcount,
createtime: createtime,
updatetime: updatetime,
url: origin,
body: body,
useCDN: config.usecdn,
owner: note.owner ? note.owner.id : null,
ownerprofile: note.owner ? models.User.getProfile(note.owner) : null,
lastchangeuser: note.lastchangeuser ? note.lastchangeuser.id : null,
lastchangeuserprofile: note.lastchangeuser ? models.User.getProfile(note.lastchangeuser) : null,
robots: meta.robots || false, // default allow robots
GA: meta.GA,
disqus: meta.disqus
}
return renderPublish(data, res)
}).catch(function (err) {
logger.error(err)
return response.errorInternalError(res)
})
}, include)
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}
function renderPublish (data, res) {
res.set({
'Cache-Control': 'private' // only cache by client
})
res.render(config.prettypath, data)
}
function actionPublish (req, res, note) {
res.redirect(config.serverurl + '/s/' + (note.alias || note.shortid))
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}
function actionSlide (req, res, note) {
res.redirect(config.serverurl + '/p/' + (note.alias || note.shortid))
}
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function actionDownload (req, res, note) {
var body = note.content
var title = models.Note.decodeTitle(note.title)
var filename = title
filename = encodeURIComponent(filename)
res.set({
'Access-Control-Allow-Origin': '*', // allow CORS as API
'Access-Control-Allow-Headers': 'Range',
'Access-Control-Expose-Headers': 'Cache-Control, Content-Encoding, Content-Range',
'Content-Type': 'text/markdown; charset=UTF-8',
'Cache-Control': 'private',
'Content-disposition': 'attachment; filename=' + filename + '.md',
'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
})
res.send(body)
}
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function actionInfo (req, res, note) {
var body = note.content
var extracted = models.Note.extractMeta(body)
var markdown = extracted.markdown
var meta = models.Note.parseMeta(extracted.meta)
var createtime = note.createdAt
var updatetime = note.lastchangeAt
var title = models.Note.decodeTitle(note.title)
var data = {
title: meta.title || title,
description: meta.description || (markdown ? models.Note.generateDescription(markdown) : null),
viewcount: note.viewcount,
createtime: createtime,
updatetime: updatetime
}
res.set({
'Access-Control-Allow-Origin': '*', // allow CORS as API
'Access-Control-Allow-Headers': 'Range',
'Access-Control-Expose-Headers': 'Cache-Control, Content-Encoding, Content-Range',
'Cache-Control': 'private', // only cache by client
'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
})
res.send(data)
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}
function actionPDF (req, res, note) {
var body = note.content
var extracted = models.Note.extractMeta(body)
var title = models.Note.decodeTitle(note.title)
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if (!fs.existsSync(config.tmppath)) {
fs.mkdirSync(config.tmppath)
}
var path = config.tmppath + '/' + Date.now() + '.pdf'
markdownpdf().from.string(extracted.markdown).to(path, function () {
var stream = fs.createReadStream(path)
var filename = title
// Be careful of special characters
filename = encodeURIComponent(filename)
// Ideally this should strip them
res.setHeader('Content-disposition', 'attachment; filename="' + filename + '.pdf"')
res.setHeader('Cache-Control', 'private')
res.setHeader('Content-Type', 'application/pdf; charset=UTF-8')
res.setHeader('X-Robots-Tag', 'noindex, nofollow') // prevent crawling
stream.pipe(res)
fs.unlink(path)
})
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}
function actionGist (req, res, note) {
var data = {
client_id: config.github.clientID,
redirect_uri: config.serverurl + '/auth/github/callback/' + LZString.compressToBase64(note.id) + '/gist',
scope: 'gist',
state: shortId.generate()
}
var query = querystring.stringify(data)
res.redirect('https://github.com/login/oauth/authorize?' + query)
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}
function actionRevision (req, res, note) {
var actionId = req.params.actionId
if (actionId) {
var time = moment(parseInt(actionId))
if (time.isValid()) {
models.Revision.getPatchedNoteRevisionByTime(note, time, function (err, content) {
if (err) {
logger.error(err)
return response.errorInternalError(res)
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}
if (!content) {
return response.errorNotFound(res)
}
res.set({
'Access-Control-Allow-Origin': '*', // allow CORS as API
'Access-Control-Allow-Headers': 'Range',
'Access-Control-Expose-Headers': 'Cache-Control, Content-Encoding, Content-Range',
'Cache-Control': 'private', // only cache by client
'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
})
res.send(content)
})
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} else {
return response.errorNotFound(res)
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}
} else {
models.Revision.getNoteRevisions(note, function (err, data) {
if (err) {
logger.error(err)
return response.errorInternalError(res)
}
var out = {
revision: data
}
res.set({
'Access-Control-Allow-Origin': '*', // allow CORS as API
'Access-Control-Allow-Headers': 'Range',
'Access-Control-Expose-Headers': 'Cache-Control, Content-Encoding, Content-Range',
'Cache-Control': 'private', // only cache by client
'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
})
res.send(out)
})
}
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}
function noteActions (req, res, next) {
var noteId = req.params.noteId
findNote(req, res, function (note) {
var action = req.params.action
switch (action) {
case 'publish':
case 'pretty': // pretty deprecated
actionPublish(req, res, note)
break
case 'slide':
actionSlide(req, res, note)
break
case 'download':
actionDownload(req, res, note)
break
case 'info':
actionInfo(req, res, note)
break
case 'pdf':
if (config.allowpdfexport) {
actionPDF(req, res, note)
} else {
logger.error('PDF export failed: Disabled by config. Set "allowpdfexport: true" to enable. Check the documentation for details')
response.errorForbidden(res)
}
break
case 'gist':
actionGist(req, res, note)
break
case 'revision':
actionRevision(req, res, note)
break
default:
return res.redirect(config.serverurl + '/' + noteId)
}
})
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}
function publishNoteActions (req, res, next) {
findNote(req, res, function (note) {
var action = req.params.action
switch (action) {
case 'edit':
res.redirect(config.serverurl + '/' + (note.alias ? note.alias : LZString.compressToBase64(note.id)))
break
default:
res.redirect(config.serverurl + '/s/' + note.shortid)
break
}
})
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}
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function publishSlideActions (req, res, next) {
findNote(req, res, function (note) {
var action = req.params.action
switch (action) {
case 'edit':
res.redirect(config.serverurl + '/' + (note.alias ? note.alias : LZString.compressToBase64(note.id)))
break
default:
res.redirect(config.serverurl + '/p/' + note.shortid)
break
}
})
}
function githubActions (req, res, next) {
var noteId = req.params.noteId
findNote(req, res, function (note) {
var action = req.params.action
switch (action) {
case 'gist':
githubActionGist(req, res, note)
break
default:
res.redirect(config.serverurl + '/' + noteId)
break
}
})
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}
function githubActionGist (req, res, note) {
var code = req.query.code
var state = req.query.state
if (!code || !state) {
return response.errorForbidden(res)
} else {
var data = {
client_id: config.github.clientID,
client_secret: config.github.clientSecret,
code: code,
state: state
}
var authUrl = 'https://github.com/login/oauth/access_token'
request({
url: authUrl,
method: 'POST',
json: data
}, function (error, httpResponse, body) {
if (!error && httpResponse.statusCode === 200) {
var accessToken = body.access_token
if (accessToken) {
var content = note.content
var title = models.Note.decodeTitle(note.title)
var filename = title.replace('/', ' ') + '.md'
var gist = {
'files': {}
}
gist.files[filename] = {
'content': content
}
var gistUrl = 'https://api.github.com/gists'
request({
url: gistUrl,
headers: {
'User-Agent': 'HackMD',
'Authorization': 'token ' + accessToken
},
method: 'POST',
json: gist
}, function (error, httpResponse, body) {
if (!error && httpResponse.statusCode === 201) {
res.setHeader('referer', '')
res.redirect(body.html_url)
} else {
return response.errorForbidden(res)
}
})
} else {
return response.errorForbidden(res)
}
} else {
return response.errorForbidden(res)
}
})
}
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}
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function gitlabActions (req, res, next) {
var noteId = req.params.noteId
findNote(req, res, function (note) {
var action = req.params.action
switch (action) {
case 'projects':
gitlabActionProjects(req, res, note)
break
default:
res.redirect(config.serverurl + '/' + noteId)
break
}
})
}
function gitlabActionProjects (req, res, note) {
if (req.isAuthenticated()) {
models.User.findOne({
where: {
id: req.user.id
}
}).then(function (user) {
if (!user) { return response.errorNotFound(res) }
var ret = { baseURL: config.gitlab.baseURL }
ret.accesstoken = user.accessToken
ret.profileid = user.profileid
request(
config.gitlab.baseURL + '/api/v3/projects?access_token=' + user.accessToken,
function (error, httpResponse, body) {
if (!error && httpResponse.statusCode === 200) {
ret.projects = JSON.parse(body)
return res.send(ret)
} else {
return res.send(ret)
}
}
)
}).catch(function (err) {
logger.error('gitlab action projects failed: ' + err)
return response.errorInternalError(res)
})
} else {
return response.errorForbidden(res)
}
}
function showPublishSlide (req, res, next) {
var include = [{
model: models.User,
as: 'owner'
}, {
model: models.User,
as: 'lastchangeuser'
}]
findNote(req, res, function (note) {
// force to use short id
var shortid = req.params.shortid
if ((note.alias && shortid !== note.alias) || (!note.alias && shortid !== note.shortid)) { return res.redirect(config.serverurl + '/p/' + (note.alias || note.shortid)) }
note.increment('viewcount').then(function (note) {
if (!note) {
return response.errorNotFound(res)
}
var body = note.content
var extracted = models.Note.extractMeta(body)
var markdown = extracted.markdown
var meta = models.Note.parseMeta(extracted.meta)
var createtime = note.createdAt
var updatetime = note.lastchangeAt
var title = models.Note.decodeTitle(note.title)
title = models.Note.generateWebTitle(meta.title || title)
var origin = config.serverurl
var data = {
title: title,
description: meta.description || (markdown ? models.Note.generateDescription(markdown) : null),
viewcount: note.viewcount,
createtime: createtime,
updatetime: updatetime,
url: origin,
body: markdown,
theme: meta.slideOptions && utils.isRevealTheme(meta.slideOptions.theme),
meta: JSON.stringify(extracted.meta),
useCDN: config.usecdn,
owner: note.owner ? note.owner.id : null,
ownerprofile: note.owner ? models.User.getProfile(note.owner) : null,
lastchangeuser: note.lastchangeuser ? note.lastchangeuser.id : null,
lastchangeuserprofile: note.lastchangeuser ? models.User.getProfile(note.lastchangeuser) : null,
robots: meta.robots || false, // default allow robots
GA: meta.GA,
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disqus: meta.disqus,
cspNonce: res.locals.nonce
}
return renderPublishSlide(data, res)
}).catch(function (err) {
logger.error(err)
return response.errorInternalError(res)
})
}, include)
}
function renderPublishSlide (data, res) {
res.set({
'Cache-Control': 'private' // only cache by client
})
res.render(config.slidepath, data)
}
module.exports = response