HackMD/lib/response.js

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//response
//external modules
var fs = require('fs');
var path = require('path');
var markdownpdf = require("markdown-pdf");
var LZString = require('lz-string');
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var S = require('string');
var shortId = require('shortid');
var metaMarked = require('meta-marked');
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var querystring = require('querystring');
var request = require('request');
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var moment = require('moment');
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//core
var config = require("./config.js");
var logger = require("./logger.js");
var models = require("./models");
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//slides
var md = require('reveal.js/plugin/markdown/markdown');
//reveal.js
var slideOptions = {
separator: '^(\r\n?|\n)---(\r\n?|\n)$',
verticalSeparator: '^(\r\n?|\n)----(\r\n?|\n)$'
};
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//public
var response = {
errorForbidden: function (res) {
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responseError(res, "403", "Forbidden", "oh no.");
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},
errorNotFound: function (res) {
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responseError(res, "404", "Not Found", "oops.");
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},
errorBadRequest: function (res) {
responseError(res, "400", "Bad Request", "something not right.");
},
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errorInternalError: function (res) {
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responseError(res, "500", "Internal Error", "wtf.");
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},
errorServiceUnavailable: function (res) {
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res.status(503).send("I'm busy right now, try again later.");
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},
newNote: newNote,
showNote: showNote,
showPublishNote: showPublishNote,
showPublishSlide: showPublishSlide,
showIndex: showIndex,
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noteActions: noteActions,
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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,
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title: code + ' ' + detail + ' ' + msg,
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code: code,
detail: detail,
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msg: msg,
useCDN: config.usecdn
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});
}
function showIndex(req, res, next) {
res.render(config.indexpath, {
url: config.serverurl,
useCDN: config.usecdn,
facebook: config.facebook,
twitter: config.twitter,
github: config.github,
gitlab: config.gitlab,
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dropbox: config.dropbox,
google: config.google,
signin: req.isAuthenticated()
});
}
function responseHackMD(res, note) {
var body = LZString.decompressFromBase64(note.content);
var meta = null;
try {
meta = models.Note.parseMeta(metaMarked(body).meta);
} catch(err) {
//na
}
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if (!meta) 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,
facebook: config.facebook,
twitter: config.twitter,
github: config.github,
gitlab: config.gitlab,
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dropbox: config.dropbox,
google: config.google
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});
}
function newNote(req, res, next) {
var owner = null;
if (req.isAuthenticated()) {
owner = req.user.id;
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}
models.Note.create({
ownerId: owner
}).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 {
return true;
}
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}
function findNote(req, res, callback, include) {
var id = req.params.noteId || req.params.shortid;
models.Note.parseNoteId(id, function (err, _id) {
models.Note.findOne({
where: {
id: _id
},
include: include || null
}).then(function (note) {
if (!note) {
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);
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}
var body = LZString.decompressFromBase64(note.content);
var meta = null;
try {
meta = models.Note.parseMeta(metaMarked(body).meta);
} catch(err) {
//na
}
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if (!meta) meta = {};
var createtime = note.createdAt;
var updatetime = note.lastchangeAt;
var text = S(body).escapeHTML().s;
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,
viewcount: note.viewcount,
createtime: createtime,
updatetime: updatetime,
url: origin,
body: text,
useCDN: config.usecdn,
owner: note.owner ? note.owner.id : null,
ownerprofile: note.owner ? models.User.parseProfile(note.owner.profile) : null,
lastchangeuser: note.lastchangeuser ? note.lastchangeuser.id : null,
lastchangeuserprofile: note.lastchangeuser ? models.User.parseProfile(note.lastchangeuser.profile) : 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);
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});
}, 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 = LZString.decompressFromBase64(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
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});
res.send(body);
}
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function actionInfo(req, res, note) {
var body = LZString.decompressFromBase64(note.content);
var meta = null;
try {
meta = models.Note.parseMeta(metaMarked(body).meta);
} catch(err) {
//na
}
if (!meta) meta = {};
var createtime = note.createdAt;
var updatetime = note.lastchangeAt;
var text = S(body).escapeHTML().s;
var title = models.Note.decodeTitle(note.title);
var data = {
title: meta.title || title,
description: meta.description,
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
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'X-Robots-Tag': 'noindex, nofollow' // prevent crawling
});
res.send(data);
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}
function actionPDF(req, res, note) {
var body = LZString.decompressFromBase64(note.content);
try {
body = metaMarked(body).markdown;
} catch(err) {
//na
}
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(body).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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}
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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);
}
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);
}
} 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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});
}
}
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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;
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case "info":
actionInfo(req, res, note);
break;
case "pdf":
actionPDF(req, res, note);
break;
case "gist":
actionGist(req, res, note);
break;
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case "revision":
actionRevision(req, res, note);
break;
default:
return res.redirect(config.serverurl + '/' + noteId);
break;
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}
});
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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;
}
});
}
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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
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}
var auth_url = 'https://github.com/login/oauth/access_token';
request({
url: auth_url,
method: "POST",
json: data
}, function (error, httpResponse, body) {
if (!error && httpResponse.statusCode == 200) {
var access_token = body.access_token;
if (access_token) {
var content = LZString.decompressFromBase64(note.content);
var title = models.Note.decodeTitle(note.title);
var filename = title.replace('/', ' ') + '.md';
var gist = {
"files": {}
};
gist.files[filename] = {
"content": content
};
var gist_url = "https://api.github.com/gists";
request({
url: gist_url,
headers: {
'User-Agent': 'HackMD',
'Authorization': 'token ' + access_token
},
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);
}
});
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} 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 = LZString.decompressFromBase64(note.content);
var meta = null;
try {
var obj = metaMarked(body);
body = obj.markdown;
meta = models.Note.parseMeta(obj.meta);
} catch(err) {
//na
}
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if (!meta) meta = {};
var createtime = note.createdAt;
var updatetime = note.lastchangeAt;
var text = S(body).escapeHTML().s;
var title = models.Note.decodeTitle(note.title);
title = models.Note.generateWebTitle(meta.title || title);
var slides = md.slidify(text, slideOptions);
var origin = config.serverurl;
var data = {
title: title,
description: meta.description,
viewcount: note.viewcount,
createtime: createtime,
updatetime: updatetime,
url: origin,
slides: slides,
meta: JSON.stringify(obj.meta || {}),
useCDN: config.usecdn,
owner: note.owner ? note.owner.id : null,
ownerprofile: note.owner ? models.User.parseProfile(note.owner.profile) : null,
lastchangeuser: note.lastchangeuser ? note.lastchangeuser.id : null,
lastchangeuserprofile: note.lastchangeuser ? models.User.parseProfile(note.lastchangeuser.profile) : null,
robots: meta.robots || false, //default allow robots
GA: meta.GA,
disqus: meta.disqus
};
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;