HackMD/lib/response.js
2015-12-30 00:33:36 -05:00

455 lines
15 KiB
JavaScript

//response
//external modules
var ejs = require('ejs');
var fs = require('fs');
var path = require('path');
var uuid = require('node-uuid');
var markdownpdf = require("markdown-pdf");
var LZString = require('lz-string');
var S = require('string');
var shortId = require('shortid');
//core
var config = require("../config.js");
//others
var db = require("./db.js");
var Note = require("./note.js");
//slides
var md = require('reveal.js/plugin/markdown/markdown');
var Mustache = require('mustache');
//reveal.js
var opts = {
userBasePath: process.cwd(),
revealBasePath: path.resolve(require.resolve('reveal.js'), '..', '..'),
template: fs.readFileSync(path.join('.', '/public/views/slide', 'reveal.hbs')).toString(),
templateListing: fs.readFileSync(path.join('.', '/public/views/slide', 'listing.hbs')).toString(),
theme: 'css/theme/black.css',
highlightTheme: 'zenburn',
separator: '^(\r\n?|\n)---(\r\n?|\n)$',
verticalSeparator: '^(\r\n?|\n)----(\r\n?|\n)$',
revealOptions: {}
};
//public
var response = {
errorForbidden: function (res) {
responseError(res, "403", "Forbidden", "oh no.");
},
errorNotFound: function (res) {
responseError(res, "404", "Not Found", "oops.");
},
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,
showFeatures: showFeatures,
showNote: showNote,
showPublishNote: showPublishNote,
showPublishSlide: showPublishSlide,
showIndex: showIndex,
noteActions: noteActions,
publishNoteActions: publishNoteActions
};
function responseError(res, code, detail, msg) {
res.writeHead(code, {
'Content-Type': 'text/html'
});
var template = config.errorpath;
var content = ejs.render(fs.readFileSync(template, 'utf8'), {
title: code + ' ' + detail + ' ' + msg,
cache: !config.debug,
filename: template,
code: code,
detail: detail,
msg: msg,
useCDN: config.usecdn
});
res.write(content);
res.end();
}
function showIndex(req, res, next) {
res.writeHead(200, {
'Content-Type': 'text/html'
});
var template = config.indexpath;
var content = ejs.render(fs.readFileSync(template, 'utf8'), {
useCDN: config.usecdn
});
res.write(content);
res.end();
}
function responseHackMD(res, noteId) {
if (noteId != config.featuresnotename) {
if (!Note.checkNoteIdValid(noteId)) {
responseError(res, "404", "Not Found", "oops.");
return;
}
noteId = LZString.decompressFromBase64(noteId);
if (!noteId) {
responseError(res, "404", "Not Found", "oops.");
return;
}
}
db.readFromDB(noteId, function (err, data) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var title = data.rows[0].title;
var decodedTitle = LZString.decompressFromBase64(title);
if (decodedTitle) title = decodedTitle;
title = Note.generateWebTitle(title);
var template = config.hackmdpath;
var options = {
cache: !config.debug,
filename: template
};
var compiled = ejs.compile(fs.readFileSync(template, 'utf8'), options);
var html = compiled({
title: title,
useCDN: config.usecdn
});
var buf = html;
res.writeHead(200, {
'Content-Type': 'text/html; charset=UTF-8',
'Cache-Control': 'private',
'Content-Length': buf.length
});
res.end(buf);
});
}
function newNote(req, res, next) {
var newId = uuid.v4();
var body = fs.readFileSync(config.defaultnotepath, 'utf8');
body = LZString.compressToBase64(body);
var owner = null;
if (req.isAuthenticated()) {
owner = req.session.passport.user;
}
db.newToDB(newId, owner, body, function (err, result) {
if (err) {
responseError(res, "500", "Internal Error", "wtf.");
return;
}
res.redirect("/" + LZString.compressToBase64(newId));
});
}
function showFeatures(req, res, next) {
db.readFromDB(config.featuresnotename, function (err, data) {
if (err) {
var body = fs.readFileSync(config.defaultfeaturespath, 'utf8');
body = LZString.compressToBase64(body);
db.newToDB(config.featuresnotename, null, body, function (err, result) {
if (err) {
responseError(res, "500", "Internal Error", "wtf.");
return;
}
responseHackMD(res, config.featuresnotename);
});
} else {
responseHackMD(res, config.featuresnotename);
}
});
}
function showNote(req, res, next) {
var noteId = req.params.noteId;
if (!Note.checkNoteIdValid(noteId)) {
responseError(res, "404", "Not Found", "oops.");
return;
}
responseHackMD(res, noteId);
}
function showPublishNote(req, res, next) {
var shortid = req.params.shortid;
if (shortId.isValid(shortid)) {
Note.findNote(shortid, function (err, note) {
if (err || !note) {
responseError(res, "404", "Not Found", "oops.");
return;
}
//increase note viewcount
Note.increaseViewCount(note, function (err, note) {
if (err || !note) {
responseError(res, "404", "Not Found", "oops.");
return;
}
db.readFromDB(note.id, function (err, data) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var body = LZString.decompressFromBase64(data.rows[0].content);
var updatetime = data.rows[0].update_time;
var text = S(body).escapeHTML().s;
var title = data.rows[0].title;
var decodedTitle = LZString.decompressFromBase64(title);
if (decodedTitle) title = decodedTitle;
title = Note.generateWebTitle(title);
var template = config.prettypath;
var options = {
cache: !config.debug,
filename: template
};
var compiled = ejs.compile(fs.readFileSync(template, 'utf8'), options);
var origin = config.getserverurl();
var html = compiled({
title: title,
viewcount: note.viewcount,
updatetime: updatetime,
url: origin,
body: text,
useCDN: config.usecdn
});
var buf = html;
res.writeHead(200, {
'Content-Type': 'text/html; charset=UTF-8',
'Cache-Control': 'private',
'Content-Length': buf.length
});
res.end(buf);
});
});
});
} else {
responseError(res, "404", "Not Found", "oops.");
}
}
function actionPublish(req, res, noteId) {
db.readFromDB(noteId, function (err, data) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var owner = data.rows[0].owner;
var permission = "freely";
if (owner && owner != "null") {
permission = "editable";
}
Note.findOrNewNote(noteId, permission, function (err, note) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
res.redirect("/s/" + note.shortid);
});
});
}
function actionSlide(req, res, noteId) {
db.readFromDB(noteId, function (err, data) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var owner = data.rows[0].owner;
var permission = "freely";
if (owner && owner != "null") {
permission = "editable";
}
Note.findOrNewNote(noteId, permission, function (err, note) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
res.redirect("/p/" + note.shortid);
});
});
}
//pretty api is deprecated
function actionPretty(req, res, noteId) {
db.readFromDB(noteId, function (err, data) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var body = LZString.decompressFromBase64(data.rows[0].content);
var text = S(body).escapeHTML().s;
var title = data.rows[0].title;
var decodedTitle = LZString.decompressFromBase64(title);
if (decodedTitle) title = decodedTitle;
title = Note.generateWebTitle(title);
var template = config.prettypath;
var compiled = ejs.compile(fs.readFileSync(template, 'utf8'));
var origin = config.getserverurl();
var html = compiled({
title: title,
url: origin,
body: text
});
var buf = html;
res.writeHead(200, {
'Content-Type': 'text/html; charset=UTF-8',
'Cache-Control': 'private',
'Content-Length': buf.length
});
res.end(buf);
});
}
function actionDownload(req, res, noteId) {
db.readFromDB(noteId, function (err, data) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var body = LZString.decompressFromBase64(data.rows[0].content);
var title = Note.getNoteTitle(body);
res.writeHead(200, {
'Content-Type': 'text/markdown; charset=UTF-8',
'Cache-Control': 'private',
'Content-disposition': 'attachment; filename=' + title + '.md',
'Content-Length': body.length
});
res.end(body);
});
}
function actionPDF(req, res, noteId) {
db.readFromDB(noteId, function (err, data) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var body = LZString.decompressFromBase64(data.rows[0].content);
var title = Note.getNoteTitle(body);
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');
stream.pipe(res);
fs.unlink(path);
});
});
}
function noteActions(req, res, next) {
var noteId = req.params.noteId;
if (noteId != config.featuresnotename) {
if (!Note.checkNoteIdValid(noteId)) {
responseError(res, "404", "Not Found", "oops.");
return;
}
noteId = LZString.decompressFromBase64(noteId);
if (!noteId) {
responseError(res, "404", "Not Found", "oops.");
return;
}
}
var action = req.params.action;
switch (action) {
case "publish":
case "pretty": //pretty deprecated
actionPublish(req, res, noteId);
break;
case "slide":
actionSlide(req, res, noteId);
break;
case "download":
actionDownload(req, res, noteId);
break;
case "pdf":
actionPDF(req, res, noteId);
break;
default:
if (noteId != config.featuresnotename)
res.redirect('/' + LZString.compressToBase64(noteId));
else
res.redirect('/' + noteId);
break;
}
}
function publishNoteActions(req, res, next) {
var action = req.params.action;
switch (action) {
case "edit":
var shortid = req.params.shortid;
if (shortId.isValid(shortid)) {
Note.findNote(shortid, function (err, note) {
if (err || !note) {
responseError(res, "404", "Not Found", "oops.");
return;
}
if (note.id != config.featuresnotename)
res.redirect('/' + LZString.compressToBase64(note.id));
else
res.redirect('/' + note.id);
});
}
break;
}
}
function showPublishSlide(req, res, next) {
var shortid = req.params.shortid;
if (shortId.isValid(shortid)) {
Note.findNote(shortid, function (err, note) {
if (err || !note) {
responseError(res, "404", "Not Found", "oops.");
return;
}
//increase note viewcount
Note.increaseViewCount(note, function (err, note) {
if (err || !note) {
responseError(res, "404", "Not Found", "oops.");
return;
}
db.readFromDB(note.id, function (err, data) {
if (err) {
responseError(res, "404", "Not Found", "oops.");
return;
}
var body = LZString.decompressFromBase64(data.rows[0].content);
var title = data.rows[0].title;
var decodedTitle = LZString.decompressFromBase64(title);
if (decodedTitle) title = decodedTitle;
title = Note.generateWebTitle(title);
var text = S(body).escapeHTML().s;
render(res, title, text);
});
});
});
} else {
responseError(res, "404", "Not Found", "oops.");
}
}
//reveal.js render
var render = function (res, title, markdown) {
var slides = md.slidify(markdown, opts);
res.end(Mustache.to_html(opts.template, {
title: title,
theme: opts.theme,
highlightTheme: opts.highlightTheme,
slides: slides,
options: JSON.stringify(opts.revealOptions, null, 2)
}));
};
module.exports = response;