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//note
//external modules
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var LZString = require('lz-string');
var marked = require('marked');
var cheerio = require('cheerio');
var shortId = require('shortid');
//others
var db = require("./db.js");
var logger = require("./logger.js");
//permission types
permissionTypes = ["freely", "editable", "locked", "private"];
// create a note model
var model = mongoose.model('note', {
id: String,
shortid: {
type: String,
unique: true,
default: shortId.generate
},
permission: {
type: String,
enum: permissionTypes
},
lastchangeuser: {
type: Schema.Types.ObjectId,
ref: 'user'
},
viewcount: {
type: Number,
default: 0
},
updated: Date,
created: Date
});
//public
var note = {
model: model,
findNote: findNote,
newNote: newNote,
findOrNewNote: findOrNewNote,
checkNoteIdValid: checkNoteIdValid,
checkNoteExist: checkNoteExist,
getNoteTitle: getNoteTitle,
generateWebTitle: generateWebTitle,
increaseViewCount: increaseViewCount,
updatePermission: updatePermission,
updateLastChangeUser: updateLastChangeUser
};
function checkNoteIdValid(noteId) {
try {
//logger.info(noteId);
var id = LZString.decompressFromBase64(noteId);
if (!id) return false;
var uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
var result = id.match(uuidRegex);
if (result && result.length == 1)
return true;
else
return false;
} catch (err) {
logger.error(err);
return false;
}
}
function checkNoteExist(noteId) {
try {
//logger.info(noteId);
var id = LZString.decompressFromBase64(noteId);
db.readFromDB(id, function (err, result) {
if (err) return false;
return true;
});
} catch (err) {
logger.error(err);
return false;
}
}
//get title
function getNoteTitle(body) {
var $ = cheerio.load(marked(body));
var h1s = $("h1");
var title = "";
if (h1s.length > 0 && h1s.first().text().split('\n').length == 1)
title = h1s.first().text();
else
title = "Untitled";
return title;
}
//generate note web page title
function generateWebTitle(title) {
title = !title || title == "Untitled" ? "HackMD - Collaborative notes" : title + " - HackMD";
return title;
}
function findNote(id, callback) {
model.findOne({
$or: [
{
id: id
},
{
shortid: id
}
]
}, function (err, note) {
if (err) {
logger.error('find note failed: ' + err);
callback(err, null);
}
if (!err && note) {
callback(null, note);
} else {
logger.error('find note failed: ' + err);
callback(err, null);
};
});
}
function newNote(id, owner, callback) {
var permission = "freely";
if (owner && owner != "null") {
permission = "editable";
}
var note = new model({
id: id,
permission: permission,
updated: Date.now(),
created: Date.now()
});
note.save(function (err) {
if (err) {
logger.error('new note failed: ' + err);
callback(err, null);
} else {
logger.info("new note success: " + note.id);
callback(null, note);
};
});
}
function findOrNewNote(id, owner, callback) {
findNote(id, function (err, note) {
if (err || !note) {
newNote(id, owner, function (err, note) {
if (err) {
logger.error('find or new note failed: ' + err);
callback(err, null);
} else {
callback(null, note);
}
});
} else {
if (!note.permission) {
var permission = "freely";
if (owner && owner != "null") {
permission = "editable";
}
note.permission = permission;
note.updated = Date.now();
note.save(function (err) {
if (err) {
logger.error('add note permission failed: ' + err);
callback(err, null);
} else {
logger.info("add note permission success: " + note.id);
callback(null, note);
};
});
} else {
callback(null, note);
}
}
});
}
function increaseViewCount(note, callback) {
note.viewcount++;
note.updated = Date.now();
note.save(function (err) {
if (err) {
logger.error('increase note viewcount failed: ' + err);
callback(err, null);
} else {
logger.info("increase note viewcount success: " + note.id);
callback(null, note);
};
});
}
function updatePermission(note, permission, callback) {
note.permission = permission;
note.updated = Date.now();
note.save(function (err) {
if (err) {
logger.error('update note permission failed: ' + err);
callback(err, null);
} else {
logger.info("update note permission success: " + note.id);
callback(null, note);
};
});
}
function updateLastChangeUser(note, lastchangeuser, callback) {
note.lastchangeuser = lastchangeuser;
note.updated = Date.now();
note.save(function (err) {
if (err) {
logger.error('update note lastchangeuser failed: ' + err);
callback(err, null);
} else {
logger.info("update note lastchangeuser success: " + note.id);
callback(null, note);
};
});
}
module.exports = note;
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