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"use strict";
// external modules
var fs = require('fs');
var path = require('path');
var LZString = require('lz-string');
var md = require('markdown-it')();
var metaMarked = require('meta-marked');
var cheerio = require('cheerio');
var shortId = require('shortid');
var Sequelize = require("sequelize");
var async = require('async');
var moment = require('moment');
// core
var config = require("../config.js");
var logger = require("../logger.js");
// permission types
var permissionTypes = ["freely", "editable", "locked", "private"];
module.exports = function (sequelize, DataTypes) {
var Note = sequelize.define("Note", {
id: {
type: DataTypes.UUID,
primaryKey: true,
defaultValue: Sequelize.UUIDV4
},
shortid: {
type: DataTypes.STRING,
unique: true,
allowNull: false,
defaultValue: shortId.generate
},
alias: {
type: DataTypes.STRING,
unique: true
},
permission: {
type: DataTypes.ENUM,
values: permissionTypes
},
viewcount: {
type: DataTypes.INTEGER,
allowNull: false,
defaultValue: 0
},
title: {
type: DataTypes.TEXT
},
content: {
type: DataTypes.TEXT
},
lastchangeAt: {
type: DataTypes.DATE
},
savedAt: {
type: DataTypes.DATE
}
}, {
classMethods: {
associate: function (models) {
Note.belongsTo(models.User, {
foreignKey: "ownerId",
as: "owner",
constraints: false
});
Note.belongsTo(models.User, {
foreignKey: "lastchangeuserId",
as: "lastchangeuser",
constraints: false
});
Note.hasMany(models.Revision, {
foreignKey: "noteId",
constraints: false
});
},
checkFileExist: function (filePath) {
try {
return fs.statSync(filePath).isFile();
} catch (err) {
return false;
}
},
checkNoteIdValid: function (id) {
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;
},
parseNoteId: function (noteId, callback) {
async.series({
parseNoteIdByAlias: function (_callback) {
// try to parse note id by alias (e.g. doc)
Note.findOne({
where: {
alias: noteId
}
}).then(function (note) {
if (note) {
var filePath = path.join(config.docspath, noteId + '.md');
if (Note.checkFileExist(filePath)) {
// if doc in filesystem have newer modified time than last change time
// then will update the doc in db
var fsModifiedTime = moment(fs.statSync(filePath).mtime);
var dbModifiedTime = moment(note.lastchangeAt || note.createdAt);
if (fsModifiedTime.isAfter(dbModifiedTime)) {
var body = fs.readFileSync(filePath, 'utf8');
note.update({
title: LZString.compressToBase64(Note.parseNoteTitle(body)),
content: LZString.compressToBase64(body),
lastchangeAt: fsModifiedTime
}).then(function (note) {
sequelize.models.Revision.saveNoteRevision(note, function (err, revision) {
if (err) return _callback(err, null);
return callback(null, note.id);
});
}).catch(function (err) {
return _callback(err, null);
});
} else {
return callback(null, note.id);
}
} else {
return callback(null, note.id);
}
} else {
var filePath = path.join(config.docspath, noteId + '.md');
if (Note.checkFileExist(filePath)) {
Note.create({
alias: noteId,
owner: null,
permission: 'locked'
}).then(function (note) {
return callback(null, note.id);
}).catch(function (err) {
return _callback(err, null);
});
} else {
return _callback(null, null);
}
}
}).catch(function (err) {
return _callback(err, null);
});
},
parseNoteIdByLZString: function (_callback) {
// try to parse note id by LZString Base64
try {
var id = LZString.decompressFromBase64(noteId);
if (id && Note.checkNoteIdValid(id))
return callback(null, id);
else
return _callback(null, null);
} catch (err) {
return _callback(err, null);
}
},
parseNoteIdByShortId: function (_callback) {
// try to parse note id by shortId
try {
if (shortId.isValid(noteId)) {
Note.findOne({
where: {
shortid: noteId
}
}).then(function (note) {
if (!note) return _callback(null, null);
return callback(null, note.id);
}).catch(function (err) {
return _callback(err, null);
});
} else {
return _callback(null, null);
}
} catch (err) {
return _callback(err, null);
}
}
}, function (err, result) {
if (err) {
logger.error(err);
return callback(err, null);
}
return callback(null, null);
});
},
parseNoteTitle: function (body) {
var title = "";
var meta = null;
try {
var obj = metaMarked(body);
body = obj.markdown;
meta = obj.meta;
} catch (err) {
//na
}
if (meta && meta.title && (typeof meta.title == "string" || typeof meta.title == "number")) {
title = meta.title;
} else {
var $ = cheerio.load(md.render(body));
var h1s = $("h1");
if (h1s.length > 0 && h1s.first().text().split('\n').length == 1)
title = h1s.first().text();
}
if (!title) title = "Untitled";
return title;
},
decodeTitle: function (title) {
var decodedTitle = LZString.decompressFromBase64(title);
if (decodedTitle) title = decodedTitle;
else title = 'Untitled';
return title;
},
generateWebTitle: function (title) {
title = !title || title == "Untitled" ? "HackMD - Collaborative markdown notes" : title + " - HackMD";
return title;
},
parseMeta: function (meta) {
var _meta = {};
if (meta) {
if (meta.title && (typeof meta.title == "string" || typeof meta.title == "number"))
_meta.title = meta.title;
if (meta.description && (typeof meta.description == "string" || typeof meta.description == "number"))
_meta.description = meta.description;
if (meta.robots && (typeof meta.robots == "string" || typeof meta.robots == "number"))
_meta.robots = meta.robots;
if (meta.GA && (typeof meta.GA == "string" || typeof meta.GA == "number"))
_meta.GA = meta.GA;
}
return _meta;
}
},
hooks: {
beforeCreate: function (note, options, callback) {
// if no content specified then use default note
if (!note.content) {
var body = null;
var filePath = null;
if (!note.alias) {
filePath = config.defaultnotepath;
} else {
filePath = path.join(config.docspath, note.alias + '.md');
}
if (Note.checkFileExist(filePath)) {
var fsCreatedTime = moment(fs.statSync(filePath).ctime);
body = fs.readFileSync(filePath, 'utf8');
note.title = LZString.compressToBase64(Note.parseNoteTitle(body));
note.content = LZString.compressToBase64(body);
if (filePath !== config.defaultnotepath) {
note.createdAt = fsCreatedTime;
}
}
}
// if no permission specified and have owner then give editable permission, else default permission is freely
if (!note.permission) {
if (note.ownerId) {
note.permission = "editable";
} else {
note.permission = "freely";
}
}
return callback(null, note);
},
afterCreate: function (note, options, callback) {
sequelize.models.Revision.saveNoteRevision(note, function (err, revision) {
callback(err, note);
});
}
}
});
return Note;
};
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