codimd/lib/models/note.js

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'use strict'
// external modules
var fs = require('fs')
var path = require('path')
var LZString = require('lz-string')
var base64url = require('base64url')
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')
var DiffMatchPatch = require('diff-match-patch')
var dmp = new DiffMatchPatch()
var S = require('string')
// core
var config = require('../config')
var logger = require('../logger')
// ot
var ot = require('../ot')
// permission types
var permissionTypes = ['freely', 'editable', 'limited', 'locked', 'protected', '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,
get: function () {
return sequelize.processData(this.getDataValue('title'), '')
},
set: function (value) {
this.setDataValue('title', sequelize.stripNullByte(value))
}
},
content: {
type: DataTypes.TEXT('long'),
get: function () {
return sequelize.processData(this.getDataValue('content'), '')
},
set: function (value) {
this.setDataValue('content', sequelize.stripNullByte(value))
}
},
authorship: {
type: DataTypes.TEXT('long'),
get: function () {
return sequelize.processData(this.getDataValue('authorship'), [], JSON.parse)
},
set: function (value) {
this.setDataValue('authorship', JSON.stringify(value))
}
},
lastchangeAt: {
type: DataTypes.DATE
},
savedAt: {
type: DataTypes.DATE
}
}, {
paranoid: false,
classMethods: {
associate: function (models) {
Note.belongsTo(models.User, {
foreignKey: 'ownerId',
as: 'owner',
constraints: false,
onDelete: 'CASCADE',
hooks: true
})
Note.belongsTo(models.User, {
foreignKey: 'lastchangeuserId',
as: 'lastchangeuser',
constraints: false
})
Note.hasMany(models.Revision, {
foreignKey: 'noteId',
constraints: false
})
Note.hasMany(models.Author, {
foreignKey: 'noteId',
as: 'authors',
constraints: false
})
},
checkFileExist: function (filePath) {
try {
return fs.statSync(filePath).isFile()
} catch (err) {
return false
}
},
encodeNoteId: function (id) {
// remove dashes in UUID and encode in url-safe base64
let str = id.replace(/-/g, '')
let hexStr = Buffer.from(str, 'hex')
return base64url.encode(hexStr)
},
decodeNoteId: function (encodedId) {
// decode from url-safe base64
let id = base64url.toBuffer(encodedId).toString('hex')
// add dashes between the UUID string parts
let idParts = []
idParts.push(id.substr(0, 8))
idParts.push(id.substr(8, 4))
idParts.push(id.substr(12, 4))
idParts.push(id.substr(16, 4))
idParts.push(id.substr(20, 12))
return idParts.join('-')
},
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) {
let 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)
var body = fs.readFileSync(filePath, 'utf8')
var contentLength = body.length
var title = Note.parseNoteTitle(body)
if (fsModifiedTime.isAfter(dbModifiedTime) && note.content !== body) {
note.update({
title: title,
content: body,
lastchangeAt: fsModifiedTime
}).then(function (note) {
sequelize.models.Revision.saveNoteRevision(note, function (err, revision) {
if (err) return _callback(err, null)
// update authorship on after making revision of docs
var patch = dmp.patch_fromText(revision.patch)
var operations = Note.transformPatchToOperations(patch, contentLength)
var authorship = note.authorship
for (let i = 0; i < operations.length; i++) {
authorship = Note.updateAuthorshipByOperation(operations[i], null, authorship)
}
note.update({
authorship: authorship
}).then(function (note) {
return callback(null, note.id)
}).catch(function (err) {
return _callback(err, null)
})
})
}).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)
})
},
// parse note id by LZString is deprecated, here for compability
parseNoteIdByLZString: function (_callback) {
// Calculate minimal string length for an UUID that is encoded
// base64 encoded and optimize comparsion by using -1
// this should make a lot of LZ-String parsing errors obsolete
// as we can assume that a nodeId that is 48 chars or longer is a
// noteID.
const base64UuidLength = ((4 * 36) / 3) - 1
if (!(noteId.length > base64UuidLength)) {
return _callback(null, null)
}
// 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) {
logger.error(err)
return _callback(null, null)
}
},
parseNoteIdByBase64Url: function (_callback) {
// try to parse note id by base64url
try {
var id = Note.decodeNoteId(noteId)
if (id && Note.checkNoteIdValid(id)) { return callback(null, id) } else { return _callback(null, null) }
} catch (err) {
logger.error(err)
return _callback(null, 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)
})
},
parseNoteInfo: function (body) {
var parsed = Note.extractMeta(body)
var $ = cheerio.load(md.render(parsed.markdown))
return {
title: Note.extractNoteTitle(parsed.meta, $),
tags: Note.extractNoteTags(parsed.meta, $)
}
},
parseNoteTitle: function (body) {
var parsed = Note.extractMeta(body)
var $ = cheerio.load(md.render(parsed.markdown))
return Note.extractNoteTitle(parsed.meta, $)
},
extractNoteTitle: function (meta, $) {
var title = ''
if (meta.title && (typeof meta.title === 'string' || typeof meta.title === 'number')) {
title = meta.title
} else {
var h1s = $('h1')
if (h1s.length > 0 && h1s.first().text().split('\n').length === 1) { title = S(h1s.first().text()).stripTags().s }
}
if (!title) title = 'Untitled'
return title
},
generateDescription: function (markdown) {
return markdown.substr(0, 100).replace(/(?:\r\n|\r|\n)/g, ' ')
},
decodeTitle: function (title) {
return title || 'Untitled'
},
generateWebTitle: function (title) {
title = !title || title === 'Untitled' ? 'HackMD - Collaborative markdown notes' : title + ' - HackMD'
return title
},
extractNoteTags: function (meta, $) {
var tags = []
var rawtags = []
if (meta.tags && (typeof meta.tags === 'string' || typeof meta.tags === 'number')) {
var metaTags = ('' + meta.tags).split(',')
for (let i = 0; i < metaTags.length; i++) {
var text = metaTags[i].trim()
if (text) rawtags.push(text)
}
} else {
var h6s = $('h6')
h6s.each(function (key, value) {
if (/^tags/gmi.test($(value).text())) {
var codes = $(value).find('code')
for (let i = 0; i < codes.length; i++) {
var text = S($(codes[i]).text().trim()).stripTags().s
if (text) rawtags.push(text)
}
}
})
}
for (let i = 0; i < rawtags.length; i++) {
var found = false
for (let j = 0; j < tags.length; j++) {
if (tags[j] === rawtags[i]) {
found = true
break
}
}
if (!found) { tags.push(rawtags[i]) }
}
return tags
},
extractMeta: function (content) {
var obj = null
try {
obj = metaMarked(content)
if (!obj.markdown) obj.markdown = ''
if (!obj.meta) obj.meta = {}
} catch (err) {
obj = {
markdown: content,
meta: {}
}
}
return obj
},
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 }
if (meta.disqus && (typeof meta.disqus === 'string' || typeof meta.disqus === 'number')) { _meta.disqus = meta.disqus }
if (meta.slideOptions && (typeof meta.slideOptions === 'object')) { _meta.slideOptions = meta.slideOptions }
}
return _meta
},
updateAuthorshipByOperation: function (operation, userId, authorships) {
var index = 0
var timestamp = Date.now()
for (let i = 0; i < operation.length; i++) {
var op = operation[i]
if (ot.TextOperation.isRetain(op)) {
index += op
} else if (ot.TextOperation.isInsert(op)) {
let opStart = index
let opEnd = index + op.length
var inserted = false
// authorship format: [userId, startPos, endPos, createdAt, updatedAt]
if (authorships.length <= 0) authorships.push([userId, opStart, opEnd, timestamp, timestamp])
else {
for (let j = 0; j < authorships.length; j++) {
let authorship = authorships[j]
if (!inserted) {
let nextAuthorship = authorships[j + 1] || -1
if ((nextAuthorship !== -1 && nextAuthorship[1] >= opEnd) || j >= authorships.length - 1) {
if (authorship[1] < opStart && authorship[2] > opStart) {
// divide
let postLength = authorship[2] - opStart
authorship[2] = opStart
authorship[4] = timestamp
authorships.splice(j + 1, 0, [userId, opStart, opEnd, timestamp, timestamp])
authorships.splice(j + 2, 0, [authorship[0], opEnd, opEnd + postLength, authorship[3], timestamp])
j += 2
inserted = true
} else if (authorship[1] >= opStart) {
authorships.splice(j, 0, [userId, opStart, opEnd, timestamp, timestamp])
j += 1
inserted = true
} else if (authorship[2] <= opStart) {
authorships.splice(j + 1, 0, [userId, opStart, opEnd, timestamp, timestamp])
j += 1
inserted = true
}
}
}
if (authorship[1] >= opStart) {
authorship[1] += op.length
authorship[2] += op.length
}
}
}
index += op.length
} else if (ot.TextOperation.isDelete(op)) {
let opStart = index
let opEnd = index - op
if (operation.length === 1) {
authorships = []
} else if (authorships.length > 0) {
for (let j = 0; j < authorships.length; j++) {
let authorship = authorships[j]
if (authorship[1] >= opStart && authorship[1] <= opEnd && authorship[2] >= opStart && authorship[2] <= opEnd) {
authorships.splice(j, 1)
j -= 1
} else if (authorship[1] < opStart && authorship[1] < opEnd && authorship[2] > opStart && authorship[2] > opEnd) {
authorship[2] += op
authorship[4] = timestamp
} else if (authorship[2] >= opStart && authorship[2] <= opEnd) {
authorship[2] = opStart
authorship[4] = timestamp
} else if (authorship[1] >= opStart && authorship[1] <= opEnd) {
authorship[1] = opEnd
authorship[4] = timestamp
}
if (authorship[1] >= opEnd) {
authorship[1] += op
authorship[2] += op
}
}
}
index += op
}
}
// merge
for (let j = 0; j < authorships.length; j++) {
let authorship = authorships[j]
for (let k = j + 1; k < authorships.length; k++) {
let nextAuthorship = authorships[k]
if (nextAuthorship && authorship[0] === nextAuthorship[0] && authorship[2] === nextAuthorship[1]) {
let minTimestamp = Math.min(authorship[3], nextAuthorship[3])
let maxTimestamp = Math.max(authorship[3], nextAuthorship[3])
authorships.splice(j, 1, [authorship[0], authorship[1], nextAuthorship[2], minTimestamp, maxTimestamp])
authorships.splice(k, 1)
j -= 1
break
}
}
}
// clear
for (let j = 0; j < authorships.length; j++) {
let authorship = authorships[j]
if (!authorship[0]) {
authorships.splice(j, 1)
j -= 1
}
}
return authorships
},
transformPatchToOperations: function (patch, contentLength) {
var operations = []
if (patch.length > 0) {
// calculate original content length
for (let j = patch.length - 1; j >= 0; j--) {
var p = patch[j]
for (let i = 0; i < p.diffs.length; i++) {
var diff = p.diffs[i]
switch (diff[0]) {
case 1: // insert
contentLength -= diff[1].length
break
case -1: // delete
contentLength += diff[1].length
break
}
}
}
// generate operations
var bias = 0
var lengthBias = 0
for (let j = 0; j < patch.length; j++) {
var operation = []
let p = patch[j]
var currIndex = p.start1
var currLength = contentLength - bias
for (let i = 0; i < p.diffs.length; i++) {
let diff = p.diffs[i]
switch (diff[0]) {
case 0: // retain
if (i === 0) {
// first
operation.push(currIndex + diff[1].length)
} else if (i !== p.diffs.length - 1) {
// mid
operation.push(diff[1].length)
} else {
// last
operation.push(currLength + lengthBias - currIndex)
}
currIndex += diff[1].length
break
case 1: // insert
operation.push(diff[1])
lengthBias += diff[1].length
currIndex += diff[1].length
break
case -1: // delete
operation.push(-diff[1].length)
bias += diff[1].length
currIndex += diff[1].length
break
}
}
operations.push(operation)
}
}
return operations
}
},
hooks: {
beforeCreate: function (note, options, callback) {
// if no content specified then use default note
if (!note.content) {
var body = null
let 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 = Note.parseNoteTitle(body)
note.content = body
if (filePath !== config.defaultNotePath) {
note.createdAt = fsCreatedTime
}
}
}
// if no permission specified and have owner then give default permission in config, else default permission is freely
if (!note.permission) {
if (note.ownerId) {
note.permission = config.defaultPermission
} 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
}