hedgedoc/lib/models/note.js

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'use strict'
// external modules
const fs = require('fs')
const path = require('path')
const LZString = require('lz-string')
const base64url = require('base64url')
const md = require('markdown-it')()
const metaMarked = require('@hedgedoc/meta-marked')
const cheerio = require('cheerio')
const shortId = require('shortid')
const Sequelize = require('sequelize')
const async = require('async')
const moment = require('moment')
const DiffMatchPatch = require('diff-match-patch')
const dmp = new DiffMatchPatch()
const S = require('string')
// core
const config = require('../config')
const logger = require('../logger')
const utils = require('../utils')
// ot
const ot = require('../ot')
// permission types
const permissionTypes = ['freely', 'editable', 'limited', 'locked', 'protected', 'private']
module.exports = function (sequelize, DataTypes) {
const 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,
hooks: {
beforeCreate: function (note, options) {
return new Promise(function (resolve, reject) {
// if no content specified then use default note
if (!note.content) {
let body = null
let filePath = null
if (note.alias) {
Fix Relative Path Traversal Attack on note creation Impact --- An attacker can read arbitrary `.md` files from the server's filesystem due to an [improper input validation](https://cwe.mitre.org/data/definitions/20.html), which results in the ability to perform a [relative path traversal](https://cwe.mitre.org/data/definitions/23.html). CVSSv3 string: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N PoC / Quicktest --- To verify if you are affected, you can try to open the following URL: `http://localhost:3000/..%2F..%2FREADME#` (replace `http://localhost:3000` with your instance's base-URL e.g. `https://demo.hedgedoc.org/..%2F..%2FREADME#`). - If you see a README page being rendered, you run an affected version. Analysis --- The attack works due the fact that [the internal router, passes the url-encoded alias](https://github.com/hedgedoc/hedgedoc/blob/master/lib/web/note/router.js#L26) to the `noteController.showNote`-function. This function passes the input directly to [`findNote()`](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/web/note/util.js#L10) utility function, that will pass it on the the [`parseNoteId()`](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L188-L258)-function, that tries to make sense out of the noteId/alias and check if a note already exists and if so, if a corresponding file on disk was updated. If no note exists the [note creation-function is called](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L240-L245), which pass this unvalidated alias, with a `.md` appended, into a [`path.join()`-function](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L99) which is read from the filesystem in the follow up routine and provides the pre-filled content of the new note. This allows an attacker to not only read arbitrary `.md` files from the filesystem, but also observes changes to them. The usefulness of this attack can be considered limited, since mainly markdown files are use the file-ending `.md` and all markdown files contained in the hedgedoc project, like the README, are public anyway. If other protections such as a chroot or container or proper file permissions are in place, this attack's usefulness is rather limited. Workarounds --- On a reverse-proxy level one can force a URL-decode, which will prevent this attack because the router will not accept such a path. For more information --- If you have any questions or comments about this advisory: * Open an topic on [our community forum](https://community.hedgedoc.org) * Join our [matrix room](https://chat.hedgedoc.org) Advisory link --- https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-p528-555r-pf87 Signed-off-by: Christoph (Sheogorath) Kern <sheogorath@shivering-isles.com>
2021-03-22 19:02:30 -04:00
filePath = path.join(config.docsPath, path.basename(note.alias) + '.md')
}
if (!filePath || !Note.checkFileExist(filePath)) {
filePath = config.defaultNotePath
}
if (Note.checkFileExist(filePath)) {
const 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 resolve(note)
})
},
afterCreate: function (note, options, callback) {
return new Promise(function (resolve, reject) {
sequelize.models.Revision.saveNoteRevision(note, function (err, revision) {
if (err) {
return reject(err)
}
return resolve(note)
})
})
}
}
})
Note.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
})
}
Note.checkFileExist = function (filePath) {
try {
return fs.statSync(filePath).isFile()
} catch (err) {
return false
}
}
Note.encodeNoteId = function (id) {
// remove dashes in UUID and encode in url-safe base64
const str = id.replace(/-/g, '')
const hexStr = Buffer.from(str, 'hex')
return base64url.encode(hexStr)
}
Note.decodeNoteId = function (encodedId) {
// decode from url-safe base64
const id = base64url.toBuffer(encodedId).toString('hex')
// add dashes between the UUID string parts
const 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('-')
}
Note.checkNoteIdValid = function (id) {
const 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
const result = id.match(uuidRegex)
if (result && result.length === 1) { return true } else { return false }
}
Note.parseNoteId = function (noteId, callback) {
async.series({
parseNoteIdByAlias: function (_callback) {
// try to parse note id by alias (e.g. doc)
Note.findOne({
where: utils.isMySQL(sequelize)
? sequelize.where(sequelize.fn('BINARY', sequelize.col('alias')), noteId)
: {
alias: noteId
}
}).then(function (note) {
if (note) {
Fix Relative Path Traversal Attack on note creation Impact --- An attacker can read arbitrary `.md` files from the server's filesystem due to an [improper input validation](https://cwe.mitre.org/data/definitions/20.html), which results in the ability to perform a [relative path traversal](https://cwe.mitre.org/data/definitions/23.html). CVSSv3 string: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N PoC / Quicktest --- To verify if you are affected, you can try to open the following URL: `http://localhost:3000/..%2F..%2FREADME#` (replace `http://localhost:3000` with your instance's base-URL e.g. `https://demo.hedgedoc.org/..%2F..%2FREADME#`). - If you see a README page being rendered, you run an affected version. Analysis --- The attack works due the fact that [the internal router, passes the url-encoded alias](https://github.com/hedgedoc/hedgedoc/blob/master/lib/web/note/router.js#L26) to the `noteController.showNote`-function. This function passes the input directly to [`findNote()`](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/web/note/util.js#L10) utility function, that will pass it on the the [`parseNoteId()`](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L188-L258)-function, that tries to make sense out of the noteId/alias and check if a note already exists and if so, if a corresponding file on disk was updated. If no note exists the [note creation-function is called](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L240-L245), which pass this unvalidated alias, with a `.md` appended, into a [`path.join()`-function](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L99) which is read from the filesystem in the follow up routine and provides the pre-filled content of the new note. This allows an attacker to not only read arbitrary `.md` files from the filesystem, but also observes changes to them. The usefulness of this attack can be considered limited, since mainly markdown files are use the file-ending `.md` and all markdown files contained in the hedgedoc project, like the README, are public anyway. If other protections such as a chroot or container or proper file permissions are in place, this attack's usefulness is rather limited. Workarounds --- On a reverse-proxy level one can force a URL-decode, which will prevent this attack because the router will not accept such a path. For more information --- If you have any questions or comments about this advisory: * Open an topic on [our community forum](https://community.hedgedoc.org) * Join our [matrix room](https://chat.hedgedoc.org) Advisory link --- https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-p528-555r-pf87 Signed-off-by: Christoph (Sheogorath) Kern <sheogorath@shivering-isles.com>
2021-03-22 19:02:30 -04:00
const filePath = path.join(config.docsPath, path.basename(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
const fsModifiedTime = moment(fs.statSync(filePath).mtime)
const dbModifiedTime = moment(note.lastchangeAt || note.createdAt)
const body = fs.readFileSync(filePath, 'utf8')
const contentLength = body.length
const title = Note.parseNoteTitle(body)
if (fsModifiedTime.isAfter(dbModifiedTime) && note.content !== body) {
note.update({
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
const patch = dmp.patch_fromText(revision.patch)
const operations = Note.transformPatchToOperations(patch, contentLength)
let authorship = note.authorship
for (let i = 0; i < operations.length; i++) {
authorship = Note.updateAuthorshipByOperation(operations[i], null, authorship)
}
note.update({
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 {
Fix Relative Path Traversal Attack on note creation Impact --- An attacker can read arbitrary `.md` files from the server's filesystem due to an [improper input validation](https://cwe.mitre.org/data/definitions/20.html), which results in the ability to perform a [relative path traversal](https://cwe.mitre.org/data/definitions/23.html). CVSSv3 string: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N PoC / Quicktest --- To verify if you are affected, you can try to open the following URL: `http://localhost:3000/..%2F..%2FREADME#` (replace `http://localhost:3000` with your instance's base-URL e.g. `https://demo.hedgedoc.org/..%2F..%2FREADME#`). - If you see a README page being rendered, you run an affected version. Analysis --- The attack works due the fact that [the internal router, passes the url-encoded alias](https://github.com/hedgedoc/hedgedoc/blob/master/lib/web/note/router.js#L26) to the `noteController.showNote`-function. This function passes the input directly to [`findNote()`](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/web/note/util.js#L10) utility function, that will pass it on the the [`parseNoteId()`](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L188-L258)-function, that tries to make sense out of the noteId/alias and check if a note already exists and if so, if a corresponding file on disk was updated. If no note exists the [note creation-function is called](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L240-L245), which pass this unvalidated alias, with a `.md` appended, into a [`path.join()`-function](https://github.com/hedgedoc/hedgedoc/blob/78a732abe691b496fa3692aa2add37f7344db1fa/lib/models/note.js#L99) which is read from the filesystem in the follow up routine and provides the pre-filled content of the new note. This allows an attacker to not only read arbitrary `.md` files from the filesystem, but also observes changes to them. The usefulness of this attack can be considered limited, since mainly markdown files are use the file-ending `.md` and all markdown files contained in the hedgedoc project, like the README, are public anyway. If other protections such as a chroot or container or proper file permissions are in place, this attack's usefulness is rather limited. Workarounds --- On a reverse-proxy level one can force a URL-decode, which will prevent this attack because the router will not accept such a path. For more information --- If you have any questions or comments about this advisory: * Open an topic on [our community forum](https://community.hedgedoc.org) * Join our [matrix room](https://chat.hedgedoc.org) Advisory link --- https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-p528-555r-pf87 Signed-off-by: Christoph (Sheogorath) Kern <sheogorath@shivering-isles.com>
2021-03-22 19:02:30 -04:00
const filePath = path.join(config.docsPath, path.basename(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 {
const id = LZString.decompressFromBase64(noteId)
if (id && Note.checkNoteIdValid(id)) { return callback(null, id) } else { return _callback(null, null) }
} catch (err) {
if (err.message === 'Cannot read property \'charAt\' of undefined') {
logger.warning('Looks like we can not decode "' + noteId + '" with LZString. Can be ignored.')
} else {
logger.error(err)
}
return _callback(null, null)
}
},
parseNoteIdByBase64Url: function (_callback) {
// try to parse note id by base64url
try {
const 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: utils.isMySQL(sequelize)
? sequelize.where(sequelize.fn('BINARY', sequelize.col('shortid')), noteId)
: {
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)
})
}
Note.parseNoteInfo = function (body) {
const parsed = Note.extractMeta(body)
const $ = cheerio.load(md.render(parsed.markdown))
return {
title: Note.extractNoteTitle(parsed.meta, $),
tags: Note.extractNoteTags(parsed.meta, $)
}
}
Note.parseNoteTitle = function (body) {
const parsed = Note.extractMeta(body)
const $ = cheerio.load(md.render(parsed.markdown))
return Note.extractNoteTitle(parsed.meta, $)
}
Note.extractNoteTitle = function (meta, $) {
let title = ''
if (meta.title && (typeof meta.title === 'string' || typeof meta.title === 'number')) {
title = meta.title
} else {
const 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
}
Note.generateDescription = function (markdown) {
return markdown.substr(0, 100).replace(/(?:\r\n|\r|\n)/g, ' ')
}
Note.decodeTitle = function (title) {
return title || 'Untitled'
}
Note.generateWebTitle = function (title) {
Replace CodiMD with HedgeDoc Signed-off-by: Erik Michelson <github@erik.michelson.eu> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: References in public/views Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Update links in README Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Update links in SECURITY.md Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Update links in LICENSE Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Update links in docs/configuration.md Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Update links in bin/setup Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: References in docs/guides Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: References in docs/dev Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: References in docs/guides/auth Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: References in docs/setup Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Update various links in code to the new GitHub org. Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: codiMDVersion.js is now hedgeDocVersion.js Signed-off-by: David Mehren <git@herrmehren.de> Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: References in docs/setup/yunohost Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rebrand to HedgeDoc: Add banner and logo Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Update links in docs/guides/migrate-etherpad Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Remove note in docs/guides/auth/github Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Replace links in public/docs/features Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Add todo placeholder in docs/history Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Replace github link in public/views/index/body Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Replace github link in README Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Add logo to README Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Rename to HedgeDoc: Add note about the renaming to the front page Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de> Removed Travis from README.md and change CodiMD to HedgeDoc in some places Signed-off-by: Yannick Bungers <git@innay.de> Some more renaming to HedgeDoc - Fixed capitalization of HedgeDoc - Added renaming for etherpad migration doc Signed-off-by: Yannick Bungers <git@innay.de> Changed Repo name to hedgedoc Signed-off-by: Yannick Bungers <git@innay.de>
2020-07-02 11:22:52 -04:00
title = !title || title === 'Untitled' ? 'HedgeDoc - Collaborative markdown notes' : title + ' - HedgeDoc'
return title
}
Note.extractNoteTags = function (meta, $) {
const tags = []
const rawtags = []
if (meta.tags && (typeof meta.tags === 'string' || typeof meta.tags === 'number')) {
const metaTags = ('' + meta.tags).split(',')
for (let i = 0; i < metaTags.length; i++) {
const text = metaTags[i].trim()
if (text) rawtags.push(text)
}
} else {
const h6s = $('h6')
h6s.each(function (key, value) {
if (/^tags/gmi.test($(value).text())) {
const codes = $(value).find('code')
for (let i = 0; i < codes.length; i++) {
const text = S($(codes[i]).text().trim()).stripTags().s
if (text) rawtags.push(text)
}
}
})
}
for (let i = 0; i < rawtags.length; i++) {
let 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
}
Note.extractMeta = function (content) {
let obj = null
try {
obj = metaMarked(content)
if (!obj.markdown) obj.markdown = ''
if (!obj.meta) obj.meta = {}
} catch (err) {
obj = {
markdown: content,
meta: {}
}
}
return obj
}
Note.parseMeta = function (meta) {
const _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.lang && (typeof meta.lang === 'string')) { _meta.lang = meta.lang }
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 }
if (meta.opengraph && (typeof meta.opengraph === 'object')) { _meta.opengraph = meta.opengraph }
}
return _meta
}
Note.parseOpengraph = function (meta, title) {
let _ogdata = {}
if (meta.opengraph) { _ogdata = meta.opengraph }
if (!(_ogdata.title && (typeof _ogdata.title === 'string' || typeof _ogdata.title === 'number'))) { _ogdata.title = title }
if (!(_ogdata.description && (typeof _ogdata.description === 'string' || typeof _ogdata.description === 'number'))) { _ogdata.description = meta.description || '' }
if (!(_ogdata.type && (typeof _ogdata.type === 'string'))) { _ogdata.type = 'website' }
return _ogdata
}
Note.updateAuthorshipByOperation = function (operation, userId, authorships) {
let index = 0
const timestamp = Date.now()
for (let i = 0; i < operation.length; i++) {
const op = operation[i]
if (ot.TextOperation.isRetain(op)) {
index += op
} else if (ot.TextOperation.isInsert(op)) {
const opStart = index
const opEnd = index + op.length
let 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++) {
const authorship = authorships[j]
if (!inserted) {
const nextAuthorship = authorships[j + 1] || -1
if ((nextAuthorship !== -1 && nextAuthorship[1] >= opEnd) || j >= authorships.length - 1) {
if (authorship[1] < opStart && authorship[2] > opStart) {
// divide
const 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)) {
const opStart = index
const opEnd = index - op
if (operation.length === 1) {
authorships = []
} else if (authorships.length > 0) {
for (let j = 0; j < authorships.length; j++) {
const 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++) {
const authorship = authorships[j]
for (let k = j + 1; k < authorships.length; k++) {
const nextAuthorship = authorships[k]
if (nextAuthorship && authorship[0] === nextAuthorship[0] && authorship[2] === nextAuthorship[1]) {
const minTimestamp = Math.min(authorship[3], nextAuthorship[3])
const 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++) {
const authorship = authorships[j]
if (!authorship[0]) {
authorships.splice(j, 1)
j -= 1
}
}
return authorships
}
Note.transformPatchToOperations = function (patch, contentLength) {
const operations = []
if (patch.length > 0) {
// calculate original content length
for (let j = patch.length - 1; j >= 0; j--) {
const p = patch[j]
for (let i = 0; i < p.diffs.length; i++) {
const 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
let bias = 0
let lengthBias = 0
for (let j = 0; j < patch.length; j++) {
const operation = []
const p = patch[j]
let currIndex = p.start1
const currLength = contentLength - bias
for (let i = 0; i < p.diffs.length; i++) {
const 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
}
return Note
}