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'use strict'
// history
// external modules
const LZString = require('lz-string')
// core
const logger = require('./logger')
const models = require('./models')
const errors = require('./errors')
// public
const History = {
historyGet: historyGet,
historyPost: historyPost,
historyDelete: historyDelete,
updateHistory: updateHistory
}
function getHistory (userid, callback) {
models.User.findOne({
where: {
id: userid
}
}).then(function (user) {
if (!user) {
return callback(null, null)
}
let history = {}
if (user.history) {
history = JSON.parse(user.history)
// migrate LZString encoded note id to base64url encoded note id
for (let i = 0, l = history.length; i < l; i++) {
// 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 (!(history[i].id.length > base64UuidLength)) {
continue
}
try {
const id = LZString.decompressFromBase64(history[i].id)
if (id && models.Note.checkNoteIdValid(id)) {
history[i].id = models.Note.encodeNoteId(id)
}
} catch (err) {
// most error here comes from LZString, ignore
if (err.message === 'Cannot read property \'charAt\' of undefined') {
logger.warning('Looks like we can not decode "' + history[i].id + '" with LZString. Can be ignored.')
} else {
logger.error(err)
}
}
}
history = parseHistoryToObject(history)
}
logger.debug(`read history success: ${user.id}`)
return callback(null, history)
}).catch(function (err) {
logger.error('read history failed: ' + err)
return callback(err, null)
})
}
function setHistory (userid, history, callback) {
models.User.update({
history: JSON.stringify(parseHistoryToArray(history))
}, {
where: {
id: userid
}
}).then(function (count) {
return callback(null, count)
}).catch(function (err) {
logger.error('set history failed: ' + err)
return callback(err, null)
})
}
function updateHistory (userid, noteId, document, time) {
if (userid && noteId && typeof document !== 'undefined') {
getHistory(userid, function (err, history) {
if (err || !history) return
if (!history[noteId]) {
history[noteId] = {}
}
const noteHistory = history[noteId]
const noteInfo = models.Note.parseNoteInfo(document)
noteHistory.id = noteId
noteHistory.text = noteInfo.title
noteHistory.time = time || Date.now()
noteHistory.tags = noteInfo.tags
setHistory(userid, history, function (err, count) {
if (err) {
logger.log(err)
}
})
})
}
}
function parseHistoryToArray (history) {
const _history = []
Object.keys(history).forEach(function (key) {
const item = history[key]
_history.push(item)
})
return _history
}
function parseHistoryToObject (history) {
const _history = {}
for (let i = 0, l = history.length; i < l; i++) {
const item = history[i]
_history[item.id] = item
}
return _history
}
function historyGet (req, res) {
if (req.isAuthenticated()) {
getHistory(req.user.id, function (err, history) {
if (err) return errors.errorInternalError(res)
if (!history) return errors.errorNotFound(res)
res.send({
history: parseHistoryToArray(history)
})
})
} else {
return errors.errorForbidden(res)
}
}
function historyPost (req, res) {
if (req.isAuthenticated()) {
const noteId = req.params.noteId
if (!noteId) {
if (typeof req.body.history === 'undefined') return errors.errorBadRequest(res)
logger.debug(`SERVER received history from [${req.user.id}]: ${req.body.history}`)
try {
const history = JSON.parse(req.body.history)
if (Array.isArray(history)) {
setHistory(req.user.id, history, function (err, count) {
if (err) return errors.errorInternalError(res)
res.end()
})
} else {
return errors.errorBadRequest(res)
}
} catch (err) {
return errors.errorBadRequest(res)
}
} else {
if (typeof req.body.pinned === 'undefined') return errors.errorBadRequest(res)
getHistory(req.user.id, function (err, history) {
if (err) return errors.errorInternalError(res)
if (!history) return errors.errorNotFound(res)
if (!history[noteId]) return errors.errorNotFound(res)
if (req.body.pinned === 'true' || req.body.pinned === 'false') {
history[noteId].pinned = (req.body.pinned === 'true')
setHistory(req.user.id, history, function (err, count) {
if (err) return errors.errorInternalError(res)
res.end()
})
} else {
return errors.errorBadRequest(res)
}
})
}
} else {
return errors.errorForbidden(res)
}
}
function historyDelete (req, res) {
if (req.isAuthenticated()) {
const noteId = req.params.noteId
if (!noteId) {
setHistory(req.user.id, [], function (err, count) {
if (err) return errors.errorInternalError(res)
res.end()
})
} else {
getHistory(req.user.id, function (err, history) {
if (err) return errors.errorInternalError(res)
if (!history) return errors.errorNotFound(res)
delete history[noteId]
setHistory(req.user.id, history, function (err, count) {
if (err) return errors.errorInternalError(res)
res.end()
})
})
}
} else {
return errors.errorForbidden(res)
}
}
module.exports = History
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