HackMD/public/js/utils.js

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JavaScript
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import base64url from 'base64url'
let 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
export function checkNoteIdValid (id) {
let result = id.match(uuidRegex)
if (result && result.length === 1) {
return true
} else {
return false
}
}
export function encodeNoteId (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)
}
export function decodeNoteId (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('-')
}