KeyCDN Secure Token

generateToken.ts

const domain = 'domain'
const secret = 'supersecret'
const expire = Math.round(Date.now() / 1000) + 120
const links: { original?: string } = {}
const path = `/${this.filetype}/${this.uid}.${this.fileext}`

const generateToken = ({ path, query = '' }: { path: string; query?: string }): string => {
  
  // generate md5 token
  const md5String = crypto
    .createHash('md5')
    .update(path + query + secret + expire)
    .digest()

  // encode and format md5 token
  const token = md5String
    .toString('base64')
    .replace(/\+/g, '-')
    .replace(/\//g, '_')
    .replace(/\=/g, '')

  return token
}

const [width, height] = '600x600'.split('x')
let query = width && height ? 'crop=smart' : ''
query += width && `&width=${width}`
query += height && `&height=${height}`

const token = generateToken({ path, query })
const link = `https://${domain}${path}?${query}&token=${token}&expire=${expire}`

// Data generated
// secure_string: /image/123456.jpgcrop=smart&width=600&height=600supersecret1644242946
// secure_params: |______path_____||____________query____________||__secret_||_expire_|
// token: 6Xbv48A73BjLT3KKyzobww
// link: https://domain/image/123456.jpg?crop=smart&width=600&height=600&token=6Xbv48A73BjLT3KKyzobww&expire=1644242946