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24 lines
766 B
JavaScript
24 lines
766 B
JavaScript
const createHmac = require('create-hmac')
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const KEY = '943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881'
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const SALT = '520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5'
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const urlSafeBase64 = (string) => {
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return Buffer.from(string).toString('base64').replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')
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}
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const hexDecode = (hex) => Buffer.from(hex, 'hex')
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const sign = (salt, target, secret) => {
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const hmac = createHmac('sha256', hexDecode(secret))
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hmac.update(hexDecode(salt))
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hmac.update(target)
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return urlSafeBase64(hmac.digest())
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}
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const path = "/rs:fit:300:300/plain/http://img.example.com/pretty/image.jpg"
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const signature = sign(SALT, path, KEY)
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const result = `/${signature}${path}`
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console.log(result)
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