33 lines
1015 B
TypeScript
33 lines
1015 B
TypeScript
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type Challenge = {
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codeVerifier: string
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codeChallenge: string
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}
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export async function getCodeChallenge(): Promise<Challenge> {
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const codeVerifier = generateRandomString()
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const encoder = new TextEncoder()
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const encoded = encoder.encode(codeVerifier)
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const shaEncoded = await crypto.subtle.digest('SHA-256', encoded)
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const strEncoded = btoa(String.fromCharCode(...new Uint8Array(shaEncoded)))
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const codeChallenge = base64URLEncode(strEncoded)
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return { codeVerifier, codeChallenge }
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}
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function generateRandomString() {
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const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~'
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const length = Math.floor(Math.random() * (128 - 43 + 1)) + 43
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const randomString = Array.from({ length }, () => {
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const randomIndex = Math.floor(Math.random() * characters.length)
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return characters.charAt(randomIndex)
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}).join('')
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return randomString
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}
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function base64URLEncode(str: string) {
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return str.replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '')
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}
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