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[READ-ONLY] Mirror of https://github.com/openstatusHQ/openstatus. 🫖 Status page with uptime monitoring & API monitoring as code 🫖 openstatus.dev
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1.8 kB · 61 lines
TypeScript
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162// Web Crypto only: this package runs on Deno and stays Edge-safe.
const encoder = new TextEncoder();
function randomBytes(length: number): Uint8Array { const bytes = new Uint8Array(length); crypto.getRandomValues(bytes); return bytes;}
export function toBase64Url(bytes: Uint8Array): string { let binary = ""; for (const byte of bytes) binary += String.fromCharCode(byte); return btoa(binary) .replace(/\+/g, "-") .replace(/\//g, "_") .replace(/=+$/, "");}
export function toHex(bytes: Uint8Array): string { return Array.from(bytes, (b) => b.toString(16).padStart(2, "0")).join("");}
export function randomBase64Url(length = 32): string { return toBase64Url(randomBytes(length));}
export function randomHex(length = 16): string { return toHex(randomBytes(length));}
async function sha256(input: string): Promise<Uint8Array> { const digest = await crypto.subtle.digest("SHA-256", encoder.encode(input)); return new Uint8Array(digest);}
export async function sha256Hex(input: string): Promise<string> { return toHex(await sha256(input));}
/** RFC 7636 S256: BASE64URL(SHA256(ASCII(code_verifier))). */export async function pkceChallenge(verifier: string): Promise<string> { return toBase64Url(await sha256(verifier));}
export function constantTimeEqual(a: string, b: string): boolean { if (a.length !== b.length) return false; let diff = 0; for (let i = 0; i < a.length; i++) diff |= a.charCodeAt(i) ^ b.charCodeAt(i); return diff === 0;}
const VERIFIER_RE = /^[A-Za-z0-9\-._~]{43,128}$/;
export async function verifyPkce( verifier: string, challenge: string,): Promise<boolean> { if (!VERIFIER_RE.test(verifier)) return false; return constantTimeEqual(await pkceChallenge(verifier), challenge);}