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import { encode } from "https://deno.land/std/strings/mod.ts"import { fromUint8Array as convertUint8ArrayToBase64 } from "https://denopkg.com/chiefbiiko/base64/mod.ts"import { convertBase64ToBase64url } from "https://denopkg.com/timonson/base64url/base64url.ts"import { hmac } from "https://denopkg.com/chiefbiiko/hmac/mod.ts"
interface Claims {  iss?: string  sub?: string  aud?: string[] | string  exp?: number  nbf?: number  iat?: number  jti?: string  [key: string]: any}
interface Jose {  alg: string  crit?: string[]  [key: string]: any}
function convertToBase64url(  input: string | Uint8Array,  inputEncoding: string = "utf8"): string {  return convertBase64ToBase64url(    typeof input === "object"      ? convertUint8ArrayToBase64(input)      : convertUint8ArrayToBase64(          inputEncoding === "hex"            ? convertHexToUint8Array(input)            : encode(input)        )  )}
function convertHexToUint8Array(hex: string): Uint8Array {  if (hex.length % 2 || !/^[0-9a-fA-F]+$/.test(hex))    throw new TypeError("Invalid hex string")  return Uint8Array.from(    [...hex].reduce((acc, el, i) => {      i % 2 === 0        ? (acc[acc.length] = el)        : (acc[acc.length - 1] = parseInt(acc[acc.length - 1] + el, 16))      return acc    }, [])  )}
function makeJwsSigningInput(header: Jose, claims: Claims): string {  return `${convertToBase64url(JSON.stringify(header))}.${convertToBase64url(    JSON.stringify(claims)  )}`}
function makeSignature(  alg: string,  key: string | Uint8Array,  msg: string | Uint8Array): string {  if (alg === "HS256")    return convertToBase64url(hmac("sha256", key, msg, "utf8", "hex"), "hex")  else if (alg === "HS512")    return convertToBase64url(hmac("sha512", key, msg, "utf8", "hex"), "hex")  else throw RangeError("no matching algorithm")}
function makeJwt(header: Jose, claims: Claims, key: string): string {  try {    const signingInput: string = makeJwsSigningInput(header, claims)    if (header.alg === "none") return `${signingInput}.`    else      return `${signingInput}.${makeSignature(header.alg, key, signingInput)}`  } catch (err) {    err.message = `Failed to create a JWT: ${err.message}`    throw err  }}
/* * Helper function: setExpiration() * returns the number of milliseconds since January 1, 1970, 00:00:00 UTC */function setExpiration(exp: number | Date): number {  return (exp instanceof Date ? exp : new Date(exp)).getTime()}
export default makeJwtexport { setExpiration, Claims, Jose }