123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111
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)    throw new RangeError("String length is not an even number")  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.toString(),            16          ))      return acc    }, [])  )}
function makeJwsSigningInput(  encodedHeader: string,  encodedPayload: string): string {  return `${encodedHeader}.${encodedPayload}`}
function makeHmacSignature(  hash: string,  key: string | Uint8Array,  msg: string | Uint8Array): string | Uint8Array {  return hmac(hash, key, msg, "utf8", "hex")}
function makeSignature(  alg: string,  key: string | Uint8Array,  msg: string | Uint8Array): string | Uint8Array {  if (alg === "HS256") return makeHmacSignature("sha256", key, msg)  if (alg === "HS512") return makeHmacSignature("sha512", key, msg)  throw RangeError("no matching algorithm")}
/* * Helper function: setExpiration() * returns the number of milliseconds since January 1, 1970, 00:00:00 UTC * Examples: * A specific date: setExpiration(new Date('2020-07-01')); * One hour from now: setExpiration(new Date().getTime() + (60*60*1000)); */function setExpiration(exp: number | Date): number {  return (exp instanceof Date ? exp : new Date(exp)).getTime()}
function makeJwt(  headerObject: Jose,  claims: Claims, // | string = "",  key: string): string {  try {    const encodedHeader = convertToBase64url(JSON.stringify(headerObject))    const encodedPayload = convertToBase64url(JSON.stringify(claims))    const signingInput = makeJwsSigningInput(encodedHeader, encodedPayload)    if (headerObject.alg === "none") return `${signingInput}.`    const signature = makeSignature(headerObject.alg, key, signingInput)    const encodedSignature = convertToBase64url(signature, "hex")    return `${signingInput}.${encodedSignature}`  } catch (err) {    err.message = `Failed to create a JWT: ${err.message}`    throw err  }}
export default makeJwtexport { setExpiration, Claims, Jose }