cloudfunctions/ClearingRedundantFolders/node_modules/jsonwebtoken/verify.js

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var JsonWebTokenError = require('./lib/JsonWebTokenError');
var NotBeforeError    = require('./lib/NotBeforeError');
var TokenExpiredError = require('./lib/TokenExpiredError');
var decode            = require('./decode');
var timespan          = require('./lib/timespan');
var PS_SUPPORTED      = require('./lib/psSupported');
var jws               = require('jws');

var PUB_KEY_ALGS = ['RS256', 'RS384', 'RS512', 'ES256', 'ES384', 'ES512'];
var RSA_KEY_ALGS = ['RS256', 'RS384', 'RS512'];
var HS_ALGS = ['HS256', 'HS384', 'HS512'];

if (PS_SUPPORTED) {
  PUB_KEY_ALGS.splice(3, 0, 'PS256', 'PS384', 'PS512');
  RSA_KEY_ALGS.splice(3, 0, 'PS256', 'PS384', 'PS512');
}

module.exports = function (jwtString, secretOrPublicKey, options, callback) {
  if ((typeof options === 'function') && !callback) {
    callback = options;
    options = {};
  }

  if (!options) {
    options = {};
  }

  //clone this object since we are going to mutate it.
  options = Object.assign({}, options);

  var done;

  if (callback) {
    done = callback;
  } else {
    done = function(err, data) {
      if (err) throw err;
      return data;
    };
  }

  if (options.clockTimestamp && typeof options.clockTimestamp !== 'number') {
    return done(new JsonWebTokenError('clockTimestamp must be a number'));
  }

  if (options.nonce !== undefined && (typeof options.nonce !== 'string' || options.nonce.trim() === '')) {
    return done(new JsonWebTokenError('nonce must be a non-empty string'));
  }

  var clockTimestamp = options.clockTimestamp || Math.floor(Date.now() / 1000);

  if (!jwtString){
    return done(new JsonWebTokenError('jwt must be provided'));
  }

  if (typeof jwtString !== 'string') {
    return done(new JsonWebTokenError('jwt must be a string'));
  }

  var parts = jwtString.split('.');