angular-jwt.js

(function() {


// Create all modules and define dependencies to make sure they exist
// and are loaded in the correct order to satisfy dependency injection
// before all nested files are concatenated by Grunt

// Modules
angular.module('angular-jwt',
    [
        'angular-jwt.interceptor',
        'angular-jwt.jwt'
    ]);

 angular.module('angular-jwt.interceptor', [])
  .provider('jwtInterceptor', function() {

    this.authHeader = 'Authorization';
    this.authPrefix = 'Bearer ';
    this.tokenGetter = function() {
      return null;
    }

    var config = this;

    this.$get = ["$q", "$injector", "$rootScope", function ($q, $injector, $rootScope) {
      return {
        request: function (request) {
          if (request.skipAuthorization) {
            return request;
          }

          request.headers = request.headers || {};
          // Already has an Authorization header
          if (request.headers[config.authHeader]) {
            return request;
          }

          var tokenPromise = $q.when($injector.invoke(config.tokenGetter, this, {
            config: request
          }));

          return tokenPromise.then(function(token) {
            if (token) {
              request.headers[config.authHeader] = config.authPrefix + token;
            }
            return request;
          });
        },
        responseError: function (response) {
          // handle the case where the user is not authenticated
          if (response.status === 401) {
            $rootScope.$broadcast('unauthenticated', response);
          }
          return $q.reject(response);
        }
      };
    }];
  });

 angular.module('angular-jwt.jwt', [])
  .service('jwtHelper', function() {

    this.urlBase64Decode = function(str) {
      var output = str.replace('-', '+').replace('_', '/');
      switch (output.length % 4) {
        case 0: { break; }
        case 2: { output += '=='; break; }
        case 3: { output += '='; break; }
        default: {
          throw 'Illegal base64url string!';
        }
      }
      // return window.atob(output); //polifyll https://github.com/davidchambers/Base64.js
      return decodeURIComponent(escape(window.atob(output))); //polifyll https://github.com/davidchambers/Base64.js
    }


    this.decodeToken = function(token) {
      var parts = token.split('.');

      if (parts.length !== 3) {
        throw new Error('JWT must have 3 parts');
      }

      var decoded = this.urlBase64Decode(parts[1]);
      if (!decoded) {
        throw new Error('Cannot decode the token');
      }

      return JSON.parse(decoded);
    }

    this.getTokenExpirationDate = function(token) {
      var decoded;
      decoded = this.decodeToken(token);

      if(!decoded.exp) {
        return null;
      }

      var d = new Date(0); // The 0 here is the key, which sets the date to the epoch
      d.setUTCSeconds(decoded.exp);

      return d;
    };

    this.isTokenExpired = function(token) {
      var d = this.getTokenExpirationDate(token);

      if (!d) {
        return false;
      }

      // Token expired?
      return !(d.valueOf() > new Date().valueOf());
    };
  });

}());