Are you using routeProvider?  I guess you could setup 'resolve' property in 
the route, check this out 
https://docs.angularjs.org/api/ngRoute/provider/$routeProvider

            when('/somepath', {
                templateUrl: 'tpl/secure.html',
                controller: 'MyCtrl',
                resolve: function (nameOfService) {return 
nameOfService.getAuthToken()}
            }).

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