Collect calories stat from Strava during export

Strava does provide information about how many calories user spent during
activity only when details on specific activity is requested.

Additional API call was added to request activity details during downloading
activity in order to obtain calories information.

Previous behavior was to collect calories stats from the response to request
of the list of user activities which doesn't contain this information.

Closes #353

tapiriik/services/Strava/strava.py

@@ -174,8 +174,6 @@ def DownloadActivityList(self, svcRecord, exhaustive=False):
                     activity.Stats.Cadence.update(ActivityStatistic(ActivityStatisticUnit.RevolutionsPerMinute, avg=ride["average_cadence"]))
                 if "average_temp" in ride:
                     activity.Stats.Temperature.update(ActivityStatistic(ActivityStatisticUnit.DegreesCelcius, avg=ride["average_temp"]))
-                if "calories" in ride:
-                    activity.Stats.Energy = ActivityStatistic(ActivityStatisticUnit.Kilocalories, value=ride["calories"])
                 activity.Name = ride["name"]
                 activity.Private = ride["private"]
                 activity.Stationary = ride["manual"]
@@ -216,6 +214,18 @@ def DownloadActivity(self, svcRecord, activity):
             return activity
         activityID = activity.ServiceData["ActivityID"]
 
+        #Note (smelikyan): request activity details in order to extract calories stat
+        details = requests.get("https://www.strava.com/api/v3/activities/" + str(activityID), headers=self._apiHeaders(svcRecord))
+        if details.status_code == 401:
+            raise APIException("No authorization to download activity", block=True, user_exception=UserException(UserExceptionType.Authorization, intervention_required=True))
+        try:
+            details = details.json()
+        except ValueError:
+            raise APIException("Activity details data returned is not JSON")
+
+        if "calories" in details:
+            activity.Stats.Energy = ActivityStatistic(ActivityStatisticUnit.Kilocalories, value=details["calories"])
+
         streamdata = requests.get("https://www.strava.com/api/v3/activities/" + str(activityID) + "/streams/time,altitude,heartrate,cadence,watts,temp,moving,latlng,distance,velocity_smooth", headers=self._apiHeaders(svcRecord))
         if streamdata.status_code == 401:
             raise APIException("No authorization to download activity", block=True, user_exception=UserException(UserExceptionType.Authorization, intervention_required=True))