func grantAppAccess(w http.ResponseWriter, r *http.Request, t auth.Token) (err error) {
	appName := r.URL.Query().Get(":app")
	teamName := r.URL.Query().Get(":team")
	a, err := getAppFromContext(appName, r)
	if err != nil {
		return err
	}
	allowed := permission.Check(t, permission.PermAppUpdateGrant,
		contextsForApp(&a)...,
	)
	if !allowed {
		return permission.ErrUnauthorized
	}
	evt, err := event.New(&event.Opts{
		Target:     appTarget(appName),
		Kind:       permission.PermAppUpdateGrant,
		Owner:      t,
		CustomData: event.FormToCustomData(InputFields(r)),
		Allowed:    event.Allowed(permission.PermAppReadEvents, contextsForApp(&a)...),
	})
	if err != nil {
		return err
	}
	defer func() { evt.Done(err) }()
	team, err := servicemanager.Team.FindByName(teamName)
	if err != nil {
		return &errors.HTTP{Code: http.StatusNotFound, Message: "Team not found"}
	}
	err = a.Grant(team)
	if err == app.ErrAlreadyHaveAccess {
		return &errors.HTTP{Code: http.StatusConflict, Message: err.Error()}
	}
	return err
}
func grantAppAccess(w http.ResponseWriter, r *http.Request, t auth.Token) (err error) {
	appName := r.URL.Query().Get(":app")
	teamName := r.URL.Query().Get(":team")
	a, err := getAppFromContext(appName, r)
	if err != nil {
		return err
	}
	allowed := permission.Check(t, permission.PermAppUpdateGrant,
		contextsForApp(&a)...,
	)
	if !allowed {
		return permission.ErrUnauthorized
	}
	evt, err := event.New(&event.Opts{
		Target:     appTarget(appName),
		Kind:       permission.PermAppUpdateGrant,
		Owner:      t,
		CustomData: event.FormToCustomData(InputFields(r)),
		Allowed:    event.Allowed(permission.PermAppReadEvents, contextsForApp(&a)...),
	})
	if err != nil {
		return err
	}
	defer func() { evt.Done(err) }()
	team, err := servicemanager.Team.FindByName(teamName)
	if err != nil {
		return &errors.HTTP{Code: http.StatusNotFound, Message: "Team not found"}
	}
	err = a.Grant(team)
	if err == app.ErrAlreadyHaveAccess {
		return &errors.HTTP{Code: http.StatusConflict, Message: err.Error()}
	}
	return err
}
// title: grant access to app
// path: /apps/{app}/teams/{team}
// method: PUT
// responses:
//   200: Access granted
//   401: Unauthorized
//   404: App or team not found
//   409: Grant already exists