Set shortcodes in trigger response entities based on config or request URL (#1099)

* adding trigger short code injection

* more annotation provider stuff

* fixed up tests

* Fix validator

api/server/trigger_get.go

@@ -3,6 +3,7 @@ package server
 import (
 	"net/http"
 
+	"fmt"
 	"github.com/fnproject/fn/api"
 	"github.com/gin-gonic/gin"
 )
@@ -11,10 +12,18 @@ func (s *Server) handleTriggerGet(c *gin.Context) {
 	ctx := c.Request.Context()
 
 	trigger, err := s.datastore.GetTriggerByID(ctx, c.Param(api.ParamTriggerID))
+
 	if err != nil {
 		handleErrorResponse(c, err)
 		return
 	}
+	app, err := s.datastore.GetAppByID(ctx, trigger.AppID)
+
+	if err != nil {
+		handleErrorResponse(c, fmt.Errorf("unexpected error - trigger app not available: %s", err))
+	}
+
+	s.triggerAnnotator.AnnotateTrigger(c, app, trigger)
 
 	c.JSON(http.StatusOK, trigger)
 }