Handle user not found error and only return user's public info

handlers/user.go

@@ -6,18 +6,31 @@ import (
 	"net/http"
 
 	"github.com/gorilla/mux"
+	"github.com/play-with-docker/play-with-docker/storage"
 )
 
+type PublicUserInfo struct {
+	Id     string `json:"id"`
+	Avatar string `json:"avatar"`
+	Name   string `json:"name"`
+}
+
 func GetUser(rw http.ResponseWriter, req *http.Request) {
 	vars := mux.Vars(req)
 	userId := vars["userId"]
 
 	u, err := core.UserGet(userId)
 	if err != nil {
+		if storage.NotFound(err) {
+			log.Printf("User with id %s was not found\n", userId)
+			rw.WriteHeader(http.StatusNotFound)
+			return
+		}
 		log.Println(err)
 		rw.WriteHeader(http.StatusInternalServerError)
 		return
 	}
 
-	json.NewEncoder(rw).Encode(u)
+	pui := PublicUserInfo{Id: u.Id, Avatar: u.Avatar, Name: u.Name}
+	json.NewEncoder(rw).Encode(pui)
 }