feat: vani of the day edit

internal/handler/vani.go

@@ -58,6 +58,36 @@ func (h *VaniHandler) Set(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+type setVaniByURLReq struct {
+	Day string `json:"day"`
+	URL string `json:"url"`
+}
+
+// SetByURL — POST /admin/vani/by-url. Pins whatever a link points at.
+func (h *VaniHandler) SetByURL(w http.ResponseWriter, r *http.Request) {
+	var req setVaniByURLReq
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		response.Error(w, http.StatusBadRequest, "invalid JSON body")
+		return
+	}
+	day, err := parseVaniDay(req.Day)
+	if err != nil {
+		response.Error(w, http.StatusBadRequest, "day must be YYYY-MM-DD")
+		return
+	}
+	pick, err := h.svc.SetByURL(r.Context(), req.URL, day)
+	if err != nil {
+		writeVaniError(w, err)
+		return
+	}
+	response.JSON(w, http.StatusOK, map[string]any{
+		"day":     pick.Day.Format("2006-01-02"),
+		"kind":    pick.Kind,
+		"ref_id":  pick.RefID,
+		"payload": pick.Payload,
+	})
+}
+
 // Clear — DELETE /admin/vani/{day}. Hands the day back to the random picker.
 func (h *VaniHandler) Clear(w http.ResponseWriter, r *http.Request) {
 	day, err := parseVaniDay(chi.URLParam(r, "day"))
@@ -103,7 +133,9 @@ func parseVaniDay(s string) (time.Time, error) {
 
 func writeVaniError(w http.ResponseWriter, err error) {
 	switch {
-	case errors.Is(err, repository.ErrVaniRefInvalid), errors.Is(err, service.ErrVaniBadKind):
+	case errors.Is(err, repository.ErrVaniRefInvalid),
+		errors.Is(err, service.ErrVaniBadKind),
+		errors.Is(err, service.ErrVaniBadURL):
 		response.Error(w, http.StatusBadRequest, err.Error())
 	case errors.Is(err, repository.ErrVaniRefNotFound):
 		response.Error(w, http.StatusNotFound, err.Error())