feat: add stickers

internal/handler/chat.go

@@ -38,6 +38,8 @@ func writeChatError(w http.ResponseWriter, err error) {
 		response.Error(w, http.StatusNotFound, err.Error())
 	case errors.Is(err, service.ErrChatBadEntity):
 		response.Error(w, http.StatusBadRequest, err.Error())
+	case errors.Is(err, repository.ErrStickerNotOwned):
+		response.Error(w, http.StatusForbidden, "that sticker isn't in your collection")
 	case errors.Is(err, service.ErrChatBadEmoji):
 		response.Error(w, http.StatusBadRequest, err.Error())
 	case errors.Is(err, service.ErrChatBadQuote):
@@ -206,6 +208,8 @@ type sendReq struct {
 	// quote is a passage shared from the library. `path` must be app-relative;
 	// the service refuses anything that could navigate off-site.
 	Quote *quoteReq `json:"quote"`
+	// sticker_key sends reward artwork. Ownership is checked server-side.
+	StickerKey *string `json:"sticker_key"`
 	// entity shares something else in the app — a post — as a card. Only the
 	// reference; the BFF resolves the contents and re-checks visibility.
 	Entity    *entityReq `json:"entity"`
@@ -249,6 +253,7 @@ func (h *ChatHandler) Send(w http.ResponseWriter, r *http.Request) {
 		ReplyToID:   req.ReplyToID,
 		PreviewURL:  req.PreviewURL,
 		Quote:       quote,
+		StickerKey:  req.StickerKey,
 		Entity:      entity,
 		Attachments: media,
 	})
@@ -675,6 +680,38 @@ func (h *ChatHandler) MessageReactions(w http.ResponseWriter, r *http.Request) {
 	response.JSON(w, http.StatusOK, list)
 }
 
+// Stickers — GET /chat/stickers. What the caller may send.
+func (h *ChatHandler) Stickers(w http.ResponseWriter, r *http.Request) {
+	list, err := h.svc.Stickers(r.Context(), middleware.UserID(r.Context()))
+	if err != nil {
+		writeChatError(w, err)
+		return
+	}
+	response.JSON(w, http.StatusOK, list)
+}
+
+type saveStickerReq struct {
+	Key string `json:"key"`
+}
+
+// SaveSticker — POST /chat/conversations/{id}/messages/{messageID}/sticker
+//
+// Keyed to the message it was sent on, not just the sticker key: that is what
+// proves the caller was actually sent it rather than guessing at the catalog.
+func (h *ChatHandler) SaveSticker(w http.ResponseWriter, r *http.Request) {
+	var req saveStickerReq
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		response.Error(w, http.StatusBadRequest, "invalid JSON body")
+		return
+	}
+	if err := h.svc.SaveSticker(r.Context(), middleware.UserID(r.Context()),
+		chi.URLParam(r, "messageID"), req.Key); err != nil {
+		writeChatError(w, err)
+		return
+	}
+	response.NoContent(w)
+}
+
 // Typing — POST /chat/conversations/{id}/typing
 //
 // Fire-and-forget: nothing is stored and the response carries nothing, because