Allow assistant photo directives

internal/telegram/api.go

@@ -144,6 +144,52 @@ func (c *Client) DownloadFile(ctx context.Context, filePath string) ([]byte, err
 	return io.ReadAll(resp.Body)
 }
 
+func (c *Client) SendPhotoBytes(ctx context.Context, chatID int64, filename string, data []byte, caption string) (Message, error) {
+	var body bytes.Buffer
+	writer := multipart.NewWriter(&body)
+	if err := writer.WriteField("chat_id", fmt.Sprint(chatID)); err != nil {
+		return Message{}, err
+	}
+	if caption != "" {
+		if err := writer.WriteField("caption", caption); err != nil {
+			return Message{}, err
+		}
+	}
+	part, err := writer.CreateFormFile("photo", filepath.Base(filename))
+	if err != nil {
+		return Message{}, err
+	}
+	if _, err := part.Write(data); err != nil {
+		return Message{}, err
+	}
+	if err := writer.Close(); err != nil {
+		return Message{}, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.baseURL+"/sendPhoto", &body)
+	if err != nil {
+		return Message{}, err
+	}
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return Message{}, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		payload, _ := io.ReadAll(io.LimitReader(resp.Body, 4096))
+		return Message{}, fmt.Errorf("sendPhoto: telegram returned %s: %s", resp.Status, string(payload))
+	}
+	var decoded apiResponse[Message]
+	if err := json.NewDecoder(resp.Body).Decode(&decoded); err != nil {
+		return Message{}, err
+	}
+	if !decoded.OK {
+		return Message{}, fmt.Errorf("sendPhoto: telegram error %d: %s", decoded.ErrorCode, decoded.Description)
+	}
+	return decoded.Result, nil
+}
+
 func (c *Client) SendDocumentBytes(ctx context.Context, chatID int64, filename string, data []byte, caption string) (Message, error) {
 	var body bytes.Buffer
 	writer := multipart.NewWriter(&body)