Adding upstream version 0.8.9.

Signed-off-by: Daniel Baumann <daniel@debian.org>

pkg/services/telegram/telegram.go

@@ -0,0 +1,89 @@
+package telegram
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/nicholas-fedor/shoutrrr/pkg/format"
+	"github.com/nicholas-fedor/shoutrrr/pkg/services/standard"
+	"github.com/nicholas-fedor/shoutrrr/pkg/types"
+)
+
+// apiFormat defines the Telegram API endpoint template.
+const (
+	apiFormat = "https://api.telegram.org/bot%s/%s"
+	maxlength = 4096
+)
+
+// ErrMessageTooLong indicates that the message exceeds the maximum allowed length.
+var (
+	ErrMessageTooLong = errors.New("Message exceeds the max length")
+)
+
+// Service sends notifications to configured Telegram chats.
+type Service struct {
+	standard.Standard
+	Config *Config
+	pkr    format.PropKeyResolver
+}
+
+// Send delivers a notification message to Telegram.
+func (service *Service) Send(message string, params *types.Params) error {
+	if len(message) > maxlength {
+		return ErrMessageTooLong
+	}
+
+	config := *service.Config
+	if err := service.pkr.UpdateConfigFromParams(&config, params); err != nil {
+		return fmt.Errorf("updating config from params: %w", err)
+	}
+
+	return service.sendMessageForChatIDs(message, &config)
+}
+
+// Initialize configures the service with a URL and logger.
+func (service *Service) Initialize(configURL *url.URL, logger types.StdLogger) error {
+	service.SetLogger(logger)
+	service.Config = &Config{
+		Preview:      true,
+		Notification: true,
+	}
+	service.pkr = format.NewPropKeyResolver(service.Config)
+
+	if err := service.Config.setURL(&service.pkr, configURL); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// GetID returns the identifier for this service.
+func (service *Service) GetID() string {
+	return Scheme
+}
+
+// sendMessageForChatIDs sends the message to all configured chat IDs.
+func (service *Service) sendMessageForChatIDs(message string, config *Config) error {
+	for _, chat := range service.Config.Chats {
+		if err := sendMessageToAPI(message, chat, config); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// GetConfig returns the current configuration for the service.
+func (service *Service) GetConfig() *Config {
+	return service.Config
+}
+
+// sendMessageToAPI sends a message to the Telegram API for a specific chat.
+func sendMessageToAPI(message string, chat string, config *Config) error {
+	client := &Client{token: config.Token}
+	payload := createSendMessagePayload(message, chat, config)
+	_, err := client.SendMessage(&payload)
+
+	return err
+}