Adding upstream version 0.8.9.

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

pkg/services/rocketchat/rocketchat_json.go

@@ -0,0 +1,41 @@
+package rocketchat
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/nicholas-fedor/shoutrrr/pkg/types"
+)
+
+// JSON represents the payload structure for the Rocket.Chat service.
+type JSON struct {
+	Text     string `json:"text"`
+	UserName string `json:"username,omitempty"`
+	Channel  string `json:"channel,omitempty"`
+}
+
+// CreateJSONPayload generates a JSON payload compatible with the Rocket.Chat webhook API.
+func CreateJSONPayload(config *Config, message string, params *types.Params) ([]byte, error) {
+	payload := JSON{
+		Text:     message,
+		UserName: config.UserName,
+		Channel:  config.Channel,
+	}
+
+	if params != nil {
+		if value, found := (*params)["username"]; found {
+			payload.UserName = value
+		}
+
+		if value, found := (*params)["channel"]; found {
+			payload.Channel = value
+		}
+	}
+
+	payloadBytes, err := json.Marshal(payload)
+	if err != nil {
+		return nil, fmt.Errorf("marshaling Rocket.Chat payload to JSON: %w", err)
+	}
+
+	return payloadBytes, nil
+}