Initial commit: Beszel fork with Domain Locker integration

internal/hub/notifications/providers/slack.go

@@ -0,0 +1,101 @@
+package providers
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/henrygd/beszel/internal/entities/notification"
+)
+
+type SlackProvider struct {
+	settings notification.SlackSettings
+}
+
+func NewSlackProvider(settings notification.SlackSettings) *SlackProvider {
+	return &SlackProvider{settings: settings}
+}
+
+func (p *SlackProvider) Validate() error {
+	if p.settings.WebhookURL == "" {
+		return fmt.Errorf("Slack webhook URL is required")
+	}
+	return nil
+}
+
+func (p *SlackProvider) Send(msg *notification.NotificationMessage) error {
+	if err := p.Validate(); err != nil {
+		return err
+	}
+
+	color := "good" // Green for UP
+	if msg.Status == "DOWN" {
+		color = "danger" // Red for DOWN
+	}
+
+	fields := []map[string]string{
+		{
+			"title": "Monitor",
+			"value": msg.MonitorName,
+			"short": "true",
+		},
+		{
+			"title": "Status",
+			"value": msg.Status,
+			"short": "true",
+		},
+	}
+
+	if msg.MonitorURL != "" {
+		fields = append(fields, map[string]string{
+			"title": "URL",
+			"value": msg.MonitorURL,
+			"short": "false",
+		})
+	}
+
+	payload := map[string]interface{}{
+		"attachments": []map[string]interface{}{
+			{
+				"color":     color,
+				"title":     msg.Title,
+				"text":      msg.Body,
+				"fields":    fields,
+				"timestamp": msg.Timestamp.Unix(),
+			},
+		},
+	}
+
+	if p.settings.Username != "" {
+		payload["username"] = p.settings.Username
+	}
+	if p.settings.Channel != "" {
+		payload["channel"] = p.settings.Channel
+	}
+
+	jsonData, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("failed to marshal payload: %w", err)
+	}
+
+	req, err := http.NewRequest("POST", p.settings.WebhookURL, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	client := &http.Client{Timeout: 30 * time.Second}
+	resp, err := client.Do(req)
+	if err != nil {
+		return fmt.Errorf("slack webhook request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("slack webhook returned status %d", resp.StatusCode)
+	}
+
+	return nil
+}