init work of uptime

internal/alert/ntfy.go

@@ -0,0 +1,47 @@
+package alert
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// NtfyAlerter sends notifications via ntfy.sh or a self-hosted ntfy server.
+// The URL should be the full topic URL, e.g. "https://ntfy.sh/my-topic".
+type NtfyAlerter struct {
+	url    string
+	token  string // optional Bearer token
+	client *http.Client
+}
+
+func NewNtfyAlerter(url, token string) *NtfyAlerter {
+	return &NtfyAlerter{
+		url:    url,
+		token:  token,
+		client: &http.Client{Timeout: 10 * time.Second},
+	}
+}
+
+func (n *NtfyAlerter) Send(subject, body string) error {
+	req, err := http.NewRequest(http.MethodPost, n.url, strings.NewReader(body))
+	if err != nil {
+		return fmt.Errorf("build ntfy request: %w", err)
+	}
+	req.Header.Set("Content-Type", "text/plain")
+	req.Header.Set("Title", subject)
+	if n.token != "" {
+		req.Header.Set("Authorization", "Bearer "+n.token)
+	}
+
+	resp, err := n.client.Do(req)
+	if err != nil {
+		return fmt.Errorf("post ntfy: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 300 {
+		return fmt.Errorf("ntfy returned %d", resp.StatusCode)
+	}
+	return nil
+}