Initial commit

internal/ntfy/client.go

@@ -0,0 +1,98 @@
+package ntfy
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+	"strings"
+	"time"
+)
+
+type Client struct {
+	BaseURL string
+	Token   string
+	HTTP    *http.Client
+}
+
+func New(baseURL string) *Client {
+	return &Client{
+		BaseURL: strings.TrimRight(baseURL, "/"),
+		HTTP:    &http.Client{Timeout: 15 * time.Second},
+	}
+}
+
+// NewWithToken returns a ntfy Client with bearer-token auth set. Use this
+// when the ntfy server requires authentication.
+func NewWithToken(baseURL, token string) *Client {
+	c := New(baseURL)
+	c.Token = strings.TrimSpace(token)
+	return c
+}
+
+type Notification struct {
+	Topic    string
+	Title    string
+	Message  string
+	Priority string
+	Tags     []string
+	Click    string
+}
+
+// Send publishes to ntfy using the topic-path + header style
+// (POST {base}/{topic} with metadata in HTTP headers and the message as the
+// raw body). This is the most broadly compatible ntfy publish method —
+// works on every ntfy version including self-hosted, and on any path layout
+// the server is mounted under.
+func (c *Client) Send(ctx context.Context, n Notification) error {
+	if c.BaseURL == "" {
+		return fmt.Errorf("ntfy base_url not configured")
+	}
+	if n.Topic == "" {
+		return fmt.Errorf("ntfy topic required")
+	}
+	url := c.BaseURL + "/" + strings.TrimLeft(n.Topic, "/")
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, strings.NewReader(n.Message))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "text/plain; charset=utf-8")
+	if c.Token != "" {
+		req.Header.Set("Authorization", "Bearer "+c.Token)
+	}
+	if n.Title != "" {
+		req.Header.Set("Title", n.Title)
+	}
+	if n.Priority != "" {
+		req.Header.Set("Priority", n.Priority)
+	}
+	if len(n.Tags) > 0 {
+		req.Header.Set("Tags", strings.Join(n.Tags, ","))
+	}
+	if n.Click != "" {
+		req.Header.Set("Click", n.Click)
+	}
+	tokenLen := len(c.Token)
+	tokenPrefix := ""
+	if tokenLen >= 4 {
+		tokenPrefix = c.Token[:4]
+	}
+	slog.Info("ntfy publish",
+		"url", url,
+		"topic", n.Topic,
+		"auth_header_set", c.Token != "",
+		"token_prefix", tokenPrefix,
+		"token_len", tokenLen,
+	)
+	resp, err := c.HTTP.Do(req)
+	if err != nil {
+		return fmt.Errorf("ntfy POST: %w", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 300 {
+		b, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
+		return fmt.Errorf("ntfy returned %d: %s", resp.StatusCode, string(b))
+	}
+	return nil
+}