caddybunnn

caddy.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+)
+
+func AddCaddyRoute(cfg *Config, fqdn string, port string) error {
+	if err := addCaddyAPIRoute(cfg, fqdn, port); err != nil {
+		return fmt.Errorf("caddy API: %w", err)
+	}
+
+	if err := appendCaddyfile(cfg, fqdn, port); err != nil {
+		return fmt.Errorf("caddyfile: %w", err)
+	}
+
+	return nil
+}
+
+func addCaddyAPIRoute(cfg *Config, fqdn string, port string) error {
+	route := map[string]interface{}{
+		"match": []map[string]interface{}{
+			{"host": []string{fqdn}},
+		},
+		"handle": []map[string]interface{}{
+			{
+				"handler": "reverse_proxy",
+				"upstreams": []map[string]string{
+					{"dial": "localhost:" + port},
+				},
+			},
+		},
+	}
+
+	payload, err := json.Marshal(route)
+	if err != nil {
+		return fmt.Errorf("marshaling route: %w", err)
+	}
+
+	url := cfg.CaddyAdminURL + "/config/apps/http/servers/srv0/routes"
+
+	req, err := http.NewRequest("POST", url, bytes.NewReader(payload))
+	if err != nil {
+		return fmt.Errorf("creating request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(body))
+	}
+
+	return nil
+}
+
+func appendCaddyfile(cfg *Config, fqdn string, port string) error {
+	block := fmt.Sprintf("\n%s {\n\treverse_proxy localhost:%s\n}\n", fqdn, port)
+
+	f, err := os.OpenFile(cfg.CaddyfilePath, os.O_APPEND|os.O_WRONLY, 0644)
+	if err != nil {
+		return fmt.Errorf("opening Caddyfile: %w", err)
+	}
+	defer f.Close()
+
+	if _, err := f.WriteString(block); err != nil {
+		return fmt.Errorf("writing to Caddyfile: %w", err)
+	}
+
+	return nil
+}