Public IP endpoint with GET /ip fixing #319

internal/server/publicip.go

@@ -0,0 +1,55 @@
+//nolint:dupl
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	"github.com/qdm12/gluetun/internal/publicip"
+	"github.com/qdm12/golibs/logging"
+)
+
+func newPublicIPHandler(
+	looper publicip.Looper,
+	logger logging.Logger) http.Handler {
+	return &publicIPHandler{
+		looper: looper,
+		logger: logger,
+	}
+}
+
+type publicIPHandler struct {
+	looper publicip.Looper
+	logger logging.Logger
+}
+
+func (h *publicIPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	r.RequestURI = strings.TrimPrefix(r.RequestURI, "/publicip")
+	switch r.RequestURI {
+	case "/ip":
+		switch r.Method {
+		case http.MethodGet:
+			h.getPublicIP(w)
+		default:
+			http.Error(w, "", http.StatusNotFound)
+		}
+	default:
+		http.Error(w, "", http.StatusNotFound)
+	}
+}
+
+type publicIPWrapper struct {
+	PublicIP string `json:"public_ip"`
+}
+
+func (h *publicIPHandler) getPublicIP(w http.ResponseWriter) {
+	publicIP := h.looper.GetPublicIP()
+	encoder := json.NewEncoder(w)
+	data := publicIPWrapper{PublicIP: publicIP.String()}
+	if err := encoder.Encode(data); err != nil {
+		h.logger.Warn(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+}