avoid 0.0.0.0 & replace by outbound ip

Signed-off-by: Christian Richter <crichter@owncloud.com>

ocis-pkg/checks/checkgrpc.go

@@ -3,15 +3,24 @@ package checks
 import (
 	"context"
 	"fmt"
+	"strings"
 
-	"google.golang.org/grpc/credentials/insecure"
-
+	"github.com/owncloud/ocis/v2/ocis-pkg/handlers"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 )
 
 // NewGRPCCheck checks the reachability of a grpc server.
 func NewGRPCCheck(address string) func(context.Context) error {
 	return func(_ context.Context) error {
+		if strings.Contains(address, "0.0.0.0") {
+			outboundIp, err := handlers.GetOutBoundIP()
+			if err != nil {
+				return err
+			}
+			address = strings.Replace(address, "0.0.0.0", outboundIp, 1)
+		}
+
 		conn, err := grpc.NewClient(address, grpc.WithTransportCredentials(insecure.NewCredentials()))
 		if err != nil {
 			return fmt.Errorf("could not connect to grpc server: %v", err)

ocis-pkg/checks/checkhttp.go

@@ -3,13 +3,27 @@ package checks
 import (
 	"context"
 	"fmt"
+	"github.com/owncloud/ocis/v2/ocis-pkg/handlers"
 	"net/http"
+	"strings"
 	"time"
 )
 
 // NewHTTPCheck checks the reachability of a http server.
 func NewHTTPCheck(url string) func(context.Context) error {
 	return func(_ context.Context) error {
+		if strings.Contains(url, "0.0.0.0") {
+			outboundIp, err := handlers.GetOutBoundIP()
+			if err != nil {
+				return err
+			}
+			url = strings.Replace(url, "0.0.0.0", outboundIp, 1)
+		}
+
+		if !strings.HasPrefix(url, "http://") && !strings.HasPrefix(url, "https://") {
+			url = "http://" + url
+		}
+
 		c := http.Client{
 			Timeout: 3 * time.Second,
 		}

ocis-pkg/handlers/checker.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"maps"
+	"net"
 	"net/http"
 
 	"golang.org/x/sync/errgroup"
@@ -113,3 +114,20 @@ func (h *CheckHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		h.conf.logger.Panic().Err(err).Msg("failed to write response")
 	}
 }
+
+func GetOutBoundIP() (string, error) {
+	interfacesAddresses, err := net.InterfaceAddrs()
+	if err != nil {
+		return "", err
+	}
+
+	for _, address := range interfacesAddresses {
+		if ipNet, ok := address.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
+			if ipNet.IP.To4() != nil {
+				return ipNet.IP.String(), nil
+			}
+		}
+	}
+
+	return "", fmt.Errorf("no IP found")
+}