services: improve Oracle redirection check

Move IP check to later stage and do not resolve URI manually.

pkg/services/oracle/network_test.go

@@ -1,9 +1,13 @@
 package oracle
 
 import (
+	"errors"
 	"net"
+	"strings"
 	"testing"
+	"time"
 
+	"github.com/nspcc-dev/neo-go/pkg/config"
 	"github.com/stretchr/testify/require"
 )
 
@@ -16,3 +20,30 @@ func TestIsReserved(t *testing.T) {
 
 	require.False(t, isReserved(net.IPv4(8, 8, 8, 8)))
 }
+
+func TestDefaultClient_RestrictedRedirectErr(t *testing.T) {
+	cfg := config.OracleConfiguration{
+		AllowPrivateHost: false,
+		RequestTimeout:   time.Second,
+	}
+	cl := getDefaultClient(cfg)
+
+	testCases := []string{
+		"http://localhost:8080",
+		"http://localhost",
+		"https://localhost:443",
+		"https://" + net.IPv4zero.String(),
+		"https://" + net.IPv4(10, 0, 0, 1).String(),
+		"https://" + net.IPv4(192, 168, 0, 1).String(),
+		"https://[" + net.IPv6interfacelocalallnodes.String() + "]",
+		"https://[" + net.IPv6loopback.String() + "]",
+	}
+	for _, c := range testCases {
+		t.Run(c, func(t *testing.T) {
+			_, err := cl.Get(c)
+			require.Error(t, err)
+			require.True(t, errors.Is(err, ErrRestrictedRedirect), err)
+			require.True(t, strings.Contains(err.Error(), "IP is not global unicast"), err)
+		})
+	}
+}