[MM-14333] Stricten external HTTP Calls to require that own IPs need to be explicitly whitelisted (#10375)

* Stricten external HTTP Calls to require that own IPs need to be explicitly whitelisted

* gofmt

* Documentation; Style fixes for IsOwnIP function

services/httpservice/client_test.go

@@ -145,3 +145,44 @@ func NewHTTPClient(transport http.RoundTripper) *http.Client {
 		Transport: transport,
 	}
 }
+
+func TestIsReservedIP(t *testing.T) {
+	tests := []struct {
+		name string
+		ip net.IP
+		want bool
+	}{
+		{"127.8.3.5", net.IPv4(127, 8, 3, 5), true},
+		{"192.168.0.1", net.IPv4(192, 168, 0, 1), true},
+		{"169.254.0.6", net.IPv4(169, 254, 0, 6), true},
+		{"127.120.6.3", net.IPv4(127, 120, 6, 3), true},
+		{"8.8.8.8", net.IPv4(8, 8, 8, 8), false},
+		{"9.9.9.9", net.IPv4(9, 9, 9, 8), false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsReservedIP(tt.ip); got != tt.want {
+				t.Errorf("IsReservedIP() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsOwnIP(t *testing.T) {
+	tests := []struct {
+		name string
+		ip net.IP
+		want bool
+	}{
+		{"127.0.0.1", net.IPv4(127, 0, 0, 1), true},
+		{"8.8.8.8", net.IPv4(8, 0, 0, 8), false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got, _ := IsOwnIP(tt.ip); got != tt.want {
+				t.Errorf("IsOwnIP() = %v, want %v", got, tt.want)
+				t.Errorf(tt.ip.String());
+			}
+		})
+	}
+}