goa: Add support for certificate prompts

Since commit f5ee590e, it is not possible to access Nextcloud/ownCloud
shares with self-signed (or invalid) certificates. This is because
the mount operation is handled by GOA volume monitor and the prompt
to accept certificate is not shown. Let's update the volume monitor
to handle just passwords and show the prompt to the client.

Fixes: https://gitlab.gnome.org/GNOME/gvfs/issues/251

1 files changed, 96 insertions, 2 deletions

diff --git a/monitor/goa/goavolume.c b/monitor/goa/goavolume.c
index c077dd94..5e9097c6 100644
--- a/monitor/goa/goavolume.c
+++ b/monitor/goa/goavolume.c
@@ -64,6 +64,7 @@ G_DEFINE_TYPE_EXTENDED (GVfsGoaVolume, g_vfs_goa_volume, G_TYPE_OBJECT, 0,
 typedef struct
 {
   GMountOperation *mount_operation;
+  GMountOperation *mount_operation_orig;
   gchar *passwd;
 } MountOp;
 
@@ -72,6 +73,13 @@ mount_op_free (MountOp *data)
 {
   g_clear_object (&data->mount_operation);
   g_free (data->passwd);
+
+  if (data->mount_operation_orig != NULL)
+    {
+      g_signal_handlers_disconnect_by_data (data->mount_operation_orig, data);
+      g_object_unref (data->mount_operation_orig);
+    }
+
   g_slice_free (MountOp, data);
 }
 
@@ -97,6 +105,88 @@ account_attention_needed_cb (GObject *_object, GParamSpec *pspec, gpointer user_
 
 /* ---------------------------------------------------------------------------------------------------- */
 
+GType g_vfs_goa_mount_operation_get_type (void) G_GNUC_CONST;
+
+typedef struct
+{
+  GMountOperation parent_instance;
+} GVfsGoaMountOperation;
+
+typedef struct
+{
+  GMountOperationClass parent_class;
+} GVfsGoaMountOperationClass;
+
+static GMountOperation *
+g_vfs_goa_mount_operation_new (void)
+{
+  return G_MOUNT_OPERATION (g_object_new (g_vfs_goa_mount_operation_get_type (), NULL));
+}
+
+G_DEFINE_TYPE (GVfsGoaMountOperation, g_vfs_goa_mount_operation, G_TYPE_MOUNT_OPERATION)
+
+static void
+g_vfs_goa_mount_operation_init (GVfsGoaMountOperation *mount_operation)
+{
+}
+
+static void
+g_vfs_goa_mount_operation_ask_question (GMountOperation *op,
+                                        const char *message,
+                                        const char *choices[])
+{
+  /* This is needed to prevent G_MOUNT_OPERATION_UNHANDLED reply in idle. */
+}
+
+static void
+g_vfs_goa_mount_operation_class_init (GVfsGoaMountOperationClass *klass)
+{
+  GMountOperationClass *mount_op_class;
+
+  mount_op_class = G_MOUNT_OPERATION_CLASS (klass);
+  mount_op_class->ask_question  = g_vfs_goa_mount_operation_ask_question;
+}
+
+/* ---------------------------------------------------------------------------------------------------- */
+
+static void
+ask_question_reply_cb (GMountOperation      *op,
+                       GMountOperationResult result,
+                       gpointer              user_data)
+{
+  MountOp *data = g_task_get_task_data (user_data);
+
+  g_mount_operation_set_choice (data->mount_operation,
+                                g_mount_operation_get_choice (op));
+  g_mount_operation_reply (data->mount_operation, result);
+}
+
+static void
+mount_operation_ask_question_cb (GMountOperation *op,
+                                 gchar           *message,
+                                 GStrv            choices,
+                                 gpointer         user_data)
+{
+  MountOp *data = g_task_get_task_data (user_data);
+
+  if (data->mount_operation_orig != NULL)
+    {
+      g_signal_connect (data->mount_operation_orig,
+                        "reply",
+                        G_CALLBACK (ask_question_reply_cb),
+                        user_data);
+      g_signal_emit_by_name (data->mount_operation_orig,
+                             "ask-question",
+                             message,
+                             choices);
+    }
+  else
+    {
+      g_mount_operation_reply (data->mount_operation,
+                               G_MOUNT_OPERATION_UNHANDLED);
+    }
+}
+
 static void
 mount_operation_ask_password_cb (GMountOperation   *op,
                                  gchar             *message,
@@ -412,7 +502,7 @@ g_vfs_goa_volume_get_uuid (GVolume *_self)
 static void
 g_vfs_goa_volume_mount (GVolume             *_self,
                         GMountMountFlags     flags,
-                        GMountOperation     *mount_operation,
+                        GMountOperation     *mount_operation_orig,
                         GCancellable        *cancellable,
                         GAsyncReadyCallback  callback,
                         gpointer             user_data)
@@ -423,6 +513,9 @@ g_vfs_goa_volume_mount (GVolume             *_self,
   GoaAccount *account;
 
   data = g_slice_new0 (MountOp);
+  if (mount_operation_orig != NULL)
+    data->mount_operation_orig = g_object_ref (mount_operation_orig);
+
   task = g_task_new (self, cancellable, callback, user_data);
   g_task_set_source_tag (task, g_vfs_goa_volume_mount);
   g_task_set_task_data (task, data, (GDestroyNotify) mount_op_free);
@@ -431,8 +524,9 @@ g_vfs_goa_volume_mount (GVolume             *_self,
    * monitor because it is set up to emit MountOpAskPassword on
    * ask-password.
    */
-  data->mount_operation = g_mount_operation_new ();
+  data->mount_operation = g_vfs_goa_mount_operation_new ();
   g_signal_connect (data->mount_operation, "ask-password", G_CALLBACK (mount_operation_ask_password_cb), task);
+  g_signal_connect (data->mount_operation, "ask-question", G_CALLBACK (mount_operation_ask_question_cb), task);
 
   account = goa_object_peek_account (self->object);
   goa_account_call_ensure_credentials (account, cancellable, ensure_credentials_cb, task);