[gvfs] dav: better error handling during mount

[Ondrej Holy <oholy src gnome org>]

commit 99223f68c7d777dfca44d5d0fd8bbe0bb7640923
Author: Christian Kellner <gicmo gnome org>
Date:   Tue Aug 23 06:11:11 2016 +0200

    dav: better error handling during mount
    
    If we can detect that a location is not a webdav share then prefer
    that error message over any other. For other error cases also take
    errors from the PROPFIND call into account. Translate the status
    code into a proper GIO error code.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770549

 daemon/gvfsbackenddav.c |   61 ++++++++++++++++++++++++++++++++--------------
 1 files changed, 42 insertions(+), 19 deletions(-)
---
diff --git a/daemon/gvfsbackenddav.c b/daemon/gvfsbackenddav.c
index b3aa2c9..10e7c97 100644
--- a/daemon/gvfsbackenddav.c
+++ b/daemon/gvfsbackenddav.c
@@ -1887,7 +1887,8 @@ do_mount (GVfsBackend  *backend,
   do {
     GFileType file_type;
     SoupURI *cur_uri;
- 
+
+    res = TRUE;
     status = g_vfs_backend_dav_send_message (backend, msg_opts);
     is_success = SOUP_STATUS_IS_SUCCESSFUL (status);
 
@@ -1917,14 +1918,15 @@ do_mount (GVfsBackend  *backend,
             break;
           }
       }
-    is_webdav = is_success && sm_has_header (msg_opts, "DAV");
 
-    soup_message_headers_clear (msg_opts->response_headers);
-    soup_message_body_truncate (msg_opts->response_body);
+    is_webdav = sm_has_header (msg_opts, "DAV");
 
-    if (is_webdav == FALSE)
+    if (!is_success || !is_webdav)
       break;
 
+    soup_message_headers_clear (msg_opts->response_headers);
+    soup_message_body_truncate (msg_opts->response_body);
+
     cur_uri = soup_message_get_uri (msg_opts);
     soup_message_set_uri (msg_stat, cur_uri);
 
@@ -1970,25 +1972,46 @@ do_mount (GVfsBackend  *backend,
      chdir up to (or couldn't chdir up at all) */
 
   /* check if we at all have a good path */
-  if (last_good_path == NULL) 
-    {
-
-      /* TODO: set correct error in case of cancellation */
-      if (!is_success) 
-        g_vfs_job_failed (G_VFS_JOB (job),
-                          G_IO_ERROR, G_IO_ERROR_FAILED,
-                          _("HTTP Error: %s"), msg_opts->reason_phrase);
-      else if (!is_webdav)
-        g_vfs_job_failed (G_VFS_JOB (job),
-                          G_IO_ERROR, G_IO_ERROR_FAILED,
-                          _("Not a WebDAV enabled share"));
+  if (last_good_path == NULL)
+    {
+      if ((is_success && !is_webdav) ||
+          msg_opts->status_code == SOUP_STATUS_METHOD_NOT_ALLOWED)
+        {
+          /* This means the either: a) OPTIONS request succeeded
+             (which should be the case even for non-existent
+             resources on a webdav enabled share) but we did not
+             get the DAV header. Or b) the OPTIONS request was a
+             METHOD_NOT_ALLOWED (405).
+             Prioritize this error messages, because it seems most
+             useful to the user. */
+          g_vfs_job_failed (G_VFS_JOB (job),
+                            G_IO_ERROR, G_IO_ERROR_FAILED,
+                            _("Not a WebDAV enabled share"));
+        }
+      else if (!is_success || !res)
+        {
+          /* Either the OPTIONS request (is_success) or the PROPFIND
+             request (res) failed. */
+          SoupMessage *target = !is_success ? msg_opts : msg_stat;
+          int error_code = http_error_code_from_status (target->status_code);
+
+          /* TODO: set correct error in case of cancellation */
+
+          g_vfs_job_failed (G_VFS_JOB (job),
+                            G_IO_ERROR, error_code,
+                            _("HTTP Error: %s"), target->reason_phrase);
+        }
       else
-        g_vfs_job_failed (G_VFS_JOB (job),
-                          G_IO_ERROR, G_IO_ERROR_FAILED,
-                          _("Not a WebDAV enabled share"));
+        {
+          /* This means, we have a valid DAV header, PROPFIND worked,
+             but it is not a collection!  */
+          g_vfs_job_failed (G_VFS_JOB (job),
+                            G_IO_ERROR, G_IO_ERROR_FAILED,
+                            _("Not a WebDAV enabled share"));
+          /* TODO: STRING CHANGE: change to: Could not find an enclosing directory */
+        }
 
       /* TODO: We leak a bunch of stuff here :-( */
-      /* TODO: STRING CHANGE: change to: Could not find an enclosing directory */
       return;
     }