merge with master

doc/webdav.md

 - Go to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters\BasicAuthLevel".
 - set "BasicAuthLevel" to "2".
 
+### Fix Windows Big file >50Mb file download.
+
+To avoid security problems, Windows doesn't allow to download >50Mb file
+by default from WebDAV share.
+
+To change file size limit of Windows :
+- Launch regedit.
+- Go to "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters".
+- set "FileSizeLimitInBytes" as DWORD decimal to the number of bytes needed,
+for example. 1Go is 1073741824, 500Mo is 524288000.
+
+see here for more info:
+https://support.microsoft.com/en-us/help/900900/folder-copy-error-message-when-downloading-a-file-that-is-larger-than
+
+### Fix Windows 30 Minutes timeout with big file.
+
+Windows add also a 30 minutes timeout for big file. If you want download who take
+more time, set the default timeout value.
+
+To set the default timeout value:
+- Launch regedit.
+- Go to "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MRxDAV\Parameters"
+- set "FsCtlRequestTimeoutInSec" DWORD decimal to more than 1800 second (30Min).
+for example : 3600 : 1H , 14400 : 4H , 86400 : A day (24H).
+
+see here more info:
+https://support.microsoft.com/fr-fr/help/2668751/you-cannot-download-more-than-50-mb-or-upload-large-files-when-the-upl
+
+
 ## OSX
 
 Webdav OSX addresses are similar to:
 - Your login/password will be ask. Use your Tracim credentials.
 - After that, your webdav access should be mounted.
 
+
 ## Linux
 
 Webdav Linux addresses are similar to:

tracim/tracim/lib/webdav/sql_resources.py

 
         self._file_count = 0
 
+        # FIXME : Remove this regex when tracim become
+        # able to deal with file at root of workspace
+        self._subfolder_regex = re.compile('^{}[^/]*$'.format(environ['http_authenticator.realm']))  # nopep8
+
     def __repr__(self) -> str:
         return "<DAVCollection: Workspace (%d)>" % self.workspace.workspace_id
 
         if resource:
             content = resource.content
 
+        # FIXME : Remove this regex when tracim become
+        # able to deal with file at root of workspace
+        if self._subfolder_regex.match(dirname(path)):
+            raise DAVError(HTTP_FORBIDDEN)
+
         if not content:
             # INFO - G.M - 21-03-2018 create new empty file and commit it.
             new_empty_file = FakeFileStream(
             invalid_path = invalid_path or any(x in self.path for x in ['.deleted', '.archived'])
             invalid_path = invalid_path or dirname(destpath) == self.environ['http_authenticator.realm']
 
+
             if not invalid_path:
                 self.move_folder(destpath)
 
         self.content = content
         self.user = UserApi(None).get_one_by_email(environ['http_authenticator.username'])
         self.content_api = ContentApi(self.user)
+        # FIXME : Remove this regex when tracim become
+        # able to deal with file at root of workspace
+        self._subfolder_regex = re.compile('^{}[^/]*$'.format(environ['http_authenticator.realm']))  # nopep8
 
         # this is the property that windows client except to check if the file is read-write or read-only,
         # but i wasn't able to set this property so you'll have to look into it >.>
             invalid_path = any(x in destpath for x in ['.deleted', '.archived'])
             invalid_path = invalid_path or any(x in self.path for x in ['.deleted', '.archived'])
             invalid_path = invalid_path or dirname(destpath) == self.environ['http_authenticator.realm']
+            # FIXME : Remove this regex when tracim become
+            # able to deal with file at root of workspace
+            invalid_path = invalid_path or self._subfolder_regex.match(dirname(destpath))
 
             if not invalid_path:
                 self.move_file(destpath)