1# Licensed to the Software Freedom Conservancy (SFC) under one
2# or more contributor license agreements.  See the NOTICE file
3# distributed with this work for additional information
4# regarding copyright ownership.  The SFC licenses this file
5# to you under the Apache License, Version 2.0 (the
6# "License"); you may not use this file except in compliance
7# with the License.  You may obtain a copy of the License at
8#
9#   http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing,
12# software distributed under the License is distributed on an
13# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14# KIND, either express or implied.  See the License for the
15# specific language governing permissions and limitations
16# under the License.
17
18import abc
19import os
20from selenium.webdriver.common.utils import keys_to_typing
21
22
23class FileDetector(object):
24    """
25    Used for identifying whether a sequence of chars represents the path to a
26    file.
27    """
28    __metaclass__ = abc.ABCMeta
29
30    @abc.abstractmethod
31    def is_local_file(self, *keys):
32        return
33
34
35class UselessFileDetector(FileDetector):
36    """
37    A file detector that never finds anything.
38    """
39    def is_local_file(self, *keys):
40        return None
41
42
43class LocalFileDetector(FileDetector):
44    """
45    Detects files on the local disk.
46    """
47    def is_local_file(self, *keys):
48        file_path = ''.join(keys_to_typing(keys))
49
50        if not file_path:
51            return None
52
53        try:
54            if os.path.isfile(file_path):
55                return file_path
56        except Exception:
57            pass
58        return None
59