gallery_dl/downloader/__init__.py


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

# -*- coding: utf-8 -*-

# Copyright 2015-2021 Mike Fährmann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.

"""Downloader modules"""

modules = [
    "http",
    "text",
    "ytdl",
]


def find(scheme):
    """Return downloader class suitable for handling the given scheme"""
    try:
        return _cache[scheme]
    except KeyError:
        pass

    cls = None
    if scheme == "https":
        scheme = "http"
    if scheme in modules:  # prevent unwanted imports
        try:
            module = __import__(scheme, globals(), None, None, 1)
        except ImportError:
            pass
        else:
            cls = module.__downloader__

    if scheme == "http":
        _cache["http"] = _cache["https"] = cls
    else:
        _cache[scheme] = cls
    return cls


# --------------------------------------------------------------------
# internals

_cache = {}