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[youtube-dl] / youtube_dl / downloader / external.py
1 from __future__ import unicode_literals
2
3 import os.path
4 import subprocess
5
6 from .common import FileDownloader
7 from ..utils import (
8     encodeFilename,
9     encodeArgument,
10 )
11
12
13 class ExternalFD(FileDownloader):
14     def real_download(self, filename, info_dict):
15         self.report_destination(filename)
16         tmpfilename = self.temp_name(filename)
17
18         retval = self._call_downloader(tmpfilename, info_dict)
19         if retval == 0:
20             fsize = os.path.getsize(encodeFilename(tmpfilename))
21             self.to_screen('\r[%s] Downloaded %s bytes' % (self.get_basename(), fsize))
22             self.try_rename(tmpfilename, filename)
23             self._hook_progress({
24                 'downloaded_bytes': fsize,
25                 'total_bytes': fsize,
26                 'filename': filename,
27                 'status': 'finished',
28             })
29             return True
30         else:
31             self.to_stderr('\n')
32             self.report_error('%s exited with code %d' % (
33                 self.get_basename(), retval))
34             return False
35
36     @classmethod
37     def get_basename(cls):
38         return cls.__name__[:-2].lower()
39
40     @property
41     def exe(self):
42         return self.params.get('external_downloader')
43
44     @classmethod
45     def supports(cls, info_dict):
46         return info_dict['protocol'] in ('http', 'https', 'ftp', 'ftps')
47
48     def _source_address(self, command_option):
49         source_address = self.params.get('source_address')
50         if source_address is None:
51             return []
52         return [command_option, source_address]
53
54     def _configuration_args(self, default=[]):
55         ex_args = self.params.get('external_downloader_args')
56         if ex_args is None:
57             return default
58         assert isinstance(ex_args, list)
59         return ex_args
60
61     def _call_downloader(self, tmpfilename, info_dict):
62         """ Either overwrite this or implement _make_cmd """
63         cmd = [encodeArgument(a) for a in self._make_cmd(tmpfilename, info_dict)]
64
65         self._debug_cmd(cmd)
66
67         p = subprocess.Popen(
68             cmd, stderr=subprocess.PIPE)
69         _, stderr = p.communicate()
70         if p.returncode != 0:
71             self.to_stderr(stderr)
72         return p.returncode
73
74
75 class CurlFD(ExternalFD):
76     def _make_cmd(self, tmpfilename, info_dict):
77         cmd = [self.exe, '--location', '-o', tmpfilename]
78         for key, val in info_dict['http_headers'].items():
79             cmd += ['--header', '%s: %s' % (key, val)]
80         cmd += self._source_address('--interface')
81         cmd += self._configuration_args()
82         cmd += ['--', info_dict['url']]
83         return cmd
84
85
86 class WgetFD(ExternalFD):
87     def _make_cmd(self, tmpfilename, info_dict):
88         cmd = [self.exe, '-O', tmpfilename, '-nv', '--no-cookies']
89         for key, val in info_dict['http_headers'].items():
90             cmd += ['--header', '%s: %s' % (key, val)]
91         cmd += self._source_address('--bind-address')
92         cmd += self._configuration_args()
93         cmd += ['--', info_dict['url']]
94         return cmd
95
96
97 class Aria2cFD(ExternalFD):
98     def _make_cmd(self, tmpfilename, info_dict):
99         cmd = [self.exe, '-c']
100         cmd += self._configuration_args([
101             '--min-split-size', '1M', '--max-connection-per-server', '4'])
102         dn = os.path.dirname(tmpfilename)
103         if dn:
104             cmd += ['--dir', dn]
105         cmd += ['--out', os.path.basename(tmpfilename)]
106         for key, val in info_dict['http_headers'].items():
107             cmd += ['--header', '%s: %s' % (key, val)]
108         cmd += self._source_address('--interface')
109         cmd += ['--', info_dict['url']]
110         return cmd
111
112
113 class HttpieFD(ExternalFD):
114     def _make_cmd(self, tmpfilename, info_dict):
115         cmd = ['http', '--download', '--output', tmpfilename, info_dict['url']]
116         for key, val in info_dict['http_headers'].items():
117             cmd += ['%s:%s' % (key, val)]
118         return cmd
119
120 _BY_NAME = dict(
121     (klass.get_basename(), klass)
122     for name, klass in globals().items()
123     if name.endswith('FD') and name != 'ExternalFD'
124 )
125
126
127 def list_external_downloaders():
128     return sorted(_BY_NAME.keys())
129
130
131 def get_external_downloader(external_downloader):
132     """ Given the name of the executable, see whether we support the given
133         downloader . """
134     bn = os.path.basename(external_downloader)
135     return _BY_NAME[bn]