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
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
from __future__ import unicode_literals
import os
from io import BytesIO, StringIO, UnsupportedOperation
from django.core.files.utils import FileProxyMixin
from django.utils import six
from django.utils.encoding import (
force_bytes, force_str, python_2_unicode_compatible, smart_text,
)
@python_2_unicode_compatible
class File(FileProxyMixin):
DEFAULT_CHUNK_SIZE = 64 * 2 ** 10
def __init__(self, file, name=None):
self.file = file
if name is None:
name = getattr(file, 'name', None)
self.name = name
if hasattr(file, 'mode'):
self.mode = file.mode
def __str__(self):
return smart_text(self.name or '')
def __repr__(self):
return force_str("<%s: %s>" % (self.__class__.__name__, self or "None"))
def __bool__(self):
return bool(self.name)
def __nonzero__(self): # Python 2 compatibility
return type(self).__bool__(self)
def __len__(self):
return self.size
def _get_size_from_underlying_file(self):
if hasattr(self.file, 'size'):
return self.file.size
if hasattr(self.file, 'name'):
try:
return os.path.getsize(self.file.name)
except (OSError, TypeError):
pass
if hasattr(self.file, 'tell') and hasattr(self.file, 'seek'):
pos = self.file.tell()
self.file.seek(0, os.SEEK_END)
size = self.file.tell()
self.file.seek(pos)
return size
raise AttributeError("Unable to determine the file's size.")
def _get_size(self):
if hasattr(self, '_size'):
return self._size
self._size = self._get_size_from_underlying_file()
return self._size
def _set_size(self, size):
self._size = size
size = property(_get_size, _set_size)
def _get_closed(self):
return not self.file or self.file.closed
closed = property(_get_closed)
def chunks(self, chunk_size=None):
"""
Read the file and yield chunks of ``chunk_size`` bytes (defaults to
``UploadedFile.DEFAULT_CHUNK_SIZE``).
"""
if not chunk_size:
chunk_size = self.DEFAULT_CHUNK_SIZE
try:
self.seek(0)
except (AttributeError, UnsupportedOperation):
pass
while True:
data = self.read(chunk_size)
if not data:
break
yield data
def multiple_chunks(self, chunk_size=None):
"""
Returns ``True`` if you can expect multiple chunks.
NB: If a particular file representation is in memory, subclasses should
always return ``False`` -- there's no good reason to read from memory in
chunks.
"""
if not chunk_size:
chunk_size = self.DEFAULT_CHUNK_SIZE
return self.size > chunk_size
def __iter__(self):
# Iterate over this file-like object by newlines
buffer_ = None
for chunk in self.chunks():
for line in chunk.splitlines(True):
if buffer_:
if endswith_cr(buffer_) and not equals_lf(line):
# Line split after a \r newline; yield buffer_.
yield buffer_
# Continue with line.
else:
# Line either split without a newline (line
# continues after buffer_) or with \r\n
# newline (line == b'\n').
line = buffer_ + line
# buffer_ handled, clear it.
buffer_ = None
# If this is the end of a \n or \r\n line, yield.
if endswith_lf(line):
yield line
else:
buffer_ = line
if buffer_ is not None:
yield buffer_
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, tb):
self.close()
def open(self, mode=None):
if not self.closed:
self.seek(0)
elif self.name and os.path.exists(self.name):
self.file = open(self.name, mode or self.mode)
else:
raise ValueError("The file cannot be reopened.")
def close(self):
self.file.close()
@python_2_unicode_compatible
class ContentFile(File):
"""
A File-like object that takes just raw content, rather than an actual file.
"""
def __init__(self, content, name=None):
if six.PY3:
stream_class = StringIO if isinstance(content, six.text_type) else BytesIO
else:
stream_class = BytesIO
content = force_bytes(content)
super(ContentFile, self).__init__(stream_class(content), name=name)
self.size = len(content)
def __str__(self):
return 'Raw content'
def __bool__(self):
return True
def __nonzero__(self): # Python 2 compatibility
return type(self).__bool__(self)
def open(self, mode=None):
self.seek(0)
def close(self):
pass
def endswith_cr(line):
"""
Return True if line (a text or byte string) ends with '\r'.
"""
return line.endswith('\r' if isinstance(line, six.text_type) else b'\r')
def endswith_lf(line):
"""
Return True if line (a text or byte string) ends with '\n'.
"""
return line.endswith('\n' if isinstance(line, six.text_type) else b'\n')
def equals_lf(line):
"""
Return True if line (a text or byte string) equals '\n'.
"""
return line == ('\n' if isinstance(line, six.text_type) else b'\n')
|