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def _handle_one_request(self):
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SimpleHTTPServer.SimpleHTTPRequestHandler.handle_one_request(self)
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_range_regexp = re.compile(r'^(?P<start>\d+)-(?P<end>\d+)?$')
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_range_regexp = re.compile(r'^(?P<start>\d+)-(?P<end>\d+)$')
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_tail_regexp = re.compile(r'^-(?P<tail>\d+)$')
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def _parse_ranges(self, ranges_header, file_size):
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"""Parse the range header value and returns ranges.
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RFC2616 14.35 says that syntactically invalid range specifiers MUST be
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ignored. In that case, we return None instead of a range list.
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:param ranges_header: The 'Range' header value.
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:param file_size: The size of the requested file.
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:return: A list of (start, end) tuples or None if some invalid range
145
specifier is encountered.
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def parse_ranges(self, ranges_header):
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"""Parse the range header value and returns ranges and tail.
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RFC2616 14.35 says that syntactically invalid range
138
specifiers MUST be ignored. In that case, we return 0 for
139
tail and [] for ranges.
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143
if not ranges_header.startswith('bytes='):
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144
# Syntactically invalid header
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147
ranges_header = ranges_header[len('bytes='):]
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148
for range_str in ranges_header.split(','):
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# FIXME: RFC2616 says end is optional and default to file_size
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150
range_match = self._range_regexp.match(range_str)
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151
if range_match is not None:
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152
start = int(range_match.group('start'))
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end_match = range_match.group('end')
159
if end_match is None:
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# RFC2616 says end is optional and default to file_size
153
end = int(range_match.group('end'))
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155
# Syntactically invalid range
167
157
ranges.append((start, end))
169
159
tail_match = self._tail_regexp.match(range_str)
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161
tail = int(tail_match.group('tail'))
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163
# Syntactically invalid range
176
# Normalize tail into ranges
177
ranges.append((max(0, file_size - tail), file_size))
180
for start, end in ranges:
181
if start >= file_size:
182
# RFC2616 14.35, ranges are invalid if start >= file_size
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# RFC2616 14.35, end values should be truncated
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# to file_size -1 if they exceed it
186
end = min(end, file_size - 1)
187
checked_ranges.append((start, end))
188
return checked_ranges
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167
def _header_line_length(self, keyword, value):
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168
header_line = '%s: %s\r\n' % (keyword, value)
283
260
file_size = os.fstat(f.fileno())[6]
284
ranges = self._parse_ranges(ranges_header_value, file_size)
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tail, ranges = self.parse_ranges(ranges_header_value)
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# Normalize tail into ranges
264
ranges.append((file_size - tail, file_size))
266
self._satisfiable_ranges = True
268
self._satisfiable_ranges = False
270
def check_range(range_specifier):
271
start, end = range_specifier
272
# RFC2616 14.35, ranges are invalid if start >= file_size
273
if start >= file_size:
274
self._satisfiable_ranges = False # Side-effect !
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# RFC2616 14.35, end values should be truncated
277
# to file_size -1 if they exceed it
278
end = min(end, file_size - 1)
281
ranges = map(check_range, ranges)
283
if not self._satisfiable_ranges:
286
284
# RFC2616 14.16 and 14.35 says that when a server
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285
# encounters unsatisfiable range specifiers, it
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286
# SHOULD return a 416.