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# Copyright (C) 2006-2010 Canonical Ltd
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# Copyright (C) 2006-2011 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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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):
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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
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specifiers MUST be ignored. In that case, we return 0 for
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tail and [] for ranges.
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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
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specifier is encountered.
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if not ranges_header.startswith('bytes='):
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# Syntactically invalid header
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ranges_header = ranges_header[len('bytes='):]
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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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range_match = self._range_regexp.match(range_str)
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if range_match is not None:
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start = int(range_match.group('start'))
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end = int(range_match.group('end'))
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end_match = range_match.group('end')
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if end_match is None:
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# RFC2616 says end is optional and default to file_size
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# Syntactically invalid range
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ranges.append((start, end))
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tail_match = self._tail_regexp.match(range_str)
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tail = int(tail_match.group('tail'))
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# Syntactically invalid range
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# Normalize tail into ranges
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ranges.append((max(0, file_size - tail), file_size))
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for start, end in ranges:
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if start >= file_size:
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# 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
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end = min(end, file_size - 1)
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checked_ranges.append((start, end))
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return checked_ranges
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def _header_line_length(self, keyword, value):
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header_line = '%s: %s\r\n' % (keyword, value)
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file_size = os.fstat(f.fileno())[6]
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tail, ranges = self.parse_ranges(ranges_header_value)
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# Normalize tail into ranges
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ranges.append((file_size - tail, file_size))
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self._satisfiable_ranges = True
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self._satisfiable_ranges = False
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def check_range(range_specifier):
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start, end = range_specifier
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# RFC2616 14.35, ranges are invalid if start >= file_size
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if start >= file_size:
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self._satisfiable_ranges = False # Side-effect !
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# RFC2616 14.35, end values should be truncated
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# to file_size -1 if they exceed it
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end = min(end, file_size - 1)
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ranges = map(check_range, ranges)
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if not self._satisfiable_ranges:
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ranges = self._parse_ranges(ranges_header_value, file_size)
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# RFC2616 14.16 and 14.35 says that when a server
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# encounters unsatisfiable range specifiers, it
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# SHOULD return a 416.