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##############################################################################
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#
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# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
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# All Rights Reserved.
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#
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# This software is subject to the provisions of the Zope Public License,
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# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
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# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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# FOR A PARTICULAR PURPOSE.
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#
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##############################################################################
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"""Data Chunk Receiver
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"""
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from waitress.rfc7230 import CHUNK_EXT_RE, ONLY_HEXDIG_RE
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from waitress.utilities import BadRequest, find_double_newline
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class FixedStreamReceiver:
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# See IStreamConsumer
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completed = False
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error = None
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def __init__(self, cl, buf):
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self.remain = cl
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self.buf = buf
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def __len__(self):
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return self.buf.__len__()
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def received(self, data):
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"See IStreamConsumer"
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rm = self.remain
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if rm < 1:
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self.completed = True # Avoid any chance of spinning
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return 0
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datalen = len(data)
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if rm <= datalen:
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self.buf.append(data[:rm])
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self.remain = 0
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self.completed = True
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return rm
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else:
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self.buf.append(data)
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self.remain -= datalen
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return datalen
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def getfile(self):
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return self.buf.getfile()
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def getbuf(self):
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return self.buf
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class ChunkedReceiver:
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chunk_remainder = 0
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validate_chunk_end = False
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control_line = b""
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chunk_end = b""
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all_chunks_received = False
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trailer = b""
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completed = False
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error = None
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# max_control_line = 1024
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# max_trailer = 65536
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def __init__(self, buf):
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self.buf = buf
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def __len__(self):
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return self.buf.__len__()
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def received(self, s):
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# Returns the number of bytes consumed.
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if self.completed:
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return 0
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orig_size = len(s)
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while s:
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rm = self.chunk_remainder
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if rm > 0:
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# Receive the remainder of a chunk.
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to_write = s[:rm]
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self.buf.append(to_write)
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written = len(to_write)
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s = s[written:]
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self.chunk_remainder -= written
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if self.chunk_remainder == 0:
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self.validate_chunk_end = True
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elif self.validate_chunk_end:
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s = self.chunk_end + s
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pos = s.find(b"\r\n")
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if pos < 0 and len(s) < 2:
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self.chunk_end = s
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s = b""
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else:
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self.chunk_end = b""
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if pos == 0:
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# Chop off the terminating CR LF from the chunk
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s = s[2:]
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else:
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self.error = BadRequest("Chunk not properly terminated")
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self.all_chunks_received = True
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# Always exit this loop
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self.validate_chunk_end = False
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elif not self.all_chunks_received:
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# Receive a control line.
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s = self.control_line + s
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pos = s.find(b"\r\n")
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if pos < 0:
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# Control line not finished.
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self.control_line = s
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s = b""
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else:
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# Control line finished.
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line = s[:pos]
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s = s[pos + 2 :]
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self.control_line = b""
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if line:
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# Begin a new chunk.
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semi = line.find(b";")
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if semi >= 0:
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extinfo = line[semi:]
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valid_ext_info = CHUNK_EXT_RE.match(extinfo)
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if not valid_ext_info:
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self.error = BadRequest("Invalid chunk extension")
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self.all_chunks_received = True
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break
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line = line[:semi]
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if not ONLY_HEXDIG_RE.match(line):
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self.error = BadRequest("Invalid chunk size")
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self.all_chunks_received = True
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break
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# Can not fail due to matching against the regular
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# expression above
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sz = int(line, 16) # hexadecimal
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if sz > 0:
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# Start a new chunk.
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self.chunk_remainder = sz
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else:
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# Finished chunks.
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self.all_chunks_received = True
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# else expect a control line.
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else:
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# Receive the trailer.
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trailer = self.trailer + s
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if trailer.startswith(b"\r\n"):
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# No trailer.
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self.completed = True
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return orig_size - (len(trailer) - 2)
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pos = find_double_newline(trailer)
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if pos < 0:
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# Trailer not finished.
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self.trailer = trailer
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s = b""
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else:
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# Finished the trailer.
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self.completed = True
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self.trailer = trailer[:pos]
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return orig_size - (len(trailer) - pos)
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return orig_size
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def getfile(self):
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return self.buf.getfile()
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def getbuf(self):
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return self.buf
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