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# -*- coding: utf-8 -
#
# This file is part of gunicorn released under the MIT license.
# See the NOTICE for more information.
import io
import sys
from gunicorn.http.errors import (NoMoreData, ChunkMissingTerminator,
InvalidChunkSize)
class ChunkedReader(object):
def __init__(self, req, unreader):
self.req = req
self.parser = self.parse_chunked(unreader)
self.buf = io.BytesIO()
def read(self, size):
if not isinstance(size, int):
raise TypeError("size must be an integer type")
if size < 0:
raise ValueError("Size must be positive.")
if size == 0:
return b""
if self.parser:
while self.buf.tell() < size:
try:
self.buf.write(next(self.parser))
except StopIteration:
self.parser = None
break
data = self.buf.getvalue()
ret, rest = data[:size], data[size:]
self.buf = io.BytesIO()
self.buf.write(rest)
return ret
def parse_trailers(self, unreader, data):
buf = io.BytesIO()
buf.write(data)
idx = buf.getvalue().find(b"\r\n\r\n")
done = buf.getvalue()[:2] == b"\r\n"
while idx < 0 and not done:
self.get_data(unreader, buf)
idx = buf.getvalue().find(b"\r\n\r\n")
done = buf.getvalue()[:2] == b"\r\n"
if done:
unreader.unread(buf.getvalue()[2:])
return b""
self.req.trailers = self.req.parse_headers(buf.getvalue()[:idx])
unreader.unread(buf.getvalue()[idx + 4:])
def parse_chunked(self, unreader):
(size, rest) = self.parse_chunk_size(unreader)
while size > 0:
while size > len(rest):
size -= len(rest)
yield rest
rest = unreader.read()
if not rest:
raise NoMoreData()
yield rest[:size]
# Remove \r\n after chunk
rest = rest[size:]
while len(rest) < 2:
rest += unreader.read()
if rest[:2] != b'\r\n':
raise ChunkMissingTerminator(rest[:2])
(size, rest) = self.parse_chunk_size(unreader, data=rest[2:])
def parse_chunk_size(self, unreader, data=None):
buf = io.BytesIO()
if data is not None:
buf.write(data)
idx = buf.getvalue().find(b"\r\n")
while idx < 0:
self.get_data(unreader, buf)
idx = buf.getvalue().find(b"\r\n")
data = buf.getvalue()
line, rest_chunk = data[:idx], data[idx + 2:]
chunk_size = line.split(b";", 1)[0].strip()
try:
chunk_size = int(chunk_size, 16)
except ValueError:
raise InvalidChunkSize(chunk_size)
if chunk_size == 0:
try:
self.parse_trailers(unreader, rest_chunk)
except NoMoreData:
pass
return (0, None)
return (chunk_size, rest_chunk)
def get_data(self, unreader, buf):
data = unreader.read()
if not data:
raise NoMoreData()
buf.write(data)
class LengthReader(object):
def __init__(self, unreader, length):
self.unreader = unreader
self.length = length
def read(self, size):
if not isinstance(size, int):
raise TypeError("size must be an integral type")
size = min(self.length, size)
if size < 0:
raise ValueError("Size must be positive.")
if size == 0:
return b""
buf = io.BytesIO()
data = self.unreader.read()
while data:
buf.write(data)
if buf.tell() >= size:
break
data = self.unreader.read()
buf = buf.getvalue()
ret, rest = buf[:size], buf[size:]
self.unreader.unread(rest)
self.length -= size
return ret
class EOFReader(object):
def __init__(self, unreader):
self.unreader = unreader
self.buf = io.BytesIO()
self.finished = False
def read(self, size):
if not isinstance(size, int):
raise TypeError("size must be an integral type")
if size < 0:
raise ValueError("Size must be positive.")
if size == 0:
return b""
if self.finished:
data = self.buf.getvalue()
ret, rest = data[:size], data[size:]
self.buf = io.BytesIO()
self.buf.write(rest)
return ret
data = self.unreader.read()
while data:
self.buf.write(data)
if self.buf.tell() > size:
break
data = self.unreader.read()
if not data:
self.finished = True
data = self.buf.getvalue()
ret, rest = data[:size], data[size:]
self.buf = io.BytesIO()
self.buf.write(rest)
return ret
class Body(object):
def __init__(self, reader):
self.reader = reader
self.buf = io.BytesIO()
def __iter__(self):
return self
def __next__(self):
ret = self.readline()
if not ret:
raise StopIteration()
return ret
next = __next__
def getsize(self, size):
if size is None:
return sys.maxsize
elif not isinstance(size, int):
raise TypeError("size must be an integral type")
elif size < 0:
return sys.maxsize
return size
def read(self, size=None):
size = self.getsize(size)
if size == 0:
return b""
if size < self.buf.tell():
data = self.buf.getvalue()
ret, rest = data[:size], data[size:]
self.buf = io.BytesIO()
self.buf.write(rest)
return ret
while size > self.buf.tell():
data = self.reader.read(1024)
if not data:
break
self.buf.write(data)
data = self.buf.getvalue()
ret, rest = data[:size], data[size:]
self.buf = io.BytesIO()
self.buf.write(rest)
return ret
def readline(self, size=None):
size = self.getsize(size)
if size == 0:
return b""
data = self.buf.getvalue()
self.buf = io.BytesIO()
ret = []
while 1:
idx = data.find(b"\n", 0, size)
idx = idx + 1 if idx >= 0 else size if len(data) >= size else 0
if idx:
ret.append(data[:idx])
self.buf.write(data[idx:])
break
ret.append(data)
size -= len(data)
data = self.reader.read(min(1024, size))
if not data:
break
return b"".join(ret)
def readlines(self, size=None):
ret = []
data = self.read()
while data:
pos = data.find(b"\n")
if pos < 0:
ret.append(data)
data = b""
else:
line, data = data[:pos + 1], data[pos + 1:]
ret.append(line)
return ret
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