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http_response.py
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http_response.py
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# Copyright (c) 2023 nggit
import os
import time
from datetime import datetime, timedelta, timezone
from urllib.parse import quote
from .http_exception import (
BadRequest, ExpectationFailed, InternalServerError, RangeNotSatisfiable
)
from .response import Response
KEEPALIVE_OR_CLOSE = {
True: b'keep-alive',
False: b'close'
}
KEEPALIVE_OR_UPGRADE = {
False: b'keep-alive',
True: b'upgrade'
}
class HTTPResponse(Response):
__slots__ = ('_headers',
'http_chunked',
'_request',
'_status',
'_content_type')
def __init__(self, request):
super().__init__(request)
self._headers = {}
self.http_chunked = False
self._request = request
self._status = []
self._content_type = []
@property
def headers(self):
if self._headers is None:
raise InternalServerError('headers already sent')
return self._headers
def headers_sent(self, sent=False):
if sent:
self._headers = None
return self._headers is None
def append_header(self, name, value):
if isinstance(name, str):
name = name.encode('latin-1')
if isinstance(value, str):
value = value.encode('latin-1')
_name = name.lower()
if _name in self.headers:
self.headers[_name].append(name + b': ' + value)
else:
self.headers[_name] = [name + b': ' + value]
def set_base_header(self):
if self.headers_sent() or self.headers:
return
self.set_header(
b'Date',
self._request.protocol.options['server_info']['date']
)
self.set_header(
b'Server',
self._request.protocol.options['server_info']['name']
)
def set_cookie(
self,
name,
value='',
expires=0,
path='/',
domain=None,
secure=False,
httponly=False,
samesite=None
):
if isinstance(name, str):
name = name.encode('latin-1')
value = quote(value).encode('latin-1')
date_expired = (
(datetime.now(timezone.utc) + timedelta(seconds=expires))
.strftime('%a, %d %b %Y %H:%M:%S GMT')
.encode('latin-1')
)
path = quote(path).encode('latin-1')
cookie = bytearray(
b'%s=%s; expires=%s; max-age=%d; path=%s' % (
name, value, date_expired, expires, path)
)
for k, v in ((b'domain', domain), (b'samesite', samesite)):
if v:
cookie.extend(b'; %s=%s' % (k, bytes(quote(v), 'latin-1')))
for k, v in ((secure, b'; secure'), (httponly, b'; httponly')):
if k:
cookie.extend(v)
if b'\n' in cookie:
raise InternalServerError
self.append_header(b'Set-Cookie', cookie)
def set_header(self, name, value=''):
if isinstance(name, str):
name = name.encode('latin-1')
if isinstance(value, str):
value = value.encode('latin-1')
if b'\n' in name or b'\n' in value:
raise InternalServerError
self.headers[name.lower()] = [name + b': ' + value]
def set_status(self, status=200, message=b'OK'):
if isinstance(message, str):
message = message.encode('latin-1')
if not isinstance(status, int) or b'\n' in message:
raise InternalServerError
if b'_line' in self.headers:
self.headers[b'_line'][1] = b'%d' % status
self.headers[b'_line'][2] = message
else:
self._status.append((status, message))
def get_status(self):
if b'_line' in self.headers:
_, status, message = self.headers.pop(b'_line')
return int(status), message
try:
return self._status.pop()
except IndexError:
return 200, b'OK'
def set_content_type(self, content_type=b'text/html; charset=utf-8'):
if isinstance(content_type, str):
content_type = content_type.encode('latin-1')
if b'\n' in content_type:
raise InternalServerError
if b'content-type' in self.headers:
self.headers[b'content-type'] = [b'Content-Type: ' + content_type]
else:
self._content_type.append(content_type)
def get_content_type(self):
if b'content-type' in self.headers:
return self.headers.pop(b'content-type')[0][13:].lstrip()
try:
return self._content_type.pop()
except IndexError:
return b'text/html; charset=utf-8'
def close(self, keepalive=False):
if not keepalive:
# this will force the TCP connection to be terminated
self._request.http_keepalive = False
super().close()
async def send_continue(self):
if self._request.http_continue:
if (self._request.content_length >
self._request.protocol.options['client_max_body_size']):
raise ExpectationFailed
await self.send(
b'HTTP/%s 100 Continue\r\n\r\n' % self._request.version,
throttle=False
)
self.close(keepalive=True)
async def end(self, data=b'', keepalive=True, **kwargs):
if self.headers_sent():
await self.write(data, throttle=False)
else:
self.set_base_header()
status = self.get_status()
content_length = len(data)
if content_length > 0 and (
self._request.method == b'HEAD' or
status[0] in (204, 205, 304) or 100 <= status[0] < 200
):
data = b''
excludes = (b'connection', b'content-length', b'transfer-encoding')
await self.send(
b'HTTP/%s %d %s\r\nContent-Type: %s\r\nContent-Length: %d\r\n'
b'Connection: %s\r\n%s\r\n\r\n%s' % (
self._request.version,
*status,
self.get_content_type(),
content_length,
KEEPALIVE_OR_CLOSE[
keepalive and self._request.http_keepalive],
b'\r\n'.join(
b'\r\n'.join(v) for k, v in self.headers.items() if
k not in excludes),
data), throttle=False, **kwargs
)
self.headers_sent(True)
self.close(keepalive=keepalive)
async def write(self, data, chunked=None, buffer_size=16 * 1024, **kwargs):
kwargs['buffer_size'] = buffer_size
if not self.headers_sent():
if b'_line' not in self.headers:
# this block is executed when write() is called outside the
# handler/middleware. e.g. ASGI server
self.set_base_header()
status = self.get_status()
no_content = (status[0] in (204, 205, 304) or
100 <= status[0] < 200)
if chunked is None:
self.http_chunked = (self._request.version == b'1.1' and
not no_content)
else:
self.http_chunked = chunked
self.headers[b'_line'] = [b'HTTP/%s' % self._request.version,
b'%d' % status[0],
status[1]]
if not no_content:
self.set_header(b'Content-Type', self.get_content_type())
if self.http_chunked:
self.set_header(b'Transfer-Encoding', b'chunked')
if self._request.http_keepalive:
if status[0] == 101:
self._request.upgraded = True
elif not (self.http_chunked or
b'content-length' in self.headers):
# no chunk, no close, no size.
# Assume close to signal end
self._request.http_keepalive = False
self.set_header(
b'Connection',
KEEPALIVE_OR_UPGRADE[status[0] in (101, 426)]
)
else:
self.set_header(b'Connection', b'close')
if self._request.method == b'HEAD' or no_content:
if status[0] not in (101, 426):
self._request.http_keepalive = False
data = None
else:
self._request.protocol.set_watermarks(
high=buffer_size * 4,
low=kwargs.get('buffer_min_size', buffer_size // 2)
)
await self.send(
b' '.join(self.headers.pop(b'_line')) + b'\r\n' +
b'\r\n'.join(b'\r\n'.join(v) for v in self.headers.values()) +
b'\r\n\r\n', throttle=False
)
self.headers_sent(True)
if (self.http_chunked and not self._request.upgraded and
data is not None):
await self.send(b'%X\r\n%s\r\n' % (len(data), data), **kwargs)
else:
await self.send(data, **kwargs)
async def sendfile(
self,
path,
file_size=None,
buffer_size=16 * 1024,
content_type=b'application/octet-stream',
**kwargs):
kwargs['buffer_size'] = buffer_size
try:
handle = self._request.context.RESPONSE_SENDFILE_HANDLE
except AttributeError:
handle = open(path, 'rb')
self._request.context.RESPONSE_SENDFILE_HANDLE = handle
self._request.context.tasks.append(
self._request.context.RESPONSE_SENDFILE_HANDLE.close
)
st = os.stat(path)
if not file_size:
file_size = st.st_size
mdate = time.strftime('%a, %d %b %Y %H:%M:%S GMT',
time.gmtime(st.st_mtime)).encode('latin-1')
if (self._request.version == b'1.1' and
b'range' in self._request.headers):
if (b'if-range' in self._request.headers and
self._request.headers[b'if-range'] != mdate):
self.set_content_type(content_type)
self.set_header(b'Last-Modified', mdate)
self.set_header(b'Content-Length', b'%d' % file_size)
self.set_header(b'Accept-Ranges', b'bytes')
data = True
while data:
data = handle.read(buffer_size)
await self.write(data, chunked=False, **kwargs)
self.close(keepalive=True)
return
_range = self._request.headers[b'range']
if isinstance(_range, list):
for v in _range:
if not v.startswith(b'bytes='):
raise BadRequest('bad range')
_range = b','.join(_range)
else:
if not _range.startswith(b'bytes='):
raise BadRequest('bad range')
ranges = []
try:
for v in _range.replace(b'bytes=', b'').split(b',', 100):
v = v.strip()
if v.startswith(b'-'):
start = file_size + int(v)
if start < 0:
raise RangeNotSatisfiable
ranges.append(
(start, file_size - 1, file_size - start)
)
elif v.endswith(b'-'):
start = int(v[:-1])
if start >= file_size:
raise RangeNotSatisfiable
ranges.append(
(start, file_size - 1, file_size - start)
)
else:
start, end = v.split(b'-', 1)
start = int(start)
end = int(end)
if end == 0:
end = start
if start > end or end >= file_size:
raise RangeNotSatisfiable
ranges.append((start, end, end - start + 1))
except ValueError as exc:
raise BadRequest('bad range') from exc
self.set_status(206, b'Partial Content')
if len(ranges) == 1:
start, end, size = ranges[0]
self.set_content_type(content_type)
self.set_header(b'Content-Length', b'%d' % size)
self.set_header(
b'Content-Range', b'bytes %d-%d/%d' % (
start, end, file_size)
)
handle.seek(start)
while size > 0:
await self.write(handle.read(min(size, buffer_size)),
chunked=False, **kwargs)
size -= buffer_size
else:
client = self._request.client
if client is None:
fileno = self._request.socket.fileno()
client = (str(fileno), fileno)
ip, port = client
boundary = b'----Boundary%x%x%x%x' % (hash(ip),
port,
os.getpid(),
int.from_bytes(
os.urandom(4),
byteorder='big'))
self.set_content_type(
b'multipart/byteranges; boundary=%s' % boundary
)
for start, end, size in ranges:
await self.write(
b'--%s\r\nContent-Type: %s\r\n'
b'Content-Range: bytes %d-%d/%d\r\n\r\n' % (
boundary, content_type, start, end, file_size),
**kwargs
)
handle.seek(start)
while size > 0:
await self.write(
handle.read(min(size, buffer_size)), **kwargs
)
size -= buffer_size
await self.write(b'\r\n', **kwargs)
await self.write(b'--%s--\r\n' % boundary, **kwargs)
await self.write(b'', **kwargs)
else:
if (b'if-modified-since' in self._request.headers and
self._request.headers[b'if-modified-since'] == mdate):
self.set_status(304, b'Not Modified')
await self.write(None)
return
self.set_content_type(content_type)
self.set_header(b'Last-Modified', mdate)
self.set_header(b'Content-Length', b'%d' % file_size)
if self._request.version == b'1.1':
self.set_header(b'Accept-Ranges', b'bytes')
data = True
while data:
data = handle.read(buffer_size)
await self.write(data, chunked=False, **kwargs)
self.close(keepalive=True)