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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 logging
import os
import re
import sys
from gunicorn.http.message import HEADER_RE
from gunicorn.http.errors import InvalidHeader, InvalidHeaderName
from gunicorn import SERVER_SOFTWARE
import gunicorn.util as util
# Send files in at most 1GB blocks as some operating systems can have problems
# with sending files in blocks over 2GB.
BLKSIZE = 0x3FFFFFFF
HEADER_VALUE_RE = re.compile(r'[\x00-\x1F\x7F]')
log = logging.getLogger(__name__)
class FileWrapper(object):
def __init__(self, filelike, blksize=8192):
self.filelike = filelike
self.blksize = blksize
if hasattr(filelike, 'close'):
self.close = filelike.close
def __getitem__(self, key):
data = self.filelike.read(self.blksize)
if data:
return data
raise IndexError
class WSGIErrorsWrapper(io.RawIOBase):
def __init__(self, cfg):
# There is no public __init__ method for RawIOBase so
# we don't need to call super() in the __init__ method.
# pylint: disable=super-init-not-called
errorlog = logging.getLogger("gunicorn.error")
handlers = errorlog.handlers
self.streams = []
if cfg.errorlog == "-":
self.streams.append(sys.stderr)
handlers = handlers[1:]
for h in handlers:
if hasattr(h, "stream"):
self.streams.append(h.stream)
def write(self, data):
for stream in self.streams:
try:
stream.write(data)
except UnicodeError:
stream.write(data.encode("UTF-8"))
stream.flush()
def base_environ(cfg):
return {
"wsgi.errors": WSGIErrorsWrapper(cfg),
"wsgi.version": (1, 0),
"wsgi.multithread": False,
"wsgi.multiprocess": (cfg.workers > 1),
"wsgi.run_once": False,
"wsgi.file_wrapper": FileWrapper,
"SERVER_SOFTWARE": SERVER_SOFTWARE,
}
def default_environ(req, sock, cfg):
env = base_environ(cfg)
env.update({
"wsgi.input": req.body,
"gunicorn.socket": sock,
"REQUEST_METHOD": req.method,
"QUERY_STRING": req.query,
"RAW_URI": req.uri,
"SERVER_PROTOCOL": "HTTP/%s" % ".".join([str(v) for v in req.version])
})
return env
def proxy_environ(req):
info = req.proxy_protocol_info
if not info:
return {}
return {
"PROXY_PROTOCOL": info["proxy_protocol"],
"REMOTE_ADDR": info["client_addr"],
"REMOTE_PORT": str(info["client_port"]),
"PROXY_ADDR": info["proxy_addr"],
"PROXY_PORT": str(info["proxy_port"]),
}
def create(req, sock, client, server, cfg):
resp = Response(req, sock, cfg)
# set initial environ
environ = default_environ(req, sock, cfg)
# default variables
host = None
script_name = os.environ.get("SCRIPT_NAME", "")
# add the headers to the environ
for hdr_name, hdr_value in req.headers:
if hdr_name == "EXPECT":
# handle expect
if hdr_value.lower() == "100-continue":
sock.send(b"HTTP/1.1 100 Continue\r\n\r\n")
elif hdr_name == 'HOST':
host = hdr_value
elif hdr_name == "SCRIPT_NAME":
script_name = hdr_value
elif hdr_name == "CONTENT-TYPE":
environ['CONTENT_TYPE'] = hdr_value
continue
elif hdr_name == "CONTENT-LENGTH":
environ['CONTENT_LENGTH'] = hdr_value
continue
key = 'HTTP_' + hdr_name.replace('-', '_')
if key in environ:
hdr_value = "%s,%s" % (environ[key], hdr_value)
environ[key] = hdr_value
# set the url scheme
environ['wsgi.url_scheme'] = req.scheme
# set the REMOTE_* keys in environ
# authors should be aware that REMOTE_HOST and REMOTE_ADDR
# may not qualify the remote addr:
# http://www.ietf.org/rfc/rfc3875
if isinstance(client, str):
environ['REMOTE_ADDR'] = client
elif isinstance(client, bytes):
environ['REMOTE_ADDR'] = client.decode()
else:
environ['REMOTE_ADDR'] = client[0]
environ['REMOTE_PORT'] = str(client[1])
# handle the SERVER_*
# Normally only the application should use the Host header but since the
# WSGI spec doesn't support unix sockets, we are using it to create
# viable SERVER_* if possible.
if isinstance(server, str):
server = server.split(":")
if len(server) == 1:
# unix socket
if host:
server = host.split(':')
if len(server) == 1:
if req.scheme == "http":
server.append(80)
elif req.scheme == "https":
server.append(443)
else:
server.append('')
else:
# no host header given which means that we are not behind a
# proxy, so append an empty port.
server.append('')
environ['SERVER_NAME'] = server[0]
environ['SERVER_PORT'] = str(server[1])
# set the path and script name
path_info = req.path
if script_name:
path_info = path_info.split(script_name, 1)[1]
environ['PATH_INFO'] = util.unquote_to_wsgi_str(path_info)
environ['SCRIPT_NAME'] = script_name
# override the environ with the correct remote and server address if
# we are behind a proxy using the proxy protocol.
environ.update(proxy_environ(req))
return resp, environ
class Response(object):
def __init__(self, req, sock, cfg):
self.req = req
self.sock = sock
self.version = SERVER_SOFTWARE
self.status = None
self.chunked = False
self.must_close = False
self.headers = []
self.headers_sent = False
self.response_length = None
self.sent = 0
self.upgrade = False
self.cfg = cfg
def force_close(self):
self.must_close = True
def should_close(self):
if self.must_close or self.req.should_close():
return True
if self.response_length is not None or self.chunked:
return False
if self.req.method == 'HEAD':
return False
if self.status_code < 200 or self.status_code in (204, 304):
return False
return True
def start_response(self, status, headers, exc_info=None):
if exc_info:
try:
if self.status and self.headers_sent:
util.reraise(exc_info[0], exc_info[1], exc_info[2])
finally:
exc_info = None
elif self.status is not None:
raise AssertionError("Response headers already set!")
self.status = status
# get the status code from the response here so we can use it to check
# the need for the connection header later without parsing the string
# each time.
try:
self.status_code = int(self.status.split()[0])
except ValueError:
self.status_code = None
self.process_headers(headers)
self.chunked = self.is_chunked()
return self.write
def process_headers(self, headers):
for name, value in headers:
if not isinstance(name, str):
raise TypeError('%r is not a string' % name)
if HEADER_RE.search(name):
raise InvalidHeaderName('%r' % name)
if HEADER_VALUE_RE.search(value):
raise InvalidHeader('%r' % value)
value = str(value).strip()
lname = name.lower().strip()
if lname == "content-length":
self.response_length = int(value)
elif util.is_hoppish(name):
if lname == "connection":
# handle websocket
if value.lower().strip() == "upgrade":
self.upgrade = True
elif lname == "upgrade":
if value.lower().strip() == "websocket":
self.headers.append((name.strip(), value))
# ignore hopbyhop headers
continue
self.headers.append((name.strip(), value))
def is_chunked(self):
# Only use chunked responses when the client is
# speaking HTTP/1.1 or newer and there was
# no Content-Length header set.
if self.response_length is not None:
return False
elif self.req.version <= (1, 0):
return False
elif self.req.method == 'HEAD':
# Responses to a HEAD request MUST NOT contain a response body.
return False
elif self.status_code in (204, 304):
# Do not use chunked responses when the response is guaranteed to
# not have a response body.
return False
return True
def default_headers(self):
# set the connection header
if self.upgrade:
connection = "upgrade"
elif self.should_close():
connection = "close"
else:
connection = "keep-alive"
headers = [
"HTTP/%s.%s %s\r\n" % (self.req.version[0],
self.req.version[1], self.status),
"Server: %s\r\n" % self.version,
"Date: %s\r\n" % util.http_date(),
"Connection: %s\r\n" % connection
]
if self.chunked:
headers.append("Transfer-Encoding: chunked\r\n")
return headers
def send_headers(self):
if self.headers_sent:
return
tosend = self.default_headers()
tosend.extend(["%s: %s\r\n" % (k, v) for k, v in self.headers])
header_str = "%s\r\n" % "".join(tosend)
util.write(self.sock, util.to_bytestring(header_str, "ascii"))
self.headers_sent = True
def write(self, arg):
self.send_headers()
if not isinstance(arg, bytes):
raise TypeError('%r is not a byte' % arg)
arglen = len(arg)
tosend = arglen
if self.response_length is not None:
if self.sent >= self.response_length:
# Never write more than self.response_length bytes
return
tosend = min(self.response_length - self.sent, tosend)
if tosend < arglen:
arg = arg[:tosend]
# Sending an empty chunk signals the end of the
# response and prematurely closes the response
if self.chunked and tosend == 0:
return
self.sent += tosend
util.write(self.sock, arg, self.chunked)
def can_sendfile(self):
return self.cfg.sendfile is not False
def sendfile(self, respiter):
if self.cfg.is_ssl or not self.can_sendfile():
return False
if not util.has_fileno(respiter.filelike):
return False
fileno = respiter.filelike.fileno()
try:
offset = os.lseek(fileno, 0, os.SEEK_CUR)
if self.response_length is None:
filesize = os.fstat(fileno).st_size
# The file may be special and sendfile will fail.
# It may also be zero-length, but that is okay.
if filesize == 0:
return False
nbytes = filesize - offset
else:
nbytes = self.response_length
except (OSError, io.UnsupportedOperation):
return False
self.send_headers()
if self.is_chunked():
chunk_size = "%X\r\n" % nbytes
self.sock.sendall(chunk_size.encode('utf-8'))
sockno = self.sock.fileno()
sent = 0
while sent != nbytes:
count = min(nbytes - sent, BLKSIZE)
sent += os.sendfile(sockno, fileno, offset + sent, count)
if self.is_chunked():
self.sock.sendall(b"\r\n")
os.lseek(fileno, offset, os.SEEK_SET)
return True
def write_file(self, respiter):
if not self.sendfile(respiter):
for item in respiter:
self.write(item)
def close(self):
if not self.headers_sent:
self.send_headers()
if self.chunked:
util.write_chunk(self.sock, b"")