/usr/lib/python2.7/dist-packages/netlib/http.py is in python-netlib 0.9.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import odict, utils
class HttpError(Exception):
def __init__(self, code, msg):
self.code, self.msg = code, msg
def __str__(self):
return "HttpError(%s, %s)"%(self.code, self.msg)
class HttpErrorConnClosed(HttpError): pass
def _is_valid_port(port):
if not 0 <= port <= 65535:
return False
return True
def _is_valid_host(host):
try:
host.decode("idna")
except ValueError:
return False
if "\0" in host:
return None
return True
def parse_url(url):
"""
Returns a (scheme, host, port, path) tuple, or None on error.
Checks that:
port is an integer 0-65535
host is a valid IDNA-encoded hostname with no null-bytes
path is valid ASCII
"""
try:
scheme, netloc, path, params, query, fragment = urlparse.urlparse(url)
except ValueError:
return None
if not scheme:
return None
if ':' in netloc:
host, port = string.rsplit(netloc, ':', maxsplit=1)
try:
port = int(port)
except ValueError:
return None
else:
host = netloc
if scheme == "https":
port = 443
else:
port = 80
path = urlparse.urlunparse(('', '', path, params, query, fragment))
if not path.startswith("/"):
path = "/" + path
if not _is_valid_host(host):
return None
if not utils.isascii(path):
return None
if not _is_valid_port(port):
return None
return scheme, host, port, path
def read_headers(fp):
"""
Read a set of headers from a file pointer. Stop once a blank line is
reached. Return a ODictCaseless object, or None if headers are invalid.
"""
ret = []
name = ''
while 1:
line = fp.readline()
if not line or line == '\r\n' or line == '\n':
break
if line[0] in ' \t':
if not ret:
return None
# continued header
ret[-1][1] = ret[-1][1] + '\r\n ' + line.strip()
else:
i = line.find(':')
# We're being liberal in what we accept, here.
if i > 0:
name = line[:i]
value = line[i+1:].strip()
ret.append([name, value])
else:
return None
return odict.ODictCaseless(ret)
def read_chunked(code, fp, limit):
"""
Read a chunked HTTP body.
May raise HttpError.
"""
content = ""
total = 0
while 1:
line = fp.readline(128)
if line == "":
raise HttpErrorConnClosed(code, "Connection closed prematurely")
if line != '\r\n' and line != '\n':
try:
length = int(line, 16)
except ValueError:
# FIXME: Not strictly correct - this could be from the server, in which
# case we should send a 502.
raise HttpError(code, "Invalid chunked encoding length: %s"%line)
if not length:
break
total += length
if limit is not None and total > limit:
msg = "HTTP Body too large."\
" Limit is %s, chunked content length was at least %s"%(limit, total)
raise HttpError(code, msg)
content += fp.read(length)
line = fp.readline(5)
if line != '\r\n':
raise HttpError(code, "Malformed chunked body")
while 1:
line = fp.readline()
if line == "":
raise HttpErrorConnClosed(code, "Connection closed prematurely")
if line == '\r\n' or line == '\n':
break
return content
def get_header_tokens(headers, key):
"""
Retrieve all tokens for a header key. A number of different headers
follow a pattern where each header line can containe comma-separated
tokens, and headers can be set multiple times.
"""
toks = []
for i in headers[key]:
for j in i.split(","):
toks.append(j.strip())
return toks
def has_chunked_encoding(headers):
return "chunked" in [i.lower() for i in get_header_tokens(headers, "transfer-encoding")]
def read_http_body(code, rfile, headers, all, limit):
"""
Read an HTTP body:
code: The HTTP error code to be used when raising HttpError
rfile: A file descriptor to read from
headers: An ODictCaseless object
all: Should we read all data?
limit: Size limit.
"""
if has_chunked_encoding(headers):
content = read_chunked(code, rfile, limit)
elif "content-length" in headers:
try:
l = int(headers["content-length"][0])
except ValueError:
# FIXME: Not strictly correct - this could be from the server, in which
# case we should send a 502.
raise HttpError(code, "Invalid content-length header: %s"%headers["content-length"])
if limit is not None and l > limit:
raise HttpError(code, "HTTP Body too large. Limit is %s, content-length was %s"%(limit, l))
content = rfile.read(l)
elif all:
content = rfile.read(limit if limit else -1)
else:
content = ""
return content
def parse_http_protocol(s):
"""
Parse an HTTP protocol declaration. Returns a (major, minor) tuple, or
None.
"""
if not s.startswith("HTTP/"):
return None
_, version = s.split('/', 1)
if "." not in version:
return None
major, minor = version.split('.', 1)
try:
major = int(major)
minor = int(minor)
except ValueError:
return None
return major, minor
def parse_http_basic_auth(s):
words = s.split()
if len(words) != 2:
return None
scheme = words[0]
try:
user = binascii.a2b_base64(words[1])
except binascii.Error:
return None
parts = user.split(':')
if len(parts) != 2:
return None
return scheme, parts[0], parts[1]
def assemble_http_basic_auth(scheme, username, password):
v = binascii.b2a_base64(username + ":" + password)
return scheme + " " + v
def parse_init(line):
try:
method, url, protocol = string.split(line)
except ValueError:
return None
httpversion = parse_http_protocol(protocol)
if not httpversion:
return None
if not utils.isascii(method):
return None
return method, url, httpversion
def parse_init_connect(line):
v = parse_init(line)
if not v:
return None
method, url, httpversion = v
if method.upper() != 'CONNECT':
return None
try:
host, port = url.split(":")
except ValueError:
return None
try:
port = int(port)
except ValueError:
return None
if not _is_valid_port(port):
return None
if not _is_valid_host(host):
return None
return host, port, httpversion
def parse_init_proxy(line):
v = parse_init(line)
if not v:
return None
method, url, httpversion = v
parts = parse_url(url)
if not parts:
return None
scheme, host, port, path = parts
return method, scheme, host, port, path, httpversion
def parse_init_http(line):
"""
Returns (method, url, httpversion)
"""
v = parse_init(line)
if not v:
return None
method, url, httpversion = v
if not utils.isascii(url):
return None
if not (url.startswith("/") or url == "*"):
return None
return method, url, httpversion
def request_connection_close(httpversion, headers):
"""
Checks the request to see if the client connection should be closed.
"""
if "connection" in headers:
toks = get_header_tokens(headers, "connection")
if "close" in toks:
return True
elif "keep-alive" in toks:
return False
# HTTP 1.1 connections are assumed to be persistent
if httpversion == (1, 1):
return False
return True
def response_connection_close(httpversion, headers):
"""
Checks the response to see if the client connection should be closed.
"""
if request_connection_close(httpversion, headers):
return True
elif (not has_chunked_encoding(headers)) and "content-length" in headers:
return False
return True
def read_http_body_request(rfile, wfile, headers, httpversion, limit):
"""
Read the HTTP body from a client request.
"""
if "expect" in headers:
# FIXME: Should be forwarded upstream
if "100-continue" in headers['expect'] and httpversion >= (1, 1):
wfile.write('HTTP/1.1 100 Continue\r\n')
wfile.write('\r\n')
del headers['expect']
return read_http_body(400, rfile, headers, False, limit)
def read_http_body_response(rfile, headers, limit):
"""
Read the HTTP body from a server response.
"""
all = "close" in get_header_tokens(headers, "connection")
return read_http_body(500, rfile, headers, all, limit)
def parse_response_line(line):
parts = line.strip().split(" ", 2)
if len(parts) == 2: # handle missing message gracefully
parts.append("")
if len(parts) != 3:
return None
proto, code, msg = parts
try:
code = int(code)
except ValueError:
return None
return (proto, code, msg)
def read_response(rfile, method, body_size_limit):
"""
Return an (httpversion, code, msg, headers, content) tuple.
"""
line = rfile.readline()
if line == "\r\n" or line == "\n": # Possible leftover from previous message
line = rfile.readline()
if not line:
raise HttpErrorConnClosed(502, "Server disconnect.")
parts = parse_response_line(line)
if not parts:
raise HttpError(502, "Invalid server response: %s"%repr(line))
proto, code, msg = parts
httpversion = parse_http_protocol(proto)
if httpversion is None:
raise HttpError(502, "Invalid HTTP version in line: %s"%repr(proto))
headers = read_headers(rfile)
if headers is None:
raise HttpError(502, "Invalid headers.")
if code >= 100 and code <= 199:
return read_response(rfile, method, body_size_limit)
if method == "HEAD" or code == 204 or code == 304:
content = ""
else:
content = read_http_body_response(rfile, headers, body_size_limit)
return httpversion, code, msg, headers, content
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