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import pyparsing as pp
from netlib import http
from netlib.http import user_agents, Headers
from . import base, message
"""
Normal HTTP requests:
<method>:<path>:<header>:<body>
e.g.:
GET:/
GET:/:h"foo"="bar"
POST:/:h"foo"="bar":b'content body payload'
Normal HTTP responses:
<code>:<header>:<body>
e.g.:
200
302:h"foo"="bar"
404:h"foo"="bar":b'content body payload'
Individual HTTP/2 frames:
h2f:<payload_length>:<type>:<flags>:<stream_id>:<payload>
e.g.:
h2f:0:PING
h2f:42:HEADERS:END_HEADERS:0x1234567:foo=bar,host=example.com
h2f:42:DATA:END_STREAM,PADDED:0x1234567:'content body payload'
"""
def get_header(val, headers):
"""
Header keys may be Values, so we have to "generate" them as we try the
match.
"""
for h in headers:
k = h.key.get_generator({})
if len(k) == len(val) and k[:].lower() == val.lower():
return h
return None
class _HeaderMixin(object):
unique_name = None
def values(self, settings):
return (
self.key.get_generator(settings),
self.value.get_generator(settings),
)
class _HTTP2Message(message.Message):
@property
def actions(self):
return [] # self.toks(actions._Action)
@property
def headers(self):
headers = self.toks(_HeaderMixin)
if not self.raw:
if not get_header(b"content-length", headers):
if not self.body:
length = 0
else:
length = len(self.body.string())
headers.append(
Header(
base.TokValueLiteral("content-length"),
base.TokValueLiteral(str(length)),
)
)
return headers
@property
def raw(self):
return bool(self.tok(Raw))
@property
def body(self):
return self.tok(Body)
def resolve(self, settings):
return self
class StatusCode(base.Integer):
pass
class Method(base.OptionsOrValue):
options = [
"GET",
"HEAD",
"POST",
"PUT",
"DELETE",
]
class Path(base.Value):
pass
class Header(_HeaderMixin, base.KeyValue):
preamble = "h"
class ShortcutContentType(_HeaderMixin, base.Value):
preamble = "c"
key = base.TokValueLiteral("content-type")
class ShortcutLocation(_HeaderMixin, base.Value):
preamble = "l"
key = base.TokValueLiteral("location")
class ShortcutUserAgent(_HeaderMixin, base.OptionsOrValue):
preamble = "u"
options = [i[1] for i in user_agents.UASTRINGS]
key = base.TokValueLiteral("user-agent")
def values(self, settings):
value = self.value.val
if self.option_used:
value = user_agents.get_by_shortcut(value.lower().decode())[2].encode()
return (
self.key.get_generator(settings),
value
)
class Raw(base.CaselessLiteral):
TOK = "r"
class Body(base.Value):
preamble = "b"
class Times(base.Integer):
preamble = "x"
class Response(_HTTP2Message):
unique_name = None
comps = (
Header,
Body,
ShortcutContentType,
ShortcutLocation,
Raw,
)
def __init__(self, tokens):
super(Response, self).__init__(tokens)
self.rendered_values = None
self.stream_id = 2
@property
def status_code(self):
return self.tok(StatusCode)
@classmethod
def expr(cls):
parts = [i.expr() for i in cls.comps]
atom = pp.MatchFirst(parts)
resp = pp.And(
[
StatusCode.expr(),
pp.ZeroOrMore(base.Sep + atom)
]
)
resp = resp.setParseAction(cls)
return resp
def values(self, settings):
if self.rendered_values:
return self.rendered_values
else:
headers = Headers([header.values(settings) for header in self.headers])
body = self.body
if body:
body = body.string()
resp = http.Response(
b'HTTP/2.0',
self.status_code.string(),
b'',
headers,
body,
)
resp.stream_id = self.stream_id
self.rendered_values = settings.protocol.assemble(resp)
return self.rendered_values
def spec(self):
return ":".join([i.spec() for i in self.tokens])
class NestedResponse(base.NestedMessage):
preamble = "s"
nest_type = Response
class Request(_HTTP2Message):
comps = (
Header,
ShortcutContentType,
ShortcutUserAgent,
Raw,
NestedResponse,
Body,
Times,
)
logattrs = ["method", "path"]
def __init__(self, tokens):
super(Request, self).__init__(tokens)
self.rendered_values = None
self.stream_id = 1
@property
def method(self):
return self.tok(Method)
@property
def path(self):
return self.tok(Path)
@property
def nested_response(self):
return self.tok(NestedResponse)
@property
def times(self):
return self.tok(Times)
@classmethod
def expr(cls):
parts = [i.expr() for i in cls.comps]
atom = pp.MatchFirst(parts)
resp = pp.And(
[
Method.expr(),
base.Sep,
Path.expr(),
pp.ZeroOrMore(base.Sep + atom)
]
)
resp = resp.setParseAction(cls)
return resp
def values(self, settings):
if self.rendered_values:
return self.rendered_values
else:
path = self.path.string()
if self.nested_response:
path += self.nested_response.parsed.spec().encode()
headers = Headers([header.values(settings) for header in self.headers])
body = self.body
if body:
body = body.string()
req = http.Request(
b'',
self.method.string(),
b'http',
b'',
b'',
path,
(2, 0),
headers,
body,
)
req.stream_id = self.stream_id
self.rendered_values = settings.protocol.assemble(req)
return self.rendered_values
def spec(self):
return ":".join([i.spec() for i in self.tokens])
def make_error_response(reason, body=None):
tokens = [
StatusCode("800"),
Body(base.TokValueLiteral("pathod error: " + (body or reason))),
]
return Response(tokens)
|
