mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-23 16:17:49 +00:00
145 lines
4.1 KiB
Python
145 lines
4.1 KiB
Python
import abc
|
|
import typing # noqa
|
|
|
|
import pyparsing as pp
|
|
|
|
from mitmproxy.utils import strutils
|
|
from . import actions, exceptions, base
|
|
|
|
LOG_TRUNCATE = 1024
|
|
|
|
|
|
class Message:
|
|
__metaclass__ = abc.ABCMeta
|
|
logattrs: typing.List[str] = []
|
|
|
|
def __init__(self, tokens):
|
|
track = set([])
|
|
for i in tokens:
|
|
if i.unique_name:
|
|
if i.unique_name in track:
|
|
raise exceptions.ParseException(
|
|
"Message has multiple %s clauses, "
|
|
"but should only have one." % i.unique_name,
|
|
0, 0
|
|
)
|
|
else:
|
|
track.add(i.unique_name)
|
|
self.tokens = tokens
|
|
|
|
def strike_token(self, name):
|
|
toks = [i for i in self.tokens if i.unique_name != name]
|
|
return self.__class__(toks)
|
|
|
|
def toks(self, klass):
|
|
"""
|
|
Fetch all tokens that are instances of klass
|
|
"""
|
|
return [i for i in self.tokens if isinstance(i, klass)]
|
|
|
|
def tok(self, klass):
|
|
"""
|
|
Fetch first token that is an instance of klass
|
|
"""
|
|
l = self.toks(klass)
|
|
if l:
|
|
return l[0]
|
|
|
|
def length(self, settings):
|
|
"""
|
|
Calculate the length of the base message without any applied
|
|
actions.
|
|
"""
|
|
return sum(len(x) for x in self.values(settings))
|
|
|
|
def preview_safe(self):
|
|
"""
|
|
Return a copy of this message that is safe for previews.
|
|
"""
|
|
tokens = [i for i in self.tokens if not isinstance(i, actions.PauseAt)]
|
|
return self.__class__(tokens)
|
|
|
|
def maximum_length(self, settings):
|
|
"""
|
|
Calculate the maximum length of the base message with all applied
|
|
actions.
|
|
"""
|
|
l = self.length(settings)
|
|
for i in self.actions:
|
|
if isinstance(i, actions.InjectAt):
|
|
l += len(i.value.get_generator(settings))
|
|
return l
|
|
|
|
@classmethod
|
|
def expr(cls): # pragma: no cover
|
|
pass
|
|
|
|
def log(self, settings):
|
|
"""
|
|
A dictionary that should be logged if this message is served.
|
|
"""
|
|
ret = {}
|
|
for i in self.logattrs:
|
|
v = getattr(self, i)
|
|
# Careful not to log any VALUE specs without sanitizing them first.
|
|
# We truncate at 1k.
|
|
if hasattr(v, "values"):
|
|
v = [x[:LOG_TRUNCATE] for x in v.values(settings)]
|
|
v = strutils.bytes_to_escaped_str(b"".join(v))
|
|
elif hasattr(v, "__len__"):
|
|
v = v[:LOG_TRUNCATE]
|
|
v = strutils.bytes_to_escaped_str(v)
|
|
ret[i] = v
|
|
ret["spec"] = self.spec()
|
|
return ret
|
|
|
|
def freeze(self, settings):
|
|
r = self.resolve(settings)
|
|
return self.__class__([i.freeze(settings) for i in r.tokens])
|
|
|
|
def __repr__(self):
|
|
return self.spec()
|
|
|
|
|
|
class NestedMessage(base.Token):
|
|
"""
|
|
A nested message, as an escaped string with a preamble.
|
|
"""
|
|
preamble = ""
|
|
nest_type: typing.Optional[typing.Type[Message]] = None
|
|
|
|
def __init__(self, value):
|
|
super().__init__()
|
|
self.value = value
|
|
try:
|
|
self.parsed = self.nest_type(
|
|
self.nest_type.expr().parseString(
|
|
value.val.decode(),
|
|
parseAll=True
|
|
)
|
|
)
|
|
except pp.ParseException as v:
|
|
raise exceptions.ParseException(v.msg, v.line, v.col)
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
e = pp.Literal(cls.preamble).suppress()
|
|
e = e + base.TokValueLiteral.expr()
|
|
return e.setParseAction(lambda x: cls(*x))
|
|
|
|
def values(self, settings):
|
|
return [
|
|
self.value.get_generator(settings),
|
|
]
|
|
|
|
def spec(self):
|
|
return "%s%s" % (self.preamble, self.value.spec())
|
|
|
|
def freeze(self, settings):
|
|
f = self.parsed.freeze(settings).spec()
|
|
return self.__class__(
|
|
base.TokValueLiteral(
|
|
strutils.bytes_to_escaped_str(f.encode(), escape_single_quotes=True)
|
|
)
|
|
)
|