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import time
import typing # noqa
import uuid
from mitmproxy import connections
from mitmproxy import controller, exceptions # noqa
from mitmproxy import stateobject
from mitmproxy import version
class Error(stateobject.StateObject):
"""
An Error.
This is distinct from an protocol error response (say, a HTTP code 500),
which is represented by a normal HTTPResponse object. This class is
responsible for indicating errors that fall outside of normal protocol
communications, like interrupted connections, timeouts, protocol errors.
Exposes the following attributes:
msg: Message describing the error
timestamp: Seconds since the epoch
"""
def __init__(self, msg: str, timestamp=None) -> None:
"""
@type msg: str
@type timestamp: float
"""
self.msg = msg
self.timestamp = timestamp or time.time()
_stateobject_attributes = dict(
msg=str,
timestamp=float
)
def __str__(self):
return self.msg
def __repr__(self):
return self.msg
@classmethod
def from_state(cls, state):
# the default implementation assumes an empty constructor. Override
# accordingly.
f = cls(None)
f.set_state(state)
return f
class Flow(stateobject.StateObject):
"""
A Flow is a collection of objects representing a single transaction.
This class is usually subclassed for each protocol, e.g. HTTPFlow.
"""
def __init__(
self,
type: str,
client_conn: connections.ClientConnection,
server_conn: connections.ServerConnection,
live: bool=None
) -> None:
self.type = type
self.id = str(uuid.uuid4())
self.client_conn = client_conn
self.server_conn = server_conn
self.live = live
self.error: typing.Optional[Error] = None
self.intercepted: bool = False
self._backup: typing.Optional[Flow] = None
self.reply: typing.Optional[controller.Reply] = None
self.marked: bool = False
self.metadata: typing.Dict[str, typing.Any] = dict()
_stateobject_attributes = dict(
id=str,
error=Error,
client_conn=connections.ClientConnection,
server_conn=connections.ServerConnection,
type=str,
intercepted=bool,
marked=bool,
metadata=typing.Dict[str, typing.Any],
)
def get_state(self):
d = super().get_state()
d.update(version=version.FLOW_FORMAT_VERSION)
if self._backup and self._backup != d:
d.update(backup=self._backup)
return d
def set_state(self, state):
state = state.copy()
state.pop("version")
if "backup" in state:
self._backup = state.pop("backup")
super().set_state(state)
@classmethod
def from_state(cls, state):
f = cls(None, None)
f.set_state(state)
return f
def copy(self):
f = super().copy()
f.live = False
if self.reply is not None:
f.reply = controller.DummyReply()
return f
def modified(self):
"""
Has this Flow been modified?
"""
if self._backup:
return self._backup != self.get_state()
else:
return False
def backup(self, force=False):
"""
Save a backup of this Flow, which can be reverted to using a
call to .revert().
"""
if not self._backup:
self._backup = self.get_state()
def revert(self):
"""
Revert to the last backed up state.
"""
if self._backup:
self.set_state(self._backup)
self._backup = None
@property
def killable(self):
return (
self.reply and
self.reply.state in {"start", "taken"} and
self.reply.value != exceptions.Kill
)
def kill(self):
"""
Kill this request.
"""
self.error = Error("Connection killed")
self.intercepted = False
self.reply.kill(force=True)
self.live = False
def intercept(self):
"""
Intercept this Flow. Processing will stop until resume is
called.
"""
if self.intercepted:
return
self.intercepted = True
self.reply.take()
def resume(self):
"""
Continue with the flow - called after an intercept().
"""
if not self.intercepted:
return
self.intercepted = False
# If a flow is intercepted and then duplicated, the duplicated one is not taken.
if self.reply.state == "taken":
self.reply.ack()
self.reply.commit()
|
