插件通过事件挂钩到mitmproxy的内部机制的实现。这些事作为具有一组众所周知的名称的方法在插件上实现的。许多事件接收Flow对象作为参数， 通过修改这些对象，插件可以动态更改请求。
下面是一个插件类，它为为所有事件做了实现。
import typing
import mitmproxy.addonmanager
import mitmproxy.connections
import mitmproxy.http
import mitmproxy.log
import mitmproxy.tcp
import mitmproxy.websocket
import mitmproxy.proxy.protocol
class Events:
# HTTP lifecycle
def http_connect(self, flow: mitmproxy.http.HTTPFlow):
"""
An HTTP CONNECT request was received. Setting a non 2xx response on
the flow will return the response to the client abort the
connection. CONNECT requests and responses do not generate the usual
HTTP handler events. CONNECT requests are only valid in regular and
upstream proxy modes.
"""
def requestheaders(self, flow: mitmproxy.http.HTTPFlow):
"""
HTTP request headers were successfully read. At this point, the body
is empty.
"""
def request(self, flow: mitmproxy.http.HTTPFlow):
"""
The full HTTP request has been read.
"""
def responseheaders(self, flow: mitmproxy.http.HTTPFlow):
"""
HTTP response headers were successfully read. At this point, the body
is empty.
"""
def response(self, flow: mitmproxy.http.HTTPFlow):
"""
The full HTTP response has been read.
"""
def error(self, flow: mitmproxy.http.HTTPFlow):
"""
An HTTP error has occurred, e.g. invalid server responses, or
interrupted connections. This is distinct from a valid server HTTP
error response, which is simply a response with an HTTP error code.
"""
# TCP lifecycle
def tcp_start(self, flow: mitmproxy.tcp.TCPFlow):
"""
A TCP connection has started.
"""
def tcp_message(self, flow: mitmproxy.tcp.TCPFlow):
"""
A TCP connection has received a message. The most recent message
will be flow.messages[-1]. The message is user-modifiable.
"""
def tcp_error(self, flow: mitmproxy.tcp.TCPFlow):
"""
A TCP error has occurred.
"""
def tcp_end(self, flow: mitmproxy.tcp.TCPFlow):
"""
A TCP connection has ended.
"""
# Websocket lifecycle
def websocket_handshake(self, flow: mitmproxy.http.HTTPFlow):
"""
Called when a client wants to establish a WebSocket connection. The
WebSocket-specific headers can be manipulated to alter the
handshake. The flow object is guaranteed to have a non-None request
attribute.
"""
def websocket_start(self, flow: mitmproxy.websocket.WebSocketFlow):
"""
A websocket connection has commenced.
"""
def websocket_message(self, flow: mitmproxy.websocket.WebSocketFlow):
"""
Called when a WebSocket message is received from the client or
server. The most recent message will be flow.messages[-1]. The
message is user-modifiable. Currently there are two types of
messages, corresponding to the BINARY and TEXT frame types.
"""
def websocket_error(self, flow: mitmproxy.websocket.WebSocketFlow):
"""
A websocket connection has had an error.
"""
def websocket_end(self, flow: mitmproxy.websocket.WebSocketFlow):
"""
A websocket connection has ended.
"""
# Network lifecycle
def clientconnect(self, layer: mitmproxy.proxy.protocol.Layer):
"""
A client has connected to mitmproxy. Note that a connection can
correspond to multiple HTTP requests.
"""
def clientdisconnect(self, layer: mitmproxy.proxy.protocol.Layer):
"""
A client has disconnected from mitmproxy.
"""
def serverconnect(self, conn: mitmproxy.connections.ServerConnection):
"""
Mitmproxy has connected to a server. Note that a connection can
correspond to multiple requests.
"""
def serverdisconnect(self, conn: mitmproxy.connections.ServerConnection):
"""
Mitmproxy has disconnected from a server.
"""
def next_layer(self, layer: mitmproxy.proxy.protocol.Layer):
"""
Network layers are being switched. You may change which layer will
be used by returning a new layer object from this event.
"""
# General lifecycle
def configure(self, updated: typing.Set[str]):
"""
Called when configuration changes. The updated argument is a
set-like object containing the keys of all changed options. This
event is called during startup with all options in the updated set.
"""
def done(self):
"""
Called when the addon shuts down, either by being removed from
the mitmproxy instance, or when mitmproxy itself shuts down. On
shutdown, this event is called after the event loop is
terminated, guaranteeing that it will be the final event an addon
sees. Note that log handlers are shut down at this point, so
calls to log functions will produce no output.
"""
def load(self, entry: mitmproxy.addonmanager.Loader):
"""
Called when an addon is first loaded. This event receives a Loader
object, which contains methods for adding options and commands. This
method is where the addon configures itself.
"""
def log(self, entry: mitmproxy.log.LogEntry):
"""
Called whenever a new log entry is created through the mitmproxy
context. Be careful not to log from this event, which will cause an
infinite loop!
"""
def running(self):
"""
Called when the proxy is completely up and running. At this point,
you can expect the proxy to be bound to a port, and all addons to be
loaded.
"""
def update(self, flows: typing.Sequence[mitmproxy.flow.Flow]):
"""
Update is called when one or more flow objects have been modified,
usually from a different addon.
"""
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