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from __future__ import absolute_import
import os, traceback, threading, shlex
from . import controller
class ScriptError(Exception):
pass
class ScriptContext:
def __init__(self, master):
self._master = master
def log(self, message, level="info"):
"""
Logs an event.
By default, only events with level "error" get displayed. This can be controlled with the "-v" switch.
How log messages are handled depends on the front-end. mitmdump will print them to stdout,
mitmproxy sends output to the eventlog for display ("e" keyboard shortcut).
"""
self._master.add_event(message, level)
def duplicate_flow(self, f):
"""
Returns a duplicate of the specified flow. The flow is also
injected into the current state, and is ready for editing, replay,
etc.
"""
self._master.pause_scripts = True
f = self._master.duplicate_flow(f)
self._master.pause_scripts = False
return f
def replay_request(self, f):
"""
Replay the request on the current flow. The response will be added
to the flow object.
"""
self._master.replay_request(f)
@property
def app_registry(self):
return self._master.apps
class Script:
"""
The instantiator should do something along this vein:
s = Script(argv, master)
s.load()
"""
def __init__(self, command, master):
self.command = command
self.argv = self.parse_command(command)
self.ctx = ScriptContext(master)
self.ns = None
self.load()
@classmethod
def parse_command(klass, command):
if not command or not command.strip():
raise ScriptError("Empty script command.")
if os.name == "nt": # Windows: escape all backslashes in the path.
backslashes = shlex.split(command, posix=False)[0].count("\\")
command = command.replace("\\", "\\\\", backslashes)
args = shlex.split(command)
args[0] = os.path.expanduser(args[0])
if not os.path.exists(args[0]):
raise ScriptError(("Script file not found: %s.\r\n"
"If you script path contains spaces, "
"make sure to wrap it in additional quotes, e.g. -s \"'./foo bar/baz.py' --args\".") % args[0])
elif not os.path.isfile(args[0]):
raise ScriptError("Not a file: %s" % args[0])
return args
def load(self):
"""
Loads a module.
Raises ScriptError on failure, with argument equal to an error
message that may be a formatted traceback.
"""
ns = {}
try:
execfile(self.argv[0], ns, ns)
except Exception, v:
raise ScriptError(traceback.format_exc(v))
self.ns = ns
r = self.run("start", self.argv)
if not r[0] and r[1]:
raise ScriptError(r[1][1])
def unload(self):
return self.run("done")
def run(self, name, *args, **kwargs):
"""
Runs a plugin method.
Returns:
(True, retval) on success.
(False, None) on nonexistent method.
(False, (exc, traceback string)) if there was an exception.
"""
f = self.ns.get(name)
if f:
try:
return (True, f(self.ctx, *args, **kwargs))
except Exception, v:
return (False, (v, traceback.format_exc(v)))
else:
return (False, None)
class ReplyProxy(object):
def __init__(self, original_reply):
self._ignore_calls = 1
self.lock = threading.Lock()
self.original_reply = original_reply
def __call__(self, *args, **kwargs):
with self.lock:
if self._ignore_calls > 0:
self._ignore_calls -= 1
return
self.original_reply(*args, **kwargs)
def __getattr__ (self, k):
return getattr(self.original_reply, k)
def _handle_concurrent_reply(fn, o, *args, **kwargs):
# Make first call to o.reply a no op
reply_proxy = ReplyProxy(o.reply)
o.reply = reply_proxy
def run():
fn(*args, **kwargs)
o.reply() # If the script did not call .reply(), we have to do it now.
threading.Thread(target=run, name="ScriptThread").start()
def concurrent(fn):
if fn.func_name in ("request", "response", "error", "clientconnect", "serverconnect", "clientdisconnect"):
def _concurrent(ctx, obj):
_handle_concurrent_reply(fn, obj, ctx, obj)
return _concurrent
raise NotImplementedError("Concurrent decorator not supported for this method.")
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