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from __future__ import absolute_import, print_function, division
import contextlib
import os
import shlex
import sys
import traceback
import copy
from mitmproxy import exceptions
from mitmproxy import controller
from mitmproxy import ctx
import watchdog.events
# The OSX reloader in watchdog 0.8.3 breaks when unobserving paths.
# We use the PollingObserver instead.
if sys.platform == 'darwin': # pragma: no cover
from watchdog.observers.polling import PollingObserver as Observer
else:
from watchdog.observers import Observer
def parse_command(command):
"""
Returns a (path, args) tuple.
"""
if not command or not command.strip():
raise exceptions.AddonError("Empty script command.")
# Windows: escape all backslashes in the path.
if os.name == "nt": # pragma: no cover
backslashes = shlex.split(command, posix=False)[0].count("\\")
command = command.replace("\\", "\\\\", backslashes)
args = shlex.split(command) # pragma: no cover
args[0] = os.path.expanduser(args[0])
if not os.path.exists(args[0]):
raise exceptions.AddonError(
("Script file not found: %s.\r\n"
"If your script path contains spaces, "
"make sure to wrap it in additional quotes, e.g. -s \"'./foo bar/baz.py' --args\".") %
args[0])
elif os.path.isdir(args[0]):
raise exceptions.AddonError("Not a file: %s" % args[0])
return args[0], args[1:]
@contextlib.contextmanager
def scriptenv(path, args):
oldargs = sys.argv
sys.argv = [path] + args
script_dir = os.path.dirname(os.path.abspath(path))
sys.path.append(script_dir)
try:
yield
except Exception:
_, _, tb = sys.exc_info()
scriptdir = os.path.dirname(os.path.abspath(path))
for i, s in enumerate(reversed(traceback.extract_tb(tb))):
if not os.path.abspath(s[0]).startswith(scriptdir):
break
else:
tb = tb.tb_next
ctx.log.warn("".join(traceback.format_tb(tb)))
finally:
sys.argv = oldargs
sys.path.pop()
def load_script(path, args):
ns = {'__file__': os.path.abspath(path)}
with scriptenv(path, args):
with open(path, "rb") as f:
code = compile(f.read(), path, 'exec')
exec(code, ns, ns)
return ns
class ReloadHandler(watchdog.events.FileSystemEventHandler):
def __init__(self, callback, master, options):
self.callback = callback
self.master, self.options = master, options
def on_modified(self, event):
self.callback(self.master, self.options)
def on_created(self, event):
self.callback(self.master, self.options)
class Script:
"""
An addon that manages a single script.
"""
def __init__(self, command):
self.name = command
self.command = command
self.path, self.args = parse_command(command)
self.ns = None
self.observer = None
for i in controller.Events:
def mkprox():
evt = i
def prox(*args, **kwargs):
self.run(evt, *args, **kwargs)
return prox
setattr(self, i, mkprox())
def run(self, name, *args, **kwargs):
# It's possible for ns to be un-initialised if we failed during
# configure
if self.ns is not None:
func = self.ns.get(name)
if func:
with scriptenv(self.path, self.args):
func(*args, **kwargs)
def reload(self, master, options):
with master.handlecontext():
self.ns = None
self.configure(options)
def configure(self, options):
if not self.observer:
self.observer = Observer()
# Bind the handler to the real underlying master object
self.observer.schedule(
ReloadHandler(
self.reload,
ctx.master,
copy.copy(options),
),
os.path.dirname(self.path) or "."
)
self.observer.start()
if not self.ns:
self.ns = load_script(self.path, self.args)
self.run("configure", options)
class ScriptLoader():
"""
An addon that manages loading scripts from options.
"""
def configure(self, options):
for s in options.scripts or []:
if not ctx.master.addons.has_addon(s):
ctx.log.info("Loading script: %s" % s)
sc = Script(s)
ctx.master.addons.add(sc)
for a in ctx.master.addons.chain:
if isinstance(a, Script):
if a.name not in options.scripts or []:
ctx.master.addons.remove(a)
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