Current File : //usr/lib/python3/dist-packages/mitmproxy/addons/modifybody.py
import re
import typing
from mitmproxy import ctx, exceptions
from mitmproxy.addons.modifyheaders import parse_modify_spec, ModifySpec
class ModifyBody:
def __init__(self):
self.replacements: typing.List[ModifySpec] = []
def load(self, loader):
loader.add_option(
"modify_body", typing.Sequence[str], [],
"""
Replacement pattern of the form "[/flow-filter]/regex/[@]replacement", where
the separator can be any character. The @ allows to provide a file path that
is used to read the replacement string.
"""
)
def configure(self, updated):
if "modify_body" in updated:
self.replacements = []
for option in ctx.options.modify_body:
try:
spec = parse_modify_spec(option, True)
except ValueError as e:
raise exceptions.OptionsError(f"Cannot parse modify_body option {option}: {e}") from e
self.replacements.append(spec)
def request(self, flow):
if not flow.reply.has_message:
self.run(flow)
def response(self, flow):
if not flow.reply.has_message:
self.run(flow)
def run(self, flow):
for spec in self.replacements:
if spec.matches(flow):
try:
replacement = spec.read_replacement()
except OSError as e:
ctx.log.warn(f"Could not read replacement file: {e}")
continue
if flow.response:
flow.response.content = re.sub(spec.subject, replacement, flow.response.content, flags=re.DOTALL)
else:
flow.request.content = re.sub(spec.subject, replacement, flow.request.content, flags=re.DOTALL)
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