84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
import logging
|
|
import re
|
|
from collections.abc import Sequence
|
|
|
|
from mitmproxy import ctx
|
|
from mitmproxy import exceptions
|
|
from mitmproxy.addons.modifyheaders import ModifySpec
|
|
from mitmproxy.addons.modifyheaders import parse_modify_spec
|
|
from mitmproxy.log import ALERT
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class ModifyBody:
|
|
def __init__(self) -> None:
|
|
self.replacements: list[ModifySpec] = []
|
|
|
|
def load(self, loader):
|
|
loader.add_option(
|
|
"modify_body",
|
|
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)
|
|
|
|
stream_and_modify_conflict = (
|
|
ctx.options.modify_body
|
|
and ctx.options.stream_large_bodies
|
|
and ("modify_body" in updated or "stream_large_bodies" in updated)
|
|
)
|
|
if stream_and_modify_conflict:
|
|
logger.log(
|
|
ALERT,
|
|
"Both modify_body and stream_large_bodies are active. "
|
|
"Streamed bodies will not be modified.",
|
|
)
|
|
|
|
def request(self, flow):
|
|
if flow.response or flow.error or not flow.live:
|
|
return
|
|
self.run(flow)
|
|
|
|
def response(self, flow):
|
|
if flow.error or not flow.live:
|
|
return
|
|
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:
|
|
logging.warning(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
|
|
)
|