69 lines
2.1 KiB
Python
69 lines
2.1 KiB
Python
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import re
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from collections.abc import Sequence
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from typing import NamedTuple
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from mitmproxy import ctx
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from mitmproxy import exceptions
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from mitmproxy import flowfilter
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from mitmproxy import http
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from mitmproxy.utils.spec import parse_spec
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class MapRemoteSpec(NamedTuple):
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matches: flowfilter.TFilter
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subject: str
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replacement: str
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def parse_map_remote_spec(option: str) -> MapRemoteSpec:
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spec = MapRemoteSpec(*parse_spec(option))
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try:
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re.compile(spec.subject)
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except re.error as e:
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raise ValueError(f"Invalid regular expression {spec.subject!r} ({e})")
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return spec
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class MapRemote:
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def __init__(self) -> None:
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self.replacements: list[MapRemoteSpec] = []
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def load(self, loader):
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loader.add_option(
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"map_remote",
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Sequence[str],
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[],
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"""
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Map remote resources to another remote URL using a pattern of the form
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"[/flow-filter]/url-regex/replacement", where the separator can
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be any character.
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""",
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)
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def configure(self, updated):
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if "map_remote" in updated:
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self.replacements = []
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for option in ctx.options.map_remote:
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try:
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spec = parse_map_remote_spec(option)
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except ValueError as e:
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raise exceptions.OptionsError(
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f"Cannot parse map_remote option {option}: {e}"
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) from e
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self.replacements.append(spec)
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def request(self, flow: http.HTTPFlow) -> None:
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if flow.response or flow.error or not flow.live:
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return
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for spec in self.replacements:
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if spec.matches(flow):
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url = flow.request.pretty_url
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new_url = re.sub(spec.subject, spec.replacement, url)
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# this is a bit messy: setting .url also updates the host header,
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# so we really only do that if the replacement affected the URL.
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if url != new_url:
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flow.request.url = new_url # type: ignore
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