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"""
This scripts demonstrates how to use mitmproxy's filter pattern in scripts.
Usage:
    mitmdump -s "flowfilter.py FILTER"
"""
import sys
from mitmproxy import flowfilter


class Filter:
    def __init__(self, spec):
        self.filter = flowfilter.parse(spec)

    def response(self, flow):
        if flowfilter.match(self.filter, flow):
            print("Flow matches filter:")
            print(flow)


def start(opts):
    if len(sys.argv) != 2:
        raise ValueError("Usage: -s 'filt.py FILTER'")
    return Filter(sys.argv[1])