雑にCloudFrontのログにあるURLエンコーディングをデコードする

cloudfrontlogdecoder.py

import csv
import sys
from urllib.parse import unquote
from urllib.parse import unquote_plus


def decode(filename):
    with open(filename, 'r') as f:
        reader = csv.reader(f, delimiter='\t')
        for row in reader:
            print('\t'.join(decode_line(row)))


def decode_line(fields):
    for i, field in enumerate(fields):
        fields[i] = unquote_plus(unquote(unquote(field)))
    return fields


decode(sys.argv[1])