#!/usr/bin/env python3

"""

# Purpose: For Gmail User(s), list/delete all filters that forward email outside of a list of specified domains

# Customize: Set DOMAIN_LIST.

# Python: Use python or python3 below as appropriate to your system; verify that you have version 3

# $ python -V or python3 -V

# Python 3.x.y

# Usage:

# 1: Get filters, if you don't want all users, replace all users with your user selection in the command below

# $ Example: gam config auto_batch_min 1 redirect csv ./filters.csv multiprocess all users print filters

# 2: From that list of filters, output a CSV file that lists the filters that forward email outside of the specified domains.

# $ python3 GetNonDomainFilterForwards.py filters.csv outsidefilters.csv

# 3: Inspect outsidefilters.csv, verify that it makes sense and then proceed

# 4: If desired, delete the filters

# $ gam csv ./outsidefilters.csv gam user "~User" delete filter "~id"

"""

import csv

import re

import sys

# Substitute your domain(s) in the list below, e.g., DOMAIN_LIST = ['domain.com',] DOMAIN_LIST = ['domain1.com', 'domain2.com',]

DOMAIN_LIST = ['domain.com',]

QUOTE_CHAR = '"' # Adjust as needed

LINE_TERMINATOR = '\n' # On Windows, you probably want '\r\n'

FORWARD_DOMAIN = re.compile(r"^forward .*@(.*)$")

if (len(sys.argv) > 2) and (sys.argv[2] != '-'):

outputFile = open(sys.argv[2], 'w', encoding='utf-8', newline='')

else:

outputFile = sys.stdout

if (len(sys.argv) > 1) and (sys.argv[1] != '-'):

inputFile = open(sys.argv[1], 'r', encoding='utf-8')

else:

inputFile = sys.stdin

inputCSV = csv.DictReader(inputFile, quotechar=QUOTE_CHAR)

outputCSV = csv.DictWriter(outputFile, inputCSV.fieldnames, lineterminator=LINE_TERMINATOR, quotechar=QUOTE_CHAR)

outputCSV.writeheader()

for row in inputCSV:

v = row.get('forward', '')

if v:

mg = FORWARD_DOMAIN.match(v)

if mg and mg.group(1) not in DOMAIN_LIST:

outputCSV.writerow(row)

if inputFile != sys.stdin:

inputFile.close()

if outputFile != sys.stdout:

outputFile.close()