google-authenticator-parse-db

#!/bin/sh

# Copyright (c) YEAR(S) Andrew Steel <copyright@andrewsteel.net>
#
# SPDX-License-Identifier: MIT
#
# The MIT License:
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

# google-authenticator-parse-db:
# Prints the data in a Google Authenticator database.
# The database can be retrieved from a rooted Android system at the path
# '/data/data/com.google.android.apps.authenticator2/databases/databases'

parse_args() {
	unset -v \
		arg_file \
		switch_color
	while test "${#}" -gt 0; do
		KEY="$(printf '%s' "${1}" | cut -d '=' -f 1)"
		VALUE="$(printf '%s' "${1}" | cut -s -d '=' -f 2-)"
		case "${KEY}" in
			( '--c' \
			| '--co' \
			| '--col' \
			| '--colo' \
			| '--color' )
				if test "${VALUE}"; then
					switch_color="${VALUE}"
				else
					switch_color="${2}"
					shift
				fi
				;;
			(*)
				arg_file="${1}"
				;;
		esac
		shift
	done
	FILE="${arg_file}"
	set_colors "${switch_color}"
}

set_colors() {
	if \
		test "${1}" != 'always' \
		&& test "${1}" != 'auto' \
		&& test "${1}" != 'never'
	then
		STATUS='auto'
	else
		STATUS="${1}"
	fi
	if \
		test "${STATUS}" == 'always' \
		|| { test "${STATUS}" == 'auto' && test -t 1; }
	then
		COLOR='always'
		COLOR_BOLD="$(printf '\033[1m')"
		COLOR_RESET="$(printf '\033[0m')"
	else
		COLOR='never'
		unset -v \
			COLOR_BOLD \
			COLOR_RESET
	fi
}

parse_args "${@}"
if ! test "${FILE}"; then
	printf '%s: %s\n' \
		"$(basename ${0})" \
		'no FILE defined' \
		>&2
	exit 1
fi

if test "$(command -v sqlite3)"; then
	sqlite3 "${FILE}" 'SELECT issuer, email, secret FROM accounts;' \
	| {
		if test "${COLOR}" != 'never'; then

			# Print visual layout.
			sed '1iISSUER|EMAIL|SECRET' \
			| tr '|' '\t' \
			| awk '

				BEGIN { SEPARATOR = "  " }

				{
					input[i++] = $0;
					if (length($1) > col1_length) col1_length = length($1);
					if (length($2) > col2_length) col2_length = length($2);
					if (length($3) > col3_length) col3_length = length($3);
				}

				END {
					for (i in input) {
						$0 = input[i];
						printf("%-" col1_length "s" SEPARATOR, $1);
						printf("%-" col2_length "s" SEPARATOR, $2);
						printf("%-" col3_length "s\n", $3);
					}
				}

			' \
			| sed '
				1s/[^[:space:]]*/'"${COLOR_BOLD}"'&'"${COLOR_RESET}"'/g
			'

		else

			# Print logical layout:
			# Fields are separated by tabs (for easy parsing by `cut`).
			tr '|' '\t'

		fi
	}
	exit 0
else
	printf '%s: %s\n' \
		"$(basename ${0})" \
		'`sqlite3` not in PATH' \
		>&2
	exit 2
fi