#!@BASH_SHELL@ -e
#
#   pacman-key - manages pacman's keyring
#                Based on apt-key, from Debian
#   @configure_input@
#
#   Copyright (c) 2010 - Pacman Development Team <pacman-dev@archlinux.org>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# gettext initialization
export TEXTDOMAIN='pacman'
export TEXTDOMAINDIR='@localedir@'

myver="@PACKAGE_VERSION@"

msg() {
	local mesg=$1; shift
	printf "==> ${mesg}\n" "$@" >&1
}

msg2() {
	(( QUIET )) && return
	local mesg=$1; shift
	printf "  -> ${mesg}\n" "$@" >&1
}

warning() {
	local mesg=$1; shift
	printf "==> $(gettext "WARNING:") ${mesg}\n" "$@" >&2
}

error() {
	local mesg=$1; shift
	printf "==> $(gettext "ERROR:") ${mesg}\n" "$@" >&2
}

usage() {
	printf "pacman-key (pacman) %s\n" ${myver}
	echo
	printf "$(gettext "Usage: %s [options] <command> [arguments]")\n" $(basename $0)
	echo
	echo "$(gettext "Manage pacman's list of trusted keys")"
	echo
	echo "$(gettext "Options must be placed before commands. The available options are:")"
	printf "$(gettext "  --config <file>  Use an alternate config file (instead of '%s')")\n" "$CONFIG"
	echo "$(gettext "  --gpgdir         Set an alternate directory for gnupg")"
	echo
	echo "$(gettext "The available commands are:")"
	echo "$(gettext "  -a, --add [<file(s)>]     Add the specified keys (empty for stdin)")"
	echo "$(gettext "  -d, --del <keyid(s)>      Remove the specified keyids")"
	echo "$(gettext "  -e, --export <keyid(s)>   Export the specified keyids")"
	echo "$(gettext "  -f, --finger [<keyid(s)>] List fingerprint for specified or all keyids")"
	echo "$(gettext "  -h, --help                This help")"
	echo "$(gettext "  -l, --list                List keys")"
	echo "$(gettext "  -r, --receive <keyserver> <keyid(s)> Fetch the specified keyids")"
	echo "$(gettext "  -t, --trust <keyid(s)>    Set the trust level of the given keyids")"
	echo "$(gettext "  -u, --updatedb            Update the trustdb of pacman")"
	echo "$(gettext "  -V, --version             Show program version")"
	echo "$(gettext "  --adv <params>            Use pacman's keyring with advanced gpg commands")"
	printf "$(gettext "  --reload                  Reload the default keys")"
	echo
}

version() {
	printf "pacman-key (pacman) %s\n" "${myver}"
	printf "$(gettext "\
Copyright (c) 2010-2011 Pacman Development Team <pacman-dev@archlinux.org>.\n\
This is free software; see the source for copying conditions.\n\
There is NO WARRANTY, to the extent permitted by law.\n")"
}

find_config() {
	# Prints on stdin the values of all the options from the configuration file that
	# are associated with the first parameter of this function.
	# The option names are stripped
	grep -e "^[[:blank:]]*$1[[:blank:]]*=.*" "$CONFIG" | cut -d= -f 2-
}

reload_keyring() {
	local PACMAN_SHARE_DIR='@prefix@/share/pacman'
	local GPG_NOKEYRING="gpg --batch --quiet --ignore-time-conflict --no-options --no-default-keyring --homedir ${PACMAN_KEYRING_DIR}"

	# Variable used for iterating on keyrings
	local key
	local key_id

	# Keyring with keys to be added to the keyring
	local ADDED_KEYS="${PACMAN_SHARE_DIR}/addedkeys.gpg"

	# Keyring with keys that were deprecated and will eventually be deleted
	local DEPRECATED_KEYS="${PACMAN_SHARE_DIR}/deprecatedkeys.gpg"

	# List of keys removed from the keyring. This file is not a keyring, unlike the others.
	# It is a textual list of values that gpg recogniezes as identifiers for keys.
	local REMOVED_KEYS="${PACMAN_SHARE_DIR}/removedkeys"

	# Verify signatures of related files, if they exist
	if [[ -r "${ADDED_KEYS}" ]]; then
		msg "$(gettext "Verifying official keys file signature...")"
		if ! ${GPG_PACMAN} --quiet --batch --verify "${ADDED_KEYS}.sig" 1>/dev/null; then
			error "$(gettext "The signature of file %s is not valid.")" "${ADDED_KEYS}"
			exit 1
		fi
	fi

	if [[ -r "${DEPRECATED_KEYS}" ]]; then
		msg "$(gettext "Verifying deprecated keys file signature...")"
		if ! ${GPG_PACMAN} --quiet --batch --verify "${DEPRECATED_KEYS}.sig" 1>/dev/null; then
			error "$(gettext "The signature of file %s is not valid.")" "${DEPRECATED_KEYS}"
			exit 1
		fi
	fi

	if [[ -r "${REMOVED_KEYS}" ]]; then
		msg "$(gettext "Verifying deleted keys file signature...")"
		if ! ${GPG_PACMAN} --quiet --batch --verify "${REMOVED_KEYS}.sig"; then
			error "$(gettext "The signature of file %s is not valid.")" "${REMOVED_KEYS}"
			exit 1
		fi
	fi

	# Read the key ids to an array. The conversion from whatever is inside the file
	# to key ids is important, because key ids are the only guarantee of identification
	# for the keys.
	local -A removed_ids
	if [[ -r "${REMOVED_KEYS}" ]]; then
		while read key; do
			local key_values name
			key_values=$(${GPG_PACMAN} --quiet --with-colons --list-key "${key}" | grep ^pub | cut -d: -f5,10 --output-delimiter=' ')
			if [[ -n $key_values ]]; then
				# The first word is the key_id
				key_id=${key_values%% *}
				# the rest if the name of the owner
				name=${key_values#* }
				if [[ -n ${key_id} ]]; then
					# Mark this key to be deleted
					removed_ids[$key_id]="$name"
				fi
			fi
		done < "${REMOVED_KEYS}"
	fi

	# List of keys that must be kept installed, even if in the list of keys to be removed
	local HOLD_KEYS=$(find_config "HoldKeys")

	# Remove the keys that must be kept from the set of keys that should be removed
	if [[ -n ${HOLD_KEYS} ]]; then
		for key in ${HOLD_KEYS}; do
			key_id=$(${GPG_PACMAN} --quiet --with-colons --list-key "${key}" | grep ^pub | cut -d: -f5)
			if [[ -n "${removed_ids[$key_id]}" ]]; then
				unset removed_ids[$key_id]
			fi
		done
	fi

	# Add keys from the current set of keys from pacman-keyring package. The web of trust will
	# be updated automatically.
	if [[ -r "${ADDED_KEYS}" ]]; then
		msg "$(gettext "Appending official keys...")"
		local add_keys=$(${GPG_NOKEYRING} --keyring "${ADDED_KEYS}" --with-colons --list-keys | grep ^pub | cut -d: -f5)
		for key_id in ${add_keys}; do
			# There is no point in adding a key that will be deleted right after
			if [[ -z "${removed_ids[$key_id]}" ]]; then
				${GPG_NOKEYRING} --keyring "${ADDED_KEYS}" --export "${key_id}" | ${GPG_PACMAN} --import
			fi
		done
	fi

	if [[ -r "${DEPRECATED_KEYS}" ]]; then
		msg "$(gettext "Appending deprecated keys...")"
		local add_keys=$(${GPG_NOKEYRING} --keyring "${DEPRECATED_KEYS}" --with-colons --list-keys | grep ^pub | cut -d: -f5)
		for key_id in ${add_keys}; do
			# There is no point in adding a key that will be deleted right after
			if [[ -z "${removed_ids[$key_id]}" ]]; then
				${GPG_NOKEYRING} --keyring "${DEPRECATED_KEYS}" --export "${key_id}" | ${GPG_PACMAN} --import
			fi
		done
	fi

	# Remove the keys not marked to keep
	if (( ${#removed_ids[@]} > 0 )); then
		msg "$(gettext "Removing deleted keys from keyring...")"
		for key_id in "${!removed_ids[@]}"; do
			echo "  removing key $key_id - ${removed_ids[$key_id]}"
			${GPG_PACMAN} --quiet --batch --yes --delete-key "${key_id}"
		done
	fi

	# Update trustdb, just to be sure
	msg "$(gettext "Updating trust database...")"
	${GPG_PACMAN} --batch --check-trustdb
}

# PROGRAM START
if ! type gettext &>/dev/null; then
	gettext() {
		echo "$@"
	}
fi

if [[ $1 != "--version" && $1 != "-V" && $1 != "--help" && $1 != "-h" && $1 != "" ]]; then
	if type -p gpg >/dev/null 2>&1 = 1; then
		error "$(gettext "gnupg does not seem to be installed.")"
		msg2 "$(gettext "pacman-key requires gnupg for most operations.")"
		exit 1
	elif (( EUID != 0 )); then
		error "$(gettext "pacman-key needs to be run as root.")"
		exit 1
	fi
fi

# Parse global options
CONFIG="@sysconfdir@/pacman.conf"
PACMAN_KEYRING_DIR="@sysconfdir@/pacman.d/gnupg"
while [[ $1 =~ ^--(config|gpgdir)$ ]]; do
	case "$1" in
		--config) shift; CONFIG="$1" ;;
		--gpgdir) shift; PACMAN_KEYRING_DIR="$1" ;;
	esac
	shift
done

if [[ ! -r "${CONFIG}" ]]; then
	error "$(gettext "%s not found.")" "$CONFIG"
	exit 1
fi

# Read GPGDIR from $CONFIG.
# The pattern is: any spaces or tabs, GPGDir, any spaces or tabs, equal sign
# and the rest of the line. The string is splitted after the first occurrence of =
if [[ GPGDIR=$(find_config "GPGDir") == 0 ]]; then
	PACMAN_KEYRING_DIR="${GPGDIR}"
fi
GPG_PACMAN="gpg --homedir ${PACMAN_KEYRING_DIR}"

# Parse and execute command
command="$1"
if [[ -z "${command}" ]]; then
	usage
	exit 1
fi
shift

case "${command}" in
	-a|--add)
		# If there is no extra parameter, gpg will read stdin
		${GPG_PACMAN} --quiet --batch --import "$@"
		;;
	-d|--del)
		if (( $# == 0 )); then
			error "$(gettext "You need to specify at least one key identifier")"
			exit 1
		fi
		${GPG_PACMAN} --quiet --batch --delete-key --yes "$@"
		;;
	-u|--updatedb)
		${GPG_PACMAN} --batch --check-trustdb
		;;
	--reload)
		reload_keyring
		;;
	-l|--list)
		${GPG_PACMAN} --batch --list-sigs "$@"
		;;
	-f|--finger)
		${GPG_PACMAN} --batch --fingerprint "$@"
		;;
	-e|--export)
		${GPG_PACMAN} --armor --export "$@"
		;;
	-r|--receive)
		if (( $# < 2 )); then
			error "$(gettext "You need to specify the keyserver and at least one key identifier")"
			exit 1
		fi
		keyserver="$1"
		shift
		${GPG_PACMAN} --keyserver "${keyserver}" --recv-keys "$@"
		;;
	-t|--trust)
		if (( $# == 0 )); then
			error "$(gettext "You need to specify at least one key identifier")"
			exit 1
		fi
		while (( $# > 0 )); do
			# Verify if the key exists in pacman's keyring
			if ${GPG_PACMAN} --list-keys "$1" > /dev/null 2>&1; then
				${GPG_PACMAN} --edit-key "$1"
			else
				error "$(gettext "The key identified by %s doesn't exist")" "$1"
				exit 1
			fi
			shift
		done
		;;
	--adv)
		msg "$(gettext "Executing: %s ")$*" "${GPG_PACMAN}"
		${GPG_PACMAN} "$@" || ret=$?
		exit $ret
		;;
	-h|--help)
		usage; exit 0 ;;
	-V|--version)
		version; exit 0 ;;
	*)
		usage; exit 1 ;;
esac