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#!@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 "$(gettext "Options must be placed before commands. The available options are:")"
        echo "$(gettext " --config    - set an alternative configuration file to use. ")"
        printf "$(gettext "               Default is %s")\n" "@sysconfdir@/pacman.conf"
        echo "$(gettext " --gpgdir    - set an alternative home directory for gnupg. ")"
        printf "$(gettext "               Default is set in %s")\n" "@sysconfdir@/pacman.conf"
        echo
        echo "$(gettext "The available commands are:")"
        echo "$(gettext "  pacman-key -a | --add [<file>] ...                - add the key contained ")"
        echo "$(gettext "                                                      in <file> (empty for stdin)")"
        echo "$(gettext "  pacman-key -d | --del <keyid> ...                 - remove the key <keyid>")"
        echo "$(gettext "  pacman-key -e | --export <keyid> ...              - output the key <keyid>")"
        echo "$(gettext "  pacman-key -r | --receive <keyserver> <keyid> ... - fetch the keyids from")"
        echo "$(gettext "                                                      the specified keyserver URL")"
        echo "$(gettext "  pacman-key -t | --trust <keyid> ...               - set the trust level of the given key")"
        echo "$(gettext "  pacman-key -u | --updatedb                        - update the trustdb of pacman")"
        echo "$(gettext "  pacman-key --reload                               - reloads the keys from the keyring package")"
        echo "$(gettext "  pacman-key -l | --list                            - list keys")"
        echo "$(gettext "  pacman-key -f | --finger [<keyid]> ...            - list fingerprint for specified keyids (or for all, if none is specified)")"
        echo "$(gettext "  pacman-key --adv <params>                         - use pacman's keyring as target for advanced commands")"
        echo "$(gettext "  pacman-key -h | --help                            - displays this message")"
        echo "$(gettext "  pacman-key -v | --version                         - displays the current version")"
}

version() {
        printf "pacman-key (pacman) %s\n" "${myver}"
        printf "$(gettext "\
Copyright (c) 2010 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")"
}

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}"

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

        # Read-only list of keys removed from the keyring.
        local REMOVED_KEYS="${PACMAN_SHARE_DIR}/removedkeys"

        # 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 "Verifying official keys file signature...")"
                if ! ${GPG_PACMAN} --quiet --verify "${ADDED_KEYS}.sig" 1>/dev/null; then
                        error "$(gettext "The signature of file %s is not valid.")" "${ADDED_KEYS}"
                        exit 1
                fi

                msg "$(gettext "Appending official keys...")"
                local add_keys=$(${GPG_NOKEYRING} --keyring "${ADDED_KEYS}" --with-colons --list-keys | grep ^pub | cut -d: -f5)
                for key in ${add_keys}; do
                        msg "$(gettext "  key id: %s")" "$key"
                        ${GPG_NOKEYRING} --keyring "${ADDED_KEYS}" --export "${key}" | ${GPG_PACMAN} --import
                done
        fi

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

                msg "$(gettext "Removing deleted keys from keyring...")"
                cat "${REMOVED_KEYS}" | while read key; do
                        msg "$(gettext "  key id: %s")" "$key"
                        ${GPG_PACMAN} --quiet --batch --yes --delete-key "${key}"
                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" && $1 != "-h" ]]; then
        if type -p gpg >/dev/null 2>&1 = 1; then
                error "$(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 "It is not possible to read %s")" "${CONFIG}"
        exit 1
fi

# Read GPGDIR from $CONFIG.
# The pattern is: any spaces or tabs, GPGDir, any spaces or tabs, equal sign
# and the rest of the line. The string is splitted after the first occurrence of =
if [[ GPGDIR=$(grep -e '^[[:blank:]]*GPGDir[[:blank:]]*=.*' "$CONFIG") == 0 ]]; then
  GPGDIR=${GPGDIR#*=}
        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 (( $# == 0 )); then
                        error "$(gettext "You need to specify at least one key identifier")"
                        usage
                        exit 1
                fi
                while (( $# > 0 )); do
                        ${GPG_PACMAN} --quiet --batch --import "$1"
                        shift
                done
                ;;
        -d|--del)
                if (( $# == 0 )); then
                        error "$(gettext "You need to specify at least one key identifier")"
                        usage
                        exit 1
                fi
                while (( $# > 0 )); do
                        ${GPG_PACMAN} --quiet --batch --delete-key --yes "$1"
                        shift
                done
                ;;
        -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)
                if (( $# == 0 )); then
                        ${GPG_PACMAN} --armor --export
                else
                        while (( $# > 0 )); do
                                ${GPG_PACMAN} --armor --export "$1"
                                shift
                        done
                fi
                ;;
        -r|--receive)
                if (( $# < 2 )); then
                        error "$(gettext "You need to specify the keyserver and at least one key identifier")"
                        usage
                        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")"
                        usage
                        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
                ;;
        --help)
                usage
                ;;
        --version)
                version
                exit 0
                ;;
        *)
                usage
                exit 1
                ;;
esac