#! /bin/sh
###
### Generate a user key
###
### (c) 2011 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This file is part of the distorted.org.uk key management suite.
###
### distorted-keys 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.
###
### distorted-keys 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 distorted-keys; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

set -e
case "${KEYSLIB+t}" in t) ;; *) echo >&2 "$0: KEYSLIB unset"; exit 1 ;; esac
. "$KEYSLIB"/keyfunc.sh

defhelp <<HELP
[-f] KEY PROFILE [ARGUMENTS ...]
Generate a named KEY, according to the PROFILE.

The ARGUMENTS are passed to the key-type handler selected by the profile.

Options:
  -f		Force overwriting an existing key.
HELP

genhook_recov () {
  base=$1 nub=$2
  for recov in $kprop_recovery; do
    (stash $recov $kowner/$klabel <"$nub")
  done
}

## Parse command-line arguments.
forcep=nil
while getopts "f" opt; do
  case "$opt" in
    f) forcep=t ;;
    *) usage_err ;;
  esac
done
shift $(( $OPTIND - 1 ))
case $# in 0 | 1) usage_err ;; esac
key=$1 profile=$2; shift 2

## Check the key name carefully.  This is where we actually create files,
## so it's reallly important to make sure that we don't make any stupid
## mistakes.
mktmp
parse_keylabel "$key"
case "$kowner" in
  "$USERV_USER") ;;
  *) echo >&2 "$quis: invalid owner \`$kowner' for key"; exit 1 ;;
esac
case $forcep in
  nil)
    if [ -d $kdir ]; then
      echo >&2 "$quis: key \`$key' already exists"
      exit 1
    fi
    ;;
esac

## Check the profile name.  We shouldn't allow users to refer to each
## other's profiles.
case "$profile" in
  :*)
    label=${profile#:}
    ;;
  *:*)
    powner=${profile%%:*} label=${profile#*:}
    case "$powner" in
      "$USERV_USER") ;;
      *) echo >&2 "$quis: invalid owner \`$powner' for profile"; exit 1 ;;
    esac
    ;;
  *)
    label=$profile
    ;;
esac
checkword "profile label" "$label"
read_profile $USERV_USER $profile

## Generate the key.
c_genkey $profile $kdir $knub genhook_recov "$@"

###----- That's all, folks --------------------------------------------------