#!/bin/bash
#
# Keyringer key management system.
#
# Copyright (C) 2010 Silvio Rhatto - rhatto at riseup.net
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or 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 Affero General Public License for more details.
# 
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

function keyringer_init {
  BASEDIR="$3"
  URL="$4"
  RECIPIENTS="$BASEDIR/config/recipients"
  OPTIONS="$BASEDIR/config/options"

  # We are initializing, so avoid some checks
  export KEYRINGER_CHECK_VERSION="false"
  export KEYRINGER_CHECK_RECIPIENTS="false"

  # Parse
  if [ -z "$BASEDIR" ]; then
    echo "Usage: $BASENAME <keyring> init <path> [url]"
    exit 1
  elif grep -q -e "^$KEYRING=" $CONFIG; then
    echo "Keyring $KEYRING already defined"
    exit 1
  fi

  # Setup
  if [ ! -z "$URL" ]; then
    git clone "$URL" "$BASEDIR"
    if [ "$?" != "0" ]; then
      echo "Error cloning remote $URL"
      exit 1
    fi
  else
    if [ -e "$BASEDIR" ]; then
      if [ ! -d "$BASEDIR/keys" ] || [ ! -e "$RECIPIENTS" ]; then
        echo "Invalid keyring $BASEDIR: incomplete installation"

        # A common mistake
        if [ -d "$BASEDIR/../keys" ]; then
          echo "You might try `cd $BASEDIR/.. && pwd` instead"
        fi

        exit 1
      fi
    else
      # Setup folders
      mkdir -p "$BASEDIR/"{config,keys}

      # Setup recipients
      keyringer_create_new_recipients "$RECIPIENTS/default"

      # Setup options
      touch "$OPTIONS"

      # Setup README
      echo "Keyring repository powered by http://git.sarava.org/?p=keyringer.git;a=summary" > "$BASEDIR/README"
      echo "" >> "$BASEDIR/README"
    fi

    # Secure
    chmod 700 "$RECIPIENTS"
  fi

  # Reparse basedir to force absolute folder
  BASEDIR="`cd $BASEDIR && pwd`"

  # Add entry
  chmod 700 "$BASEDIR"
  echo "$KEYRING=\"$BASEDIR\"" >> "$CONFIG"

  # Init
  if ! keyringer_is_git "$BASEDIR"; then
    keyringer_exec git "$BASEDIR" init
    keyringer_exec git "$BASEDIR" add .
    keyringer_exec git "$BASEDIR" commit -m Importing
  fi
}

function keyringer_dispatch {
  BASEDIR="`keyringer_config $KEYRING`"

  # Dispatch
  if [ ! -z "$BASEDIR" ]; then
    shift 2
    keyringer_exec "$ACTION" "$BASEDIR" $*
    exit $?
  else
    echo "No keydir configured for $KEYRING"
    exit 1
  fi
}

# Config
NAME="keyringer"
KEYRINGER_VERSION="0.1"
CONFIG="$HOME/.$NAME/config"
BASENAME="`basename $0`"
KEYRING="$1"
ACTION="$2"

# Turn off pathname expansion so expansion can work properly
set -f

# Export preferences and version for other scripts
export PREFERENCES="`dirname $CONFIG`/$KEYRING"
export KEYRINGER_VERSION

# Set functions location
if [ -e "`dirname $(readlink -f $0)`/lib/$NAME/functions" ]; then
  # Development or local installation layout
  LIB="`dirname $(readlink -f $0)`/lib/$NAME/functions"
else
  # System installation layout
  LIB="`dirname $(readlink -f $0)`/../lib/$NAME/functions"
fi

# Set actions location
if [ -e "`dirname $(readlink -f $0)`/share/$NAME" ]; then
  # Development or local installation layout
  ACTIONS="`dirname $(readlink -f $0)`/share/$NAME"
else
  # System installation layout
  ACTIONS="`dirname $(readlink -f $0)`/../share/$NAME"
fi

# Load functions
source "$LIB" || exit 1

# Setup main configuration and load preferences
keyringer_config_load

if [ -z "$ACTION" ]; then
  keyringer_usage
  exit 1
fi

if [ "$ACTION" == "init" ]; then
  keyringer_init $*
elif keyringer_has_action "$ACTION"; then
  keyringer_dispatch $*
else
  echo "No such action $ACTION"
  exit 1
fi