#!/bin/sh

set -e

# Source debconf library
. /usr/share/debconf/confmodule

# This conf script is capable of backing up
db_version 2.0
db_capb backup

# Get user config

FRESHCLAMCONF='/etc/clamav/freshclam.conf'

if [ -n "$http_proxy" ];then 
  db_set clamav-freshclam/http_proxy "$http_proxy" || true
fi

to_lower()
{
  word="$1"
  lcword=$(echo "$word" | tr A-Z a-z)
  echo "$lcword"
}

is_true()
{
  var="$1"
  lcvar=$(to_lower "$var")
  [ 'true' = "$lcvar" ] || [ 'yes' = "$lcvar" ] || [ 1 = "$lcvar" ]
  return $?
}

ucf_cleanup()
{
  # This only does something if I've fucked up before
  # Not entirely impossible :(

  configfile=$1

  if [ `grep "$configfile" /var/lib/ucf/hashfile | wc -l` -gt 1 ]; then
    grep -v "$configfile" /var/lib/ucf/hashfile > /var/lib/ucf/hashfile.tmp
    grep "$configfile" /var/lib/ucf/hashfile | tail -n 1  >> /var/lib/ucf/hashfile.tmp
    mv /var/lib/ucf/hashfile.tmp /var/lib/ucf/hashfile
  fi
}

add_to_ucf()
{
  configfile=$1
  ucffile=$2

  if ! grep -q "$configfile" /var/lib/ucf/hashfile; then
    md5sum $configfile >> /var/lib/ucf/hashfile
    cp $configfile $ucffile
  fi
}

ucf_upgrade_check()
{
  configfile=$1
  sourcefile=$2
  ucffile=$3

  if [ -f "$configfile" ]; then
    add_to_ucf $configfile $ucffile
    ucf --three-way --debconf-ok "$sourcefile" "$configfile"
  else
    [ -d /var/lib/ucf/cache ] || mkdir -p /var/lib/ucf/cache
    cp $sourcefile $configfile
    add_to_ucf $configfile $ucffile
  fi
}

slurp_config()
{
  CLAMAVCONF="$1"
  
  if [ -e "$CLAMAVCONF" ]; then
    for variable in `egrep -v '^[[:space:]]*(#|$)' "$CLAMAVCONF" | awk '{print $1}'`; do
      if [ "$variable" = 'DatabaseMirror' ]; then
        if [ -z "$DatabaseMirror" ]; then
          for i in `grep ^$variable $CLAMAVCONF | awk '{print $2}'`; do
            value="$i $value"
          done
        else
          continue
        fi
      elif [ "$variable" = 'IncludePUA' ]; then
        if [ -z "$IncludePUA" ]; then
          for i in `grep ^$variable $CLAMAVCONF | awk '{print $2}'`; do
            value="$i $value"
          done
        else
          continue
        fi
      elif [ "$variable" = 'ExcludePUA' ]; then
        if [ -z "$ExcludePUA" ]; then
          for i in `grep ^$variable $CLAMAVCONF | awk '{print $2}'`; do
            value="$i $value"
          done
        else
          continue
        fi
      elif [ "$variable" = 'VirusEvent' ] || [ "$variable" = 'OnUpdateExecute' ] || [ "$variable" = 'OnErrorExecute' ]; then
        value=`grep ^$variable $CLAMAVCONF | head -n1 | sed -e s/$variable\ //`
      else
        value=`grep ^$variable $CLAMAVCONF | head -n1 | awk '{print $2}'`
      fi
      if [ -z "$value" ]; then 
        export "$variable"="true"
      elif [ "$value" != "$variable" ]; then
        export "$variable"="$value"
      else
        export "$variable"="true"
      fi
      unset value
    done
  fi
}

make_dir()
{
  DIR=$1
  if [ -d "$DIR" ]; then
    return 0;
  fi
  [ -n "$User" ] || User=clamav
  mkdir -p -m 0755 "$DIR"
  chown "$User:$User" "$DIR"
}



slurp_config "$FRESHCLAMCONF"

# Set debconf values from config file 

[ -f /var/lib/clamav/interface ] && Interface=`cat /var/lib/clamav/interface`
if [ -n "$Interface" ]; then
  db_set clamav-freshclam/autoupdate_freshclam ifup.d || true
fi
if [ -n "$Interface" ]; then
  db_set clamav-freshclam/internet_interface "$Interface" || true
fi
if [ -n "$DatabaseMirror" ]; then
  if [ -e /usr/share/doc/clamav-freshclam/mirror-list.gz ]; then
    if zgrep -q "$DatabaseMirror" /usr/share/doc/clamav-freshclam/mirror-list.gz;then
      db_set clamav-freshclam/local_mirror `zgrep "$DatabaseMirror" /usr/share/doc/clamav-freshclam/mirror-list.gz` || true
    else
      db_set clamav-freshclam/local_mirror "$DatabaseMirror" || true
    fi
  fi
fi
if [ -n "$HTTPProxyServer" ]; then
  db_set clamav-freshclam/http_proxy "http://$HTTPProxyServer:$HTTPProxyPort/" || true
fi
if [ -n "$HTTPProxyUsername" ]; then
  db_set clamav-freshclam/proxy_user "$HTTPProxyUsername:$HTTPProxyPassword" || true
fi
if [ -n "$Checks" ]; then
  db_set clamav-freshclam/update_interval "$Checks" || true
fi
if [ -n "$NotifyClamd" ]; then
  db_set clamav-freshclam/NotifyClamd "$NotifyClamd" || true
fi

# States

StateInit()
{
  STATE="autoupdate_freshclam"
}

Stateautoupdate_freshclam()
{
  db_input medium clamav-freshclam/autoupdate_freshclam || true
  if db_go; then
    db_metaget clamav-freshclam/autoupdate_freshclam value || true
    if [ "$RET" = "ifup.d" ]; then
      STATE="internet_interface"
    else
      STATE="local_mirror"
    fi
  else
    STATE="End"
  fi
}

Stateinternet_interface()
{
  db_input high clamav-freshclam/internet_interface || true
  if db_go; then
    STATE="local_mirror"
  else
    STATE="autoupdate_freshclam"
  fi
}

Statelocal_mirror()
{
  db_input medium clamav-freshclam/local_mirror || true
  if ! db_go; then
    STATE="autoupdate_freshclam"
  else
    db_metaget clamav-freshclam/local_mirror value || true
    if [ -z "$RET" ]; then
      db_set clamav-freshclam/local_mirror 'db.local.clamav.net' || true
    else
      STATE="http_proxy"
    fi
  fi
}

Statehttp_proxy()
{
  db_input medium clamav-freshclam/http_proxy || true
  if ! db_go; then
    STATE="local_mirror"
  else
    db_metaget clamav-freshclam/http_proxy value || true
    if [ -z "$RET" ]; then
      STATE="update_interval"
    else
      STATE="proxy_user"
    fi
  fi
}

Stateproxy_user()
{
  db_input medium clamav-freshclam/proxy_user || true
  if ! db_go; then
    STATE="http_proxy"
  else
    STATE="update_interval"
  fi
}

Stateupdate_interval()
{
  db_input low clamav-freshclam/update_interval || true
  if ! db_go; then
    STATE="http_proxy"
  else
    db_metaget clamav-freshclam/update_interval value || true
    if [ -z "$RET" ]; then
      db_set clamav-freshclam/update_interval 12 || true
    fi
    STATE="notify_daemon"
  fi
}

Statenotify_daemon()
{
  db_input medium clamav-freshclam/NotifyClamd || true
  if ! db_go; then
    STATE="update_interval"
  else
    STATE="End"
  fi
}

# This is the statemachine that controls execution. All the 'real' work is 
# performed by subfunctions above. 

STATE="Init"
while [ "$STATE" != "End" ]; do
  case "$STATE" in
    Init)
    StateInit
    ;;
    autoupdate_freshclam)
    Stateautoupdate_freshclam
    ;;
    local_mirror)
    Statelocal_mirror
    ;;
    http_proxy)
    Statehttp_proxy
    ;;
    proxy_user)
    Stateproxy_user
    ;;
    internet_interface)
    Stateinternet_interface
    ;;
    update_interval)
    Stateupdate_interval
    ;;
    notify_daemon)
    Statenotify_daemon
    ;;
  esac
done
db_stop || true
exit 0