#!/bin/bash -l
# Copyright (C) 2016 Ian Kelling

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?"' ERR


# stable version is shown on:
# https://dist.torproject.org/torbrowser/
# except sometimes you get a new stable before it's
# officially released, which is ok by me. for example,
# right now, it has 6.5.2, but stable is 6.5.1.
# we exclude verions with letters, as that seems to
# be a relatively reliable indication of alpha/beta releases.

vers=($(curl -s https://dist.torproject.org/torbrowser/ \
          | sed -rn 's#.*href="([0-9]+\.[0-9]+[.0-9]*)/.*#\1#p' \
          | sort -Vr))



# by default it has perms for just 1 non-root user, which is ok for now.

cd /a/opt

ver=${vers[0]}
dl() {
  f=tor-browser-linux64-${ver}_en-US.tar.xz
  if [[ -e $f ]]; then
    timestamp=$(stat -c %Y $f)
  else
    timestamp=0
  fi
  echo wget -nv -N https://www.torproject.org/dist/torbrowser/$ver/$f
  wget -nv -N https://www.torproject.org/dist/torbrowser/$ver/$f || ret=$?
}
dl
# 8 is return code for 404. for a new release, they might not have released to linux yet.
if [[ $ret == 8 ]]; then
  ver=${vers[1]}
  dl
fi

new_timestamp=$(stat -c %Y $f)
if [[ $timestamp != $new_timestamp || ! -e /a/opt/tor-browser_en-US/Browser/start-tor-browser ]]; then
  # not already installed
  rm -rf tor-browser_en-US
  ex $f
fi

for x in tor-*.tar.xz; do
  # cleanup old tarballs
  [[ -e $x ]] || break
  [[ $x != $f ]] || continue
  command rm -f $x
done
s lnf /a/opt/tor-browser_en-US/Browser/start-tor-browser /usr/local/bin