#!/bin/bash
# I, Ian Kelling, follow the GNU license recommendations at
# https://www.gnu.org/licenses/license-recommendations.en.html. They
# recommend that small programs, < 300 lines, be licensed under the
# Apache License 2.0. This file contains or is part of one or more small
# programs. If a small program grows beyond 300 lines, I plan to switch
# its license to GPL.

# Copyright 2024 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.


if [[ -s ~/.bashrc ]]; then . ~/.bashrc; fi


# 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.

# Their server has failed a few times on me, so do some retrying.
for (( i=0; i <= 6 ; i++ )); do
  c=$(curl -s https://dist.torproject.org/torbrowser/) && break
  sleep 15
done
if [[ ! $c ]]; then
  echo "$0: error: failed to curl tor directory listing" >&2
  exit 1
fi
vers=($(printf "%s\n" "$c" | 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

dl() {
  f=tor-browser-linux64-${ver}_ALL.tar.xz
  if [[ -e $f ]]; then
    timestamp=$(stat -c %Y $f)
  else
    timestamp=0
  fi
  ret=0
  echo wget -nv -N https://www.torproject.org/dist/torbrowser/$ver/$f
  wget -nv -N https://www.torproject.org/dist/torbrowser/$ver/$f || ret=$?
}

# some releases are for specific non-gnu oses
for ((i=0; i<${#vers[@]}; i++)); do
  ver=${vers[i]}
  dl
  # 8 is return code for 404.
  if [[ $ret != 8 ]]; then
    break
  fi
done

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



  ## begin handlers customization
  ## the default file doesn't exist anymore. i customized it to open magnet links,
  ## it might work with removing the default stuff and keeping the magnet link part,
  ## but I'd have to test and I don't care that much.
  # dest=/a/opt/tor-browser/Browser/TorBrowser/Data/Browser/profile.default/handlers.json
  # orig=/p/c/tor-handlers-orig.json
  # src=/p/c/tor-handlers.json
  # if ! diff -q $src $dest &>/dev/null; then
  #   echo "Error: handlers file changed. adjust based on upstream"
  #   exit 1
  # fi
  # cp $src $dest
  ## end handlers customization

  cp /p/c/tor-user.js /a/opt/tor-browser/Browser/TorBrowser/Data/Browser/profile.default/user.js

fi

for x in tor-*.tar.xz; do
  # cleanup old tarballs
  [[ -e $x ]] || break
  [[ $x != $f ]] || continue
  command rm -f $x
done