#!/usr/bin/env bash

## ghacks-user.js updater for macOS and Linux

## version: 2.3
## Author: Pat Johnson (@overdodactyl)
## Additional contributors: @earthlng, @ema-pe, @claustromaniac

## DON'T GO HIGHER THAN VERSION x.9 !! ( because of ASCII comparison in update_updater() )

readonly CURRDIR=$(pwd)

sfp=$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null || greadlink -f "${BASH_SOURCE[0]}" 2>/dev/null)
if [ -z "$sfp" ]; then sfp=${BASH_SOURCE[0]}; fi
readonly SCRIPT_DIR=$(dirname "${sfp}")


#########################
#    Base variables     #
#########################

# Colors used for printing
RED='\033[0;31m'
BLUE='\033[0;34m'
BBLUE='\033[1;34m'
GREEN='\033[0;32m'
ORANGE='\033[0;33m'
CYAN='\033[0;36m'
NC='\033[0m' # No Color

# Argument defaults
UPDATE='check'
CONFIRM='yes'
OVERRIDE='user-overrides.js'
BACKUP='multiple'
COMPARE=false
SKIPOVERRIDE=false
VIEW=false
PROFILE_PATH=false

# Download method priority: curl -> wget
DOWNLOAD_METHOD=''
if [[ $(command -v 'curl') ]]; then
  DOWNLOAD_METHOD='curl'
elif [[ $(command -v 'wget') ]]; then
  DOWNLOAD_METHOD='wget'
else
  echo -e "${RED}This script requires curl or wget.\nProcess aborted${NC}"
  exit 0
fi


show_banner () {
  echo -e "${BBLUE}\n"
  echo '                ############################################################################'
  echo '                ####                                                                    ####'
  echo '                ####                           ghacks user.js                           ####'
  echo '                ####       Hardening the Privacy and Security Settings of Firefox       ####'
  echo '                ####           Maintained by @Thorin-Oakenpants and @earthlng           ####'
  echo '                ####            Updater for macOS and Linux by @overdodactyl            ####'
  echo '                ####                                                                    ####'
  echo '                ############################################################################'
  echo -e "${NC}\n"
  echo -e "Documentation for this script is available here: ${CYAN}https://github.com/ghacksuserjs/ghacks-user.js/wiki/3.3-Updater-Scripts${NC}\n"
}

#########################
#      Arguments        #
#########################

usage() {
  echo -e "${BLUE}\nUsage: $0 [-h] [-p PROFILE] [-u] [-d] [-s] [-n] [-b] [-c] [-v] [-r] [-o OVERRIDE]\n${NC}" 1>&2  # Echo usage string to standard error
  echo 'Optional Arguments:'
  echo -e "\t-h,\t\t Show this help message and exit."
  echo -e "\t-p PROFILE,\t Path to your Firefox profile (if different than the dir of this script)"
  echo -e "\t\t\t IMPORTANT: if the path include spaces, wrap the entire argument in quotes."
  echo -e "\t-l, \t\t Choose your Firefox profile from a list"
  echo -e "\t-u,\t\t Update updater.sh and execute silently.  Do not seek confirmation."
  echo -e "\t-d,\t\t Do not look for updates to updater.sh."
  echo -e "\t-s,\t\t Silently update user.js.  Do not seek confirmation."
  echo -e "\t-b,\t\t Only keep one backup of each file."
  echo -e "\t-c,\t\t Create a diff file comparing old and new user.js within userjs_diffs. "
  echo -e "\t-o OVERRIDE,\t Filename or path to overrides file (if different than user-overrides.js)."
  echo -e "\t\t\t If used with -p, paths should be relative to PROFILE or absolute paths"
  echo -e "\t\t\t If given a directory, all files inside will be appended recursively."
  echo -e "\t\t\t You can pass multiple files or directories by passing a comma separated list."
  echo -e "\t\t\t\t Note: If a directory is given, only files inside ending in the extension .js are appended"
  echo -e "\t\t\t\t IMPORTANT: do not add spaces between files/paths.  Ex: -o file1.js,file2.js,dir1"
  echo -e "\t\t\t\t IMPORTANT: if any files/paths include spaces, wrap the entire argument in quotes."
  echo -e "\t\t\t\t\t Ex: -o \"override folder\" "
  echo -e "\t-n,\t\t Do not append any overrides, even if user-overrides.js exists."
  echo -e "\t-v,\t\t Open the resulting user.js file."
  echo -e "\t-r,\t\t Only download user.js to a temporary file and open it."
  echo -e
  echo 'Deprecated Arguments (they still work for now):'
  echo -e "\t-donotupdate,\t Use instead -d"
  echo -e "\t-update,\t Use instead -u"
  echo -e
  exit 1
}

legacy_argument () {
  echo -e "${ORANGE}\nWarning: command line arguments have changed."
  echo -e "$1 has been deprecated and may not work in the future.\n"
  echo -e "Please view the new options using the -h argument.${NC}"
}

#########################
#     File Handling     #
#########################

# Download files
download_file () {
  declare -r url=$1
  declare -r tf=$(mktemp)
  local dlcmd=''

  if [ $DOWNLOAD_METHOD = 'curl' ]; then
    dlcmd="curl -o $tf"
  else
    dlcmd="wget -O $tf"
  fi

  $dlcmd "${url}" &>/dev/null && echo "$tf" || echo '' # return the temp-filename (or empty string on error)
}

open_file () { #expects one argument: file_path
  if [ "$(uname)" == 'Darwin' ]; then
    open "$1"
  elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
    xdg-open "$1"
  else
    echo -e "${RED}Error: Sorry, opening files is not supported for your OS.${NC}"
  fi
}

readIniFile () { # expects one argument: absolute path of profiles.ini
  declare -r inifile="$1"
  declare -r tfile=$(mktemp)

  if [ $(grep '^\[Profile' "$inifile" | wc -l) == "1" ]; then ### only 1 profile found
    grep '^\[Profile' -A 4 "$inifile" | grep -v '^\[Profile' > $tfile
  else
    grep -E -v '^\[General\]|^StartWithLastProfile=|^IsRelative=' "$inifile"
    echo ''
    read -p 'Select the profile number ( 0 for Profile0, 1 for Profile1, etc ) : ' -r
    echo -e "\n"
    if [[ $REPLY =~ ^(0|[1-9][0-9]*)$ ]]; then
      grep '^\[Profile'${REPLY} -A 4 "$inifile" | grep -v '^\[Profile'${REPLY} > $tfile
      if [[ "$?" != "0" ]]; then
        echo "Profile${REPLY} does not exist!" && exit 1
      fi
    else
      echo "Invalid selection!" && exit 1
    fi
  fi

  declare -r profpath=$(grep '^Path=' $tfile)
  declare -r pathisrel=$(grep '^IsRelative=' $tfile)

  rm "$tfile"

  # update global variable
  if [[ ${pathisrel#*=} == "1" ]]; then
    PROFILE_PATH="$(dirname "$inifile")/${profpath#*=}"
  else
    PROFILE_PATH="${profpath#*=}"
  fi
}

getProfilePath () {
  declare -r f1=~/Library/Application\ Support/Firefox/profiles.ini
  declare -r f2=~/.mozilla/firefox/profiles.ini

  if [ "$PROFILE_PATH" = false ]; then
    PROFILE_PATH="$SCRIPT_DIR"
  elif [ "$PROFILE_PATH" = 'list' ]; then
    local ini=''
    if [[ -f "$f1" ]]; then
      ini="$f1"
    elif [[ -f "$f2" ]]; then
      ini="$f2"
    else
      echo -e "${RED}Error: Sorry, -l is not supported for your OS${NC}"
      exit 1
    fi
    readIniFile "$ini" # updates PROFILE_PATH or exits on error
  #else
    # PROFILE_PATH already set by user with -p
  fi
}

#########################
#   Update updater.sh   #
#########################

# Returns the version number of a updater.sh file
get_updater_version () {
  echo $(sed -n '5 s/.*[[:blank:]]\([[:digit:]]*\.[[:digit:]]*\)/\1/p' "$1")
}

# Update updater.sh
# Default: Check for update, if available, ask user if they want to execute it
# Args:
#   -donotupdate: New version will not be looked for and update will not occur
#   -update: Check for update, if available, execute without asking
update_updater () {
  if [ $UPDATE = 'no' ]; then
    return 0 # User signified not to check for updates
  fi

  declare -r tmpfile=$(download_file 'https://raw.githubusercontent.com/ghacksuserjs/ghacks-user.js/master/updater.sh')

  if [[ $(get_updater_version "${SCRIPT_DIR}/updater.sh") < $(get_updater_version "${tmpfile}") ]]; then
    if [ $UPDATE = 'check' ]; then
      echo -e "There is a newer version of updater.sh available. ${RED}Update and execute Y/N?${NC}"
      read -p "" -n 1 -r
      echo -e "\n\n"
      if [[ $REPLY =~ ^[Nn]$ ]]; then
        return 0 # Update available, but user chooses not to update
      fi
    fi
  else
    return 0 # No update available
  fi
  mv "${tmpfile}" "${SCRIPT_DIR}/updater.sh"
  chmod u+x "${SCRIPT_DIR}/updater.sh"
  "${SCRIPT_DIR}/updater.sh" "$@ -d"
  exit 1
}


#########################
#    Update user.js     #
#########################

# Returns version number of a user.js file
get_userjs_version () {
  if [ -e $1 ]; then
    echo "$(sed -n '4p' "$1")"
  else
    echo "Not detected."
  fi
}

add_override () {
  input=$1
  if [ -f "$input" ]; then
    echo "" >> user.js
    cat "$input" >> user.js
    echo -e "Status: ${GREEN}Override file appended:${NC} ${input}"
  elif [ -d "$input" ]; then
    FSAVEIFS=$IFS
    IFS=$'\n\b' # Set IFS
    FILES="${input}"/*.js
    for f in $FILES
    do
      add_override "$f"
    done
    IFS=$SAVEIFS # restore $IFS
  else
    echo -e "${ORANGE}Warning: Could not find override file:${NC} ${input}"
  fi
}

remove_comments () { # expects 2 arguments: from-file and to-file
  sed -e 's/^[[:space:]]*\/\/.*$//' -e '/^\/\*/,/\*\//d' -e '/^[[:space:]]*$/d' -e 's/);[[:space:]]*\/\/.*/);/' "$1" > "$2"
}

# Applies latest version of user.js and any custom overrides
update_userjs () {
  declare -r newfile=$(download_file 'https://raw.githubusercontent.com/ghacksuserjs/ghacks-user.js/master/user.js')

  echo 'Please observe the following information:'
  echo -e "\tFirefox profile:  ${ORANGE}$(pwd)${NC}"
  echo -e "\tAvailable online: ${ORANGE}$(get_userjs_version $newfile)${NC}"
  echo -e "\tCurrently using:  ${ORANGE}$(get_userjs_version user.js)\n${NC}\n"

  if [ $CONFIRM = 'yes' ]; then
    echo -e "This script will update to the latest user.js file and append any custom configurations from user-overrides.js. ${RED}Continue Y/N? ${NC}"
    read -p "" -n 1 -r
    echo -e "\n"
    if [[ $REPLY =~ ^[Nn]$ ]]; then
      echo -e "${RED}Process aborted${NC}"
      rm $newfile
      return 1
    fi
  fi

  # Copy a version of user.js to diffs folder for later comparison
  if [ "$COMPARE" = true ]; then
    mkdir -p userjs_diffs
    cp user.js userjs_diffs/past_user.js &>/dev/null
  fi

  # backup user.js
  mkdir -p userjs_backups
  local bakname="userjs_backups/user.js.backup.$(date +"%Y-%m-%d_%H%M")"
  if [ $BACKUP = 'single' ]; then
    bakname='userjs_backups/user.js.backup'
  fi
  cp user.js "$bakname" &>/dev/null

  mv "${newfile}" user.js
  echo -e "Status: ${GREEN}user.js has been backed up and replaced with the latest version!${NC}"

  # apply overrides
  if [ "$SKIPOVERRIDE" = false ]; then
    while IFS=',' read -ra FILE; do
      add_override "$FILE"
    done <<< "$OVERRIDE"
  fi

  # create diff
  if [ "$COMPARE" = true ]; then
    pastuserjs='userjs_diffs/past_user.js'
    past_nocomments='userjs_diffs/past_userjs.txt'
    current_nocomments='userjs_diffs/current_userjs.txt'

    remove_comments $pastuserjs $past_nocomments
    remove_comments user.js $current_nocomments

    diffname="userjs_diffs/diff_$(date +"%Y-%m-%d_%H%M").txt"
    diff=$(diff -w -B -U 0 $past_nocomments $current_nocomments)
    if [ ! -z "$diff" ]; then
      echo "$diff" > "$diffname"
      echo -e "Status: ${GREEN}A diff file was created:${NC} ${PWD}/${diffname}"
    else
      echo -e "Warning: ${ORANGE}Your new user.js file appears to be identical.  No diff file was created.${NC}"
    fi
    rm $past_nocomments $current_nocomments $pastuserjs &>/dev/null
  fi

  if [ "$VIEW" = true ]; then open_file "${PWD}/user.js"; fi
}

#########################
#        Execute        #
#########################

if [ $# != 0 ]; then
  readonly legacy_lc=$(echo $1 | tr '[A-Z]' '[a-z]')
  # Display usage if first argument is -help or --help
  if [ $1 = '--help' ] || [ $1 = '-help' ]; then
    usage
  elif [ $legacy_lc = '-donotupdate' ]; then
    UPDATE='no'
    legacy_argument $1
  elif [ $legacy_lc = '-update' ]; then
    UPDATE='yes'
    legacy_argument $1
  else
    while getopts ":hp:ludsno:bcvr" opt; do
      case $opt in
        h)
          usage
          ;;
        p)
          PROFILE_PATH=${OPTARG}
          ;;
        l)
          PROFILE_PATH='list'
          ;;
        u)
          UPDATE='yes'
          ;;
        d)
          UPDATE='no'
          ;;
        s)
          CONFIRM='no'
          ;;
        n)
          SKIPOVERRIDE=true
          ;;
        o)
          OVERRIDE=${OPTARG}
          ;;
        b)
          BACKUP='single'
          ;;
        c)
          COMPARE=true
          ;;
        v)
          VIEW=true
          ;;
        r)
          tfile=$(download_file 'https://raw.githubusercontent.com/ghacksuserjs/ghacks-user.js/master/user.js')
          mv $tfile "${tfile}.js"
          echo -e "${ORANGE}Warning: user.js was saved to temporary file ${tfile}.js${NC}"
          open_file "${tfile}.js"
          exit 1
          ;;
        \?)
          echo -e "${RED}\n Error! Invalid option: -$OPTARG${NC}" >&2
          usage
          ;;
        :)
          echo -e "${RED}Error! Option -$OPTARG requires an argument.${NC}" >&2
          exit 1
          ;;
      esac
    done
  fi
fi

show_banner
update_updater

getProfilePath # updates PROFILE_PATH or exits on error
cd "$PROFILE_PATH" && update_userjs

cd "$CURRDIR"