Andrew's git - newtab.git/blob

   1# Purpose: Pack a Chromium extension directory into crx3 format
   2#
   3# Sources:
   4# https://stackoverflow.com/a/18709204
   5# https://cs.chromium.org/chromium/src/components/crx_file/crx3.proto?l=1&rcl=09de3b4e1e13cf10e431ba119b179169cde289fe
   6#
   7# Modified by Andrew Lorimer, August 2019
   8#
   9
  10description="\e[34m$(basename "$0")\e[0m
  11Pack a Chromium extension into CRX3 format
  12
  13"
  14usageshort="\e[1mUSAGE:\e[0m
  15  $(basename "$0") [-s src_dir] [-p private_key] [-d output.crx]\n"
  16usage="
  17\e[1mOPTIONS:\e[0m
  18  -s, --source
  19    Directory containing all source files to be included in extension.
  20    Default: ./src
  21
  22  -d, --destination
  23    Name of a file where generated crx file will be placed. Extisting files will be overwritten.
  24    Default: ./build/extension.crx
  25
  26  -p, --private
  27    Location of the private key file.
  28    Default: ./extension.pem
  29
  30  -n, --name
  31    Use this as the file name instead of \"extension\" in the above file paths.
  32
  33  -h, --help
  34    Show this help message\n"
  35
  36dir="$(pwd -P)/src"
  37name=$(basename $(pwd -P))
  38key=$(pwd -P)/$name.pem
  39
  40while [ $# -gt 0 ]; do
  41  case "$1" in
  42    -h|--help)
  43      printf "$description$usageshort$usage" 
  44      exit
  45      ;;
  46    -s|--source)
  47      dir=(${2-})
  48      echo "Using source directory $dir"
  49      shift
  50      ;;
  51    -d|--destination)
  52      out=(${2-})
  53      echo "Generating crx output at $out"
  54      shift
  55      ;;
  56    -p|--private)
  57      key=(${2-})
  58      shift
  59      ;;
  60    -n|--name)
  61      name=(${2-})
  62      shift
  63      ;;
  64    --)
  65      break
  66      ;;
  67    *)
  68      printf "\x1b[31mInvalid argument $1\x1b[0m\n\n"
  69      printf "$usageshort"
  70      exit 1
  71      ;;
  72  esac
  73  shift
  74done
  75
  76if [ -z $out ]; then out="$name.crx"; fi
  77pub="$name.pub"
  78sig="$name.sig"
  79zip="$name.zip"
  80tosign="$name.presig"
  81binary_crx_id="$name.crxid"
  82trap 'rm -f "$pub" "$sig" "$zip" "$tosign" "$binary_crx_id"' EXIT
  83
  84printf "Building $(realpath --relative-to=`pwd` $dir) to $(realpath --relative-to=`pwd` $out) with private key $(realpath --relative-to=`pwd` $key)\n"
  85
  86# Zip crx directory
  87printf "\tZipping source directory\n"
  88cwd=$(pwd -P)
  89(cd "$dir" && zip -qr -9 -X "$cwd/$zip" .)
  90
  91
  92# Extract crx id
  93printf "\tExtracting crx id\n"
  94{
  95  openssl rsa -in "$key" -pubout -outform der | openssl dgst -sha256 -binary -out "$binary_crx_id"
  96} &> /dev/null
  97truncate -s 16 "$binary_crx_id"
  98
  99# Generate file to sign
 100printf "\tSigning crx file\n"
 101(
 102  printf "CRX3 SignedData"
 103  echo "00 12 00 00 00 0A 10" | xxd -r -p
 104  cat "$binary_crx_id" "$zip"
 105) > "$tosign"
 106
 107openssl dgst -sha256 -binary -sign "$key" < "$tosign" > "$sig" # Signature
 108openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null # Public key
 109
 110crmagic_hex="43 72 32 34" # Cr24
 111version_hex="03 00 00 00" # 3
 112header_length="45 02 00 00"
 113header_chunk_1="12 AC 04 0A A6 02"
 114header_chunk_2="12 80 02"
 115header_chunk_3="82 F1 04 12 0A 10"
 116(
 117  echo "$crmagic_hex $version_hex $header_length $header_chunk_1" | xxd -r -p
 118  cat "$pub"
 119  echo "$header_chunk_2" | xxd -r -p
 120  cat "$sig"
 121  echo "$header_chunk_3" | xxd -r -p
 122  cat "$binary_crx_id" "$zip"
 123) > "$out"
 124printf "\tWrote $out\n"