kool-dev · dbpolito · Jun 20, 2023 · Jun 20, 2023
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 1,4 @@
-FROM node:16-alpine
 FROM node:18-alpine
 
 # as suggested at https://github.com/puppeteer/puppeteer/blob/main/docs/troubleshooting.md#running-puppeteer-in-docker
 

diff --git a/shrinkpdf.sh b/shrinkpdf.sh
@@ -1,9 1,9 @@
 #!/bin/sh
 
-# http://www.alfredklomp.com/programming/shrinkpdf
 # https://github.com/aklomp/shrinkpdf
 # Licensed under the 3-clause BSD license:
 #
-# Copyright (c) 2014-2019, Alfred Klomp
 # Copyright (c) 2014-2022, Alfred Klomp
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -32,68 32,144 @@
 
 shrink ()
 {
  if [ "$grayscale" = "YES" ]; then
  gray_params="-sProcessColorModel=DeviceGray \
  -sColorConversionStrategy=Gray \
  -dOverrideICC"
  else
  gray_params=""
  fi
 
  # Allow unquoted variables; we want word splitting for $gray_params.
  # shellcheck disable=SC2086
  gs \
  -q -dNOPAUSE -dBATCH -dSAFER \
  -sDEVICE=pdfwrite \
- -dCompatibilityLevel=1.3 \
  -dCompatibilityLevel="$4" \
  -dPDFSETTINGS=/screen \
  -dEmbedAllFonts=true \
  -dSubsetFonts=true \
  -dAutoRotatePages=/None \
  -dColorImageDownsampleType=/Bicubic \
- -dColorImageResolution=$3 \
  -dColorImageResolution="$3" \
  -dGrayImageDownsampleType=/Bicubic \
- -dGrayImageResolution=$3 \
  -dGrayImageResolution="$3" \
  -dMonoImageDownsampleType=/Subsample \
- -dMonoImageResolution=$3 \
  -dMonoImageResolution="$3" \
  -sOutputFile="$2" \
  ${gray_params} \
  "$1"
 }
 
 get_pdf_version ()
 {
  # $1 is the input file. The PDF version is contained in the
  # first 1024 bytes and will be extracted from the PDF file.
  pdf_version=$(cut -b -1024 "$1" | awk 'BEGIN { found=0 }{ if (match($0, "%PDF-[0-9]\\.[0-9]") && ! found) { print substr($0, RSTART 5, 3); found=1 } }')
  if [ -z "$pdf_version" ] || [ "${#pdf_version}" != "3" ]; then
  return 1
  fi
 }
 
 
 check_input_file ()
 {
  # Check if the given file exists.
  if [ ! -f "$1" ]; then
  echo "Error: Input file does not exist." >&2
  return 1
  fi
 }
 
 check_smaller ()
 {
  # If $1 and $2 are regular files, we can compare file sizes to
  # see if we succeeded in shrinking. If not, we copy $1 over $2:
- if [ ! -f "$1" -o ! -f "$2" ]; then
  if [ ! -f "$1" ] || [ ! -f "$2" ]; then
  return 0;
  fi
- ISIZE="$(echo $(wc -c "$1") | cut -f1 -d\ )"
- OSIZE="$(echo $(wc -c "$2") | cut -f1 -d\ )"
  ISIZE="$(wc -c "$1" | awk '{ print $1 }')"
  OSIZE="$(wc -c "$2" | awk '{ print $1 }')"
  if [ "$ISIZE" -lt "$OSIZE" ]; then
  echo "Input smaller than output, doing straight copy" >&2
  cp "$1" "$2"
  fi
 }
 
 check_overwrite ()
 {
  # If $1 and $2 refer to the same file, then the file would get
  # truncated to zero, which is unexpected. Abort the operation.
  # Unfortunately the stronger `-ef` test is not in POSIX.
  if [ "$1" = "$2" ]; then
  echo "The output file is the same as the input file. This would truncate the file." >&2
  echo "Use a temporary file as an intermediate step." >&2
  return 1
  fi
 }
 
 usage ()
 {
  echo "Reduces PDF filesize by lossy recompressing with Ghostscript."
  echo "Not guaranteed to succeed, but usually works."
- echo " Usage: $1 infile [outfile] [resolution_in_dpi]"
  echo
  echo "Usage: $1 [-g] [-h] [-o output] [-r res] infile"
  echo
  echo "Options:"
  echo " -g Enable grayscale conversion which can further reduce output size."
  echo " -h Show this help text."
  echo " -o Output file, default is standard output."
  echo " -r Resolution in DPI, default is 72."
 }
 
-IFILE="$1"
 # Set default option values.
 grayscale=""
 ofile="-"
 res="72"
 
 # Parse command line options.
 while getopts ':hgo:r:' flag; do
  case $flag in
  h)
  usage "$0"
  exit 0
  ;;
  g)
  grayscale="YES"
  ;;
  o)
  ofile="${OPTARG}"
  ;;
  r)
  res="${OPTARG}"
  ;;
  \?)
  echo "invalid option (use -h for help)"
  exit 1
  ;;
  esac
 done
 shift $((OPTIND - 1))
 
-# Need an input file:
-if [ -z "$IFILE" ]; then
 # An input file is required.
 if [ -z "$1" ]; then
  usage "$0"
  exit 1
-fi
-
-# Output filename defaults to "-" (stdout) unless given:
-if [ ! -z "$2" ]; then
- OFILE="$2"
 else
- OFILE="-"
  ifile="$1"
 fi
 
-# Output resolution defaults to 72 unless given:
-if [ ! -z "$3" ]; then
- res="$3"
-else
- res="72"
-fi
 # Check if input file exists
 check_input_file "$ifile" || exit $?
 
 # Check that the output file is not the same as the input file.
 check_overwrite "$ifile" "$ofile" || exit $?
 
 # Get the PDF version of the input file.
 get_pdf_version "$ifile" || pdf_version="1.5"
 
-shrink "$IFILE" "$OFILE" "$res" || exit $?
 # Shrink the PDF.
 shrink "$ifile" "$ofile" "$res" "$pdf_version" || exit $?
 
-check_smaller "$IFILE" "$OFILE"
 # Check that the output is actually smaller.
 check_smaller "$ifile" "$ofile"