103 lines
2.4 KiB
Bash
103 lines
2.4 KiB
Bash
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#!/bin/bash
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#################
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# PREREQUISITES #
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#################
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# executables in PATH
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for prereq in "python3" "gs" "pdftk"; do
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if ! command -v "${prereq}" &> /dev/null; then
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echo "required executable '${prereq}' not found!"
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exit 1
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fi
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done
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# python virtual env with PyMuPDF
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VENV_DIR="pdfsign.venv"
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if [ -d "${VENV_DIR}" ]; then
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# venv exists, activate it
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source "${VENV_DIR}/bin/activate"
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else
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for prereq in "venv"; do
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if ! python3 -c "import ${prereq}" &> /dev/null; then
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echo "python module '${prereq}' not found!"
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exit 1
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fi
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done
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# create venv and activate
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python3 -m "venv" "${VENV_DIR}"
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source "${VENV_DIR}/bin/activate"
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# install PyMuPDF
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python3 -m "pip" install PyMuPDF
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fi
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############
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# CLI ARGS #
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############
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if [ $# -lt 2 ]; then
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echo "Usage: ${0} <input.pdf> <signed.png> [PAGE]"
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echo
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echo "Replaces page PAGE with the signed version."
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echo "If PAGE is not given, the last page is replaced."
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exit 1
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fi
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IN_TEXT_PDF="${1}"
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IN_SCAN_IMG="${2}"
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OUT_PDF="${IN_TEXT_PDF%%.*}_pdfsign.pdf"
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IN_TEXT_PDF_LEN="$( pdftk "${IN_TEXT_PDF}" dump_data | grep NumberOfPages | awk '{print $2}' )"
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IN_PAGE="${3:-${IN_TEXT_PDF_LEN}}"
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RANGES="B1"
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if [ ${IN_PAGE} -gt 1 ]; then
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RANGES="A1-$(( IN_PAGE - 1 )) ${RANGES}"
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fi
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if [ ${IN_PAGE} -lt ${IN_TEXT_PDF_LEN} ]; then
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RANGES="${RANGES} A$(( IN_PAGE + 1 ))-${IN_TEXT_PDF_LEN}"
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fi
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################
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# MAIN PROGRAM #
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################
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GSFLAGS="-sDEVICE=pdfwrite -dSAFER -dNOPAUSE -dQUIET -dBATCH"
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set -e
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# extract IN_PAGE (text-only) from IN_TEXT_PDF
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gs ${GSFLAGS} \
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-dFirstPage="${IN_PAGE}" -dLastPage="${IN_PAGE}" \
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-dFILTERIMAGE -dFILTERVECTOR -dFILTERTEXT=false \
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-sOutputFile=".pdfsign_textonly.pdf" \
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"${IN_TEXT_PDF}"
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# use IN_SCAN_IMG as background, layering text from extracted page on top
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python3 ./pdfsign.py \
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".pdfsign_textonly.pdf" "${IN_SCAN_IMG}" \
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".pdfsign_signed.pdf"
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rm ".pdfsign_textonly.pdf"
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# replace IN_PAGE in IN_TEXT_PDF layered page
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pdftk A="${IN_TEXT_PDF}" B=".pdfsign_signed.pdf" \
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cat ${RANGES} \
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output ".pdfsign_concat.pdf"
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rm ".pdfsign_signed.pdf"
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# postprocess/compress pdf
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gs ${GSFLAGS} \
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-sPAPERSIZE=a4 -dFIXEDMEDIA -dPDFFitPage \
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-dCompatibilityLevel=1.7 -dPDFSETTINGS=/ebook \
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-sOutputFile="${OUT_PDF}" \
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".pdfsign_concat.pdf"
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rm ".pdfsign_concat.pdf"
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