91 lines
2.5 KiB
Bash
Executable File
91 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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# qpdf-decode: a script for calling qpdf with a password to decrypt a pdf.
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# If the operation succeeds, the output will be a default new file adding a
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# suffix "_decrypted" to the source file name. Be careful: if the output file
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# already exists, it will be overwritten without warning!
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#
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# Parameters:
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# 1st. PASSWORD
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# 2nd. file to be decrypted
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# 3rd. (optional) file to save (default: the same name concatenating _decrypted)
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#
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# Copyright © 2023 Daltux <https://daltux.net/>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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app_title=qpdf-decode
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app_version=0.2.0
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about() {
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echo "$app_title: decrypts a pdf"
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echo "Version $app_version"
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echo
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echo "Copyright (C) 2023 Daltux <https://daltux.net>"
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echo "This program comes with ABSOLUTELY NO WARRANTY;"
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echo "This is Free Software, and you are welcome to redistribute it under certain conditions. For details, see the GNU General Public License, version 3 or later."
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echo
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echo "Usage:"
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echo " $0 <password> <file to decode> [optional: file to save (default *_decrypted)]"
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echo
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echo "Be careful: if the output file already exists, it will be overwritten without warning!"
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echo
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echo "Exit codes meaning:"
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echo " 0: no errors or warnings"
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echo " 1: unable to invoke qpdf"
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echo " 2: qpdf error"
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echo " 3: qpdf warning"
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echo " 4: missing password for decryption"
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echo " 5: missing reference to file"
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}
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# strFind <string> <substring to find>
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strFind() {
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case $1 in
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(*"$2"*) return 0;;
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esac
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return 1
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}
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params=${1+"$@"}
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if [ -z "$1" ] || [ "$1" = '-h' ] || strFind "$params" "--help" ; then
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about
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exit
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fi
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pass=$1
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infile=$2
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if [ -z "$pass" ] ; then
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echo ERROR: missing a password for decrypting the pdf file.
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exit 4
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fi
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if [ -z "$infile" ] ; then
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echo ERROR: missing reference to a pdf file for processing.
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exit 5
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fi
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outfile=${infile}_decrypted
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outfile=${3:-$outfile}
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if command -v qpdf > /dev/null 2>&1 ; then
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qpdf --verbose --password="$pass" --decrypt "$infile" "$outfile"
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else
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echo qpdf not found!
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exit 1
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fi
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