Easily view encrypted files

viewenc

#!/bin/bash

# Felix E. Klee <felix.klee@inka.de>

# Usage info
show_help() {
    cat << EOF
Usage: ${0##*/} ENCRYPTED.gpg
Decrypts ENCRYPTED.gpg and displays its contents.
EOF
}

if [ "$#" -ne 1 ]
then
    show_help >&2
    exit 1
fi

show_unknown_format_error() {
    echo "Don't what to do with $FILENAME"
}

FILENAME="$1"
if [[ "$FILENAME" != *.gpg ]]
then
    show_unknown_format_error >&2
    exit 1
fi

BASENAME=$(basename "$FILENAME" .gpg)
EXTENSION=${BASENAME##*.}
case $EXTENSION in
    pdf|PDF)
        echo "The file will be decrypted temporarily to /tmp"
        read -p "Continue? " -n 1 -r
        echo    # (optional) move to a new line
        if [[ $REPLY =~ ^[Yy]$ ]]
        then
            gpg -d "$FILENAME" | zathura -
        fi
    ;;
    jpg|JPG|jpeg|JPEG)
        gpg -d "$FILENAME" | \
            display -auto-orient -resize 1024x768 -immutable \
                    -geometry 1024x768-0+0
    ;;
    *)
        show_unknown_format_error >&2
        exit 1
    ;;
esac