feat(unitproc):Add script to check if string is gpg fingerprint

[BK-2020-03.git] / unitproc / bktemp-check_gpg_fingerprint

#!/usr/bin/env bash

yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
check_gpg_fingerprint() {
    # Desc: Checks if input string looks like gpg fingerprint
    # Usage: check_gpg_fingerprint arg1
    # Input: arg1: string
    # Output: exit code: 0 if arg1 is fingerprint, 1 otherwise
    # Depends: yell(), die(), try()
    # Version: 0.0.1
    local pattern1 pattern2 input input_length

    # Check args
    if [[ $# -ne 1 ]]; then
	die "ERROR:Invalid number of arguments:$#";
    else
	input="$1";
    fi;

    ## Trim leading `0x`
    pattern1="(0x)(.*)";
    if [[ $input =~ $pattern1 ]]; then
	input="$(echo "$input" | sed 's/^..//')";
	#yell "DEBUG:input:$input";
    fi;
    
    ## Check if char count multiple of 8
    input_length="${#input}";
    if [[ ! $(( input_length % 8 )) -eq 0 ]]; then
	yell "DEBUG:Length not a multiple of 8:$input_length:$input";
	return 1;
    fi;

    ## Check if hexadecimal
    pattern2="[0-9A-Fa-f]{8,40}";
    if [[ $1 =~ $pattern2 ]]; then
	#yell "DEBUG:is a fingerprint:$arg";
	return 0;
    else
	#yell "DEBUG:Not a fingerprint:$arg";
	return 1;
    fi;
}; # Checks if input string looks like gpg fingerprint


# test code
myVar="0xdc3469c9";
if check_gpg_fingerprint "$myVar"; then
    yell "Looks like a gpg fingerprint:$myVar";
else
    yell "Doesn't look like a gpg fingerprint:$myVar";
fi;