unitproc/bkt-check_resembles_gpg_fingerprint

   1 #!/usr/bin/env bash
   2
   3 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
   4 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
   5 try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
   6 check_resembles_gpg_fingerprint() {
   7     # Desc: Checks if input string looks like gpg fingerprint
   8     # Usage: check_resembles_gpg_fingerprint arg1
   9     # Input: arg1: string
  10     # Output: exit code: 0 if arg1 is fingerprint, 1 otherwise
  11     # Depends: yell(), die(), try()
  12     # Version: 0.0.1
  13     local pattern1 pattern2 input input_length
  14
  15     # Check args
  16     if [[ $# -ne 1 ]]; then
  17         die "ERROR:Invalid number of arguments:$#";
  18     else
  19         input="$1";
  20     fi;
  21
  22     ## Trim leading `0x`
  23     pattern1="(0x)(.*)";
  24     if [[ $input =~ $pattern1 ]]; then
  25         input="${input:2}";
  26         #yell "DEBUG:input:$input";
  27     fi;
  28
  29     ## Check if char count multiple of 8
  30     input_length="${#input}";
  31     if [[ ! $(( input_length % 8 )) -eq 0 ]]; then
  32         yell "DEBUG:Length not a multiple of 8:$input_length:$input";
  33         return 1;
  34     fi;
  35
  36     ## Check if hexadecimal
  37     pattern2="[0-9A-Fa-f]{8,40}";
  38     if [[ $1 =~ $pattern2 ]]; then
  39         #yell "DEBUG:is a fingerprint:$arg";
  40         return 0;
  41     else
  42         #yell "DEBUG:Not a fingerprint:$arg";
  43         return 1;
  44     fi;
  45 }; # Checks if input string looks like gpg fingerprint
  46
  47
  48 # test code
  49 myVar="0xdc3469c9";
  50 if check_resembles_gpg_fingerprint "$myVar"; then
  51     yell "Looks like a gpg fingerprint:$myVar";
  52 else
  53     yell "Doesn't look like a gpg fingerprint:$myVar";
  54 fi;
  55
  56 myVar="69B4C4CDC628F8F9";
  57 if check_resembles_gpg_fingerprint "$myVar"; then
  58     yell "Looks like a gpg fingerprint:$myVar";
  59 else
  60     yell "Doesn't look like a gpg fingerprint:$myVar";
  61 fi;
  62
  63 myVar="26646D99CBAEC9B81982EF6029D9EE6B1FC730C1";
  64 if check_resembles_gpg_fingerprint "$myVar"; then
  65     yell "Looks like a gpg fingerprint:$myVar";
  66 else
  67     yell "Doesn't look like a gpg fingerprint:$myVar";
  68 fi;
  69
  70 myVar="deadbeef";
  71 if check_resembles_gpg_fingerprint "$myVar"; then
  72     yell "Looks like a gpg fingerprint:$myVar";
  73 else
  74     yell "Doesn't look like a gpg fingerprint:$myVar";
  75 fi;
  76
  77 myVar="foobar";
  78 if check_resembles_gpg_fingerprint "$myVar"; then
  79     yell "Looks like a gpg fingerprint:$myVar";
  80 else
  81     yell "Doesn't look like a gpg fingerprint:$myVar";
  82 fi;
  83
  84 myVar="zzzzzzzz";
  85 if check_resembles_gpg_fingerprint "$myVar"; then
  86     yell "Looks like a gpg fingerprint:$myVar";
  87 else
  88     yell "Doesn't look like a gpg fingerprint:$myVar";
  89 fi;