user/bk-gpgfp-noemail

   1 #!/usr/bin/env bash
   2 # Desc: Gets gpg fingerprint but replaces uid email addresses with hashes
   3 # Usage: bk-gpgfp-noemail 0xdc3469c9 74810B012346C9A6
   4 # Depends: gpg, b2sum
   5
   6 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
   7 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
   8 try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
   9 check_resembles_gpg_fingerprint() {
  10     # Desc: Checks if input string looks like gpg fingerprint
  11     # Usage: check_resembles_gpg_fingerprint arg1
  12     # Input: arg1: string
  13     # Output: exit code: 0 if arg1 is fingerprint, 1 otherwise
  14     # Depends: yell(), die(), try()
  15     # Version: 0.0.1
  16     local pattern1 pattern2 input input_length
  17
  18     # Check args
  19     if [[ $# -ne 1 ]]; then
  20         die "ERROR:Invalid number of arguments:$#";
  21     else
  22         input="$1";
  23     fi;
  24
  25     ## Trim leading `0x`
  26     pattern1="(0x)(.*)";
  27     if [[ $input =~ $pattern1 ]]; then
  28         input="${input:2}";
  29         #yell "DEBUG:input:$input";
  30     fi;
  31
  32     ## Check if char count multiple of 8
  33     input_length="${#input}";
  34     if [[ ! $(( input_length % 8 )) -eq 0 ]]; then
  35         yell "DEBUG:Length not a multiple of 8:$input_length:$input";
  36         return 1;
  37     fi;
  38
  39     ## Check if hexadecimal
  40     pattern2="[0-9A-Fa-f]{8,40}";
  41     if [[ $1 =~ $pattern2 ]]; then
  42         #yell "DEBUG:is a fingerprint:$arg";
  43         return 0;
  44     else
  45         #yell "DEBUG:Not a fingerprint:$arg";
  46         return 1;
  47     fi;
  48 }; # Checks if input string looks like gpg fingerprint
  49 main() {
  50     # Desc: main program
  51     # Depends: gpg, b2sum
  52     # Ref/Attrib: [1] Manipulating Strings. https://tldp.org/LDP/abs/html/string-manipulation.html
  53     declare -a fingerprints
  54     local gpg_text gpg_text_buffer pattern email
  55
  56     # Check arguments
  57     n=0;
  58     for arg in "$@"; do
  59         ((n++));
  60         #yell "DEBUG:n:$n";
  61         #yell "DEBUG:arg:$arg";
  62
  63         # Check if arg resembles gpg fignerprint
  64         if check_resembles_gpg_fingerprint "$arg"; then
  65             #yell "DEBUG:Resembles a gpg fingerprint:$arg";
  66             fingerprints+=("$arg");
  67             #yell "DEBUG:fingerprints:$(declare -p fingerprints)";
  68         else
  69             die "ERROR:Doesn't resemble a gpg fingerprint:$arg";
  70         fi;
  71     done;
  72
  73     # Process fingerprints
  74     for arg in "${fingerprints[@]}"; do
  75         # Get gpg fingerprint text
  76         gpg_text="$(gpg --fingerprint --fingerprint "$arg" 2>&1)";
  77         #yell "DEBUG:gpg_text:$gpg_text";
  78
  79         # Trim emails
  80         gpg_text_buffer="";
  81         while IFS= read -r line; do
  82             #yell "DEBUG:line:$line";
  83             ## Read $gpg_text line-by-line
  84
  85             # Skip lines that don't start with 'uid'
  86             pattern="^uid";
  87             if [[ ! $line =~ $pattern ]]; then
  88                 #yell "DEBUG:line doesn't start with \"uid\":$line";
  89                 gpg_text_buffer="$(printf "%s\n%s" "$gpg_text_buffer" "$line")";
  90                 continue;
  91             fi;
  92
  93             # Trim email from $line
  94             ## Get email
  95             email="$(expr match "$line" '.*\(<.*$\)')";
  96             #yell "DEBUG:email1:$email";
  97             email="${email%>*}";
  98             #yell "DEBUG:email2:$email";
  99             email="${email#*<}";
 100             #yell "DEBUG:email3:$email";
 101
 102             ## Strip email from $line
 103             line="${line% <*}"; # See [1]
 104             #yell "DEBUG:line1:$line";
 105
 106             ## Add hashed email if $email length non-zero
 107             if [[ -n $email ]]; then
 108                 email_hash="$(echo -n "$email" | b2sum -l32 | cut -d' ' -f1)"; # hash email using b2sum
 109                 #yell "DEBUG:email_hash:$email_hash";
 110                 line="$line <$email_hash>";
 111                 #yell "DEBUG:line3:$line";
 112             fi;
 113
 114             ## Append $line to $gpg_text_buffer
 115             gpg_text_buffer="$(printf "%s\n%s" "$gpg_text_buffer" "$line")";
 116             #done < <(echo "$gpg_text");
 117         done < <(printf "%s" "$gpg_text");
 118         echo "$gpg_text_buffer";
 119     done;
 120 }; # main program
 121
 122 main "$@";
 123
 124 # Author: Steven Baltakatei Sandoval
 125 # License: GPLv3+