128 lines
3.5 KiB
Bash
Executable File
128 lines
3.5 KiB
Bash
Executable File
#!/bin/sh
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#
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## generate SRI checksums
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#
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### text formatting presets
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if command -v tput > /dev/null; then
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cyan=$(tput setaf 6)
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err=$(tput bold)$(tput setaf 1)
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magenta=$(tput setaf 5)
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norm=$(tput sgr0)
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ok=$(tput setaf 2)
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else
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cyan=''
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err=''
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magenta=''
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norm=''
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ok=''
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fi
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### trap
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trap trapExit 1 2 3 6
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### functions
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displayError (){
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printf "\n%sERROR: %s\n" "$err" "$2"
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printf "Exiting now.%s\n\n" "$norm"
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exit "$1"
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}
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scriptHelp (){
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printf "\n%sUsage: %s%s %s[--help] [--sha256|--sha384|--sha512] --file /file/to/hash%s\n\n" "$magenta" "$norm" "$scriptName" "$cyan" "$norm"
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printf "%s---parameters---%s\n" "$magenta" "$norm"
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printf "%s-h|-?|--help%s: show this help page\n" "$cyan" "$norm"
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printf "%s-2|--sha256%s: generate SHA256 SRI hash\n" "$cyan" "$norm"
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printf "%s-3|--sha384%s: generate SHA384 SRI hash (default)\n" "$cyan" "$norm"
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printf "%s-5|--sha512%s: generate SHA512 SRI hash\n" "$cyan" "$norm"
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printf "%s-f|--file%s: full path to the file for which you wish the SRI hash generated (required)\n\n" "$cyan" "$norm"
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printf "%s---examples---%s\n" "$magenta" "$norm"
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printf "Generate default SHA384 hash for styles.css located in the current directory:\n"
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printf "%s%s -f styles.css%s\n\n" "$cyan" "$scriptName" "$norm"
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printf "Generate SHA512 hash for /var/www/js/script.js:\n"
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printf "%s%s -5 --file /var/www/js/script.js%s\n\n" "$cyan" "$scriptName" "$norm"
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exit 0;
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}
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trapExit (){
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printf "\n%sERROR: Caught signal. Exiting.%s\n\n" "$err" "$norm"
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exit 99
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}
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### default variables
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scriptName="$( basename "$0" )"
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algo='sha384'
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unset filename
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### check pre-requisites
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if ! command -v openssl > /dev/null; then
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displayError 2 'openSSL is not installed'
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fi
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### process startup parameters
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if [ -z "$1" ]; then scriptHelp; fi
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while [ $# -gt 0 ]; do
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case "$1" in
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-h|-\?|--help)
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# display script help
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scriptHelp
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exit 0
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;;
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-2|--sha256)
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# generate SRI using sha256
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algo='sha256'
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;;
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-3|--sha384)
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# generate SRI using sha384 (default)
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algo='sha384'
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;;
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-5|--sha512)
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# generate SRI using sha512
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algo='sha512'
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;;
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-f|--file)
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# file for which to generate SRI hash
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if [ -n "$2" ]; then
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if [ -f "$2" ]; then
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filename="$2"
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shift
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else
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displayError 3 "Cannot find file '${2}'."
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fi
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else
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displayError 3 'No filename specified.'
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fi
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;;
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*)
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# unknown option
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printf "\n%sUnknown option: %s.\n" "$err" "$1"
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printf "%sUse '--help' for valid options.%s\n\n" "$cyan" "$norm"
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exit 1
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;;
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esac
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shift
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done
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printf "\n%sselected algo: %s%s\n" "$magenta" "$norm" "$algo"
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printf "%sselected file: %s%s%s\n\n" "$magenta" "$norm" "$filename" "$norm"
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### do SRI generation
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hash=$( openssl dgst -${algo} -binary "${filename}" | openssl base64 -A) > /dev/null 2>&1
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if [ -z "$hash" ]; then
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displayError 4 'An error occurred while generating SRI hash.'
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else
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printf "%sSRI hash: %s%s-%s%s\n\n" "$magenta" "$ok" "$algo" "$hash" "$norm"
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fi
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exit 0
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### error codes
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# 0: no errors, normal execution
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# 1: parameter error
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# 2: cannot find openSSL binary
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# 3: cannot find specified file for which to generate hash
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# 4: error occured while executing openssl
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#EOF |