Generate a hash to allow the execution of inline scripts in a Content Security Policy (CSP)

hash_csp.sh

# The below code snippet will output the expected hash of the script in the console 
# error message to use as a hash in a Content Security Policy (CSP). The CSP Level 
# 2 specification allows, sha256, sha384, and sha512 hash algorithms.
#
# Example: 
# 
# echo -n 'doSomething();' | openssl sha256 -binary | openssl base64
# RFWPLDbv2BY+rCkDzsE+0fr8ylGr2R2faWMhq4lfEQc=
# 
# Add the following to the script-src directive for your Content Security Policy. 
# script-src 'sha256-RFWPLDbv2BY+rCkDzsE+0fr8ylGr2R2faWMhq4lfEQc=';

echo -n '{{ script }}' | openssl {{ hash_algorithm }} -binary | openssl base64