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|
#!/bin/sh
#
# SRI Hash Generator
#
# A safer alternative than using external services such as
# https://www.srihash.org
#
# Parameters
BASENAME="`basename $0`"
URI="$1"
TYPE="${2:-sha512}"
# Check
if [ -z "$URI" ]; then
echo "usage: $BASENAME <file-or-url>"
exit 1
fi
# Get file
if echo "$URI" | grep -q '^http'; then
echo "downloading $URI and generating hash..."
HASH="`curl $URI | openssl dgst -$TYPE -binary | openssl base64 -A`"
echo ""
else
if [ -e "$URI" ]; then
# See https://www.srihash.org/
HASH="`openssl dgst -$TYPE -binary $URI | openssl base64 -A`"
else
echo "file not found: $URI"
exit 1
fi
fi
# Generate
if echo $URL | grep -q '.js$'; then
cat <<EOF
<script
src="$URI"
integrity="$TYPE-$HASH"
crossorigin="anonymous"
referrerpolicy="no-referrer"
></script>
EOF
else
cat <<EOF
<link
href="$URI"
rel="stylesheet"
integrity="$TYPE-$HASH"
crossorigin="anonymous"
referrerpolicy="no-referrer"
></script>
EOF
fi
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