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#!/bin/sh
if ! [ $(id -u) = 0 ]; then
echo 'This utility requires root privileges.' >&2
exit 1
fi
if [ -z "$NGINX_BLOCKED_DOMAINS_CONF" ]
NGINX_BLOCKED_DOMAINS_CONF='/etc/nginx/conf.d/blocked-domains.conf'
fi
if [ -z "$BLOCKED_DOMAINS_FILE" ]; then
BLOCKED_DOMAINS_FILE='/var/lib/mastodon/conf/blocklist.txt'
fi
# does the domain blocks file exist?
if [ ! -f "$BLOCKED_DOMAINS_FILE" ]; then
echo "No blocked domains file exists at '$BLOCKED_DOMAINS_FILE'." >&2
exit 1
fi
# does the domain block map file for nginx exist?
if [ ! -f "$NGINX_BLOCKED_DOMAINS_CONF" ]; then
# try to create the parent directory if needed
parent_dir=$(dirname "$NGINX_BLOCKED_DOMAINS_CONF")
mkdir -p "$parent_dir"
# then try to create the file if needed
if ! touch -a "$f"
echo "Can't create '$NGINX_BLOCKED_DOMAINS_CONF'." >&2
echo 'Check $NGINX_BLOCKED_DOMAINS_CONF variable or directory permissions.' >&2
exit 1
fi
fi
generate_map () {
echo '# to use, include the following in the "server" block of your nginx conf'
echo '# for mastodon **before any "location" blocks**:'
echo '#'
echo '# if ($blocked_domain = "1") { return 444; }'
echo
echo 'map $http_user_agent $blocked_domain {'
echo ' default 0;'
awk '/^[[:word:]]\.[[:word:]][[:word:].]*$/ { gsub("\\.", "\\.", $1); print " \"~*(?:\\b)"$1"(?:\\b)\" 1;" }' "$BLOCKED_DOMAINS_FILE"
echo '}'
}
generate_map > "$NGINX_BLOCKED_DOMAINS_CONF"
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