env/utils/httpd/gen-index.sh

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#!/bin/sh
# httpd-utils
# Written in 2020 by Lucas
# CC0 1.0 Universal/Public domain - No rights reserved
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty. You should have received a copy of the CC0 Public Domain
# Dedication along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
usage()
{
printf "Usage: %s domain domain_v4 domain_v6\n" "${0##*/}" >&2
exit 1
}
list_codes()
{
case $1 in
1xx) q='1[0-9][0-9]' ;;
2xx) q='2[0-9][0-9]' ;;
3xx) q='3[0-9][0-9]' ;;
4xx) q='4[0-9][0-9]' ;;
5xx) q='5[0-9][0-9]' ;;
*) q=X ;;
esac
grep -x -- "$q" codes.txt
}
show_category()
{
_t=$1 _cc=$2
cat - <<EOF
<dl>
<dt>$_t $_cc</dt>
EOF
for _c in $(list_codes "$_cc"); do
printf '\t\t\t<dd><a href="/c/%u">%u</a></dd>\n' "$_c" "$_c"
done
printf "\t\t</dl>\n"
}
[ $# -eq 3 ] || usage
domain=$1 domain_v4=$2 domain_v6=$3
cat - <<EOF
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>$domain</title>
<style>
* {
margin: 0;
padding: 0;
}
body {
width: 800px;
margin: 20px auto;
font-size: 16px;
line-height: 20px;
}
h1,
h2,
dl {
margin-bottom: 20px;
}
dd {
margin-left: 20px;
}
h1 {
font-size: 32px;
line-height: 40px;
}
h2 {
font-size: 24px;
line-height: 40px;
}
</style>
</head>
<body>
<h1>$domain</h1>
<h2>Utilities</h2>
<dl>
<dt><a href="/ip">/ip</a></dt>
<dd>shows client IP.</dd>
<dt><a href="//$domain_v4/ip">$domain_v4/ip</a></dt>
<dd>shows client IP, only listens on a IPv4 address.</dd>
<dt><a href="//$domain_v6/ip">$domain_v6/ip</a></dt>
<dd>shows client IP, only listens on a IPv6 address.</dd>
</dl>
<h2>HTTP status codes</h2>
EOF
show_category "Informational" 1xx
show_category "Successful" 2xx
show_category "Redirection" 3xx
show_category "Client Error" 4xx
show_category "Server Error" 5xx
cat - <<EOF
</body>
</html>
EOF