make-trivial-rule

#!/bin/sh

# THIS IS NOT A RULE, but a shell script to create simple rules for a
# specified domain.
#
# Create $1.xml, mapping $1 and www.$1 to https://$2 (or simply http:
# to https: by default).

if [ -z "$1" ]
then
  echo "syntax: $0 example.com [secure.example.com]" >&2
  exit 1
fi

capitalized=$(echo "$1" | cut -c 1 | tr a-z A-Z)$(echo "$1" | cut -c 2-)
dest="$capitalized".xml
if [ -f "$dest" ]
then
  echo "error: $dest already exists." >&2
  exit 1
fi

if echo "$1" | grep -i '^www' >/dev/null
then
  echo "error: omit leading www" >&2
  exit 1
fi

if echo "$1" | grep -v '\.' >/dev/null
then
  echo "error: domain should probably contain a dot" >&2
  exit 1
fi

lower=$(echo "$1" | tr A-Z a-z)
escaped=$(echo "$lower" | sed 's/\./\\./g' )

duplicate=$(find . -name '*.xml' -exec grep -EHin '<target\s+host="(w+\.)?'$escaped'"\s*/>' -- {} +)
if [ -n "$duplicate" ]
then
  echo "error: $lower already exists:" >&2
  echo "$duplicate" >&2
  exit 1
fi

if [ "$#" -gt 1 ] ; then
    to="$2"
else
    to="www.$lower"
fi

cat > "$dest" <<END
<!--
Note to ruleset creator: if you are aware of any nonfunctional hosts relevant
to this ruleset, please list them below, replacing the example.

Alternatively, if you are unaware of any such hosts, please delete this comment
in its entirety.

	Nonfunctional hosts in *.$lower:
		# Example: foobar.$lower (m)

	h: http redirect
	m: certificate mismatch
	r: connection refused
	s: self-signed certificate
	t: timeout on https
-->
<ruleset name="$capitalized">
	<target host="$lower" />
	<target host="www.$lower" />

	<rule from="^http:" to="https:" />
</ruleset>
END

echo "$0: created $dest; please examine it." >&2