#!/bin/sh
# Finger protocol adapter for Chawan. Requires curl.
# (It does *not* work without the environment variables MAPPED_URI_*, so no
# w3m support.)
#
# Usage: put this script in your cgi-bin folder, then add the following line to
# your urimethodmap:
#
# finger: /cgi-bin/cha-finger
#
# Note: the Chawan default configuration already does this, so normally you
# don't need to do anything to use the finger protocol.

# Check for errors.
die() {
	echo "Cha-Control: ConnectionError $1 $2"
	exit 1
}

type curl >/dev/null || \
	die 1 "curl must be installed on your computer to use finger"

PORT="${MAPPED_URI_PORT:-79}"
test "$PORT" = 79 || die 3 "invalid port; only port 79 is supported"

# Parse the URL. Roughly based on Lynx finger URL parsing, but less
# sophisticated.
if test -n "$MAPPED_URI_USERNAME"
then	USER="$MAPPED_URI_USERNAME"
else	case "$MAPPED_URI_PATH" in
	/w*) USER="/w ${MAPPED_URI_PATH#/w}" ;;
	*) USER="${MAPPED_URI_PATH#/}" ;;
	esac
fi
URL="telnet://$MAPPED_URI_HOST:$PORT"

# Headers.
printf 'Content-Type: text/plain\n'
# Newline; from here on we are sending the content body.
printf '\n'
# Finger request, the output of which goes to stdout.
printf '%s\r\n' "$USER" | if test -n "$ALL_PROXY"
then	curl -x "$ALL_PROXY" -- "$URL"
else	curl -- "$URL"
fi 2>/dev/null