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#!/bin/sh
# Adapter for the spartan protocol. See: spartan://mozz.us
# Requires netcat (nc).
#
# Usage: add the following line to your urimethodmap:
#
# spartan: /cgi-bin/spartan.cgi
if ! type nc >/dev/null 2>/dev/null
then printf 'Cha-Control: ConnectionError 1 nc not found\n'
exit 1
fi
MAPPED_URI_PORT=${MAPPED_URI_PORT:=300} # default port is 300
MAPPED_URI_PATH=${MAPPED_URI_PATH:=/} # needs / for root
if test "$REQUEST_METHOD" != POST && test "$MAPPED_URI_QUERY" = "input"
then printf "Content-Type: text/html
<!DOCTYPE html>
<form method=POST action=\"$MAPPED_URI_PATH\">
Input text to upload:
<p>
<textarea name=q></textarea>
<p>
<input type=submit>
</form>"
exit 0
fi
CONTENT_LENGTH=${CONTENT_LENGTH:+$(($CONTENT_LENGTH - 2))} # skip q=
CONTENT_LENGTH=${CONTENT_LENGTH:=0} # if missing, set to 0
{
printf '%s %d\n' "$MAPPED_URI_HOST $MAPPED_URI_PATH" "$CONTENT_LENGTH"
tail -c+3 # skip q=
} | nc "$MAPPED_URI_HOST" "$MAPPED_URI_PORT" 2>/dev/null | {
IFS= read -r line
case $line in
'2 '*) ctype=${line#2 }
printf "Content-Type: %s\n\n" "$ctype"
# Spartan does something very rude by extending text/gemini
# for the spartan protocol only. Horrible hack to make it work:
test "${ctype%
}" = "text/gemini" &&
sed 's/^=: \([^ ]*\)/=> \1?input/' || cat ;;
'3 '*) printf "Status: 301\nLocation: %s\n" "${line#3 }" ;;
'4 '*) printf "Status: 403\n\n%s" "${line#4 }" ;;
'5 '*) printf "Status: 500\n\n%s" "${line#5 }" ;;
*) printf "Cha-Control: ConnectionError 1 malformed response\n"
esac
}
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