#! /bin/ash
#Set your hostname after this variable
readonly PATH=/usr/lib/restricted/bin
readonly fqdn=gopher.zcrayfish.soy
oldfqdn=zcrayfish.dyndns.org
error301 () {
printf '%s\15\12' "HTTP/1.0 301 Moved Permanently" \
"Location: https://$fqdn$REQUEST_URI" \
"Content-Type: text/plain" \
"Server: gopher to http gateway at $fqdn" \
"" \
"HTTP/1.0 301 Moved permanently" \
"http://$oldfqdn$REQUEST_URI" \
"Might be found at:" \
"https://$fqdn$REQUEST_URI" \
"" \
"gopher to http gateway at $fqdn"
}
# Gather request and sanitise, not sure if needed now that we're running under lighttpd
filename="$(printf "%s" "$REQUEST_URI" | sed -e 's/%2c/,/gI' -e 's/%20/ /g')"
#old FQDN? Redirect them!
zdo=$(echo "$HTTP_HOST" | grep -i zcrayfish.dyndns.org)
test ! -z "$zdo" && error301 && exit
#Step4
case "$filename" in
/7*httpsearch*)
printf '%s\15\12' 'HTTP/1.0 200 OK' \
'Content-Type: text/html' \
"Server: gopher to http gateway at $fqdn" \
'' \
'<!DOCTYPE HTML PUBLIC "ISO/IEC 15445:2000//DTD HyperText Markup Language//EN">'
searchytwothousand="$(printf $filename | sed 's/httpsearch=//g')"
lynx -anonymous -dump -source "gopher://$fqdn:70$searchytwothousand" | \
tidyp -in -w 0 -cn --doctype omit --show-errors 0 --show-warnings 0 --quiet 1 --uppercase-tags 1 --uppercase-attributes 1 --char-encoding utf8 | \
sed -e 's/<A HREF="\/\//<A HREF="gopher:\/\//g' -e 's/<A HREF="gopher:\/\/'$fqdn':70/<A HREF="\/\/'$fqdn'/g' -e '/<HEAD>/a <LINK REL="STYLESHEET" HREF="//gopher.zcrayfish.soy/stylesheet.css">\n<LINK REL="SHORTCUT ICON" HREF="//gopher.zcrayfish.soy/favicon.ico">'
;;
/7*)
printf '%s\15\12' "HTTP/1.0 200 OK" \
"Content-Type: text/html" \
"Server: gopher to http gateway at $fqdn" \
"" \
'<!DOCTYPE HTML PUBLIC "ISO/IEC 15445:2000//DTD HyperText Markup Language//EN">' \
'<HTML><HEAD><TITLE></TITLE><LINK REL="STYLESHEET" HREF="//gopher.zcrayfish.soy/stylesheet.css">' \
'<LINK REL="SHORTCUT ICON" HREF="//gopher.zcrayfish.soy/favicon.ico"></HEAD><BODY>' \
'<P>This is a searchable gopher index. Enter search keywords below<BR>' \
"<FORM ACTION='$filename' METHOD='GET'><P><TEXTAREA ROWS='10' COLS='72' NAME='httpsearch'></TEXTAREA><BR><INPUT TYPE='submit'></P></FORM>" \
'</BODY></HTML>'
# "<FORM ACTION='$fqdn$filename' METHOD='GET'>" \
# '<P>This is a searchable gopher index. Enter search keywords below<BR><INPUT TYPE="TEXT" NAME="httpsearch"></P></FORM>' \
;;
# /debug*)
# printf '%s\15\12' "HTTP/1.0 200 OK" \
# "Content-Type: text/plain" \
# ""
# set
# ;;
###START OF DUMB / NON-INTELLIGENT GOPHER TYPES###
/[04569IMPdghps]*)
case "$filename" in
/0*)
mimetype="Content-Type: text/plain"
;;
/4*)
mimetype="Content-Type: application/mac-binhex40"
;;
/5*)
mimetype="Content-Type: application/octet-stream"
;;
/6*)
mimetype="Content-Type: message/rfc822"
;;
/9*)
mimetype="Content-Type: application/octet-stream"
;;
/I*.webp)
mimetype="Content-Type: image/webp"
;;
/I*)
mimetype="Content-Type: image/jpeg"
;;
/M*)
mimetype="Content-Type: message/rfc822"
;;
/P*)
mimetype="Content-Type: application/pdf"
;;
/d*)
mimetype="Content-Type: application/octet-stream"
;;
/g*)
mimetype="Content-Type: image/gif"
;;
/h*)
mimetype="Content-Type: text/html"
;;
/p*)
mimetype="Content-Type: image/png"
;;
/s*)
mimetype="Content-Type: application/octet-stream"
;;
esac
xyzzy="$(curl -q --disable -s --output - "gopher://$fqdn:70$filename" | base64)"
isdumb="true"
;;
###END OF DUMB / NON-INTELLIGENT GOPHER TYPES###
*)
#Store lynx output for future processing
xyzzy="$(lynx -anonymous -dump -source "gopher://$fqdn:70$filename" | \
tidyp -in -w 0 --doctype omit --show-errors 0 --show-warnings 0 --quiet 1 --uppercase-tags 1 --uppercase-attributes 1 --char-encoding utf8 | \
sed -e 's/<A HREF="\/\//<A HREF="gopher:\/\//g' -e 's/<A HREF="gopher:\/\/'$fqdn':70/<A HREF="/g' -f /srv/www/htdocs/head.sed -f /srv/www/htdocs/images.sed )"
if [ "$mimetype" = "" ]; then
mimetype="Content-Type: text/html"
fi
;;
esac
###OUTPUT SECTION###
#We'll use the output of Lynx or curl to determine if gopher content is 404d
#Non gophermap content may be binary, base64 it so the shell can deal with it
if [ "$isdumb" = "true" ] ; then
precontent=$(echo "$xyzzy" | base64 -d)
else
#precontent=$(echo "$xyzzy" | sed -n 's/.*<PRE>\(.*\)<\/PRE>.*/\1/p')
precontent=$(echo "$xyzzy" | xargs -s 633 | grep -E -o "<PRE>.*?</PRE>")
fi
#See if there's an error
is403=$(echo "$precontent" | head -n1 | grep "Error: Access denied!")
is404=$(echo "$precontent" | head -n1 | grep "Error: File or directory not found!")
#Respond to any errors
if [ -n "$is403" ] ; then
printf '%s\15\12' 'HTTP/1.0 403 Forbidden' && iserror="true"
fi
if [ -n "$is404" ] ; then
printf '%s\15\12' 'HTTP/1.0 404 Not Found' && iserror="true"
fi
if [ -n "$iserror" ] ; then
if [ "$isdumb" = "true" ] ; then
printf '%s\15\12' "Content-Type: text/plain" \
'%s\15\12' "Server: gopher to http gateway at $fqdn" \
'' \
"$precontent"
else
printf '%s\15\12' "Content-Type: text/html" \
'%s\15\12' "Server: gopher to http gateway at $fqdn" \
'' \
'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">' \
"$xyzzy"
fi
exit
fi
#If no errors, then we go here
printf '%s\15\12' 'HTTP/1.0 200 OK' \
"$mimetype" \
"Server: gopher to http gateway at $fqdn" \
''
if [ "$mimetype" = "Content-Type: text/html" ]; then
echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">'
fi
if [ "$isdumb" = "true" ] ; then
echo "$xyzzy" | base64 -d
else
echo "$xyzzy"
fi
echo ""