better configuration

Dockerfile

@@ -20,18 +20,25 @@ EXPOSE 80
 
 WORKDIR /opt/websockify
 
-ENV LOCALPORT="80"
+ENV WSHOST="window.location.hostname"
+ENV WSPORT="80"
 ENV DEST="box.imzadi.de:23"
 ENV OPTS="--web /web"
 
 RUN cat <<'EOF' > /entrypoint.sh
 #!/bin/sh
-echo "Websockify"
-echo "----------"
-echo "Options    : $OPTS"
-echo "Local Port : $LOCALPORT"
-echo "Destination: $DEST"
-/usr/local/bin/websockify $OPTS $LOCALPORT $DEST
+echo "Websockify Container"
+echo "--------------------"
+echo "Container Host : $WSHOST"
+echo "Container Port : $WSPORT"
+echo "Destination    : $DEST"
+echo "Options        : $OPTS"
+/usr/local/bin/websockify $OPTS 80 $DEST
+EOF
+
+RUN cat <<'EOF' > /web/config.js
+var wshost=$WSHOST;
+var wsport=$WSPORT;
 EOF
 
 RUN chmod +x /entrypoint.sh