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#!/bin/bash
## Create the response FIFO
rm -f response
mkfifo response
function handle_GET_home() {
RESPONSE=$(cat home.html | \
sed "s/{{$COOKIE_NAME}}/$COOKIE_VALUE/")
}
function handle_GET_login() {
RESPONSE=$(cat login.html)
}
function handle_POST_login() {
RESPONSE=$(cat post-login.http | \
sed "s/{{cookie_name}}/$INPUT_NAME/" | \
sed "s/{{cookie_value}}/$INPUT_VALUE/")
}
function handle_POST_logout() {
RESPONSE=$(cat post-logout.http | \
sed "s/{{cookie_name}}/$COOKIE_NAME/" | \
sed "s/{{cookie_value}}/$COOKIE_VALUE/")
}
function handle_not_found() {
RESPONSE=$(cat 404.html)
}
function handleRequest() {
## Read request
while read line; do
echo $line
trline=$(echo $line | tr -d '[\r\n]')
[ -z "$trline" ] && break
HEADLINE_REGEX='(.*?)\s(.*?)\sHTTP.*?'
[[ "$trline" =~ $HEADLINE_REGEX ]] &&
REQUEST=$(echo $trline | sed -E "s/$HEADLINE_REGEX/\1 \2/")
CONTENT_LENGTH_REGEX='Content-Length:\s(.*?)'
[[ "$trline" =~ $CONTENT_LENGTH_REGEX ]] &&
CONTENT_LENGTH=$(echo $trline | sed -E "s/$CONTENT_LENGTH_REGEX/\1/")
COOKIE_REGEX='Cookie:\s(.*?)\=(.*?).*?'
[[ "$trline" =~ $COOKIE_REGEX ]] &&
read COOKIE_NAME COOKIE_VALUE <<< $(echo $trline | sed -E "s/$COOKIE_REGEX/\1 \2/")
done
## Read body
if [ ! -z "$CONTENT_LENGTH" ]; then
BODY_REGEX='(.*?)=(.*?)'
while read -n$CONTENT_LENGTH -t1 line; do
echo $line
trline=`echo $line | tr -d '[\r\n]'`
[ -z "$trline" ] && break
read INPUT_NAME INPUT_VALUE <<< $(echo $trline | sed -E "s/$BODY_REGEX/\1 \2/")
done
fi
## Route to the response handlers
case "$REQUEST" in
"GET /login") handle_GET_login ;;
"GET /") handle_GET_home ;;
"POST /login") handle_POST_login ;;
"POST /logout") handle_POST_logout ;;
*) handle_not_found ;;
esac
echo -e "$RESPONSE" > response
}
echo 'Listening on 3000...'
## Keep server running forever
while true; do
## 1. wait for FIFO
## 2. creates a socket and listens to the port 3000
## 3. as soon as a request message arrives to the socket, pipes it to the handleRequest function
## 4. the handleRequest function processes the request message and routes it to the response handler, which writes to the FIFO
## 5. as soon as the FIFO receives a message, it's sent to the socket
## 6. closes the connection (`-N`), closes the socket and repeat the loop
cat response | nc -lN 3000 | handleRequest
done
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