Totally simple web server using Bash and netcat (nc)

tsws

#!/bin/bash

# --------------------------------
# Totally Simple Web Server (TSWS)
# --------------------------------
#
#  (c) 2015 Dave Fletcher
#  All Rights Reserved
#
#  This is free and unencumbered software released into the public domain.
#
#  Anyone is free to copy, modify, publish, use, compile, sell, or
#  distribute this software, either in source code form or as a compiled
#  binary, for any purpose, commercial or non-commercial, and by any
#  means.
#
#  In jurisdictions that recognize copyright laws, the author or authors
#  of this software dedicate any and all copyright interest in the
#  software to the public domain. We make this dedication for the benefit
#  of the public at large and to the detriment of our heirs and
#  successors. We intend this dedication to be an overt act of
#  relinquishment in perpetuity of all present and future rights to this
#  software under copyright law.

#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
#  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
#  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
#  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
#  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
#  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
#  OTHER DEALINGS IN THE SOFTWARE.
#
#  For more information, please refer to <http://unlicense.org>
#

# We use this to print to the terminal when the context
# of STDOUT is something other than the pty.
declare -r TTY="$(tty)"

# -----------------------------------------------------------------------------
# tsws [addr [, port]]
# -----------------------------------------------------------------------------
#
# Start the Totally Simple Web Server.
#
# ---------
# Arguments
# ---------
#
#    - addr: IP address (or hostname) to listen on. Optional. If not
#            supplied the default value is 127.0.0.1
#
#    - port: Port to listen on. Optional. If not supplied the default
#            value is 18080
#
# -------------
# Example usage
# -------------
#
#  # Launch the webserver. This version will not return, it will loop forever.
#  tsws localhost 8080
#  
#  # Alternatively, launch the webserver and return immediately.
#  tsws localhost 8080 &
#  # Catch the PID so we can wait or kill later.
#  declare tsws_pid=$!
#  # Launch a browesr.
#  firefox "http://localhost:8080"
#  # Done with other processing, join webserver.
#  wait ${tsws_pid}
#
#
# -------------------
# Theory of operation
# -------------------
#
# The nc program opens a network port and begins listening. When an inbound
# connection is made, the STDOUT of nc is pushed to a FIFO pipe. The
# _tsws_response function runs concurrently and waits for input from the FIFO
# pipe. When _tsws_response finds an HTTP request there, it processes and
# returns a well-formed HTTP response back to nc STDIN. nc sends this
# response back to the requesting client.
#
# --------------------------------------------------------------------------
#
#                                        +----+ (1)
#       Browser <===> The Internet <===> | nc | ---> FIFO pipe ---+
#                                        +----+                   |
#                                       (0) ^                     |
#                                           |                     |
#                                           +-- _tsws_response <--+
#
#    - 1: STDOUT of `nc` process which carries HTTP requests.
#    - 0: STDIN of `nc` process which carries HTTP responses.
#    - _tsws_response: handler function reads requests, produces responses.
#
# --------------------------------------------------------------------------
#                                               Diagram: Theory of operation
#
# This model almost certainly has issues with concurrency. It is useful for
# a single local user or demonstration purposes, but please do not use it
# as a production web server connected to the internet.
#
# ------------
# Requirements
# ------------
#
#             - nc (netcat) handles the network listen call for us and binds
#               stdin and stdout of the nc process to connected clients.
#
#             - mkfifo: A FIFO pipe connects the output of nc to our
#               _tsws_response function which processes requests and sends
#               responses back through stdin of nc to browser client.
#
#             - wc -c: For calculating Content-Length.
#
#             - cat, tee: For pushing files and HTTP data through pipes.
#
function tsws {
  [ -z "$1" ] && local -r addr='127.0.0.1' || local -r addr="$1"
  [ -z "$2" ] && local -r port=18080 || local -r port="$2"
  local -r fifo="$(mktemp -u)"
  mkfifo -m 600 "${fifo}"
  trap "rm ${fifo}" EXIT INT TERM HUP
  nc -kl "${addr}" ${port} \
    0< <(_tsws_response "${fifo}") \
    1> >(while : ; do cat - > "${fifo}"; done) # Loop keeps pipe open.
}

# -----------------------------------------------------------------------------
# _tsws_response(fifo)
# -----------------------------------------------------------------------------
#
# Internal workhorse function for handling requests and responses for tsws.
# Do not call it directly.
#
function _tsws_response {
  local method path httpvers callback content_type
  local isfunc obf status msg
  method=""
  while : ; do # Run forever.
    while read -r line; do
      line="$(sed 's/\r//g' <<< "${line}")" # Replace CRLF with /n
      if [ -n "${line}" ]; then
        # ${line} is not empty, it is either a "Request-Line" or a header
        # line. If we have no 'method' yet we assume it is a Request-Line.
        # http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html
        if [ -z "${method}" ]; then
          read -r method path httpvers <<< "${line}"
          continue
        fi
        # TODO: if we cared about any of the request headers, here is the
        # place to read them by parsing ${line}.
      else
        # ${line} is empty, so we received two consecutive CRLF.
        # Process the request.
        #
        # Currently all "files" served up by the server are functions in this
        # script that return content. This shows how dynamic content can be
        # served and keeps this example all in one single file. It should be
        # easy to adapt this to also read real files from disk Hint: obf below
        # and use `file` to get content_type.
        callback="www$(sed -e 's/\//_/g' -e 's/\./_/g' <<< "${path}")"
        [ "${callback}" = "www_" ] && callback="www_index"
        content_type="${callback}_Content_Type"
        content_type="${!content_type}"
        [ -z "${content_type}" ] && content_type="text/plain"
        obf="$(mktemp -u)"
        case "${method:?}" in
          GET)
            local -f  "${callback}" > /dev/null
            isfunc=$(( ! $? ))
            if [ ${isfunc} = 1 ]; then
              status=200; msg="OK"
              ${callback} > "${obf}"
            else
              status=404; msg="Not Found"
              printf $'Not found: %s.' "${path}" > "${obf}"
            fi
          ;;
          *)
            status=500; msg="Internal Server Error"
            printf $'Server Error: unknown method %s.' "${method}" > "${obf}"
          ;;
        esac
        # Show request in term.
        printf $'%s %s\n' "${method}" "${path}" >${TTY}
        # Output headers, tee shows the response headers in term.
        printf $'HTTP/1.1 %s %s\r\n' "${status:?}" "${msg:?}" | tee ${TTY}
        printf $'Content-Length: %s\r\n' "$(cat "${obf}"|wc -c)" | tee ${TTY}
        printf $'Content-Type: %s\r\n' "${content_type}" | tee ${TTY}
        printf $'Connection: close\r\n' | tee ${TTY}
        printf $'\r\n' | tee ${TTY}
        # Output the response data.
        cat "${obf}"
        rm "${obf}"
        method=""
      fi
    done < "$1"
  done
}


# +---------------------------------------------------------------------------+
# |                                  WWW FILES                                |
# +---------------------------------------------------------------------------+

declare www_index_Content_Type="text/html; charset=utf-8"
function www_index {
cat <<EOF
<!DOCTYPE html>
<html>
  <head>
    <title>Totally Simple Web Server</title>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <script type="text/javascript" src="/site.js"></script>
    <style type="text/css">@import url("/style.css");</style>
  </head>
  <body>
      <a href="https://gist.github.com/dfletcher/4763be3295bd5638b797" title="Fork me on GitHub"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/e7bbb0521b397edbd5fe43e7f760759336b5e05f/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f677265656e5f3030373230302e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_green_007200.png"></a>
      <img class="graphic" src="/graphic.jpg" />
      <h1>Totally Simple Web Server</h1>
      <b>&copy; 2015 Dave Fletcher</b><br>
      All rights reserved</em><br>
      <p><em>A web server in <a href="https://www.gnu.org/software/bash/">Bash</a> and <a href="http://nc110.sourceforge.net/">Netcat</a>.</em></p>
      <b>$(date)</b><br><br>
      status: ${status}<br>
      statusmsg: ${msg}<br>
      method: ${method}<br>
      path: ${path}<br>
      httpvers: ${httpvers}<br>
      callback: ${callback}<br>
  </body>
</html>
EOF
}

declare www_style_css_Content_Type="text/css"
function www_style_css {
cat <<\EOF

@import url(//fonts.googleapis.com/css?family=Lato:400,700,400italic);

BODY {
  font-family: 'Lato', sans-serif;
  margin: 10%;
}

.graphic {
  float: right;
  margin-left: 2em;
}

EOF
}

declare www_site_js_Content_Type="text/javascript"
function www_site_js {
cat <<\EOF
(function ($) {
  //$(document).ready(function() { alert('hi!'); });
}(jQuery));
EOF
}

declare www_graphic_jpg_Content_Type="image/jpeg"
function www_graphic_jpg {
# Note: The base64 here is is just to show how a binary file could be
# returned from a Bash function. As a different type of example, this could
# be the output of ImageMagick instead of a hard-coded base64 jpeg.
base64 -d <<\EOF
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AAAAAAAAAQIDBAUG/8QAKxEBAAICAgIBBAEFAAMBAAAAAAECAxEhMQQSQRMiMlFhBRQjQnEzUoGR
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EOF
}


# +---------------------------------------------------------------------------+
# |                                    Main                                   |
# +---------------------------------------------------------------------------+

[ -n "$1" ] && addr="$1" || addr="127.0.0.1"
[ -n "$2" ] && port="$2" || port=18080
tsws "${addr}" "${port}"