From 354616cc3536d7f0c58795373192f6b1e5a1cb0b Mon Sep 17 00:00:00 2001
From: dan <me@danrh.co.uk>
Date: Sun, 28 May 2023 16:02:50 -0400
Subject: feat: shell script http server

---
 http-server.sh | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 http-server.sh

(limited to 'http-server.sh')

diff --git a/http-server.sh b/http-server.sh
new file mode 100644
index 0000000..aa5e17e
--- /dev/null
+++ b/http-server.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+# Simple HTTP Server using Netcat (nc)
+#
+# Sends a greeting message and the date in the response.
+
+
+# Info: Relies on the OpenBSD version of Netcat
+#       GNU netcat may or may not work.
+
+# Creating a FIFO so that the output of nc can be processed and used to determine the input.
+# Allows for "passing values back round"
+outfifo="/tmp/outfifo"
+rm -f "$outfifo"
+mkfifo "$outfifo"
+
+# Run forever
+while true; do
+    x="$(date)"
+    len="$(echo "$x" | wc -c)"
+    cat "$outfifo" \
+        | nc -l localhost 1500 \
+        | while read -r line; do
+            line=$(echo "$line" | tr -d '\r\n')
+            echo "< $line"
+
+            if echo "$line" | grep -qE '^GET /'; then
+                # on reading the request line, extract a value from the request path and build the response
+                name="$(echo $line | sed 's:GET /\([^ ]*\).*:\1:')"
+                content="Hello $name, the date and time is $(date)."
+                # Without Content-Length header, connection will not close properly
+                len="$(echo "$content" | wc -c)"
+
+                response="HTTP/1.1 200 OK\nContent-Length: $len\nContent-Type: plain/text\n\n$content"
+            elif [ -z "$line" ]; then # end of request
+                # send response once all of the request has been read
+                echo -e "$response" > "$outfifo"
+            fi
+        done
+    done
-- 
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