cowsay Flask webserver example

#!/bin/bash

apt-get install python3-pip net-tools nano cowsay
pip3 install Flask==1.0.2

cat << EOF > /opt/cowsay.py
import sys
import os.path
import subprocess


from flask import Flask
from flask import request

localport = 8000
localhost = "0.0.0.0"

app = Flask(__name__)


#http://0.0.0.0:8000/?text=My%20Text
@app.route("/", methods=['GET'])
def root():
    myexec = "/usr/games/cowsay"
    mytext = request.args.get('text', default = "Hello World", type = str)
    try:
        process = subprocess.Popen([myexec, mytext], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
        myimg =  process.communicate()[0]
        myimg = myimg.decode("utf-8")
    except:
        myimg = ""
    myhtml = "<pre>"+myimg.replace("\n", "</br>")+"</pre>"
    return myhtml



if __name__ == "__main__":
    app.run(debug=True, host=localhost, port=localport)
EOF

chmod 755 /opt/cowsay.py

cat << EOF > /lib/systemd/system/cowsay.service
[Unit]
Description=Simple webserver that prints Cowsay
[Service]
ExecStart=python3 /opt/cowsay.py
StandardOutput=null
#Uncomment:
#User=cowsay
#Group=users
#if you want to run script as a different user than root
[Install]
WantedBy=multi-user.target
Alias=cowsay.service
EOF




systemctl enable cowsay.service
systemctl start cowsay.service