Computer Networksis an important topic and to understand the concepts, practical application of the concepts is needed. In this particular article, we will see how to make a simplefile-sharing app using Python.  AnHTTP Web Server is software that understandsURLs(web address) andHTTP(the protocol used to view webpages). Python has several packages which is a collection of modules. And it has several built-in servers. The modules used in this project are:

• TheHTTPServeris asocketserver, which creates and listens at the HTTP socket.
• Thesocketserver modules simplify the task of writing network servers.
• Thewebbrowser module provides us with a high-level interface to allow and display Web-based documents, simply calling the open() function.
• Thepyqrcode module is used to generateQR Code in just two lines of code.
• OS module helps for interacting with the operating system. Used for opening files, manipulate paths, and read all lines in all the files on the command line.
• PyPNG allows PNG image files to be read and written using pure Python

Step-by-step Approach:

• Install third-party modules:

pip install pyqrcodepip install pypng

• Install the dependencies using pip install at the command line.
• Importing necessary modules:
  • http.server and socketserver: To host in the browser.
  • pyqrcode: To generate QRcode.
  • png: To convert the QRCode into a png file.
  • OS: To interact with the Operating system.
• Assign port and name of the user.
• Find Ip address of the PC and convert it to a QR code.
• Create the HTTP request.
• Display the QR code in browser.

Implementation of the above Approach:

# import necessary modules# for implementing the HTTP Web serversimporthttp.server# provides access to the BSD socket interfaceimportsocket# a framework for network serversimportsocketserver# to display a Web-based documents to usersimportwebbrowser# to generate qrcodeimportpyqrcodefrompyqrcodeimportQRCode# convert into png formatimportpng# to access operating system controlimportos# assigning the appropriate port valuePORT=8010# this finds the name of the computer useros.environ['USERPROFILE']# changing the directory to access the files desktop# with the help of os moduledesktop=os.path.join(os.path.join(os.environ['USERPROFILE']),'OneDrive')os.chdir(desktop)# creating a http requestHandler=http.server.SimpleHTTPRequestHandler# returns, host name of the system under# which Python interpreter is executedhostname=socket.gethostname()# finding the IP address of the PCs=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)s.connect(("8.8.8.8",80))IP="http://"+s.getsockname()[0]+":"+str(PORT)link=IP# converting the IP address into the form of a QRcode# with the help of pyqrcode module# converts the IP address into a Qrcodeurl=pyqrcode.create(link)# saves the Qrcode inform of svgurl.svg("myqr.svg",scale=8)# opens the Qrcode image in the web browserwebbrowser.open('myqr.svg')# Creating the HTTP request and  serving the# folder in the PORT 8010,and the pyqrcode is generated# continuous stream of data between client and serverwithsocketserver.TCPServer(("",PORT),Handler)ashttpd:print("serving at port",PORT)print("Type this in your Browser",IP)print("or Use the QRCode")httpd.serve_forever()

Output:

• Open the python file which has the above code on PC.
• This will generate a QR-code.

• Either Scan the QR-code or type the IP Address shown in the python shell in your mobile browser.

• Share the files with ease by scanning the QR-code that's generated and get access to the files in PC, from the mobile browser.

Demonstration:

Why Port 8010 ? 

TCP Port 8010 use a defined protocol to communicate depending on the application. A protocol is a set of formalized rules that explains how data is communicated over a network. This is secured and is not infected by Virus/Trojan.

Explanation:

• The code finds the name of the USERPROFILE throughOS module. And changes the directory to access the files on the desktop.
• Finds the hostname to serve the file in a particular port for secured sharing.
• Then finds the IP address of the system so that we can connect a particular device.
• The IP address is converted into the form of QR-code using the modulepyqrcode for easy use.
• The generated image is hosted in a web browser.
• Once the device connected to the same network either scanned QR code or type the IP address can access the files of the system.

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