Kafka

KAFKA is an open source developed by LinkedIn for data pipelining, data streaming, data processing, and data transferring with maximum throughput. It's managed by Apache.

We use Kafka on the AWS environment under Python and PHP technologies to manage a high volume of data to load in a fraction of a second.

Kafka helps in real-time data streaming, connecting to any sources like AWS S3, can be auto-scale and optimize data streams. Many big giants using Kafka.

Laravel Trottle AddHeaders Error

We sometimes face this error when new install Laravel and run composer udpate

 Type error: Argument 1 passed to Illuminate\\Routing\\Middleware\\ThrottleRequests::addHeaders()

must be an instance of Symfony\\Component\\HttpFoundation\\Response, null given

Solution:

For me, the issue is resolved by correcting database credentials in the .env file. Hope the same will work for

you as well.

Test Web Apps on all browsers online

Test Web Apps on different browsers online

Browserstack is the best solution to test website UI/UX on different browsers simulators at single place online.

Click here for more info:

https://www.browserstack.com/

I used this https://www.browserstack.com/ for my apps to test UI/UX and performance of my apps. We can get following browsers at one place:

1. Google Chrome - All Versions
2. IE - All Versions 
3. Safari - All Versions
4. Android - All Versions
5. IOS - All devices, All Versions
6. Opera browsers

Microsoft Graph API PHP

Microsoft Graph API PHP Tutorials

I am sharing some basic sample PHP code for Microsoft Graph API. May this will  helpful for someone.

For full reference, go to GIT URL:

https://github.com/microsoftgraph/msgraph-sdk-php

PHP Framework Laravel Sample Code GIT URL:

https://github.com/microsoftgraph/php-connect-sample

To start, you should have Outlook/Hotmail or any Microsoft Account.

First required to register App on Azure Active Directory. You can create App on Azure even if you have School or Organization account.

Graph API will generate Microsoft Authentication URL, where user will redirect and after successful login he will redirect back callback URL. Callback URL need to define in Azure App.

User can get Calendar events based on dates provided. User can create events on their Calendar.

Sharing Create Calendar Event using Microsoft Graph API.

<?php

// POST /me/events

$events_response = $graph->createRequest('POST', '/me/events')

    ->attachBody($newEvent)

    ->setReturnType(Model\Event::class)

    ->execute();

Get Calendar Events using Microsoft Graph API

<?php

$userEventsArr = $graph->createRequest('GET', $getEventsUrl)

// Add the user's timezone to the Prefer header

    ->addHeaders(array(

        'Prefer' => 'outlook.timezone="' . $userTimezone . '"',

    ))

    ->setReturnType(Model\Event::class)

    ->execute();

Calculate Number of Days PHP

Calculate Number of Working Days Between Two Days in PHP

I am sharing my PHP code to get difference between two dates.

$workingDays = 0;
$startTimestamp = strtotime('2021-06-03');
$endTimestamp = strtotime('2022-07-09');
for ($i = $startTimestamp; $i <= $endTimestamp; $i = $i + (60 * 60 * 24)) {
    if (date("N", $i) <= 5) $workingDays = $workingDays + 1;
}
echo "no. of days: " . $workingDays;

Save code in nofdays.php.

Run program in terminal. Output will be:

$ php nofdays.php

no. of days: 287

Digital E-sign Tool

Digital E-sign Tool

I have developed Digital E-Signature Tool to digital sign any PDF file. It's a developed in HTML5, JQuery technology and JSPDF library. JS Signature Pad library is also used. PHP script is also added to save the file on server. May be its helpful for someone.

User can drag signature at any place on the PDF document. User can upload signature as well.

    

Full code can be found at below Bitbucket URL:

sourabhgupta3838 / ws-esign — Bitbucket

First we load any PDF.  Then user click Add signature button. User can upload signature file as well. Once user draw or upload his signature, it will show in drag area on right side. User can drag that signature anywhere on the PDF file. Once user click Acceptance checkbox, as most of the sites ask for acceptance of policy or any agreement. Submit button becomes available. User can save signature file, email that or upload on server, developer has to write that script as per his requirements.

PDF file generation from HTML file in Python

PDF Generation from HTML File in Python

I am sharing my script to generate PDF file from HTML file in Python using PDFKit module.

Install Python PDF-Kit

$ pip install pdfkit

Some Simple Examples:

import pdfkit

pdfkit.from_url('http://testpage.com', 'out.pdf')
pdfkit.from_file('test.html', 'out.pdf')
pdfkit.from_string('Hello!', 'out.pdf')

My Sample Script to generate PDF from HTML page.

 import os
import sys
from flask import Flask,request
import pdfkit
from flask import make_response
import logging.config
app = Flask(__name__)
from decouple import config
# Logger and handlers
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'console': {
            'format': '%(levelname)-1s: %(asctime)s [%(name)-12s.%(funcName)s.%(lineno)s] %(message)s',
        },
        'file': {
            'format': '%(levelname)-1s: %(asctime)s [%(name)-12s.%(funcName)s.%(lineno)s] %(message)s',
        },
    },
    'handlers': {
        'console': {
            'level': "DEBUG",
            'class': 'logging.StreamHandler',
            'formatter': 'console',
            'stream': sys.stdout
        },
        'file': {
            'level': "DEBUG",
            'class': 'logging.handlers.RotatingFileHandler',
            'formatter': 'file',
            'filename': 'htmltopdf.log',
        },
    },
    'loggers': {
        '': {
            'handlers': ['file'],
            'level': "DEBUG",
            'propagate': True
        },
    }
}
logging.config.dictConfig(LOGGING)
LOGGER = logging.getLogger(__name__)

@app.route("/")
# Function for html to pdf convertor
def function_html_to_pdf_convertor():
    try:
        logging.debug("calling func")
        html_file = request.args.get('f', default="", type=str)
        if html_file:
            html_file = '{}{}'.format(html_file,'.html')
            filepath = os.path.join(app.static_folder, html_file)
            filename = os.path.splitext(os.path.basename(filepath))[0]
            css = "static/style.css"
            options = {
                'page-size': 'Letter',
                'encoding': "UTF-8",
                'zoom': 1.80,
                'footer-center': 'Page [page]/[topage]',
                'footer-font-size': 8
            }
            if os.path.isfile(filepath):
                #pdf = pdfkit.from_file(filepath, css=css)
                pdf = pdfkit.from_file(filepath, False,options=options, css=css)
                response = make_response(pdf)
                response.headers.set('Content-Disposition', 'attachment', filename=filename + '.pdf')
                response.headers.set('Content-Type', 'application/pdf')
                return response
            else:
                logging.debug("File not found")
                return {
                    "status": 404,
                    "message": 'File not found'
        }
        logging.debug("'Please provide file'")
        return{
            "status": 400,
            "message": 'Please provide file'
        }
    except Exception as e:
        logging.debug("Bad request {}".format(e))
        return {
            "status": 400,
            "error": '{}'.format(e)
        }
# main function
if __name__ == "__main__":
    app.run()