#geek_comic #fun

In MongoDB you can use $regex in order to find something based on a regex pattern:

my_col.find({'name': { $regex: '^ali.*' } })

It will find all users that their names start with ali. Now let's say you want to search users based on their phone country code which has a + in its number like +98901.... You need to escape the + character but escape it twice:

my_col.find({'phone': { $regex: '^\\+98.*' } })

#mongoDB #pymongo #regex

marshmallow is an ORM/ODM/framework-agnostic library for converting complex datatypes, such as objects, to and from native Python datatypes.

- https://pypi.org/project/marshmallow/

#python #marshmallow #ORM #ODM

How to emulate text justification in monospace font? You will be given a single-lined text and the expected justification width. The longest word will never be greater than this width.

Here are the rules:

Use spaces to fill in the gaps between words.
Each line should contain as many words as possible.
Use '\n' to separate lines.
Gap between words can't differ by more than one space.
Lines should end with a word not a space.
'\n' is not included in the length of a line.
Large gaps go first, then smaller ones ('Lorem--ipsum--dolor--sit-amet,' (2, 2, 2, 1 spaces)).
Last line should not be justified, use only one space between words.
Last line should not contain '\n'
Strings with one word do not need gaps ('somelongword\n').
Example with width=30:

Lorem  ipsum  dolor  sit amet,
consectetur  adipiscing  elit.
Vestibulum    sagittis   dolor
mauris,  at  elementum  ligula
tempor  eget.  In quis rhoncus
nunc,  at  aliquet orci. Fusce
at   dolor   sit   amet  felis
suscipit   tristique.   Nam  a
imperdiet   tellus.  Nulla  eu
vestibulum    urna.    Vivamus
tincidunt  suscipit  enim, nec
ultrices   nisi  volutpat  ac.
Maecenas   sit   amet  lacinia
arcu,  non dictum justo. Donec
sed  quam  vel  risus faucibus
euismod.  Suspendisse  rhoncus
rhoncus  felis  at  fermentum.
Donec lorem magna, ultricies a
nunc    sit    amet,   blandit
fringilla  nunc. In vestibulum
velit    ac    felis   rhoncus
pellentesque. Mauris at tellus
enim.  Aliquam eleifend tempus
dapibus. Pellentesque commodo,
nisi    sit   amet   hendrerit
fringilla,   ante  odio  porta
lacus,   ut   elementum  justo
nulla et dolor.

Also you can always take a look at how justification works in your text editor or directly in HTML (css: text-align: justify).


#python #codewars

Object serialization deserialization ORM/ODM documentation

https://marshmallow.readthedocs.io/en/2.x-line/quickstart.html#serializing-objects-dumping

#python #marshmallow #ORM #ODM #readthedocs

https://haveibeenpwned.com/

Check if your email address has been breached

#haveibeenpwned

https://www.youtube.com/watch?v=XMu0T6L2KRQ&list=PLEsfXFp6DpzTOcOVdZF-th7BS_GYGguAS

#python #django #rest

https://github.com/LogRocket/redux-logger

#github #redux #react

How 3rd Party Logins work like Facebook, Google, etc?

In order to understand this concept you need to read a little bit about OAuth 2.0 flow. The flow that frontiers use in order to get access token is called Implicit Flow in this scenario in one go you get an access token and you don't need to send your client secret as everything in web is plain and end users can inspect it.

For example for Google authentication, you use the below link with resopnse_type of token NOT code (code is a 2-step authentication flow):

- https://accounts.google.com/o/oauth2/v2/auth?client_id=YOUR_CLIENT_ID&redirect_uri=https://example.com/callback. html&response_type=token&scope=openid+profile+email&prompt=select_account

But there are lot more going on in the background. How a modal is opened? Or when modal get the token how it sends access token to the main window (parent window)? How do you close the opened modal after successful authorization?

These are all critical questions that any frontier programmer needs to know.

One the simplest forms of opening a popup is:

window.popUpObj = window.open(url, '_blank')

We store the popup object in window.popUpObj in order to be able to close it in the future. As we just said in google link above we have a parameter called redirect_uri, here you put a link to where you need to get the parameters from your 3rd party. Here we have set it to:

- https://example.com/callback.html

Inside of that HTML you get the parameters. Google sends data in a hash section of the URL so in callback.html we get the hash like below and then send it to the parent window using window.opener:

<script>
     window.opener.loginCallback(window.location.hash);
 </script>

Here get the hash part using window.location.hash and pass it to parent window function loginCallback. This function is defined in your main js file like below:

window.loginCallback = function(args) {
     console.log('Login callback has been called, token: ', args);
     window.popUpObj.close();
 }

We get the hash part as args and then close the child window using window.popUpObj.close(). This is the object we have recently stored to refer later.

#javascript #google #3rd_party_login #login #facebook #oauth #oauth2 #implicit_flow

A more detailed example of a sample modal is like:

window.popUpObj = window.open(url, '_blank', 'toolbar=0,status=0,resizable=0,location=0,menuBar=0,scrollbars=yes, width=' + w + ',     height=' + h + ', top=' + top + ', left=' + left);

#javascript #modal #popup

Read a little bit more about Implicit Flow here:

- https://developer.okta.com/authentication-guide/implementing-authentication/implicit

#oauth #oauth2 #implicit_flow

Facebook implicit flow example:
- https://dzone.com/articles/oauth2-implicit-grant-flow-example-using-facebook

#oauth #facebook #implicit_flow

https://www.confluent.io/blog/beginners-perspective-kafka-streams-building-real-time-walkthrough-detection?mkt_tok=eyJpIjoiTXpoak1USTRZVEF5TjJKayIsInQiOiIxb2dDdEpJallUVzhPeWF6T3I3NXBtNHFqYVh1V0xGa3hONHlKQ2ptc0JtVzFLXC8rbHQxVys5MWprQjNWZGpLUGR2N2hkS0poakNRdURhb0pndjd2QXVYOEtYbjczSFdRVGVSUHhGelVHXC9QT0t5QXNsYUdwSlgyN0ZcL3NjQmpkeSJ9

#kafka #streams #kafka_streams

In case you want to run Selenium tests you need to run xvfb to have X virtual framebuffer (in-memory display server) you need to install it and then have script like below to run your Selenium test:

#!/bin/bash
 Xvfb :10 -ac &
 xvfb_pid=$!
 export DISPLAY=:10
 python -u test_login.py & >> /var/log/test_login.log
 kill ${xvfb_pid}

In case you need to run browser in headless mode you need to install xvfb

#selenium #xvfb

Backup mysql database and gzip 9 it:

mysqldump -u $user -h $host --port=$port --password=$password $db_name | gzip -9 > "$backup_file_name"

#mysql #backup #gzip9

CodeMirror is a versatile text editor implemented in JavaScript for the browser. It is specialized for editing code, and comes with a number of language modes and addons that implement more advanced editing functionality.


- https://codemirror.net/

We ourselves have used it for json prettifier in our internal tools.

#js #javascript

Heading to Zoodroom, wish me luck 😍
#job #python