Arthur

Pemberton

Full-stack web applications developer


Welcome to my blog

As I discover new things in my field and solve troublesome problems, I will attempt to document my finds here.

phpMyAdmin: Incorrect format parameter

June 20, 2018, Arthur Pemberton4 Comments

If you’re getting “Incorrect format parameter” errors on attempts to import files into phpMyAdmin, be sure to get your post_max_size and upload_max_filesize settings in php.ini. More than likely, they are too small for the file that you’re uploading.

Full page screenshots with Python and Selenium

December 18, 2017, Arthur Pemberton9 Comments

Currently, none of the major Selenium drivers (browsers) support the ability to easily take a screenshot of an entire web page. The following function takes multiple screenshots through the viewport and scrolls between screenshots, then stitches the resulting images into a single PNG.

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Calling openssl genrsa from Python

September 28, 2017, Arthur Pemberton0 Comments

I have been writing some automation code a few dozen websites, and I wanted to generate SSL keys, and I couldn’t get the `subprocess` call to work properly, so I thought I would post the final solution. The argument to `communicate()` is critical.
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Replicating Chilkat AES Cryptography with PyCrypto

November 22, 2016, Arthur Pemberton0 Comments

Today, I had the need to replicate an encrypted query string token to inter-operate with a third-party commercial application. I was able to determine the library, symmetrical algorithm and secret key being used to create the token. Turns out, it was an ASP.net web application using the Chilkat .NET library to do the encryption and decryption. Specifically, it was the Chilkat AES (aka Rijndael) methods being used.
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Openfire certificate import

September 27, 2016, Arthur Pemberton0 Comments

Working with SSL certificates in Openfire are surprisingly troublesome, at least as compared to popular web servers (Apache hTTPd, Nginx, IIS).

I recently needed to update an expiring certificate (having once, previously, figured out how to successfully import a purchased, SSL certificate.

This time I found a nice tutorial: https://alpha-labs.net/2014/12/openfire-and-ciphers/. Thanks to Christian for that.

I’ve made some slight modifications to his Shell script, and I just wanted to share:
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Adding version numbers to your static files

June 12, 2016, Arthur Pemberton0 Comments

When I started with Django, the version at the time was 1.5. Back then, we prepended STATIC_URL to our static assets to reference them in our templates. With recent release, best practice is to you use the static [1]. I often find myself wanting to append a version number to my static files, at least my CSS and JS files to ensure that browser see my new versions when I push an update. In this post, I make use of the `static` tag and its URL building to easily append a version number.

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