Category Archives: IT

Filtering out outliers in Arduino ultrasonic distance sensor data

A friend of mine asked me how he could remove invalid data points from the measurements made by the ultrasonic range finder in his Arduino project. A quick search got me to this page, but some of the links were … Continue reading

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Nginx as origin for S3 with authentication, with CDN on top

We recently had a small problem with our content delivery system. The setup is as follows: – AWS S3 bucket that requires authentication – EC2 instance, running Nginx with ngx_aws_auth – ELB load balancer in front of the EC2 instance … Continue reading

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Nginx: Reject request if header is not present

It was surprisingly difficult to find a full working example of this, so here’s my take on “How to make Nginx require that a certain header is present with a certain value in the incoming request”: nginx.conf: http { map … Continue reading

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WordPress 4.0 not vulnerable

Related to my previous post, I emailed WordPress lead developers about the vulnerability, and got this response from Andrew Nacin: We’re aware of the report and have been investigating. If you are running the latest version of WordPress (4.0), you … Continue reading

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Comments disabled due to WordPress vulnerability

UPDATE 2014-11-10: WP 4.0 is not vulnerable. The commenting feature on this blog has been temporarily disabled (using the Disable Comments-plugin) due to an apparently discovered vulnerability in all current versions of WordPress. The details of the vulnerability have not … Continue reading

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OS X 10.10 Yosemite phones home

After OS X 10.10 Yosemite came out, a lot of people noticed the OS sending private information to Apple’s servers without the user’s consent. I haven’t updated to Yosemite yet, and I might not update at all, largely because of … Continue reading

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Whiskygate

This has been discussed online at length, so I won’t go into details. In short, Finland’s State Regional Administration Agency (Avi) told the organizers of the “Beer and Whisky Expo” that if Google searches for “whisky” return links to their … Continue reading

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Launching Newsbeuter from the Dock

There are plenty of RSS readers out there, but I just found one that fits my minimalistic CLI needs like a glove: Newsbeuter. It’s available for OS X via Homebrew (as well as multiple flavours of Linux). Installing Newsbeuter wasn’t … Continue reading

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Creating Drupal 7 nodes with PHP via the restws API

Drupal 8 has a built-in REST API that allows programmatical access to all the entities on a site. Similar functionality has been implemented for Drupal 7, in the RESTful Web Services (restws) module. In project I’m working on, in preparation … Continue reading

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Pythagoras calculator update

A commenter suggested that I add a visualization of the triangle being calculated to my Pythagoran theorem calculator. Adding that was just a few more lines of code using the canvas-element, so here’s the updated version (direct link to the … Continue reading

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