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Preview: James Crisp

James Crisp

Software dev, tech, mind hacks and the occasional personal bit

Last Build Date: Mon, 13 Nov 2017 06:08:36 +0000


Rails serving big password protected files – Capistrano Rsync & X-Sendfile

Thu, 09 Nov 2017 02:51:14 +0000

Say you’ve got a few app servers, and you want to serve up some largish files from your rails app (eg, pdfs) behind a login screen. Well, you could put them on s3 and redirect the user to s3 with expiring links. However, this would mean the eventual URL the user gets in their browser […]

BigDecimal fix for Rails 4 with Ruby 2.4

Tue, 26 Sep 2017 01:08:37 +0000

Rails 4.2.9 works well with Ruby 2.4.2 except for an incompatible change with invalid decimal values and String#to_d. BigDecimal was changed in 1.3.0 (which ships with Ruby 2.4) to throw an exception on invalid values passed to the constructor. This also impacted String#to_d and caused it to raise an exception when it didn’t previously. If […] vs Self Hosted WordPress

Tue, 05 Sep 2017 10:15:27 +0000

Previously, this blog was hosted on a Virtual Private Server (VPS) with Linode. No problem there, it worked for many years. However, the VPS has other uses, and this blog needed to move. looked like the most attractive option. Automatic updates, automatic backups, automatic CDN etc. So I exported my blog and imported […]

Solving Calendar Sync problems on Android 7 Nougat

Sat, 26 Aug 2017 07:49:30 +0000

Recently, the phone calendar on my Samsung Galaxy S6 stopped synchronising with Google calendar. When I went to Google Accounts Sync in Settings, Calendar had the spinner next to it, but it was didn’t spin. Meanwhile, the calendar didn’t sync, and the battery was being chewed through more quickly than usual. How to fix? Well […]

Talk: Winning at HTTPS

Tue, 18 Oct 2016 11:28:04 +0000

For the first time in a little while, I’ll be giving a talk at the Sydney ALT.NET user group: HTTPS is ever more pervasive, with few sites still using plain HTTP. Want to be the guy or girl on the team who actually understands HTTPS, can set up certificates and fix issues that come up? […]

Talk: Add a billion row data warehouse to your App.. with Redshift, sql and duct tape!

Mon, 16 Jun 2014 12:34:07 +0000

Come along to Sydney ALT.NET for a BIG data night. I’ll be giving a talk on Redshift: Started to hit the point where your transactional database is not the right place for running reporting queries and experimental data science? Keen to chuck in more data from web logs, CRMs, facebook, etc so you can start […]

Moving to HTTPS, Rails force_ssl and Rollback

Sun, 04 Aug 2013 03:17:36 +0000

Background We recently moved the Getup site from mixed HTTP/HTTPS to completely HTTPS. The primary driver was to ensure that sessions were never sent in plain text over the wire, to avoid session hijacking. There are other benefits too, such as protecting personal details from eavesdropping over the wire, proving site authenticity and generally simplifying […]

Talk on Tues: Moving to HTTPS

Sun, 28 Jul 2013 09:31:24 +0000

I’ll be giving a talk at Sydney ALT.NET on Tues: After recently moving the Getup site fully to HTTPS, James will share with you security pitfalls, the justification for the move from mixed HTTP/HTTPS, lessons learnt, and performance tips. A romp through the protocols of the web with riffs on status codes, HSTS, domain verification, […]

iAwards Win for CommunityRun / ControlShift!

Wed, 19 Jun 2013 06:42:30 +0000

Very pleased to announce that CommunityRun and the ControlShift platform have won the NSW iAwards in the Community Category. Many thanks to everyone from GetUp, ThoughtWorks and ControlShift labs for all the hard work and perseverance. I’m proud to have been part of the team to build a tool that lets anyone start and run […]

Talk tonight: Responsive Layout with HTML5

Mon, 26 Nov 2012 23:08:58 +0000

I’ll be giving a talk at Sydney ALT.NET tonight: Want to build a web application which dynamically changes layout to best suit the client, be it mobile, tablet or desktop with the same HTML? Fun times with HTML5, Bootstrap, HAML and Sass. You’ll get to see it in action, and the code behind the magic. […]