Title: Cairn
Author: BF
Published: <strong>January 2, 2014</strong>
Last modified: April 16, 2014

---

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![](https://ps.w.org/cairn/assets/banner-772x250.png?rev=831960)

This plugin **hasn’t been tested with the latest 3 major releases of WordPress**.
It may no longer be maintained or supported and may have compatibility issues when
used with more recent versions of WordPress.

![](https://s.w.org/plugins/geopattern-icon/cairn_f6eaeb.svg)

# Cairn

 By [BF](https://profiles.wordpress.org/braydonf/)

[Download](https://downloads.wordpress.org/plugin/cairn.zip)

 * [Details](https://wordpress.org/plugins/cairn/#description)
 * [Reviews](https://wordpress.org/plugins/cairn/#reviews)
 *  [Installation](https://wordpress.org/plugins/cairn/#installation)
 * [Development](https://wordpress.org/plugins/cairn/#developers)

 [Support](https://wordpress.org/support/plugin/cairn/)

## Description

Sell fine art online. Cairn is built to be fast and secure to display artwork full
screen and across a wide range of display sizes.

Cairn is fast because template rendering is handled on the client side. Cairn replaces
the theme and permalink features of WordPress by hooking into the rewrite rules 
with url rules defined in static/urls.json. Templates are written using EJS Templating
and are rendered on the client side. There is a jQuery plugin written that uses 
the same rules to speed up user interactions, and with enough data able to render
URLS without a request to the remote server.

Cairn is secure because personally identifiable information is stored in the database
encrypted with a GPG public key, and private keys stored optimistically offline.
This information should be submitted over an TLS connection (HTTPS), and is compulsory
when using this plugin. Additionally security features include payments being able
to be handled using cryptocurrency Bitcoin, and thus no potentially personally identifiable
information is nessasary to be shared with a third party and can be directly peer-
to-peer.

Features

 * Accept bitcoin and credit card payments
 * Personal privacy and security
 * Dynamic prices and currency preference
 * Designed for mobile
 * URL navigation is client side and lightweight

Prerequisites:

 * A computer running GNU/Linux, Apache, MySQL to do development and testing.
 * The use of GPG and have a public/private for email
 * Expert knowledge of JavaScript, jQuery and AJAX
 * General knowledge of EJS JavaScript templating
 * Experience with the Electrum Bitcoin Wallet and general concepts of peer-to-peer
   payments.
 * Understand priciples of asymetric cryptography and public/private keys
 * Intermediate knowledge of PHP
 * USPS Web Tools API account for shipping calculations
 * A Stripe account to process credit cards
 * General knowledge of RSS/Atom feeds
 * Apache .htaccess and general priciples of rewriting URLs
 * Experience with configuring cron schedules
 * Knowledge of PHP APC for caching is a plus

## Installation

URI are defined in /static/urls.json which is parsed and used within WordPress and
jQuery Cairn

It is recommended to disable the default cron in the wp-config.php

define(‘DISABLE_WP_CRON’,true);

And then enable the cron to be scheduled externally so that tasks do not
 interfere
with page loading:

php5 -q //wp-cron.php

Rewrite rules needed to be added for images to be scaled dynamically:

RewriteCond %{REQUEST_FILENAME} -f RewriteCond %{REQUEST_URI} .(gif|png|jpg|jpeg)
RewriteCond %{QUERY_STRING} (w|h)=(._)$ RewriteRule (._) /wp-content/plugins/cairn/
includes/timthumb/timthumb.php?src=$1&%1=%2&%3=%4 [L]

It is also recommended to use object caching such as APC.

To generate documentation:

JavaScript Documented with http://usejsdoc.org/ jsdoc static/callbacks.js static/
jquery.cairn.js static/readme.md -d docs/js/

PHP Documented with http://phpdoc.org/ phpdoc -d . -t ./docs/php/

Full Documentation is available at: http://bitgress.com/cairn/

To clone a git repository: git clone https://git.gitorious.org/cairn/cairn.git

## Reviews

There are no reviews for this plugin.

## Contributors & Developers

“Cairn” is open source software. The following people have contributed to this plugin.

Contributors

 *   [ BF ](https://profiles.wordpress.org/braydonf/)

[Translate “Cairn” into your language.](https://translate.wordpress.org/projects/wp-plugins/cairn)

### Interested in development?

[Browse the code](https://plugins.trac.wordpress.org/browser/cairn/), check out 
the [SVN repository](https://plugins.svn.wordpress.org/cairn/), or subscribe to 
the [development log](https://plugins.trac.wordpress.org/log/cairn/) by [RSS](https://plugins.trac.wordpress.org/log/cairn/?limit=100&mode=stop_on_copy&format=rss).

## Meta

 *  Version **0.1.5**
 *  Last updated **12 years ago**
 *  Active installations **Fewer than 10**
 *  WordPress version ** 3.8 or higher **
 *  Tested up to **3.9.40**
 * Tags
 * [art](https://wordpress.org/plugins/tags/art/)[bitcoin](https://wordpress.org/plugins/tags/bitcoin/)
   [cart](https://wordpress.org/plugins/tags/cart/)[checkout](https://wordpress.org/plugins/tags/checkout/)
   [commerce](https://wordpress.org/plugins/tags/commerce/)[creative commons](https://wordpress.org/plugins/tags/creative-commons/)
   [ecommerce](https://wordpress.org/plugins/tags/ecommerce/)[electrum](https://wordpress.org/plugins/tags/electrum/)
   [exhibition](https://wordpress.org/plugins/tags/exhibition/)[gallery](https://wordpress.org/plugins/tags/gallery/)
   [gpg](https://wordpress.org/plugins/tags/gpg/)[javascript](https://wordpress.org/plugins/tags/javascript/)
   [license](https://wordpress.org/plugins/tags/license/)[pgp](https://wordpress.org/plugins/tags/pgp/)
   [privacy](https://wordpress.org/plugins/tags/privacy/)[sales](https://wordpress.org/plugins/tags/sales/)
   [sell](https://wordpress.org/plugins/tags/sell/)[shipping](https://wordpress.org/plugins/tags/shipping/)
   [shop](https://wordpress.org/plugins/tags/shop/)[shopping](https://wordpress.org/plugins/tags/shopping/)
   [store](https://wordpress.org/plugins/tags/store/)[templates](https://wordpress.org/plugins/tags/templates/)
   [usps](https://wordpress.org/plugins/tags/usps/)
 *  [Advanced View](https://wordpress.org/plugins/cairn/advanced/)

## Ratings

No reviews have been submitted yet.

[Your review](https://wordpress.org/support/plugin/cairn/reviews/#new-post)

[See all reviews](https://wordpress.org/support/plugin/cairn/reviews/)

## Contributors

 *   [ BF ](https://profiles.wordpress.org/braydonf/)

## Support

Got something to say? Need help?

 [View support forum](https://wordpress.org/support/plugin/cairn/)