Plugin / C3 Cloudfront Cache Controller

Description

This is simple plugin that clear all cloudfront cache if you publish posts.
You can easy use CloudFront in front of WordPress.

Fixtures

• wp_is_mobile()
  Check device viewer type by CloudFront header.
  Now supports HTTP_CLOUDFRONT_IS_MOBILE_VIEWER and HTTP_CLOUDFRONT_IS_TABLET_VIEWER.

• preview url
  In preview page, plugin add post_date query to avoid CloudFront cache.
  And set wordpress_loginuser_last_visit cookie for avoid CloudFront cache too.

The wordpress_loginuser_last_visit cookie will be removed if user sign out.

Invalidation(Clear Cache) Page URL

This plugin send following page url to CloudFront Invalidation API.

• TOP page URL
• Published Post Page URL
• Category Archive Page URL

AWS IAM Policy Example

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "cloudfront:GetDistribution",
                "cloudfront:ListInvalidations",
                "cloudfront:GetStreamingDistribution",
                "cloudfront:GetDistributionConfig",
                "cloudfront:GetInvalidation",
                "cloudfront:CreateInvalidation"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}

Adding your configuration through env vars

The plugin can be configured by defining the following variables:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY
• C3_DISTRIBUTION_ID

You can put these variables like the code into the wp-config.php

php
define( 'AWS_ACCESS_KEY_ID', '' );
define( 'AWS_SECRET_ACCESS_KEY', '' );
define( 'C3_DISTRIBUTION_ID', '' );

Cookie

This plugin set a Cookie named wordpress_loginuser_last_visit to the user.
It prevents CDN caching when the user is previewing his posts or contents.
Once logging out from Dashboard, plugin removes this cookie from user.