README

Provides dynamic image sizing and optimization via statically.io and only creates WordPress thumbnails for images that require hard cropping.

Installation Composer v1

Add the following to the composer.json repositories object:

  "repositories": [
      {
        "type": "vcs",
        "url": "git@github.com:moderntribe/tribe-storage-statically-cdn.git"
      }
  ]

Then run:

composer require moderntribe/tribe-storage-statically-cdn

Configuration

There are two ways to configure this plugin, either directly using the cdn.statically.io directly, or proxying to that domain via Nginx.

Use statically.io URLs directly

Ensure you have defined the TRIBE_STORAGE_URL constant in wp-config.php to your cloud provider's publicly accessible URL and it will be replaced to use Statically's CDN for images only:

NOTE: Image URLs are cached, ensure your flush your object cache if you make any changes to the following defines.

// Azure example
define( 'TRIBE_STORAGE_URL', 'https://account.blob.core.windows.net/container' );

URL rewriting would look as follows:

• Original: https://account.blob.core.windows.net/container/sites/4/2021/06/image.jpg
• Rewritten: https://cdn.statically.io/img/account.blob.core.windows.net/f=auto,w=1024,h=1024/container/sites/4/2021/06/image.jpg

Use statically.io as a proxy via Nginx

Ensure you do not have TRIBE_STORAGE_URL defined, and define the following in wp-config.php:

define( 'TRIBE_STORAGE_STATICALLY_PROXY', true );

Sample Nginx Proxy

Replace account.blob.core.windows.net below with your cloud provider's hostname. Using the example from above it would be: account.blob.core.windows.net/container

# Root site and sub sites
location ~* ^/(.+)?wp-content/uploads {
    try_files $uri $uri/ @statically;
}

# Check statically first
location @statically {
    # adjust the /container below to your actual container name
    rewrite "^/(.+)?wp-content/uploads/(.*=.*?[\/])?(.+)$" /$2container/$3 break;

    proxy_http_version 1.1;
    resolver 1.1.1.1;

    proxy_set_header Connection '';
    proxy_set_header Authorization '';
    proxy_set_header Host cdn.statically.io;

    proxy_hide_header Set-Cookie;
    proxy_ignore_headers Set-Cookie;

    proxy_intercept_errors on;
    recursive_error_pages on;
    error_page 400 404 500 = @uploads;

    add_header X-Image-Path "$uri" always;
    
    proxy_pass https://cdn.statically.io/img/account.blob.core.windows.net$uri;
}

# Fallback to check Azure directly
location @uploads {
    # remove any statically.io params, e.g f=auto,w=518,h=291/
    rewrite ^/(.*=.*?[\/])?(.+)$ /$2 break;
    proxy_http_version 1.1;
    resolver 1.1.1.1;

    proxy_set_header Connection '';
    proxy_set_header Authorization '';
    proxy_set_header Host account.blob.core.windows.net;

    proxy_hide_header x-ms-blob-type;
    proxy_hide_header x-ms-lease-status;
    proxy_hide_header x-ms-request-id;
    proxy_hide_header x-ms-version;
    proxy_hide_header Set-Cookie;
    proxy_ignore_headers Set-Cookie;
    
    proxy_intercept_errors on;
    recursive_error_pages on;
    error_page 400 404 500 = @imageerror;

    add_header X-Image-Path "$uri" always;
    add_header Cache-Control max-age=31536000;

    proxy_pass https://account.blob.core.windows.net$uri;
}

# If both the above fail, show the default Nginx 404 error page
location @imageerror {
    add_header X-Error-Uri "$uri" always;
    return 404;
}

URL rewriting would look as follows, and proxied to Statically behind the scenes:

• Original: https://example.com/wp-content/uploads/sites/4/2021/06/image.jpg
• Rewritten: https://example.com/wp-content/uploads/f=auto,w=1024,h=1024/sites/4/2021/06/image.jpg
• Proxied URL: https://cdn.statically.io/img/account.blob.core.windows.net/f=auto,w=1024,h=1024/container/sites/4/2021/06/image.jpg

Disable WordPress thumbnail creation

If you're not concerned with exact cropping, you can let statically.io resize your image based with keeping the same dimension ratio and disable thumbnail creation to see a large performance boost when uploading new images.

For this you have two options:

Option 1: Add this define to wp-config.php

define( 'TRIBE_STORAGE_STATICALLY_CREATE_THUMBNAILS', false );

Option 2: Make the tribe/storage/plugin/statically/create_thumbnails filter return false, e.g.

add_filter( 'tribe/storage/plugin/statically/create_thumbnails', '__return_false' );

NOTE: Don't forget to clear object caching and regenerate thumbnails each time this option is swapped.

Automated Testing

Testing provided via PHPUnit and the Brain Monkey testing suite.

Run Unit Tests

$ composer install
$ ./vendor/bin/phpunit

More Resources:

• Tribe Storage Documentation
• Modern Tribe