Mirror remote image files, supports dynamic resizing of images. nginx image_filter remote fetching with a local mirror of original and resized image. Using try_files instead of if statements and proxy_pass with proxy_store for permanent local storage. No cache expiration, that will need to be handled outside of this.

readme.markdown

Nginx image filter + caching of results.

Supports dynamic thumbnails images sizes processing + caching results, simple to use.

Awesome!!!

img.l

server {
  server_name  img.l;
  root            /var/www/cache/store/ns365;
  index           index.html;

  # This requests the original file from itself and then resizes the image.
  location ~ /resize/(\d+)x(\d+)/(.*) {
    proxy_pass                  http://img.l/$3;
    image_filter                resize $1 $2;
    image_filter_jpeg_quality   90;
    image_filter_buffer         10M;
    # Do not call this directly because the resized image is NOT cached.
    allow 127.0.0.0/8;
    deny all;
  }

  # Access denied.
  location /resize {
    return 403;
  }

  # RESIZED:  http://img.l/200x200/files/2013/03/March_11_2013_ML.jpg
  location ~ /(\d+x\d+/.*) {
    try_files                     /$1 @img;
  }

  # ORIGINAL: http://img.l/files/2013/03/March_11_2013_ML.jpg
  location / {
    # If we don't find the file locally download it.
    error_page                    404 = @proxy;
  }

  # This saves the resized image locally.
  location @img {
    proxy_pass                    http://img.l/resize$uri;
    proxy_store                   /var/www/cache/store/ns365$uri;
  }

  # This gets the remote image and saves it locally.
  location @proxy {
    proxy_pass                    http://example.com$uri;
    proxy_set_header              X-Real-IP  $remote_addr;
    proxy_set_header              X-Forwarded-For  $proxy_add_x_forwarded_for;
    proxy_store                   /var/www/cache/store/ns365$uri;
  }

}