Attachment Improvements By Xon

Attachment Improvements By Xon 2.3.2

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XF1 Version

Q. Attachment eTags are showing up prefixed with "W/"
A. This is expected depending on the CDN/webserver configuration. This add-on implements a workaround to support this.

Cloudflare has been seen to prepend W/ to some eTags to transform them from a strong eTag to a weak eTag.

Q.Attachment Etags are no longer a quoted number like standard XenForo eTags
A. Make sure the internal_data path has (depending on exact nginx configuration):
Code:
  add_header Etag $upstream_http_etag;

Q. After following Using DigitalOcean Spaces or Amazon S3 for file storage in XF 2.x attachments no longer show.

A. Additional configuration is required to enable X-Accel-Redirect when using DigitalOcean Spaces or Amazon S3

A internalDataUrl stanza l must be added to config.php like the externalDataUrl described in the tutorial

PHP:
$config['internalDataUrl'] = function($externalPath, $canonical)
{
    return 'internal_data_s3/https://xftest.ams3.digitaloceanspaces.com/internal_data/' . $externalPath;
};
nginx config must be updated with a new internal_data_s3 block;
PHP:
location ~* /internal_data_s3/(.*?)://(.*?)/(.*) {
    internal;
    set $xfEtag $upstream_http_etag;
    set $download_protocol $1;
    set $download_host $2;
    set $download_path $3;
    set $download_url $download_protocol://$download_host/$download_path;

    resolver 127.0.0.1 ipv6=off;
    proxy_set_header Host $download_host;
    proxy_set_header Authorization '';
    proxy_set_header Cookie '';
    proxy_max_temp_file_size 0;
    proxy_intercept_errors on;
    error_page 301 302 307 = @handle_redirect;

    proxy_ssl_server_name on;
    proxy_pass $download_url$is_args$args;

    proxy_hide_header Content-Disposition;
    proxy_hide_header Content-Type;
    proxy_hide_header Etag;
    proxy_hide_header x-amz-request-id;

    add_header Etag $xfEtag;
    add_header X-Frame-Options SAMEORIGIN;
    add_header X-Content-Type-Options nosniff;
}

location @handle_redirect {
   resolver 127.0.0.1 ipv6=off;
   set $saved_redirect_location '$upstream_http_location';
   proxy_pass $saved_redirect_location;
}

To implement proxy caching see https://www.nginx.com/resources/wiki/start/topics/examples/reverseproxycachingexample/
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