Rewrite Rule with dynamic hostname - apache

Question

I'm interesting in rewrite rule to modify some url and paths. Here some Examples.
I have some hostnames which lookups to 1 VirtualHost throught ServerAlias in Apache conf.
example.com
anotherdomain.com
same.org
And a lot of anothers domains. Here, what I want to do:
example.com/uploads/photo.png -> /www/example.com/uploads/example.com/photo.png<br />
anotherdomain.com/uploads/photo.png -> /www/anotherdomain.com/uploads/anotherdomain.com/photo.png<br />
And same thing with another domains. This thing I've made already.
RewriteCond %{HTTP_HOST} ^(www\.)?(.*)$
RewriteRule ^uploads/([a-zA-Z0-9-\._]+)$ uploads/%2/$1 [L]
This work perfectly. But, if I try to access uploads/icons/category/image.png
I start to see 500 Internal Apache Error...
I've modify Rule to this:
RewriteCond %{REQUEST_URI} !^/uploads/%{HTTP_HOST}
RewriteCond %{HTTP_HOST} ^(www\.)?(.*)$
RewriteRule ^uploads/([a-zA-Z0-9-\._/]+)$ uploads/%2/$1 [L]
And Enable Apache Rewrite log with 9 verbosity.
RewriteCond: input='/uploads/icons/category/image.png' pattern='!^/uploads/%{HTTP_HOST}' => matched
rewrite 'uploads/icons/category/image.png' -> 'uploads/example.com/icons/category/image.png'
RewriteCond: input='/uploads/example.com/icons/category/image.png' pattern='!^/uploads/%{HTTP_HOST}' => matched
rewrite 'uploads/example.com/icons/category/image.png' -> 'uploads/example.com/example.com/icons/category/image.png'
And after that, it's exhausts 10 lookups =(
When I modify to this
RewriteCond %{REQUEST_URI} !^/uploads/example.com
RewriteCond %{HTTP_HOST} ^(www\.)?(.*)$
RewriteRule ^uploads/([a-zA-Z0-9-\._/]+)$ uploads/%2/$1 [L]
It's works perfectle for ALL stuff, but only for 1 domain: example.com
I found another solution, but it's not a perfect.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{HTTP_HOST} ^(www\.)?(.*)$
RewriteRule ^uploads/([a-zA-Z0-9-\._/]+)$ uploads/%2/$1 [L]
This Rule works only if I have existed dir and file. But, if i try to access:
/uploads/images/not-existed-404.nothing -> It return 500, because this file doesn't exists and rewriting into:
/uploads/example.com/example.com/example.com/example.com.......
P.S. Sorry for my bad English ;)

Answer 1

RewriteCond %{REQUEST_URI} !^/uploads/%{HTTP_HOST}
You CANNOT use variables or back references in pattern -- i.e. %{HTTP_HOST} will not be expanded to example.com, instead it will be treated as normal text.
You can uses these rules (working fine on my PC):
RewriteCond %{HTTP_HOST} ^(www\.)?(.*)$
RewriteCond %{DOCUMENT_ROOT}/uploads/%2/$1 -f
RewriteRule ^uploads/(.+)$ uploads/%2/$1 [L]
This rule will check if target file does exist and only then rewrites (order of conditions matter).
Let's assume:
domain name: example.com
website root: /www/example.com/
URL requested: /uploads/img/meow.png
Second condition (RewriteCond %{DOCUMENT_ROOT}/uploads/%2/$1 -f) will check if file /www/example.com/uploads/example.com/img/meow.png exists, and if it does -- then rewrite occurs.
Your .htaccess then may look like this:
RewriteEngine On
RewriteBase /
# do not do anything for already existing files & folders
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule .+ - [L]
# rewrite uploads to domain-specific folder
RewriteCond %{HTTP_HOST} ^(www\.)?(.*)$
RewriteCond %{DOCUMENT_ROOT}/uploads/%2/$1 -f
RewriteRule ^uploads/(.+)$ uploads/%2/$1 [L]