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Ehsan Khodarahmi
Asked: 2017-12-07 11:29:15 +0800 CST

How serve different content using apache and (maybe) mod_rewrite

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There are some files (with unique names) in a directory structure like this:

/var/www/domain1/unique_filename1
/var/www/domain2/unique_filename2
/var/www/domain3/unique_filename3

At the moment, all of the domain directories are accessible as sub-directories of a master domain and clients can access the files using following URIs:

www.my-master-domain.com/domain1/unique_filename1
www.my-master-domain.com/domain2/unique_filename2
www.my-master-domain.com/domain3/unique_filename3

I'd like to modify Apache 2.4 configuration so that I will be able to access files without mentioning secondary domains in my URLs, for example:

www.my-master-domain.com/unique_filename1
www.my-master-domain.com/unique_filename2
www.my-master-domain.com/unique_filename3

And of course it's not desirable to do any redirect on client browsers (and event If I wanted, it would not be possible in this special case), I just need to directly server the files via second set of mentioned URLs.

Any ideas?

apache-2.4

1 Answers

  1. Best Answer

    You could create a RewriteMap that maps "unique" filenames to the domain it is stored under. You can then use a RewriteRule directive to lookup the domain from the requested "unique" filename and internally rewrite the request.

    For example, in your server config, define the RewriteMap:

    RewriteMap fn2domain "txt:/var/www/filename-to-domain-map.txt"

    Then, in /var/www/filename-to-domain-map.txt you would include all your filename mappings:

    # Filename to Domain map
unique_filename1 domain1
unique_filename2 domain2
unique_filename3 domain3

    Now you can use mod_rewrite to reference this map in order to internally rewrite a request from /unique_filename2 to /domain2/unique_filename2 (for example).

    RewriteEngine On
RewriteRule ^/([^/]+)$ /${fn2domain:$1}/$1 [L]

    This assumes that "unique_filename" is exactly that; just a filename. No additional URL-path.

    You could make the lookup more efficient by using a dbm: DBM Hash File (or fastdbd: SQL Query?) instead of a plain text file, if you have many "filenames".

    Reference:
    https://httpd.apache.org/docs/2.4/rewrite/rewritemap.html

    Alternatively, you could perform filesystem checks for the existence of "unique_filename" in each domain subdirectory. The first match wins. This might be OK if you only have 2 or 3 domain subdirectories, but if you have many then this might become a performance problem as filesystem checks are relatively expensive. For example, again using mod_rewrite:

    RewriteEngine On

# Is it in domain1? Then rewrite to domain1 subdirectory
RewriteRule %{DOCUMENT_ROOT}/domain1/$1 -f
RewriteRule ^/([^/]+)$ /domain1/$1 [L]

# Is it in domain2? Then rewrite to domain2 subdirectory
RewriteRule %{DOCUMENT_ROOT}/domain2/$1 -f
RewriteRule ^/([^/]+)$ /domain2/$1 [L]

# Is it in domain3? Then rewrite to domain3 subdirectory
RewriteRule %{DOCUMENT_ROOT}/domain3/$1 -f
RewriteRule ^/([^/]+)$ /domain3/$1 [L]

# Repeat for each domain...
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