Nginx rewrite question

Question

Trying to convert over an apache config to nginx.

<Directory /usr/local/image/>
 Order allow,deny
 Allow from all
</Directory>
Alias /key1 /usr/local/image
Alias /key2 /usr/local/image
RewriteEngine On
RewriteCond /usr/local/image/$1 !-f
RewriteRule ^\.(jpg|jpeg|gif|png))$ /handler.php

so a request to /key1/subdir1/subdir2/123.png OR /key2/subdir1/subdir2/123.png would look to /usr/local/image/subdir1/subdir2/123.png, serve it if it exists, or go to /handler.php if not (404)

I've tried:

    location ^~ /key1 {
     alias /usr/local/image/;
     error_page 404 /handler.php;
}

Which somewhat works - but I would like to limit this rule to only images (jp?g|gif|png) but the subdir1 & subdir2 values will vary.

Any suggestions on how to efficiently do this in nginx?

Answer 1

Try this:

location ~* /key[12]/(.*\.(jpe?g|gif|png)) {
    alias /usr/local/image/$1;
    error_page 404 /handler.php;
}

PS: I use ~* for case insensitive matching.

---

EDIT

If your two aliases are completely different, you can put it into round brackets:

location ~* /(?:abc12345|12abcdef)/(.*\.(jpe?g|gif|png)) {
    alias /usr/local/image/$1;
    error_page 404 /handler.php;
}

• a question mask colon ?: at the beginning of the group means not counting for back reference.