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Asked: 2015-05-19 05:30:06 +0800 CST

Using RewriteMap Lookups in a RewriteCond . Possible?

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I am trying the following 

RewriteMap lookup "txt:D:/lookup.txt"
RewriteCond %{REQUEST_URI} ^/${lookup}
RewriteRule ^/(.*)/(.*)$ /a/$1/b/$2.html [PT,L]

I am trying to compare if the request path is starting with the valid paths or not.

I have a long list of paths in the lookup file.

Please help on this.

apache-2.2

1 Answers

  1. I've discovered that you cannot have a variable in the RewriteCond regex, because it seems it is only compiled once, but not per-request.

    You could workaround this by putting both ${lookup} and %{REQUEST_URI} in a test string using a separator (let's say a comma) and then make sure they are equal, e.g :

    RewriteCond %{REQUEST_URI},/${lookup:/$1/}/$2 ^([^,]+),\1

    Also note that, for this given sample URL http://mydomain.dom/abc/mypage.html :

    %{REQUEST_URI} = /abc/mypage.html

    but

    ${lookup:$1} = abc

    So %{REQUEST_URI} will never be equal to ${lookup:$1}.

    To make them equal when requested, you have to :

    • enclose ${lookup:$1} with / to get /abc/ = /${lookup:$1}/
    • add $2 to also get the requested file : /abc/mypage.html = /${lookup:$1}/$2
    • As your key is /abc/ (and not abc) you need to enclode $1 with / to match the key : /${lookup:/$1/}/

    So finally you will have this :

    RewriteMap lookup "txt:/var/www/lookup.txt"
RewriteCond %{REQUEST_URI},/${lookup:/$1/}/$2 ^([^,]+),\1
RewriteRule ^/(.*)/(.*)$ /a/$1/b/$2 [R=301]

    Going to http://mydomain.dom/abc/mypage.html gives me the following log :

    (1) pass through /a/abc/b/mypage.html
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