Apache expression to read from file and compare

jammann

11/24/23, 10:58 PM

I'm trying to write an Apache HTTP 2.4 snippet, where some directives are conditionally applied, if the content of a HTTP header matches a list of strings

This works as expected, the messages are logged if the header is 'x' or 'y'

<If "%{req:X-Header} in { 'x','y' }">
   LogMessage "Header: %{req:X-Header}"
   LogMessage "FileContent: %{file:/tmp/strings_to_compare}"
</If>

The file /tmp/strings_to_compare contains "{ 'x','y' }" and the LogMessage directive also shows this

What I actually want to do is something like this

<If "%{req:X-Header} in %{file:/tmp/strings_to_compare}">
   LogMessage "Header: %{req:X-Header}"
   LogMessage "FileContent: %{file:/tmp/strings_to_compare}"
</If>

But this approach doesn't work, the error message is

AH00526: Syntax error on line ...:
Cannot parse condition clause: syntax error, unexpected T_VAR_BEGIN, expecting T_ID or '{'

Ok, so the expression expects a verbatim list there, and not a function which returns a string. Is there any way to achieve what I'm trying to do?

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apache-2.4

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