how to use AND OR for RewriteCond on Apache

Question

Is this how to use AND  OR for RewriteCond on Apache   rewritecond A  or  rewritecond B rewritecond C  or  rewritecond D RewriteRule     something   becomes if    A or B  and  C or D    rewrite it   So it seems like  OR  is higher precedence than  AND    Is there a way to easily tell  like in the   A or B  and  C or D  syntax

User · Answer

After many struggles and to achive a general, flexible and more readable solution, in my case I ended up saving the ORs results into ENV variables and doing the ANDs of those variables.

# RESULT_ONE = A OR B
RewriteRule ^ - [E=RESULT_ONE:False]
RewriteCond ...A... [OR]
RewriteCond ...B...
RewriteRule ^ - [E=RESULT_ONE:True]

# RESULT_TWO = C OR D
RewriteRule ^ - [E=RESULT_TWO:False]
RewriteCond ...C... [OR]
RewriteCond ...D...
RewriteRule ^ - [E=RESULT_TWO:True]

# if ( RESULT_ONE AND RESULT_TWO ) then ( RewriteRule ...something... )
RewriteCond %{ENV:RESULT_ONE} =True
RewriteCond %{ENV:RESULT_TWO} =True
RewriteRule ...something...

Requirements:

Apache mod_env enabled

User · Answer

Having trouble wrapping my head around this  Have a rewrite rule with four conditions  The first three conditions A  B  C are to be AND which is then OR with D RewriteCond A       true RewriteCond B       false RewriteCond C  OR   true RewriteCond D       true RewriteRule      But that seems to be an expression of A and B and  C or D    false  don t rewrite  How can I get to the desired expression   A and B and C  or D   true  rewrite  Preferably without using the additional steps of setting environment variables  HELP

User · Answer

This is an interesting question and since it isn t explained very explicitly in the documentation I ll answer this by going through the sourcecode of mod rewrite  demonstrating a big benefit of open-source   In the top section you ll quickly spot the defines used to name these flags    define CONDFLAG NONE               1 lt  lt 0  define CONDFLAG NOCASE             1 lt  lt 1  define CONDFLAG NOTMATCH           1 lt  lt 2  define CONDFLAG ORNEXT             1 lt  lt 3  define CONDFLAG NOVARY             1 lt  lt 4   and searching for CONDFLAG ORNEXT confirms that it is used based on the existence of the  OR  flag   else if     strcasecmp key   ornext      0             strcasecmp key   OR      0            cfg- gt flags    CONDFLAG ORNEXT      The next occurrence of the flag is the actual implementation where you ll find the loop that goes through all the RewriteConditions a RewriteRule has  and what it basically does is  stripped  comments added for clarity      loop through all Conditions that precede this Rule for  i   0  i  lt  rewriteconds- gt nelts    i        rewritecond entry  c    amp conds i          execute the current Condition  see if it matches     rc   apply rewrite cond c  ctx          does this Condition have an  OR  flag      if  c- gt flags  amp  CONDFLAG ORNEXT            if   rc                   One condition is false  but another can be still true                 continue                    else                  skip the rest of the chained OR conditions                while     i  lt  rewriteconds- gt nelts                     amp  amp  c- gt flags  amp  CONDFLAG ORNEXT                    c    amp conds   i                                     else if   rc            return 0            You should be able to interpret this  it means that OR has a higher precedence  and your example indeed leads to if    A OR B  AND  C OR D     If you would  for example  have these Conditions   RewriteCond A  or  RewriteCond B  or  RewriteCond C RewriteCond D   it would be interpreted as if    A OR B OR C  and D

[mod-rewrite] how to use "AND", "OR" for RewriteCond on Apache?

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