Domain Rewrite Rules

# First, we need to set the OPAC_LIBRARY_ID environment variable.  This should be in
# eg_vhost.conf already.
#----------------------------------------------------------------------------------
#  Add the library ID  (OILS_OPAC_LIBRARY_ID)
#----------------------------------------------------------------------------------
RewriteEngine   ON
RewriteCond %{QUERY_STRING} (^loc|&loc|;loc|^locg|&locg|;locg)=(\d+)
RewriteRule .   -   [E=OILS_OPAC_LIBRARY_ID:%2]

# Further down, we add the RewriteMap entries for the configuration files in the
# eg_vhost.conf:
RewriteMap lowercase int:tolower
RewriteMap libcode   txt:/openils/conf/libcode.txt
RewriteMap libtarget txt:/openils/conf/libtarget.txt
RewriteRule . - [E=libcode:${libcode:${lowercase:%{HTTP_HOST}}|CWMARS}]
RewriteRule . - [E=libtarget:${libtarget:%{ENV:libcode}}]
RewriteRule . - [E=OILS_OPAC_LIBRARY_ID:${libtarget:%{ENV:libcode}}]
RewriteRule . - [E=physical_loc:${libtarget:%{ENV:libcode}}]

# The above depends on having two files: /openils/conf/libcode.txt and
# /openils/conf/libtarget.txt.

# libcode.txt has line entries like the following
host.domain.tld code
# Where host.domain.tld is the fully qualified domain name of the site and code
# is a code to represent the library.  (We use the library's shortname from the
# actor.org_unit table as the code.)

# libtarget.txt has line entries like the following:
code id
# Where code is the code from libcode.txt and id is the location's id from the
# actor.org_unit table.

# If there's more to it, I'm not sure. :)