Apache mod_rewrite script handler that maps Fedora URI requests to filesystem paths (as possible)

fedora-rewrite-map

#!/usr/bin/env ruby

require 'rubygems'
require 'rubydora'

require 'trollop'

opts = Trollop::options do
  version "fedora-rewrite-map 0.0.1 (c) 2011 Chris Beer"
  banner <<-EOS
    Usage:
      fedora-rewrite-map [options]
  EOS

  opt :user, "Fedora User", :default => 'fedoraAdmin'
  opt :password, "Fedora Password", :default => 'fedora'
  opt :url, "Fedora Url", :default => 'http://localhost:8983/fedora'
  opt :path, "Path to the Fedora Datastream file store", :default => './fedora/data/datastreams/'
end

@repository = Rubydora::Repository.new :url => opts[:url], :user => opts[:user], :password => opts[:password]
FEDORA_DATASTREAM_STORE_PATH = File.expand_path(opts[:path])

def convert_uri_to_filesystem_path uri
  pid, dsid = uri.split('/')
  return nil unless pid and dsid

  ds = @repository.find(pid).datastreams[dsid]
  return nil unless ds and not ds.new?
 
  location = ds.profile["dsLocation"]
  case ds.profile["dsLocationType"]
    when "INTERNAL_ID"
      path_on_filesystem(location)
    else
      location
  end
end

def path_on_filesystem location
  %x[find #{FEDORA_DATASTREAM_STORE_PATH} -name #{location.gsub(':', '_')}].split("\n").first.strip
end

while uri = gets
  puts "#{convert_uri_to_filesystem_path(uri.strip)}\n" rescue "\n"
end

fedora-rewrite-map-init

#!/bin/sh

./fedora-rewrite-map # --user [...] --password [...] etc

gistfile1.txt

RewriteEngine On
RewriteMap fedora-map prg:/path/to/fedora-rewrite-map-init
RewriteCond %{REQUEST_URI} Proxy # map just URIs with Proxy in them..
RewriteRule ^/fedora/get/([a-zA-Z0-9/:\-\.]+)$ ${fedora-map:$1}  [QSA] # map fedora requests to the fedora mapping script.