URI rewriting to determine a controller based on an action name

app/controllers/file_controller.rb

@@ -1,4 +1,5 @@
 require 'application'
+
 class FileController < ApplicationController
 
   layout 'default', :except => [:rss_feed, :rss_with_headlines, :tex,  :export_tex, :export_html]

libraries/url_rewriting_hack.rb

@@ -6,7 +6,7 @@
 # In Instiki URLs are mapped to the ActionPack actions, possibly performed on a particular 
 # web (sub-wiki) and page within that web.
 #
-# 1. Controller is always 'wiki'
+# 1. Controller is determined by action name (default is 'wiki')
 # 2. '/name1/' maps to action 'name1', unspecified web
 #    Example: http://localhost/new_system/
 # 3. Special case of above, URI '/wiki/' maps to action 'index', because Rails sets this address 
@@ -24,6 +24,16 @@ require 'dispatcher'
 class DispatchServlet
 
   def self.parse_uri(path)
+    result = parse_path(path)
+    if result
+      result[:controller] = ActionMapper.map_to_controller(result[:action])
+      result
+    else
+      false
+    end
+  end
+
+  def self.parse_path(path)
     ApplicationController.logger.debug "Parsing URI '#{path}'"
     component = '([-_a-zA-Z0-9]+)'
     page_name = '(.*)'
@@ -48,6 +58,19 @@ class DispatchServlet
       line
     end
   end
+  
+  class ActionMapper
+
+    @@action_to_controller_map = {
+      'file' => 'file',
+      'pic' => 'file'
+    }
+    
+    def self.map_to_controller(action)
+      @@action_to_controller_map[action] || 'wiki'
+    end
+  
+  end
 
 end
 

test/unit/url_rewriting_hack_test.rb

@@ -72,5 +72,21 @@ class UrlRewritingHackTest < Test::Unit::TestCase
     assert_equal 'http://test.host/',
         ur.rewrite(:controller => 'wiki')
   end
+  
+  def test_controller_mapping
+    request = ActionController::TestRequest.new
+    ur = ActionController::UrlRewriter.new(request, 'wiki', 'show')
+
+    assert_equal 'http://test.host/file',
+        ur.rewrite(:controller => 'file', :action => 'file')
+    assert_equal 'http://test.host/pic/abc.jpg',
+        ur.rewrite(:controller => 'file', :action => 'pic', :id => 'abc.jpg')
+    assert_equal 'http://test.host/web/pic/abc.jpg',
+        ur.rewrite(:web => 'web', :controller => 'file', :action => 'pic', :id => 'abc.jpg')
+        
+    # default option is wiki
+    assert_equal 'http://test.host/unknown_action',
+        ur.rewrite(:controller => 'wiki', :action => 'unknown_action')
+  end
 
 end