Actions that send files to browser smartly determine content-type HTTP header by the file name extnsion

app/controllers/application.rb

@@ -52,6 +52,21 @@ class ApplicationController < ActionController::Base
     check_authorization
   end
 
+  FILE_TYPES = {
+    '.exe' => 'application/octet-stream',
+    '.gif' => 'image/gif',
+    '.jpg' => 'image/jpeg',
+    '.pdf' => 'application/pdf',
+    '.png' => 'image/png',
+    '.txt' => 'text/plain',
+    '.zip' => 'application/zip'
+  }
+
+  def send_file(file, options = {})
+    options[:type] ||= (FILE_TYPES[File.extname(file)] || 'application/octet-stream')
+    super(file, options)
+  end
+
   def in_a_web?
     not @web_name.nil?
   end

app/controllers/file_controller.rb

@@ -4,18 +4,19 @@ require 'instiki_errors'
 
 class FileController < ApplicationController
 
-  layout 'default', :except => [:rss_feed, :rss_with_headlines, :tex,  :export_tex, :export_html]
+  layout 'default'
 
   def file
     if have_file?
       send_file(file_path)
     else
-      render_text 'form'
+      logger.debug("File not found: #{file_path}")
+      # to template, which is a file upload form
     end
   end
-  
+
   private
-  
+
   def have_file?
     sanitize_file_name
     File.file?(file_path)
@@ -24,7 +25,7 @@ class FileController < ApplicationController
   SANE_FILE_NAME = /[-_A-Za-z0-9]{1,255}/
 
   def sanitize_file_name
-    raise Instiki::ValidationError.new("Invalid path") unless @file_name
+    raise Instiki::ValidationError.new("Invalid path: no file name") unless @file_name
     unless @file_name =~ SANE_FILE_NAME
       raise ValidationError.new("Invalid file name: '#{@file_name}'.\n" +
             "Only latin characters, digits, underscores and dashes are accepted.")
@@ -32,7 +33,7 @@ class FileController < ApplicationController
   end
 
   def file_area
-    raise Instiki::ValidationError.new("Invalid path") unless @web_name
+    raise Instiki::ValidationError.new("Invalid path: no web name") unless @web_name
     file_area = File.expand_path("#{@wiki.storage_path}/#{@web_name}")
     FileUtils.mkdir_p(file_area) unless File.directory?(file_area)
     file_area

app/controllers/wiki_controller.rb

@@ -84,7 +84,7 @@ class WikiController < ApplicationController
 
     export_web_to_tex "#{file_path}.tex"  unless FileTest.exists? "#{file_path}.tex"
     convert_tex_to_pdf "#{file_path}.tex"
-    send_file("#{file_path}.pdf")
+    send_file "#{file_path}.pdf"
   end
 
   def export_tex
@@ -92,7 +92,7 @@ class WikiController < ApplicationController
     file_path = @wiki.storage_path + file_name
 
     export_web_to_tex(file_path) unless FileTest.exists?(file_path)
-    send_file(file_path)
+    send_file file_path
   end
 
   def feeds
@@ -184,10 +184,10 @@ class WikiController < ApplicationController
     file_name = "#{safe_page_name}-#{@web.address}-#{@page.created_at.strftime('%Y-%m-%d-%H-%M-%S')}"
     file_path = @wiki.storage_path + file_name
 
-    export_page_to_tex(file_path + '.tex') unless FileTest.exists?(file_path + '.tex')
+    export_page_to_tex("#{file_path}.tex") unless FileTest.exists?("#{file_path}.tex")
     # NB: this is _very_ slow
-    convert_tex_to_pdf(file_path + '.tex')
-    send_file(file_path + '.pdf')
+    convert_tex_to_pdf("#{file_path}.tex")
+    send_file "#{file_path}.pdf"
   end
 
   def print
@@ -300,7 +300,7 @@ class WikiController < ApplicationController
     end
     FileUtils.rm_rf(Dir[@wiki.storage_path + file_prefix + '*.zip'])
     FileUtils.mv(tmp_path, file_path)
-    send_file(file_path, :type => 'application/zip')
+    send_file file_path
   end
 
   def export_web_to_tex(file_path)