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authorJoshua Peek <josh@joshpeek.com>2009-02-07 00:08:28 -0600
committerJoshua Peek <josh@joshpeek.com>2009-02-07 00:08:28 -0600
commit2277fbedbea930fb8ce38ab7eb133de6fcc4a2d6 (patch)
tree784f2dfcd066eaa17a89cc435ec4de44393799c8 /actionpack/lib/action_controller/vendor/rack-1.0/rack/conditionalget.rb
parent24f2e676f700b8a387c6f4c27acf172658cd7863 (diff)
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Temporarily bundle Rack 1.0 prerelease for testing
Diffstat (limited to 'actionpack/lib/action_controller/vendor/rack-1.0/rack/conditionalget.rb')
-rw-r--r--actionpack/lib/action_controller/vendor/rack-1.0/rack/conditionalget.rb45
1 files changed, 45 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/vendor/rack-1.0/rack/conditionalget.rb b/actionpack/lib/action_controller/vendor/rack-1.0/rack/conditionalget.rb
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+++ b/actionpack/lib/action_controller/vendor/rack-1.0/rack/conditionalget.rb
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+require 'rack/utils'
+
+module Rack
+
+ # Middleware that enables conditional GET using If-None-Match and
+ # If-Modified-Since. The application should set either or both of the
+ # Last-Modified or Etag response headers according to RFC 2616. When
+ # either of the conditions is met, the response body is set to be zero
+ # length and the response status is set to 304 Not Modified.
+ #
+ # Applications that defer response body generation until the body's each
+ # message is received will avoid response body generation completely when
+ # a conditional GET matches.
+ #
+ # Adapted from Michael Klishin's Merb implementation:
+ # http://github.com/wycats/merb-core/tree/master/lib/merb-core/rack/middleware/conditional_get.rb
+ class ConditionalGet
+ def initialize(app)
+ @app = app
+ end
+
+ def call(env)
+ return @app.call(env) unless %w[GET HEAD].include?(env['REQUEST_METHOD'])
+
+ status, headers, body = @app.call(env)
+ headers = Utils::HeaderHash.new(headers)
+ if etag_matches?(env, headers) || modified_since?(env, headers)
+ status = 304
+ body = []
+ end
+ [status, headers, body]
+ end
+
+ private
+ def etag_matches?(env, headers)
+ etag = headers['Etag'] and etag == env['HTTP_IF_NONE_MATCH']
+ end
+
+ def modified_since?(env, headers)
+ last_modified = headers['Last-Modified'] and
+ last_modified == env['HTTP_IF_MODIFIED_SINCE']
+ end
+ end
+
+end