From cfaaacd9763642e91761de54c90669a88d772e5a Mon Sep 17 00:00:00 2001
From: schneems <richard.schneeman@gmail.com>
Date: Mon, 11 Aug 2014 13:29:25 -0500
Subject: Enable gzip compression by default

If someone is using ActionDispatch::Static to serve assets and makes it past the `match?` then the file exists on disk and it will be served. This PR adds in logic that checks to see if the file being served is already compressed (via gzip) and on disk, if it is it will be served as long as the client can handle gzip encoding. If not, then a non gzip file will be served.

This additional logic slows down an individual asset request but should speed up the consumer experience as compressed files are served and production applications should be delivered with a CDN. This PR allows a CDN to cache a gzip file by setting the `Vary` header appropriately. In net this should speed up a production application that are using Rails as an origin for a CDN. Non-asset request speed is not affected in this PR.
---
 actionpack/CHANGELOG.md                            |   6 +++
 .../lib/action_dispatch/middleware/static.rb       |  54 +++++++++++++++------
 actionpack/test/dispatch/static_test.rb            |  24 ++++++++-
 ...application-a71b3024f80aea3181c09774ca17e712.js |   4 ++
 ...lication-a71b3024f80aea3181c09774ca17e712.js.gz | Bin 0 -> 38457 bytes
 ...pplication-a71b3024f80aea3181c09774ca17e712.js" |   4 ++
 ...ication-a71b3024f80aea3181c09774ca17e712.js.gz" | Bin 0 -> 38457 bytes
 7 files changed, 76 insertions(+), 16 deletions(-)
 create mode 100644 actionpack/test/fixtures/public/gzip/application-a71b3024f80aea3181c09774ca17e712.js
 create mode 100644 actionpack/test/fixtures/public/gzip/application-a71b3024f80aea3181c09774ca17e712.js.gz
 create mode 100644 "actionpack/test/fixtures/\345\205\254\345\205\261/gzip/application-a71b3024f80aea3181c09774ca17e712.js"
 create mode 100644 "actionpack/test/fixtures/\345\205\254\345\205\261/gzip/application-a71b3024f80aea3181c09774ca17e712.js.gz"

(limited to 'actionpack')

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index e2731d0ee5..30986d0a6a 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,9 @@
+*   Requests that hit `ActionDispatch::Static` can now take advantage
+    of gzipped assets on disk. By default a gzip asset will be served if
+    the client supports gzip and a compressed file is on disk.
+
+    *Richard Schneeman*
+
 *   `ActionController::Parameters` will stop inheriting from `Hash` and
     `HashWithIndifferentAccess` in the next major release. If you use any method
     that is not available on `ActionController::Parameters` you should consider
diff --git a/actionpack/lib/action_dispatch/middleware/static.rb b/actionpack/lib/action_dispatch/middleware/static.rb
index 25e32cdef8..a3e8126ace 100644
--- a/actionpack/lib/action_dispatch/middleware/static.rb
+++ b/actionpack/lib/action_dispatch/middleware/static.rb
@@ -16,8 +16,9 @@ module ActionDispatch
     def initialize(root, cache_control)
       @root          = root.chomp('/')
       @compiled_root = /^#{Regexp.escape(root)}/
-      headers = cache_control && { 'Cache-Control' => cache_control }
-      @file_server   = ::Rack::File.new(@root, headers)
+      headers        = {}
+      headers['Cache-Control'] = cache_control if cache_control
+      @file_server = ::Rack::File.new(@root, headers)
     end
 
     def match?(path)
@@ -36,23 +37,48 @@ module ActionDispatch
     end
 
     def call(env)
-      @file_server.call(env)
+      path             = env['PATH_INFO']
+      gzip_file_exists = gzip_file_exists?(path)
+      if gzip_file_exists && gzip_encoding_accepted?(env)
+        env['PATH_INFO'] = "#{path}.gz"
+        status, headers, body       = @file_server.call(env)
+        headers['Content-Encoding'] = 'gzip'
+        headers['Content-Type']     = content_type(path)
+      else
+        status, headers, body = @file_server.call(env)
+      end
+
+      headers['Vary'] = 'Accept-Encoding' if gzip_file_exists
+      return [status, headers, body]
     end
 
-    def ext
-      @ext ||= begin
-        ext = ::ActionController::Base.default_static_extension
-        "{,#{ext},/index#{ext}}"
+    private
+      def ext
+        @ext ||= begin
+          ext = ::ActionController::Base.default_static_extension
+          "{,#{ext},/index#{ext}}"
+        end
       end
-    end
 
-    def unescape_path(path)
-      URI.parser.unescape(path)
-    end
+      def unescape_path(path)
+        URI.parser.unescape(path)
+      end
 
-    def escape_glob_chars(path)
-      path.gsub(/[*?{}\[\]]/, "\\\\\\&")
-    end
+      def escape_glob_chars(path)
+        path.gsub(/[*?{}\[\]]/, "\\\\\\&")
+      end
+
+      def content_type(path)
+        ::Rack::Mime.mime_type(::File.extname(path), 'text/plain')
+      end
+
+      def gzip_encoding_accepted?(env)
+        env['HTTP_ACCEPT_ENCODING'] =~ /\bgzip\b/
+      end
+
+      def gzip_file_exists?(path)
+        File.exist?(File.join(@root, "#{::Rack::Utils.unescape(path)}.gz"))
+      end
   end
 
   # This middleware will attempt to return the contents of a file's body from
diff --git a/actionpack/test/dispatch/static_test.rb b/actionpack/test/dispatch/static_test.rb
index afdda70748..f4b3a8cb93 100644
--- a/actionpack/test/dispatch/static_test.rb
+++ b/actionpack/test/dispatch/static_test.rb
@@ -1,6 +1,7 @@
 # encoding: utf-8
 require 'abstract_unit'
 require 'rbconfig'
+require 'zlib'
 
 module StaticTests
   def test_serves_dynamic_content
@@ -106,6 +107,18 @@ module StaticTests
     end
   end
 
+  def test_serves_gzip_files_when_header_set
+    file_name = "/gzip/application-a71b3024f80aea3181c09774ca17e712.js"
+    response  = get(file_name, 'HTTP_ACCEPT_ENCODING' => 'gzip')
+    assert_gzip  file_name, response
+    assert_equal 'application/javascript', response.headers['Content-Type']
+    assert_equal 'Accept-Encoding',        response.headers["Vary"]
+    assert_equal 'gzip',                   response.headers["Content-Encoding"]
+
+    response  = get(file_name, 'HTTP_ACCEPT_ENCODING' => '')
+    refute_equal 'gzip', response.headers["Content-Encoding"]
+  end
+
   # Windows doesn't allow \ / : * ? " < > | in filenames
   unless RbConfig::CONFIG['host_os'] =~ /mswin|mingw/
     def test_serves_static_file_with_colon
@@ -125,13 +138,20 @@ module StaticTests
 
   private
 
+    def assert_gzip(file_name, response)
+      expected = File.read("#{FIXTURE_LOAD_PATH}/#{public_path}" + file_name)
+      actual   = Zlib::GzipReader.new(StringIO.new(response.body)).read
+      assert_equal expected, actual
+    end
+
     def assert_html(body, response)
       assert_equal body, response.body
       assert_equal "text/html", response.headers["Content-Type"]
+      refute response.headers.key?("Vary")
     end
 
-    def get(path)
-      Rack::MockRequest.new(@app).request("GET", path)
+    def get(path, headers = {})
+      Rack::MockRequest.new(@app).request("GET", path, headers)
     end
 
     def with_static_file(file)
diff --git a/actionpack/test/fixtures/public/gzip/application-a71b3024f80aea3181c09774ca17e712.js b/actionpack/test/fixtures/public/gzip/application-a71b3024f80aea3181c09774ca17e712.js
new file mode 100644
index 0000000000..1826a7660e
--- /dev/null
+++ b/actionpack/test/fixtures/public/gzip/application-a71b3024f80aea3181c09774ca17e712.js
@@ -0,0 +1,4 @@
+!function(e,t){"object"==typeof module&&"object"==typeof module.exports?module.exports=e.document?t(e,!0):function(e){if(!e.document)throw new Error("jQuery requires a window with a document");return t(e)}:t(e)}("undefined"!=typeof window?window:this,function(e,t){function n(e){var t=e.length,n=it.type(e);return"function"===n||it.isWindow(e)?!1:1===e.nodeType&&t?!0:"array"===n||0===t||"number"==typeof t&&t>0&&t-1 in e}function r(e,t,n){if(it.isFunction(t))return it.grep(e,function(e,r){return!!t.call(e,r,e)!==n});if(t.nodeType)return it.grep(e,function(e){return e===t!==n});if("string"==typeof t){if(ft.test(t))return it.filter(t,e,n);t=it.filter(t,e)}return it.grep(e,function(e){return it.inArray(e,t)>=0!==n})}function i(e,t){do e=e[t];while(e&&1!==e.nodeType);return e}function o(e){var t=xt[e]={};return it.each(e.match(bt)||[],function(e,n){t[n]=!0}),t}function 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t=e.target;Lt.test(t.nodeName)&&!it._data(t,"changeBubbles")&&(it.event.add(t,"change._change",function(e){!this.parentNode||e.isSimulated||e.isTrigger||it.event.simulate("change",this.parentNode,e,!0)}),it._data(t,"changeBubbles",!0))})},handle:function(e){var t=e.target;return this!==t||e.isSimulated||e.isTrigger||"radio"!==t.type&&"checkbox"!==t.type?e.handleObj.handler.apply(this,arguments):void 0},teardown:function(){return it.event.remove(this,"._change"),!Lt.test(this.nodeName)}}),nt.focusinBubbles||it.each({focus:"focusin",blur:"focusout"},function(e,t){var n=function(e){it.event.simulate(t,e.target,it.event.fix(e),!0)};it.event.special[t]={setup:function(){var r=this.ownerDocument||this,i=it._data(r,t);i||r.addEventListener(e,n,!0),it._data(r,t,(i||0)+1)},teardown:function(){var r=this.ownerDocument||this,i=it._data(r,t)-1;i?it._data(r,t,i):(r.removeEventListener(e,n,!0),it._removeData(r,t))}}}),it.fn.extend({on:function(e,t,n,r,i){var o,a;if("object"==typeof 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it.clone(this,e,t)})},html:function(e){return At(this,function(e){var t=this[0]||{},n=0,r=this.length;if(void 0===e)return 1===t.nodeType?t.innerHTML.replace(Ot,""):void 0;if(!("string"!=typeof e||zt.test(e)||!nt.htmlSerialize&&Rt.test(e)||!nt.leadingWhitespace&&Bt.test(e)||Yt[(It.exec(e)||["",""])[1].toLowerCase()])){e=e.replace(Pt,"<$1></$2>");try{for(;r>n;n++)t=this[n]||{},1===t.nodeType&&(it.cleanData(g(t,!1)),t.innerHTML=e);t=0}catch(i){}}t&&this.empty().append(e)},null,e,arguments.length)},replaceWith:function(){var e=arguments[0];return this.domManip(arguments,function(t){e=this.parentNode,it.cleanData(g(this)),e&&e.replaceChild(t,this)}),e&&(e.length||e.nodeType)?this:this.remove()},detach:function(e){return this.remove(e,!0)},domManip:function(e,t){e=J.apply([],e);var n,r,i,o,a,s,l=0,u=this.length,c=this,d=u-1,f=e[0],p=it.isFunction(f);if(p||u>1&&"string"==typeof f&&!nt.checkClone&&Xt.test(f))return this.each(function(n){var r=c.eq(n);p&&(e[0]=f.call(this,n,r.html())),r.domManip(e,t)});if(u&&(s=it.buildFragment(e,this[0].ownerDocument,!1,this),n=s.firstChild,1===s.childNodes.length&&(s=n),n)){for(o=it.map(g(s,"script"),b),i=o.length;u>l;l++)r=s,l!==d&&(r=it.clone(r,!0,!0),i&&it.merge(o,g(r,"script"))),t.call(this[l],r,l);if(i)for(a=o[o.length-1].ownerDocument,it.map(o,x),l=0;i>l;l++)r=o[l],Ut.test(r.type||"")&&!it._data(r,"globalEval")&&it.contains(a,r)&&(r.src?it._evalUrl&&it._evalUrl(r.src):it.globalEval((r.text||r.textContent||r.innerHTML||"").replace(Gt,"")));s=n=null}return this}}),it.each({appendTo:"append",prependTo:"prepend",insertBefore:"before",insertAfter:"after",replaceAll:"replaceWith"},function(e,t){it.fn[e]=function(e){for(var n,r=0,i=[],o=it(e),a=o.length-1;a>=r;r++)n=r===a?this:this.clone(!0),it(o[r])[t](n),K.apply(i,n.get());return this.pushStack(i)}});var Qt,Zt={};!function(){var e;nt.shrinkWrapBlocks=function(){if(null!=e)return e;e=!1;var t,n,r;return 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t,n,r,i;n=ht.getElementsByTagName("body")[0],n&&n.style&&(t=ht.createElement("div"),r=ht.createElement("div"),r.style.cssText="position:absolute;border:0;width:0;height:0;top:0;left:-9999px",n.appendChild(r).appendChild(t),t.style.cssText="-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;display:block;margin-top:1%;top:1%;border:1px;padding:1px;width:4px;position:absolute",o=a=!1,l=!0,e.getComputedStyle&&(o="1%"!==(e.getComputedStyle(t,null)||{}).top,a="4px"===(e.getComputedStyle(t,null)||{width:"4px"}).width,i=t.appendChild(ht.createElement("div")),i.style.cssText=t.style.cssText="-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box;display:block;margin:0;border:0;padding:0",i.style.marginRight=i.style.width="0",t.style.width="1px",l=!parseFloat((e.getComputedStyle(i,null)||{}).marginRight)),t.innerHTML="<table><tr><td></td><td>t</td></tr></table>",i=t.getElementsByTagName("td"),i[0].style.cssText="margin:0;border:0;padding:0;display:none",s=0===i[0].offsetHeight,s&&(i[0].style.display="",i[1].style.display="none",s=0===i[0].offsetHeight),n.removeChild(r))}var n,r,i,o,a,s,l;n=ht.createElement("div"),n.innerHTML="  <link/><table></table><a href='/a'>a</a><input type='checkbox'/>",i=n.getElementsByTagName("a")[0],r=i&&i.style,r&&(r.cssText="float:left;opacity:.5",nt.opacity="0.5"===r.opacity,nt.cssFloat=!!r.cssFloat,n.style.backgroundClip="content-box",n.cloneNode(!0).style.backgroundClip="",nt.clearCloneStyle="content-box"===n.style.backgroundClip,nt.boxSizing=""===r.boxSizing||""===r.MozBoxSizing||""===r.WebkitBoxSizing,it.extend(nt,{reliableHiddenOffsets:function(){return null==s&&t(),s
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i,o,a,s=it.camelCase(t),l=e.style;if(t=it.cssProps[s]||(it.cssProps[s]=S(l,s)),a=it.cssHooks[t]||it.cssHooks[s],void 0===n)return a&&"get"in a&&void 0!==(i=a.get(e,!1,r))?i:l[t];if(o=typeof n,"string"===o&&(i=cn.exec(n))&&(n=(i[1]+1)*i[2]+parseFloat(it.css(e,t)),o="number"),null!=n&&n===n&&("number"!==o||it.cssNumber[s]||(n+="px"),nt.clearCloneStyle||""!==n||0!==t.indexOf("background")||(l[t]="inherit"),!(a&&"set"in a&&void 0===(n=a.set(e,n,r)))))try{l[t]=n}catch(u){}}},css:function(e,t,n,r){var i,o,a,s=it.camelCase(t);return t=it.cssProps[s]||(it.cssProps[s]=S(e.style,s)),a=it.cssHooks[t]||it.cssHooks[s],a&&"get"in a&&(o=a.get(e,!0,n)),void 0===o&&(o=tn(e,t,r)),"normal"===o&&t in fn&&(o=fn[t]),""===n||n?(i=parseFloat(o),n===!0||it.isNumeric(i)?i||0:o):o}}),it.each(["height","width"],function(e,t){it.cssHooks[t]={get:function(e,n,r){return n?ln.test(it.css(e,"display"))&&0===e.offsetWidth?it.swap(e,dn,function(){return L(e,t,r)}):L(e,t,r):void 0},set:function(e,n,r){var i=r&&en(e);return A(e,n,r?D(e,t,r,nt.boxSizing&&"border-box"===it.css(e,"boxSizing",!1,i),i):0)}}}),nt.opacity||(it.cssHooks.opacity={get:function(e,t){return sn.test((t&&e.currentStyle?e.currentStyle.filter:e.style.filter)||"")?.01*parseFloat(RegExp.$1)+"":t?"1":""},set:function(e,t){var n=e.style,r=e.currentStyle,i=it.isNumeric(t)?"alpha(opacity="+100*t+")":"",o=r&&r.filter||n.filter||"";n.zoom=1,(t>=1||""===t)&&""===it.trim(o.replace(an,""))&&n.removeAttribute&&(n.removeAttribute("filter"),""===t||r&&!r.filter)||(n.filter=an.test(o)?o.replace(an,i):o+" "+i)}}),it.cssHooks.marginRight=N(nt.reliableMarginRight,function(e,t){return t?it.swap(e,{display:"inline-block"},tn,[e,"marginRight"]):void 0}),it.each({margin:"",padding:"",border:"Width"},function(e,t){it.cssHooks[e+t]={expand:function(n){for(var r=0,i={},o="string"==typeof n?n.split(" "):[n];4>r;r++)i[e+St[r]+t]=o[r]||o[r-2]||o[0];return i}},nn.test(e)||(it.cssHooks[e+t].set=A)}),it.fn.extend({css:function(e,t){return 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