From 7bbfc37df6217233725b024473e05a794f555a77 Mon Sep 17 00:00:00 2001
From: Terin Stock <terinjokes@gmail.com>
Date: Fri, 22 Apr 2016 11:26:28 -0700
Subject: [PATCH] automatically insert Link rel="preload" headers

---
 core/server/config/index.js     | 3 ++-
 core/server/middleware/index.js | 9 +++++++++
 package.json                    | 1 +
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/core/server/config/index.js b/core/server/config/index.js
index 2ca4561632..4fa4da9703 100644
--- a/core/server/config/index.js
+++ b/core/server/config/index.js
@@ -212,7 +212,8 @@ ConfigManager.prototype.set = function (config) {
         },
         deprecatedItems: ['updateCheck', 'mail.fromaddress'],
         // create a hash for cache busting assets
-        assetHash: assetHash
+        assetHash: assetHash,
+        preloadHeaders: this._config.preloadHeaders || false
     });
 
     // Also pass config object to
diff --git a/core/server/middleware/index.js b/core/server/middleware/index.js
index d8d3971b1e..0d5435f054 100644
--- a/core/server/middleware/index.js
+++ b/core/server/middleware/index.js
@@ -25,6 +25,7 @@ var bodyParser      = require('body-parser'),
     themeHandler     = require('./theme-handler'),
     uncapitalise     = require('./uncapitalise'),
     cors             = require('./cors'),
+    netjet           = require('netjet'),
 
     ClientPasswordStrategy  = require('passport-oauth2-client-password').Strategy,
     BearerStrategy          = require('passport-http-bearer').Strategy,
@@ -70,6 +71,14 @@ setupMiddleware = function setupMiddleware(blogApp, adminApp) {
         }
     }
 
+    // Preload link headers
+    if (config.preloadHeaders) {
+        blogApp.use(netjet({
+            cache: {
+                max: config.preloadHeaders
+            }
+        }));
+    }
     // Favicon
     blogApp.use(serveSharedFile('favicon.ico', 'image/x-icon', utils.ONE_DAY_S));
 
diff --git a/package.json b/package.json
index 393d5e96ef..40c46fa207 100644
--- a/package.json
+++ b/package.json
@@ -53,6 +53,7 @@
     "moment": "2.13.0",
     "morgan": "1.7.0",
     "multer": "1.1.0",
+    "netjet": "1.1.0",
     "node-uuid": "1.4.7",
     "nodemailer": "0.7.1",
     "oauth2orize": "1.2.2",