Added viewPort plugin

Author: pballester

README.md

@@ -12,6 +12,7 @@ Plugins enabled by default:
 - removeScriptTags (*prerender*)
 - httpHeaders (*prerender*)
 - redisCache (*custom - lib/redisCache*)
+- viewPort (*custom - lib/viewPort*)
 
 See [Prerender](https://github.com/prerender/prerender) for more documentation.
 
@@ -24,3 +25,10 @@ See [Prerender](https://github.com/prerender/prerender) for more documentation.
   - **PARAMS_TO_IGNORE** - Defaults to *[]*, query parameters separated by
     whitespace to be ignored, when ignoring a query parameter, we will cache and
     serve a specified URL without using the ignored query parameter.
+
+### ViewPort
+
+  Configuration by environment variables:
+
+  - **VIEWPORT_WIDTH** - Defaults to 1024.
+  - **VIEWPORT_HEIGHT** - Defaults to 1024.

lib/viewPort.js

@@ -0,0 +1,20 @@
+'use strict';
+
+var width = 1024; // 1440;
+var height = 1024; // 718;
+
+module.exports = {
+  onPhantomPageCreate: function (phantom, req, res, next) {
+    req.prerender.page.run(width, height, function (width, height, resolve) {
+      this.viewportSize = {
+        width: width,
+        height: height
+      };
+      resolve();
+    }).then(function () {
+      next();
+    }).catch(function (err) {
+      console.log('custom viewport size error', err);
+    });
+  }
+};

server.js

@@ -3,12 +3,13 @@
 
 var prerender = require('prerender');
 var redisCache = require('./lib/redisCache');
+var viewPort = require('./lib/viewPort');
 
 var server = prerender({
-    workers: process.env.PRERENDER_NUM_WORKERS,
-    iterations: process.env.PRERENDER_NUM_ITERATIONS,
-    resourceDownloadTimeout: process.env.RESOURCE_DOWNLOAD_TIMEOUT || 40000,
-    jsTimeout: process.env.JS_TIMEOUT || 40000
+  workers: process.env.PRERENDER_NUM_WORKERS,
+  iterations: process.env.PRERENDER_NUM_ITERATIONS,
+  resourceDownloadTimeout: process.env.RESOURCE_DOWNLOAD_TIMEOUT || 40000,
+  jsTimeout: process.env.JS_TIMEOUT || 40000
 });
 
 server.use(prerender.sendPrerenderHeader());
@@ -21,5 +22,5 @@ server.use(prerender.httpHeaders());
 // server.use(prerender.inMemoryHtmlCache());
 // server.use(prerender.s3HtmlCache());
 server.use(redisCache);
-
+server.use(viewPort);
 server.start();