Add support for Google Analytics

If the `initializr.env.google-analytics-tracking-code` is specified with
the tracking code to use, the web UI automatically integrates with Google
Analytics.

Closes gh-180

initializr/src/main/groovy/io/spring/initializr/metadata/InitializrConfiguration.groovy

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -122,6 +122,11 @@ class InitializrConfiguration {
 		 */
 		String springBootMetadataUrl = 'https://spring.io/project_metadata/spring-boot'
 
+		/**
+		 * Tracking code for Google Analytics. Only enabled if a value is explicitly provided.
+		 */
+		String googleAnalyticsTrackingCode
+
 		/**
 		 * The application name to use if none could be generated.
 		 */
@@ -184,6 +189,7 @@ class InitializrConfiguration {
 		void merge(Env other) {
 			artifactRepository = other.artifactRepository
 			springBootMetadataUrl = other.springBootMetadataUrl
+			googleAnalyticsTrackingCode = other.googleAnalyticsTrackingCode
 			fallbackApplicationName = other.fallbackApplicationName
 			invalidApplicationNames = other.invalidApplicationNames
 			forceSsl = other.forceSsl

initializr/src/main/groovy/io/spring/initializr/web/AbstractInitializrController.groovy

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -47,9 +47,11 @@ abstract class AbstractInitializrController {
 	 * Render the home page with the specified template.
 	 */
 	protected String renderHome(String templatePath) {
+		def metadata = metadataProvider.get()
+
 		def model = [:]
 		model['serviceUrl'] = generateAppUrl()
-		metadataProvider.get().properties.each {
+		metadata.properties.each {
 			if (it.key.equals('types')) {
 				model['types'] = it.value.clone()
 			} else {
@@ -60,6 +62,9 @@ abstract class AbstractInitializrController {
 		// Only keep project type
 		model['types'].content.removeAll { t -> !'project'.equals(t.tags['format']) }
 
+		// Google analytics support
+		model['trackingCode'] = metadata.configuration.env.googleAnalyticsTrackingCode
+
 		template templatePath, model
 	}
 

initializr/src/main/resources/META-INF/spring-configuration-metadata.json

@@ -126,6 +126,12 @@
       "sourceType": "io.spring.initializr.metadata.InitializrConfiguration$Env",
       "defaultValue": true
     },
+    {
+      "name": "initializr.env.google-analytics-tracking-code",
+      "type": "java.lang.String",
+      "description": "Tracking code for Google Analytics.",
+      "sourceType": "io.spring.initializr.metadata.InitializrConfiguration$Env"
+    },
     {
       "name": "initializr.env.invalid-application-names",
       "type": "java.util.List<java.lang.String>",

initializr/src/main/resources/templates/home.html

@@ -172,5 +172,14 @@
 <script src="/js/typeahead.bundle.min.js"></script>
 <script src="/js/mousetrap.min.js"></script>
 <script src="/js/start.js"></script>
+<% if (trackingCode) { %>
+<script>
+    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+                (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+            m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+    })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+    ga('create', '${trackingCode}', 'auto');
+    ga('send', 'pageview');
+</script><% } %>
 </body>
 </html>

initializr/src/test/groovy/io/spring/initializr/web/MainControllerEnvIntegrationTests.groovy

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -59,4 +59,10 @@ class MainControllerEnvIntegrationTests extends AbstractInitializrControllerInte
 				.hasSpringBootStarterTest()
 	}
 
+	@Test
+	void googleAnalytics() {
+		def body = htmlHome()
+		assertTrue 'google analytics should be enabled', body.contains("ga('create', 'UA-1234567-89', 'auto');")
+	}
+
 }

initializr/src/test/groovy/io/spring/initializr/web/MainControllerIntegrationTests.groovy

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -440,6 +440,12 @@ class MainControllerIntegrationTests extends AbstractInitializrControllerIntegra
 		assertNotNull(response.body)
 	}
 
+	@Test
+	void googleAnalyticsDisabledByDefault() {
+		def body = htmlHome()
+		assertFalse 'google analytics should be disabled', body.contains('GoogleAnalyticsObject')
+	}
+
 	private JSONObject getMetadataJson() {
 		getMetadataJson(null, null)
 	}

initializr/src/test/resources/application-test-custom-env.yml

@@ -1,6 +1,7 @@
 initializr:
   env:
     artifactRepository: https://repo.spring.io/lib-release
+    google-analytics-tracking-code: UA-1234567-89
     forceSsl: false
     fallbackApplicationName: FooBarApplication
     invalidApplicationNames:

initializr/src/test/resources/metadata/config/test-default.json

@@ -33,6 +33,7 @@
     "artifactRepository": "https://repo.spring.io/release/",
     "fallbackApplicationName": "Application",
     "forceSsl": true,
+    "googleAnalyticsTrackingCode": null,
     "invalidApplicationNames": [
       "SpringApplication",
       "SpringBootApplication"