Added ServiceWorkerIgnoreHosts - for not registering service worker on specific hosts.

Bumped Version to 1.0.1
Updated changelog and readme

Author: SQL-MisterMagoo

Blazor.PWA.MSBuild.Tasks/Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <VersionPrefix>1.0.0</VersionPrefix>
+    <VersionPrefix>1.0.1</VersionPrefix>
     <VersionSuffix>beta$([System.DateTime]::Now.ToString("yyyyMMdd-HHmmss"))</VersionSuffix>
     <VersionSuffix Condition="'$(Configuration)' == 'Release'"></VersionSuffix>
   </PropertyGroup>

Blazor.PWA.MSBuild.Tasks/Templates/ServiceWorker/sw_register.template.js

@@ -1,4 +1,10 @@
 window.updateAvailable = new Promise(function (resolve, reject) {
+    var { hostname } = window.location;
+    if (typeof ignoreHosts !== 'undefined') {
+        if (ignoreHosts.includes(hostname)) {
+            return;
+        }
+    }
     if ('serviceWorker' in navigator) {
         navigator.serviceWorker.register(serviceWorkerFileName)
             .then(function (registration) {

Blazor.PWA.MSBuild.Tasks/build/BlazorPWA.MSBuild.ServiceWorkerRegister.targets

@@ -39,6 +39,10 @@
         const staticCachePrefix = '$(ServiceWorkerCacheName)-v'%3B;
         const updateAlertMessage = '$(ServiceWorkerUpdateAlertText)'%3B;
       </ServiceWorkerRegisterConstants>
+      <ServiceWorkerRegisterConstants Condition="'$(ServiceWorkerIgnoreHosts)' != ''">
+        $(ServiceWorkerRegisterConstants);
+        const ignoreHosts = [$(ServiceWorkerIgnoreHosts)]%3B;
+      </ServiceWorkerRegisterConstants>
       <ServiceWorkerRegisterConstants Condition="'$(ServiceWorkerRegisterInstallableType)' == 'installable-blazor'">
         $(ServiceWorkerRegisterConstants);
         const blazorAssembly = '$(ServiceWorkerBlazorAssembly)'%3B;

CHANGELOG.md

@@ -1,3 +1,7 @@
+#### 11/11/2019
+
+- Added new **Property** **`ServiceWorkerIgnoreHosts`** - used to prevent service worker installation on specific hosts e.g. localhost
+ 
 #### 16/10/2019
 
 - Added new **Property** **`BlazorProjectType`** - used to select the type of Blazor project (SSB/CSB). This property will auto-configure but can be overridden in your csproj file in cases where auto-configure is wrong.

README.md

@@ -155,15 +155,30 @@ The `Name` can be anything you like, but is required by `MSBuild`.
 
 So, this example is excluding all files under the `_redist` folder from the Service Worker Cache.
 
+### Prevent PWA installation / caching on localhost (or any host)
 
+If you want to exclude *localhost* (or any host) so that the developer inner loop is not affected, you can now use the **`ServiceWorkerIgnoreHosts`** property.
+
+Add it to you `csproj` file under `PropertyGroup` and list the hosts you want to exclude.
+
+``` XML
+  <PropertyGroup>
+    <ServiceWorkerIgnoreHosts>'localhost','127.0.0.1','::1','KarensPC'</ServiceWorkerIgnoreHosts>
+  </PropertyGroup>
+```
+
+The service worker will not register itself when the `hostname` matches anything in the list.
+
+*Note: the single quotes around each hostname are required for now*
 
 ## Roadmap
 
 - [ ] At the moment, there is only one choice for caching strategy - Cache First/Network Fallback - I will add more (https://developers.google.com/web/ilt/pwa/introduction-to-progressive-web-app-architectures#caching_strategies_supported_by_sw-toolbox)
 - [x] The current method for alerting the user that the app is installable is semi-hard coded (you can adjust it manually after generation) - this will change to allow hooks/callbacks into Blazor via project properties
-- [ ] The current method for alerting the user when an update is available is semi-hard coded (you can adjust it manually after generation) - this will change to allow hooks/callbacks into Blazor via project properties
+- [x] The current method for alerting the user when an update is available is semi-hard coded (you can adjust it manually after generation) - this will change to allow hooks/callbacks into Blazor via project properties
 - [ ] Document all of the configuration Properties (they all have comments in the code - so you are able to understand their purpose without documentation...)
 - [ ] Bug fixes
+- [x] Allow hosts exclusions - so working on localhost can avoid PWA caching
 
 ## Contribute