Add wildcard cors feature, update readme.

Author: stefangordon

Options.cs

@@ -19,22 +19,22 @@ class Options
         public string StorageKey { get; set; }
 
         [Option('c', "connectionstring", Required = false, MutuallyExclusiveSet = "ConnectionString",
-            HelpText = "Storage account key.")]
+            HelpText = "Storage account connection string.")]
         public string ConnectionString { get; set; }
 
         [OptionArray('e', "extensions", Required = true,
             HelpText = "Extensions to operate on. [.js, .css, .dat]")]
         public string[] Extensions { get; set; }
 
-        [Option('r', "replace", Required = false, DefaultValue = false, 
+        [Option('r', "replace", Required = false, DefaultValue = false,
             HelpText = "Replace existing files in-place.")]
         public bool Replace { get; set; }
 
         [Option('s', "simulate", Required = false, DefaultValue = false,
             HelpText = "Do everything except write to blob store.")]
         public bool Simulate { get; set; }
 
-        [Option('n', "newextension", Required = false, 
+        [Option('n', "newextension", Required = false,
             HelpText = "Copy file with a new postfix. [.gz]")]
         public string NewExtension { get; set; }
 
@@ -46,14 +46,18 @@ class Options
             HelpText = "Duration for cache control max age header, in seconds.  Default 2592000 (30 days).")]
         public int MaxAgeSeconds { get; set; }
 
+        [Option('w', "wildcardcors", Required = false, DefaultValue = false,
+            HelpText = "Enable wildcard CORS for this storage account.")]
+        public bool wildcard { get; set; }
+
 
         [HelpOption]
         public string GetUsage()
         {
             var help = new HelpText
             {
                 Heading = new HeadingInfo("Azure Storage GZip Encoder", "1.0"),
-                Copyright = new CopyrightInfo("Stefan Gordon", 2016),                
+                Copyright = new CopyrightInfo("Stefan Gordon", 2016),
                 AdditionalNewLineAfterOption = true,
                 AddDashesToOption = true
             };

Program.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -43,13 +44,16 @@ static void Main(string[] args)
                 CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
                 CloudBlobContainer blobContainer = blobClient.GetContainerReference(options.Container);
 
+                // Do the compression work
                 Utility.EnsureGzipFiles(blobContainer, options.Extensions, options.Replace, options.NewExtension, options.MaxAgeSeconds, options.Simulate);
 
-            }
-            else
-            {
-                // Display the default usage information
-                //Console.WriteLine(options.GetUsage());
+                // Enable CORS if appropriate
+                if (options.wildcard)
+                {
+                    Utility.SetWildcardCorsOnBlobService(storageAccount);
+                }
+
+                Trace.TraceInformation("Complete.");                
             }
         }
     }

README.md

@@ -1,7 +1,7 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/5b7d5wk4pwv21htt?svg=true)](https://ci.appveyor.com/project/stefangordon/azure-storage-gzip-encoding)
 
 # Azure Storage GZip Encoding
-A utility to automatically configure [HTTP Compression](https://en.wikipedia.org/wiki/HTTP_compression) for blobs in Azure Blob storage.  Blobs can be consumed directly from a client browser or via Azure CDN.  
+A utility to automatically configure [HTTP Compression](https://en.wikipedia.org/wiki/HTTP_compression) for blobs in Azure Blob storage.  Blobs can be consumed directly from a client browser or via Azure CDN.
 
 This tool is inspired by a code sample from David Rousset for optimizing BablyonJS Assets.
 
@@ -15,6 +15,8 @@ Managing this manual compression and configuration of headers yourself would be
 ## What it does
 The utility can enumerate all of the files in a container.  It then filters to files matching your provided extensions.  These files are compressed using GZip and the content-encoding and cache headers are configured on them so they are compatible with all browsers HTTP compression features.  The tool will not alter a file which is already compressed (based on inspecting the headers), so it is safe to run multiple times to catch new files.
 
+The utility can also automatically configure your storage account with wildcard CORS settings which are often desirable if serving certain types of assets through Azure CDN.
+
 ## Getting Started
 You must provide
 - Either an account name and key, or connection string
@@ -30,6 +32,12 @@ Replacing .css files in-place.  Blobs will be replaced with compressed version a
 Copy .css and .js to a compressed version and append a .gz extension:
 `asge.exe -e .css .js -f myContainer -n .gz -a myStorageAccount -k <key>`
 
+Replacing .js files in-place and enabling CORS for the account:
+`asge.exe -w -e .js -f myContainer -r -a myStorageAccount -k <key>`
+
+Replacing .js files in-place using a connection string instead of host/key:
+`asge.exe -e .js -f myContainer -r -c <connection string>`
+
 ```
   -a, --account             Storage account host. [mystorage]
 
@@ -49,13 +57,13 @@ Copy .css and .js to a compressed version and append a .gz extension:
 
   -f, --container           Required. Container to search in.
 
+  -w, --wildcardcors        Enable wildcard CORS for this storage account.
+
   -x, --cacheage            (Default: 2592000) Duration for cache control max
                             age header, in seconds.  Default 2592000 (30 days).
 
   --help                    Display this help screen.
 ```
 
 ## Current State
-Only block blobs are supported.
-
-The tool has had only light testing at this point.  Ensure that you have backups of all your binary data before running the tool so that you can recover in the event a blob is corrupted.
+Only block blobs are supported.  Please ensure you have a backup of your data before running this tool against your container.

Utility.cs

@@ -12,7 +12,7 @@
 
 namespace ASGE
 {
-    class Utility
+    static class Utility
     {
         public static void EnsureGzipFiles(CloudBlobContainer container, IEnumerable<string> extensions, bool inPlace, string newExtension, int cacheControlMaxAgeSeconds, bool simulate)
         {
@@ -104,16 +104,22 @@ public static void EnsureGzipFiles(CloudBlobContainer container, IEnumerable<str
             });
         }
 
-
-        //acc.SetCORSPropertiesOnBlobService(cors => {
-        //    var wildcardRule = new CorsRule() { AllowedMethods = CorsHttpMethods.Get, AllowedOrigins = { "*" } };
-        //cors.CorsRules.Add(wildcardRule);
-        //    return cors;
-        //});
+        public static void SetWildcardCorsOnBlobService(this CloudStorageAccount storageAccount)
+        {
+            storageAccount.SetCORSPropertiesOnBlobService(cors =>
+            {
+                var wildcardRule = new CorsRule() { AllowedMethods = CorsHttpMethods.Get, AllowedOrigins = { "*" } };
+                cors.CorsRules.Clear();
+                cors.CorsRules.Add(wildcardRule);
+                return cors;
+            });
+        }            
 
         public static void SetCORSPropertiesOnBlobService(this CloudStorageAccount storageAccount,
             Func<CorsProperties, CorsProperties> alterCorsRules)
         {
+            Trace.TraceInformation("Configuring CORS.");
+
             if (storageAccount == null || alterCorsRules == null) throw new ArgumentNullException();
 
             CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();