Add CacheKeyCaseSensitive option

Author: ronaldbarendse

src/ImageSharp.Web/Caching/CacheKey.cs

@@ -13,7 +13,7 @@ namespace SixLabors.ImageSharp.Web.Caching
     public class CacheKey : ICacheKey
     {
         /// <inheritdoc/>
-        public string Create(HttpContext context, CommandCollection commands)
+        public string Create(HttpContext context, CommandCollection commands, bool caseSensitive)
         {
             var sb = new StringBuilder(context.Request.Host.ToString());
 
@@ -31,7 +31,7 @@ public string Create(HttpContext context, CommandCollection commands)
 
             sb.Append(QueryString.Create(commands));
 
-            return sb.ToString().ToLowerInvariant();
+            return caseSensitive ? sb.ToString() : sb.ToString().ToLowerInvariant();
         }
     }
 }

src/ImageSharp.Web/Caching/ICacheKey.cs

@@ -16,9 +16,10 @@ public interface ICacheKey
         /// </summary>
         /// <param name="context">The HTTP context.</param>
         /// <param name="commands">The commands.</param>
+        /// <param name="caseSensitive">If set to <c>true</c> the cache key should be generated in a case sensitive manner.</param>
         /// <returns>
         /// The cache key.
         /// </returns>
-        string Create(HttpContext context, CommandCollection commands);
+        string Create(HttpContext context, CommandCollection commands, bool caseSensitive);
     }
 }

src/ImageSharp.Web/Caching/UriAbsoluteCacheKey.cs

@@ -13,17 +13,11 @@ namespace SixLabors.ImageSharp.Web.Caching
     public class UriAbsoluteCacheKey : ICacheKey
     {
         /// <inheritdoc/>
-        public virtual string Create(HttpContext context, CommandCollection commands)
-            => UriHelper.BuildAbsolute(context.Request.Scheme, context.Request.Host, context.Request.PathBase, context.Request.Path, QueryString.Create(commands));
-    }
+        public string Create(HttpContext context, CommandCollection commands, bool caseSensitive)
+        {
+            string cacheKey = UriHelper.BuildAbsolute(context.Request.Scheme, context.Request.Host, context.Request.PathBase, context.Request.Path, QueryString.Create(commands));
 
-    /// <summary>
-    /// Creates a cache key based on the lowercased request scheme, host, path and commands.
-    /// </summary>
-    public class UriAbsoluteLowercaseCacheKey : UriAbsoluteCacheKey
-    {
-        /// <inheritdoc/>
-        public override string Create(HttpContext context, CommandCollection commands)
-            => base.Create(context, commands).ToLowerInvariant();
+            return caseSensitive ? cacheKey : cacheKey.ToLowerInvariant();
+        }
     }
 }

src/ImageSharp.Web/Caching/UriRelativeCacheKey.cs

@@ -13,17 +13,11 @@ namespace SixLabors.ImageSharp.Web.Caching
     public class UriRelativeCacheKey : ICacheKey
     {
         /// <inheritdoc/>
-        public virtual string Create(HttpContext context, CommandCollection commands)
-            => UriHelper.BuildRelative(context.Request.PathBase, context.Request.Path, QueryString.Create(commands));
-    }
+        public string Create(HttpContext context, CommandCollection commands, bool caseSensitive)
+        {
+            string cacheKey = UriHelper.BuildRelative(context.Request.PathBase, context.Request.Path, QueryString.Create(commands));
 
-    /// <summary>
-    /// Creates a cache key based on the lowercased request path and commands.
-    /// </summary>
-    public class UriRelativeLowercaseCacheKey : UriRelativeCacheKey
-    {
-        /// <inheritdoc/>
-        public override string Create(HttpContext context, CommandCollection commands)
-            => base.Create(context, commands).ToLowerInvariant();
+            return caseSensitive ? cacheKey : cacheKey.ToLowerInvariant();
+        }
     }
 }

src/ImageSharp.Web/Middleware/ImageSharpMiddleware.cs

@@ -269,7 +269,7 @@ private async Task ProcessRequestAsync(
             CommandCollection commands)
         {
             // Create a cache key and hash
-            string cacheKey = this.cacheKey.Create(context, commands);
+            string cacheKey = this.cacheKey.Create(context, commands, this.options.CacheKeyCaseSensitive);
             string cacheHash = this.cacheHash.Create(cacheKey, this.options.CachedNameLength);
 
             // Check the cache, if present, not out of date and not requiring an update

src/ImageSharp.Web/Middleware/ImageSharpMiddlewareOptions.cs

@@ -84,6 +84,11 @@ public class ImageSharpMiddlewareOptions
         /// </summary>
         public TimeSpan CacheMaxAge { get; set; } = TimeSpan.FromDays(365);
 
+        /// <summary>
+        /// Gets or sets a value indicating whether the cache key should be case sensitive.
+        /// </summary>
+        public bool CacheKeyCaseSensitive { get; set; } = false;
+
         /// <summary>
         /// Gets or sets the length of the filename to use (minus the extension) when storing
         /// images in the image cache. Defaults to 12 characters.