Add reference ICacheKey implementations for absolute and relative URI keys

Author: ronaldbarendse

src/ImageSharp.Web/Caching/UriAbsoluteCacheKey.cs

@@ -0,0 +1,29 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.Extensions;
+using SixLabors.ImageSharp.Web.Commands;
+
+namespace SixLabors.ImageSharp.Web.Caching
+{
+    /// <summary>
+    /// Creates a cache key based on the request scheme, host, path and commands.
+    /// </summary>
+    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));
+    }
+
+    /// <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();
+    }
+}

src/ImageSharp.Web/Caching/UriRelativeCacheKey.cs

@@ -0,0 +1,29 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.Extensions;
+using SixLabors.ImageSharp.Web.Commands;
+
+namespace SixLabors.ImageSharp.Web.Caching
+{
+    /// <summary>
+    /// Creates a cache key based on the request path and commands.
+    /// </summary>
+    public class UriRelativeCacheKey : ICacheKey
+    {
+        /// <inheritdoc/>
+        public virtual string Create(HttpContext context, CommandCollection commands)
+            => 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();
+    }
+}