Added support for custom cache key provider

.editorconfig

@@ -0,0 +1,147 @@
+####################################################################
+# Editor Configuration (Updated 2022-01-07)
+#
+# (c)2021 superdev GmbH
+####################################################################
+
+root = true
+
+[*.cs]
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents = true
+csharp_indent_labels = one_less_than_current
+csharp_indent_switch_labels = true
+
+csharp_new_line_before_catch = true
+csharp_new_line_before_else = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_open_brace = all
+csharp_new_line_between_query_expression_clauses = true
+
+csharp_prefer_braces = true:error
+csharp_prefer_simple_default_expression = true:error
+csharp_prefer_simple_using_statement = false
+
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = false
+
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_around_declaration_statements = do_not_ignore
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_before_comma = false
+csharp_space_before_dot = false
+csharp_space_before_open_square_brackets = false
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_name_and_open_parenthesis = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = none
+csharp_space_between_square_brackets = false
+
+# Expression-bodied members
+csharp_style_expression_bodied_accessors = true:none
+csharp_style_expression_bodied_constructors = false:none
+csharp_style_expression_bodied_indexers = true:none
+csharp_style_expression_bodied_lambdas = true:none
+csharp_style_expression_bodied_local_functions = false
+csharp_style_expression_bodied_methods = false:none
+csharp_style_expression_bodied_operators = false:none
+csharp_style_expression_bodied_properties = true:silent
+
+csharp_style_conditional_delegate_call = true:error
+csharp_style_inlined_variable_declaration = true:error
+csharp_style_pattern_matching_over_as_with_null_check = true:error
+csharp_style_pattern_matching_over_is_with_cast_check = true:error
+csharp_style_throw_expression = true:suggestion
+csharp_style_var_elsewhere = true:suggestion
+csharp_style_var_for_built_in_types = true:suggestion
+csharp_style_var_when_type_is_apparent = true:error
+csharp_style_implicit_object_creation_when_type_is_apparent = false
+csharp_style_prefer_switch_expression = false
+
+dotnet_sort_system_directives_first = true
+dotnet_style_coalesce_expression = true:error
+dotnet_style_collection_initializer = true:error
+dotnet_style_explicit_tuple_names = true:error
+dotnet_style_null_propagation = true:error
+dotnet_style_object_initializer = true:none
+dotnet_style_predefined_type_for_locals_parameters_members = true:error
+dotnet_style_predefined_type_for_member_access = true:error
+
+dotnet_style_qualification_for_event = true:error
+dotnet_style_qualification_for_field = true:error
+dotnet_style_qualification_for_method = true:error
+dotnet_style_qualification_for_property = true:error
+
+end_of_line = crlf
+indent_size = 4
+indent_style = space
+insert_final_newline = false
+tab_width = 4
+
+dotnet_naming_symbols.private_field_symbol.applicable_kinds = field
+dotnet_naming_symbols.private_field_symbol.applicable_accessibilities = private
+dotnet_naming_style.private_field_style.capitalization = camel_case
+dotnet_naming_rule.private_fields_are_camel_case.severity = error
+dotnet_naming_rule.private_fields_are_camel_case.symbols = private_field_symbol
+dotnet_naming_rule.private_fields_are_camel_case.style = private_field_style
+
+dotnet_naming_symbols.non_private_field_symbol.applicable_kinds = field
+dotnet_naming_symbols.non_private_field_symbol.applicable_accessibilities = public,internal,friend,protected,protected_internal,protected_friend
+dotnet_naming_style.non_private_field_style.capitalization = pascal_case
+dotnet_naming_rule.non_private_fields_are_pascal_case.severity = error
+dotnet_naming_rule.non_private_fields_are_pascal_case.symbols = non_private_field_symbol
+dotnet_naming_rule.non_private_fields_are_pascal_case.style = non_private_field_style
+
+dotnet_naming_symbols.parameter_symbol.applicable_kinds = parameter
+dotnet_naming_style.parameter_style.capitalization = camel_case
+dotnet_naming_rule.parameters_are_camel_case.severity = error
+dotnet_naming_rule.parameters_are_camel_case.symbols = parameter_symbol
+dotnet_naming_rule.parameters_are_camel_case.style = parameter_style
+
+dotnet_naming_symbols.non_interface_type_symbol.applicable_kinds = class,struct,enum,delegate
+dotnet_naming_style.non_interface_type_style.capitalization = pascal_case
+dotnet_naming_rule.non_interface_types_are_pascal_case.severity = error
+dotnet_naming_rule.non_interface_types_are_pascal_case.symbols = non_interface_type_symbol
+dotnet_naming_rule.non_interface_types_are_pascal_case.style = non_interface_type_style
+
+dotnet_naming_symbols.interface_type_symbol.applicable_kinds = interface
+dotnet_naming_style.interface_type_style.capitalization = pascal_case
+dotnet_naming_style.interface_type_style.required_prefix = I
+dotnet_naming_rule.interface_types_must_be_prefixed_with_I.severity = error
+dotnet_naming_rule.interface_types_must_be_prefixed_with_I.symbols = interface_type_symbol
+dotnet_naming_rule.interface_types_must_be_prefixed_with_I.style = interface_type_style
+
+dotnet_naming_symbols.member_symbol.applicable_kinds = method,property,event
+dotnet_naming_style.member_style.capitalization = pascal_case
+dotnet_naming_rule.members_are_pascal_case.severity = error
+dotnet_naming_rule.members_are_pascal_case.symbols = member_symbol
+dotnet_naming_rule.members_are_pascal_case.style = member_style
+
+dotnet_naming_rule.static_fields_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.static_fields_should_be_pascal_case.symbols = static_fields
+dotnet_naming_rule.static_fields_should_be_pascal_case.style = static_field_style
+dotnet_naming_symbols.static_fields.applicable_kinds = field
+dotnet_naming_symbols.static_fields.applicable_accessibilities = *
+dotnet_naming_symbols.static_fields.required_modifiers = static
+dotnet_naming_style.static_field_style.capitalization = pascal_case
+
+# CS4014: Because this call is not awaited, execution of the current method continues before the call is completed
+dotnet_diagnostic.CS4014.severity = error
+
+# IDE0051: Remove unused private members
+dotnet_diagnostic.IDE0051.severity = warning

HttpClient.Caching.sln

@@ -13,6 +13,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 	ProjectSection(SolutionItems) = preProject
 		build.yml = build.yml
 		README.md = README.md
+		.gitignore = .gitignore
+		.editorconfig = .editorconfig
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ConsoleAppSample", "Samples\ConsoleAppSample\ConsoleAppSample.csproj", "{592B2324-79AA-4973-8CE5-F65BD503641F}"

HttpClient.Caching/Abstractions/ICacheKeysProvider.cs

@@ -0,0 +1,17 @@
+using System.Net.Http;
+
+namespace Microsoft.Extensions.Caching.Abstractions
+{
+    /// <summary>
+    ///     Provides keys to store or retrieve data in the cache
+    /// </summary>
+    public interface ICacheKeysProvider
+    {
+        /// <summary>
+        ///     Return the key for the request message <paramref name="request"/>
+        /// </summary>
+        /// <param name="request"></param>
+        /// <returns></returns>
+        string GetKey(HttpRequestMessage request);
+    }
+}

HttpClient.Caching/HttpClient.Caching.csproj

@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net45;netstandard1.2;netstandard2.0;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>net452;netstandard1.2;netstandard2.0;netstandard2.1</TargetFrameworks>
     <Authors>Thomas Galliker</Authors>
     <Company>superdev GmbH</Company>
     <Description>HttpClient.Caching adds http response caching to HttpClient.</Description>
-    <Copyright>Copyright 2021</Copyright>
+    <Copyright>Copyright 2022</Copyright>
     <PackageProjectUrl>https://github.com/thomasgalliker/HttpClient.Caching</PackageProjectUrl>
     <PackageIconUrl>https://raw.githubusercontent.com/thomasgalliker/HttpClient.Caching/master/logo.png</PackageIconUrl>
     <RepositoryUrl>https://github.com/thomasgalliker/HttpClient.Caching</RepositoryUrl>
@@ -21,7 +21,7 @@
 		<PackageReference Include="Newtonsoft.Json" Version="[11.0.2,)" />
 	</ItemGroup>
 
-	<ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
+	<ItemGroup Condition=" '$(TargetFramework)' == 'net452' ">
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Configuration" />
     <Reference Include="System.Core" />

HttpClient.Caching/InMemory/DefaultCacheKeysProvider.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Net.Http;
+using System.Text;
+using Microsoft.Extensions.Caching.Abstractions;
+
+namespace Microsoft.Extensions.Caching.InMemory
+{
+    /// <summary>
+    ///     Provides keys to store or retrieve data in the cache in the default way (http method + http request Uri)
+    /// </summary>
+    public class DefaultCacheKeysProvider : ICacheKeysProvider
+    {
+        /// <summary>
+        ///     Return the key for the request message <paramref name="request"/> by composing a string
+        ///     with <see cref="HttpRequestMessage.Method"/> and <see cref="HttpRequestMessage.RequestUri"/>
+        /// </summary>
+        /// <param name="request"></param>
+        /// <returns>
+        ///     An example of return value: "MET_GET;URI_https://www.google.it"
+        /// </returns>
+        public string GetKey(HttpRequestMessage request)
+        {
+            if (request is null)
+            {
+                throw new ArgumentNullException(nameof(request));
+            }
+
+            var sb = new StringBuilder();
+
+            sb.AppendFormat("MET_{0};", request.Method);
+            sb.AppendFormat("URI_{0};", request.RequestUri);
+
+            return sb.ToString();
+        }
+    }
+}

HttpClient.Caching/InMemory/InMemoryCacheHandler.cs

@@ -19,6 +19,12 @@ public class InMemoryCacheHandler : DelegatingHandler
         private readonly IDictionary<HttpStatusCode, TimeSpan> cacheExpirationPerHttpResponseCode;
         private readonly IMemoryCache responseCache;
 
+        /// <summary>
+        /// Cache key provider being used
+        /// </summary>
+        public ICacheKeysProvider CacheKeysProvider { get; }
+
+
         /// <summary>
         ///     Create a new InMemoryCacheHandler.
         /// </summary>
@@ -31,8 +37,20 @@ public class InMemoryCacheHandler : DelegatingHandler
         ///     An <see cref="IStatsProvider" /> that records statistic information about the caching
         ///     behavior.
         /// </param>
-        public InMemoryCacheHandler(HttpMessageHandler innerHandler = null, IDictionary<HttpStatusCode, TimeSpan> cacheExpirationPerHttpResponseCode = null, IStatsProvider statsProvider = null)
-            : this(innerHandler, cacheExpirationPerHttpResponseCode, statsProvider, new MemoryCache(new MemoryCacheOptions()))
+        /// <param name="cacheKeysProvider">
+        ///     An <see cref="ICacheKeysProvider"/> that provides keys to retrieve and store items in the cache
+        /// </param>
+        public InMemoryCacheHandler(HttpMessageHandler innerHandler = null,
+            IDictionary<HttpStatusCode, TimeSpan> cacheExpirationPerHttpResponseCode = null,
+            IStatsProvider statsProvider = null,
+            ICacheKeysProvider cacheKeysProvider = null)
+            : this(
+                  innerHandler,
+                  cacheExpirationPerHttpResponseCode,
+                  statsProvider,
+                  new MemoryCache(new MemoryCacheOptions()),
+                  cacheKeysProvider
+                  )
         {
         }
 
@@ -49,12 +67,19 @@ public InMemoryCacheHandler(HttpMessageHandler innerHandler = null, IDictionary<
         ///     behavior.
         /// </param>
         /// <param name="cache">The cache to be used.</param>
-        internal InMemoryCacheHandler(HttpMessageHandler innerHandler, IDictionary<HttpStatusCode, TimeSpan> cacheExpirationPerHttpResponseCode, IStatsProvider statsProvider, IMemoryCache cache)
+        /// <param name="cacheKeysProvider">The <see cref="ICacheKeysProvider"/> cache keys provider to use</param>
+        internal InMemoryCacheHandler(
+            HttpMessageHandler innerHandler,
+            IDictionary<HttpStatusCode, TimeSpan> cacheExpirationPerHttpResponseCode,
+            IStatsProvider statsProvider,
+            IMemoryCache cache,
+            ICacheKeysProvider cacheKeysProvider)
             : base(innerHandler ?? new HttpClientHandler())
         {
             this.StatsProvider = statsProvider ?? new StatsProvider(nameof(InMemoryCacheHandler));
             this.cacheExpirationPerHttpResponseCode = cacheExpirationPerHttpResponseCode ?? new Dictionary<HttpStatusCode, TimeSpan>();
             this.responseCache = cache ?? new MemoryCache(new MemoryCacheOptions());
+            this.CacheKeysProvider = cacheKeysProvider ?? new DefaultCacheKeysProvider();
         }
 
         /// <summary>
@@ -67,7 +92,8 @@ public void InvalidateCache(Uri uri, HttpMethod method = null)
             var methods = method != null ? new[] { method } : new[] { HttpMethod.Get, HttpMethod.Head };
             foreach (var m in methods)
             {
-                var key = m + uri.ToString();
+                var request = new HttpRequestMessage(m, uri);
+                var key = CacheKeysProvider.GetKey(request);
                 this.responseCache.Remove(key);
             }
         }
@@ -78,7 +104,7 @@ public void InvalidateCache(Uri uri, HttpMethod method = null)
         /// <returns>The HttpResponseMessage from cache, or a newly invoked one.</returns>
         protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
         {
-            var key = request.Method + request.RequestUri.ToString();
+            var key = this.CacheKeysProvider.GetKey(request);
             // gets the data from cache, and returns the data if it's a cache hit
             if (request.Method == HttpMethod.Get || request.Method == HttpMethod.Head)
             {

HttpClient.Caching/InMemory/MethodUriHeadersCacheKeysProvider.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Linq;
+using System.Net.Http;
+using System.Text;
+using Microsoft.Extensions.Caching.Abstractions;
+
+namespace Microsoft.Extensions.Caching.InMemory
+{
+    /// <summary>
+    ///     Provides keys to store or retrieve data in the cache by using http method, specific headers and Uri
+    /// </summary>
+    public class MethodUriHeadersCacheKeysProvider : ICacheKeysProvider
+    {
+        private readonly string[] headersName;
+
+        /// <summary>
+        ///     Initialize the cache key provider passing the headers name that will be used to compose <paramref name="headersName"/>
+        /// </summary>
+        /// <param name="headersName"></param>
+        public MethodUriHeadersCacheKeysProvider(string[] headersName)
+        {
+            if (headersName != null)
+            {
+                this.headersName = headersName.OrderBy(i => i).ToArray();
+            }
+        }
+
+        /// <summary>
+        ///     Return the key for the request message <paramref name="request"/> by composing a string
+        ///     with <see cref="HttpRequestMessage.Method"/>, <see cref="HttpRequestMessage.Headers"/> and <see cref="HttpRequestMessage.RequestUri"/>
+        /// </summary>
+        /// <param name="request"></param>
+        /// <returns>
+        ///     An example of return value: "MET_GET;HEA_X-KID_389dfhuif;URI_https://www.google.it?par1=65&par2=20;"
+        /// </returns>
+        public string GetKey(HttpRequestMessage request)
+        {
+            if (request is null)
+            {
+                throw new ArgumentNullException(nameof(request));
+            }
+
+            var sb = new StringBuilder();
+
+            sb.AppendFormat("MET_{0};", request.Method);
+            if (this.headersName != null)
+            {
+                foreach (var headerName in this.headersName)
+                {
+                    if (request.Headers.Contains(headerName))
+                    {
+                        sb.AppendFormat("HEA_{0}_{1};", headerName, this.GetHeaderValue(request, headerName));
+                    }
+                }
+            }
+
+            sb.AppendFormat("URI_{0};", request.RequestUri);
+
+            return sb.ToString();
+        }
+
+        private string GetHeaderValue(HttpRequestMessage request, string headerName)
+        {
+            if (request is null)
+            {
+                throw new ArgumentNullException(nameof(request));
+            }
+
+            if (string.IsNullOrEmpty(headerName))
+            {
+                throw new ArgumentException($"'{nameof(headerName)}' cannot be null or empty.", nameof(headerName));
+            }
+
+            var orderedHeaderValues = string.Empty;
+
+            var headerValues = request.Headers.GetValues(headerName);
+            if (headerValues != null)
+            {
+                orderedHeaderValues = string.Join(",", headerValues.OrderBy(i => i));
+            }
+
+            return orderedHeaderValues;
+        }
+    }
+}