add text/html content parser as string content (#5460)

* add text/html content parser as string content

* add text/html content parser in configuration

---------

Co-authored-by: Jérémie DEVILLARD <jdevillard@users.noreply.github.com>

src/modules/Elsa.Http/Features/HttpFeature.cs

@@ -161,7 +161,8 @@ public class HttpFeature : FeatureBase
             // Content parsers.
             .AddSingleton<IHttpContentParser, JsonHttpContentParser>()
             .AddSingleton<IHttpContentParser, XmlHttpContentParser>()
-            .AddSingleton<IHttpContentParser, PlainTextHttpContentParser>()
+            .AddSingleton<IHttpContentParser, PlainTextHttpContentParser>()
+            .AddSingleton<IHttpContentParser, TextHtmlHttpContentParser>()
 
             // HTTP content factories.
             .AddScoped<IHttpContentFactory, TextContentFactory>()

src/modules/Elsa.Http/Parsers/TextHtmlHttpContentParser.cs

@@ -0,0 +1,24 @@
+using Elsa.Http.Contracts;
+
+namespace Elsa.Http.Parsers;
+
+/// <summary>
+/// Reads text/html content type streams.
+/// </summary>
+// TODO: found a library to use a Html Content Parser and use a complexe object Type, until this, this class allow to accept request send using text/html content-type
+public class TextHtmlHttpContentParser : IHttpContentParser
+{
+    /// <inheritdoc />
+    public int Priority => 0;
+
+    /// <inheritdoc />
+    public bool GetSupportsContentType(string contentType) => contentType.Contains("text/html", StringComparison.InvariantCultureIgnoreCase);
+
+    /// <inheritdoc />
+    public async Task<object> ReadAsync(Stream content, Type? returnType, CancellationToken cancellationToken)
+    {
+        using var reader = new StreamReader(content, leaveOpen: true);
+        var stringContent = await reader.ReadToEndAsync();
+        return stringContent;
+    }
+}