LowercaseDocumentFilter.cs

using System.Collections.Generic;
using System.Web.Http.Description;
using Swashbuckle.Swagger;

namespace BoundedContext.Web.Swagger
{
	public class LowercaseDocumentFilter : IDocumentFilter
	{
		public void Apply(SwaggerDocument swaggerDoc, SchemaRegistry schemaRegistry, IApiExplorer apiExplorer)
		{
			////////	PATHS
			
			var paths = swaggerDoc.paths;

			//	generate the new keys
			var newPaths = new Dictionary<string, PathItem>();
			var removeKeys = new List<string>();
			foreach (var path in paths)
			{
				var newKey = path.Key.ToLower();
				if (newKey != path.Key)
				{
					removeKeys.Add(path.Key);
					newPaths.Add(newKey, path.Value);
				}
			}

			//	add the new keys
			foreach (var path in newPaths)
			{
				swaggerDoc.paths.Add(path.Key, path.Value);
			}

			//	remove the old keys
			foreach (var key in removeKeys)
			{
				swaggerDoc.paths.Remove(key);
			}
		}
	}
}