Implemented Auth0 functionality to handler authentication. Not complete, will add to it some more. #15

Authorization/Handlers/HasScopeHandler.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+
+using Microsoft.AspNetCore.Authorization;
+
+using Icarus.Authorization;
+
+namespace Icarus.Authorization.Handlers
+{
+	public class HasScopeHandler : AuthorizationHandler<HasScopeRequirement>
+	{
+		protected override Task HandleRequirementAsync(AuthorizationHandlerContext context,
+													  HasScopeRequirement requirement)
+		{
+			if (!context.User.HasClaim(c => c.Type == "scope" && c.Issuer == requirement.Issuer))
+			{
+				return Task.CompletedTask;
+			}
+
+			var scopes = context.User.FindFirst(c => c.Type == "scope" && 
+											   c.Issuer == requirement.Issuer).Value.Split(' ');
+
+			if (scopes.Any(s => s == requirement.Scope))
+			{
+				context.Succeed(requirement);
+			}
+
+			return Task.CompletedTask;
+		}
+	}
+}

Authorization/HasScopeRequirement.cs

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+using System;
+
+using Microsoft.AspNetCore.Authorization;
+
+namespace Icarus.Authorization
+{
+	public class HasScopeRequirement : IAuthorizationRequirement
+	{
+		public string Issuer { get; }
+		public string Scope { get; }
+
+
+		public HasScopeRequirement(string scope, string issuer)
+		{
+			Scope = scope ?? throw new ArgumentNullException(nameof(scope));
+			Issuer = issuer ?? throw new ArgumentNullException(nameof(issuer));
+		}
+	}
+}