#102: Moving Models and constants to their own library (#104)

* #102: Moving Models and constants to their own library

* #102: Updated sln file

* #102: Updated README to include step install migration tool

Icarus/Authorization/Handlers/HasScopeHandler.cs

@@ -0,0 +1,26 @@
+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;
+    }
+}