Inital project setup

OpenArchival.Blazor/Components/Account/Shared/ExternalLoginPicker.razor

@@ -0,0 +1,44 @@
+@using Microsoft.AspNetCore.Authentication
+@using Microsoft.AspNetCore.Identity
+@using MudBlazor
+@using OpenArchival.Blazor.Data
+@using MudBlazor.StaticInput
+
+@inject SignInManager<ApplicationUser> SignInManager
+@inject IdentityRedirectManager RedirectManager
+
+@if (externalLogins.Length == 0)
+{
+    <MudAlert Variant="Variant.Text" Severity="Severity.Warning">There are no external authentication services configured.</MudAlert>
+    <MudText Typo="Typo.body1" Class="pt-4">
+        See <MudLink Target="_blank" Href="https://go.microsoft.com/fwlink/?LinkID=532715">this article</MudLink>
+        about setting up this ASP.NET application to support logging in via external services
+    </MudText>
+}
+else
+{
+    <form class="form-horizontal" action="Account/PerformExternalLogin" method="post">
+        <div>
+            <AntiforgeryToken />
+            <input type="hidden" name="ReturnUrl" value="@ReturnUrl" />
+            <p>
+                @foreach (var provider in externalLogins)
+                {
+                    <button type="submit" class="btn btn-primary" name="provider" value="@provider.Name" title="Log in using your @provider.DisplayName account">@provider.DisplayName</button>
+                }
+            </p>
+        </div>
+    </form>
+}
+
+@code {
+    private AuthenticationScheme[] externalLogins = [];
+
+    [SupplyParameterFromQuery]
+    private string? ReturnUrl { get; set; }
+
+    protected override async Task OnInitializedAsync()
+    {
+        externalLogins = (await SignInManager.GetExternalAuthenticationSchemesAsync()).ToArray();
+    }
+}