reworked admin auth to use form and cookie + adjusted oauth to support API and cookie-based auth

app/src/ui/modules/server/FlashMessage.tsx

@@ -0,0 +1,39 @@
+import { getFlashMessage } from "core/server/flash";
+import { useEffect, useState } from "react";
+import { Alert } from "ui/components/display/Alert";
+
+/**
+ * Handles flash message from server
+ * @constructor
+ */
+export function FlashMessage() {
+   const [flash, setFlash] = useState<any>();
+
+   useEffect(() => {
+      if (!flash) {
+         const content = getFlashMessage();
+         if (content) {
+            setFlash(content);
+         }
+      }
+   }, []);
+
+   if (flash) {
+      let Component = Alert.Info;
+      switch (flash.type) {
+         case "error":
+            Component = Alert.Exception;
+            break;
+         case "success":
+            Component = Alert.Success;
+            break;
+         case "warning":
+            Component = Alert.Warning;
+            break;
+      }
+
+      return <Component message={flash.message} className="justify-center" />;
+   }
+
+   return null;
+}