added admin system

src/app/actions/manage-users.ts

@@ -0,0 +1,36 @@
+"use server";
+
+import db from "@/lib/db";
+import { user } from "@/lib/model/auth-schema";
+import { eq } from "drizzle-orm";
+import { requireAdmin } from "@/lib/auth";
+
+export async function deleteUser(userId: string) {
+  const result = await requireAdmin();
+  
+  if (!result.authenticated || !result.admin) {
+    throw new Error("Unauthorized");
+  }
+
+  await db.delete(user).where(eq(user.id, userId));
+}
+
+export async function setUserAdmin(userId: string, isAdmin: boolean) {
+  const result = await requireAdmin();
+  
+  if (!result.authenticated || !result.admin) {
+    throw new Error("Unauthorized");
+  }
+
+  await db.update(user).set({ admin: isAdmin }).where(eq(user.id, userId));
+}
+
+export async function getAllUsers() {
+  const result = await requireAdmin();
+  
+  if (!result.authenticated || !result.admin) {
+    throw new Error("Unauthorized");
+  }
+
+  return db.select().from(user);
+}

src/app/admin/datasets/[id]/entries/[entryId]/page.tsx

@@ -3,6 +3,8 @@ import db from '@/lib/db';
 import { dataset_entry } from '@/lib/model/dataset_entry';
 import { eq } from 'drizzle-orm';
 import AudioPlayer from '@/components/AudioPlayer';
+import { requireAdmin } from '@/lib/auth';
+import { redirect } from 'next/navigation';
 
 interface DatasetEntryPageProps {
   params: {
@@ -12,6 +14,16 @@ interface DatasetEntryPageProps {
 }
 
 export default async function DatasetEntryPage({ params }: DatasetEntryPageProps) {
+  const result = await requireAdmin();
+
+  if (!result.authenticated) {
+    redirect("/user/sign-in");
+  }
+
+  if (!result.admin) {
+    redirect("/");
+  }
+
   const { id: datasetId, entryId } = await params;
   const datasetIdNum = parseInt(datasetId, 10);
   const entryIdNum = parseInt(entryId, 10);

src/app/admin/datasets/[id]/page.tsx

@@ -6,6 +6,8 @@ import EditableDatasetHeader from '@/components/EditableDatasetHeader';
 import DatasetEntriesList from '@/components/DatasetEntriesList';
 import UploadDatasetEntriesModal from '@/components/UploadDatasetEntriesModal';
 import RemoveAllEntriesButton from '@/components/RemoveAllEntriesButton';
+import { requireAdmin } from '@/lib/auth';
+import { redirect } from 'next/navigation';
 
 interface DatasetPageProps {
   params: {
@@ -14,6 +16,16 @@ interface DatasetPageProps {
 }
 
 export default async function DatasetPage({ params }: DatasetPageProps) {
+  const result = await requireAdmin();
+
+  if (!result.authenticated) {
+    redirect("/user/sign-in");
+  }
+
+  if (!result.admin) {
+    redirect("/");
+  }
+
   const {id} = await params;
   const datasetId = parseInt(id, 10);
 

src/app/admin/page.tsx

@@ -1,22 +1,39 @@
 import DatasetsList from "@/components/DatasetsList";
 import CreateDatasetModal from "@/components/CreateDatasetModal";
-import { auth } from "@/lib/auth";
-import { headers } from "next/headers";
+import { requireAdmin } from "@/lib/auth";
 import { redirect } from "next/navigation";
+import Link from "next/link";
 
 export default async function AdminPage() {
-    const session = await auth.api.getSession({
-        headers: await headers()
-    })
+    const result = await requireAdmin();
 
-    if(!session) {
-        redirect("/user/sign-in")
+    if (!result.authenticated) {
+        redirect("/user/sign-in");
+    }
+
+    if (!result.admin) {
+        redirect("/");
     }
 
   return (
     <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+      <div className="mb-8">
+        <h1 className="text-3xl font-bold mb-4">Admin Panel</h1>
+        <div className="flex gap-4">
+          <Link
+            href="/admin/users"
+            className="px-4 py-2 bg-blue-500 text-white rounded hover:bg-blue-600"
+          >
+            Manage Users
+          </Link>
+        </div>
+      </div>
+
+      <div className="mt-8">
+        <h2 className="text-2xl font-bold mb-4">Datasets</h2>
         <CreateDatasetModal />
         <DatasetsList />
       </div>
+    </div>
   );
 }

src/app/admin/users/page.tsx

@@ -0,0 +1,39 @@
+import Link from "next/link";
+import UsersList from "@/components/UsersList";
+import { requireAdmin } from "@/lib/auth";
+import { redirect } from "next/navigation";
+import { getAllUsers } from "@/app/actions/manage-users";
+
+export default async function UsersPage() {
+  const result = await requireAdmin();
+
+  if (!result.authenticated) {
+    redirect("/user/sign-in");
+  }
+
+  if (!result.admin) {
+    redirect("/");
+  }
+
+  const users = await getAllUsers();
+
+  return (
+    <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
+      <div className="mb-6">
+        <Link
+          href="/admin"
+          className="text-blue-500 hover:text-blue-600 mb-4 inline-block"
+        >
+          ← Back to Admin
+        </Link>
+        <h1 className="text-3xl font-bold">User Management</h1>
+      </div>
+
+      <div className="bg-white rounded-lg shadow">
+        <div className="p-6">
+          <UsersList users={users} />
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/Header.tsx

@@ -31,6 +31,14 @@ export function Header() {
                   <p className="text-xs text-blue-100 uppercase tracking-wide">Willkommen zurück</p>
                   <p className="text-sm font-semibold">{session.user?.email}</p>
                 </div>
+                {(session.user as any)?.admin && (
+                  <Link
+                    href="/admin"
+                    className="px-4 py-2 bg-yellow-500 hover:bg-yellow-600 active:bg-yellow-700 text-white font-semibold rounded-lg transition-all duration-200 transform hover:scale-105"
+                  >
+                    Admin
+                  </Link>
+                )}
                 <button
                   onClick={handleSignOut}
                   className="px-4 py-2 bg-red-600 hover:bg-red-700 active:bg-red-800 text-white font-semibold rounded-lg transition-all duration-200 transform hover:scale-105"

src/components/UsersList.tsx

@@ -0,0 +1,140 @@
+"use client";
+
+import { deleteUser, setUserAdmin } from "@/app/actions/manage-users";
+import { useState, useMemo } from "react";
+
+interface User {
+  id: string;
+  name: string;
+  email: string;
+  admin: boolean;
+  createdAt: Date;
+}
+
+interface UsersListProps {
+  users: User[];
+}
+
+export default function UsersList({ users: initialUsers }: UsersListProps) {
+  const [users, setUsers] = useState(initialUsers);
+  const [loading, setLoading] = useState<string | null>(null);
+  const [search, setSearch] = useState("");
+
+  const filteredUsers = useMemo(() => {
+    const query = search.toLowerCase();
+    return users.filter(
+      (u) =>
+        u.email.toLowerCase().includes(query) ||
+        u.name.toLowerCase().includes(query)
+    );
+  }, [users, search]);
+
+  const handleDeleteUser = async (userId: string) => {
+    if (!confirm("Are you sure you want to delete this user?")) {
+      return;
+    }
+
+    setLoading(userId);
+    try {
+      await deleteUser(userId);
+      setUsers(users.filter((u) => u.id !== userId));
+    } catch (error) {
+      alert("Failed to delete user");
+    } finally {
+      setLoading(null);
+    }
+  };
+
+  const handleToggleAdmin = async (userId: string, currentAdmin: boolean) => {
+    setLoading(userId);
+    try {
+      await setUserAdmin(userId, !currentAdmin);
+      setUsers(
+        users.map((u) =>
+          u.id === userId ? { ...u, admin: !currentAdmin } : u
+        )
+      );
+    } catch (error) {
+      alert("Failed to update user");
+    } finally {
+      setLoading(null);
+    }
+  };
+
+  return (
+    <div>
+      <div className="mb-4">
+        <input
+          type="text"
+          placeholder="Search by email or name..."
+          value={search}
+          onChange={(e) => setSearch(e.target.value)}
+          className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
+        />
+      </div>
+      <div className="overflow-x-auto">
+        <table className="min-w-full bg-white border border-gray-200 rounded-lg">
+          <thead className="bg-gray-100 border-b">
+            <tr>
+              <th className="px-6 py-3 text-left text-sm font-semibold">Email</th>
+              <th className="px-6 py-3 text-left text-sm font-semibold">Admin</th>
+              <th className="px-6 py-3 text-left text-sm font-semibold">
+                Created
+              </th>
+              <th className="px-6 py-3 text-left text-sm font-semibold">Actions</th>
+            </tr>
+          </thead>
+          <tbody>
+            {filteredUsers.map((user) => (
+              <tr
+                key={user.id}
+                className="border-b hover:bg-gray-50 transition-colors"
+              >
+                <td className="px-6 py-4">{user.email}</td>
+                <td className="px-6 py-4">
+                  <span
+                    className={`px-2 py-1 rounded text-sm font-medium ${
+                      user.admin
+                        ? "bg-green-100 text-green-800"
+                        : "bg-gray-100 text-gray-800"
+                    }`}
+                  >
+                    {user.admin ? "Yes" : "No"}
+                  </span>
+                </td>
+                <td className="px-6 py-4 text-sm text-gray-600">
+                  {new Date(user.createdAt).toLocaleDateString()}
+                </td>
+                <td className="px-6 py-4 space-x-2">
+                  <button
+                    onClick={() => handleToggleAdmin(user.id, user.admin)}
+                    disabled={loading === user.id}
+                    className="px-3 py-1 text-sm bg-blue-500 text-white rounded hover:bg-blue-600 disabled:opacity-50"
+                  >
+                    {loading === user.id
+                      ? "..."
+                      : user.admin
+                        ? "Remove Admin"
+                        : "Make Admin"}
+                  </button>
+                  <button
+                    onClick={() => handleDeleteUser(user.id)}
+                    disabled={loading === user.id}
+                    className="px-3 py-1 text-sm bg-red-500 text-white rounded hover:bg-red-600 disabled:opacity-50"
+                  >
+                    {loading === user.id ? "..." : "Delete"}
+                  </button>
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+        {filteredUsers.length === 0 && (
+          <div className="text-center py-8 text-gray-500">
+            {search ? "No users found matching your search" : "No users found"}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

src/lib/auth.ts

@@ -1,20 +1,24 @@
-import { betterAuth } from "better-auth";
+import { betterAuth, Session } from "better-auth";
 import { localization } from "better-auth-localization";
 import { drizzleAdapter } from "@better-auth/drizzle-adapter";
+import { headers } from "next/headers";
 import db from "./db";
-import { user, session, account, verification } from "./model";
+import * as schema from "./model/auth-schema";
 
 
 export const auth = betterAuth({
     database: drizzleAdapter(db, {
       provider: "sqlite",
-      schema: {
-        user,
-        session,
-        account,
-        verification,
-      },
+      schema: schema
     }),
+    user:{
+      additionalFields: {
+        admin: {
+          type: "boolean",
+          default: false,
+        }
+      }
+    },
     emailAndPassword: {
         enabled: true,
     },
@@ -26,3 +30,15 @@ export const auth = betterAuth({
     })
   ]
 });
+
+export async function requireAdmin() {
+  const session = await auth.api.getSession({
+    headers: await headers()
+  });
+
+  if (!session) {
+    return { authenticated: false, admin: false };
+  }
+
+  return { authenticated: true, admin: session.user.admin, session };
+}

src/lib/model/auth-schema.ts

@@ -9,6 +9,7 @@ export const user = sqliteTable("user", {
     .default(false)
     .notNull(),
   image: text("image"),
+  admin: integer("admin", { mode: "boolean" }).default(false).notNull(),
   createdAt: integer("created_at", { mode: "timestamp_ms" })
     .default(sql`(cast(unixepoch('subsecond') * 1000 as integer))`)
     .notNull(),