将next-auth替换为better-auth

src/lib/server/services/userService.ts

@@ -0,0 +1,28 @@
+import prisma from "@/lib/db";
+import { UserCreateInput } from "../../../../generated/prisma/models";
+
+export async function createUserIfNotExists(email: string, name?: string | null) {
+    const user = await prisma.user.upsert({
+        where: {
+            email: email,
+        },
+        update: {},
+        create: {
+            email: email,
+            name: name || "New User",
+        } as UserCreateInput,
+    });
+    return user;
+}
+
+export async function getUserIdByEmail(email: string) {
+    const user = await prisma.user.findUnique({
+        where: {
+            email: email,
+        },
+        select: {
+            id: true,
+        },
+    });
+    return user ? user.id : null;
+}