add initial

src/app/blog/login/action.ts

@@ -0,0 +1,27 @@
+"use server";
+
+import { PrismaClient } from "@prisma/client";
+import argon2 from "argon2";
+import { setSession } from "../write/auth";
+import { redirect, RedirectType } from "next/navigation";
+
+export async function handleLogin(data: FormData) {
+  const prisma = new PrismaClient();
+  const username = data.get("username")?.toString();
+  const password = data.get("password")?.toString();
+  if (!username || !password) {
+    throw new Error("Missing username or password");
+  }
+
+  const user = await prisma.user.findUnique({ where: { username } });
+  if (!user) {
+    redirect("/blog/login?error=Invalid%20credentials", RedirectType.replace);
+  }
+
+  if (await argon2.verify(user.password, password)) {
+    setSession();
+    redirect("/blog/write", RedirectType.replace);
+  } else {
+    redirect("/blog/login?error=Invalid%20credentials", RedirectType.replace);
+  }
+}