feat: implement user authentication and authorization with NextAuth, including user schema, password hashing, and role-based access control.

src/features/auth/api/login-action.ts

@@ -0,0 +1,28 @@
+"use server";
+
+import { signIn } from "@/lib/auth";
+import { AuthError } from "next-auth";
+
+/**
+ * Server action to handle user login.
+ */
+export async function loginAction(prevState: string | undefined, formData: FormData) {
+    try {
+        await signIn("credentials", {
+            username: formData.get("username"),
+            password: formData.get("password"),
+            redirectTo: "/dashboard"
+        });
+    } catch (error) {
+        if (error instanceof AuthError) {
+            switch (error.type) {
+                case "CredentialsSignin":
+                    return "Utilisateur ou mot de passe incorrect.";
+                default:
+                    return "Une erreur technique est survenue.";
+            }
+        }
+        // Next.js redirect throws a special error that must be rethrown
+        throw error;
+    }
+}