GF-6, #8 Added auth.

app/stores/auth.ts

@@ -0,0 +1,45 @@
+import { defineStore } from "pinia";
+import { ref, computed } from "vue";
+import { createAuthClient } from "better-auth/vue";
+
+const authClient = createAuthClient();
+
+export const useAuthStore = defineStore("useAuthStore", () => {
+  const session = ref<Awaited<ReturnType<typeof authClient.useSession>> | null>(null);
+  const lastError = ref<string | undefined>(undefined);
+
+  async function init() {
+    const data = await authClient.useSession(useFetch);
+    session.value = data;
+    lastError.value = undefined;
+  }
+
+  const user = computed(() => session.value?.data?.user);
+  const loading = computed(() => session.value?.isPending);
+
+  async function signIn(email: string, password: string) {
+    const { error } = await authClient.signIn.email({
+      email,
+      password,
+      callbackURL: "/",
+    });
+
+    if (error) {
+      lastError.value = error.message;
+    }
+  }
+
+  async function signOut() {
+    await authClient.signOut({});
+    navigateTo("/");
+  }
+
+  return {
+    init,
+    lastError,
+    loading,
+    signIn,
+    signOut,
+    user,
+  };
+});