From 84156909ab0451c1e2011cfce664586a1216f6ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20P=C4=99dzich?= <contact@maciejpedzi.ch>
Date: Thu, 25 May 2023 20:59:33 +0200
Subject: [PATCH] Implement authentication module

---
 src/App.vue                   | 16 ++++++++++-
 src/components/ui/NavMenu.vue | 47 ++++++++++++++++++------------
 src/composables/useAuth.ts    | 54 +++++++++++++++++++++++++++++++++++
 src/guards/auth.ts            | 19 ++++++++++++
 src/router/index.ts           | 15 ++++++++++
 src/types.d.ts                |  7 +++++
 src/views/LogIn.vue           | 21 ++++++++++++++
 src/views/Vote.vue            |  3 ++
 8 files changed, 162 insertions(+), 20 deletions(-)
 create mode 100644 src/composables/useAuth.ts
 create mode 100644 src/guards/auth.ts
 create mode 100644 src/types.d.ts
 create mode 100644 src/views/LogIn.vue
 create mode 100644 src/views/Vote.vue

diff --git a/src/App.vue b/src/App.vue
index 528b09f..862baa4 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,12 +1,26 @@
 <script setup lang="ts">
+import { useAuth } from './composables/useAuth';
 import NavMenu from './components/ui/NavMenu.vue';
+
+const { userLoadingFinished } = useAuth();
 </script>
 
 <template>
   <v-app>
     <NavMenu />
     <v-main>
-      <RouterView />
+      <section
+        v-if="!userLoadingFinished"
+        class="w-100 h-100 pb-4 d-flex justify-center align-center"
+      >
+        <v-progress-circular
+          :size="100"
+          :width="7"
+          color="indigo"
+          indeterminate
+        ></v-progress-circular>
+      </section>
+      <RouterView v-show="userLoadingFinished" />
     </v-main>
   </v-app>
 </template>
diff --git a/src/components/ui/NavMenu.vue b/src/components/ui/NavMenu.vue
index f340fe4..fb486da 100644
--- a/src/components/ui/NavMenu.vue
+++ b/src/components/ui/NavMenu.vue
@@ -1,8 +1,19 @@
 <script lang="ts" setup>
 import { ref } from 'vue';
+import { useRouter } from 'vue-router';
+
+import { useAuth } from '@/composables/useAuth';
 import ThemeSwitch from './ThemeSwitch.vue';
 
+const { isLoggedIn, logOut } = useAuth();
+const router = useRouter();
+
 const showDrawer = ref(false);
+
+const logOutAndGoToLogIn = async () => {
+  await logOut();
+  await router.push('/log-in');
+};
 </script>
 
 <template>
@@ -16,25 +27,23 @@ const showDrawer = ref(false);
   </v-app-bar>
   <v-navigation-drawer v-model="showDrawer" temporary>
     <v-list density="compact" nav>
-      <v-list-item
-        title="Home"
-        prepend-icon="mdi-home"
-        link
-        to="/"
-      ></v-list-item>
-      <v-list-item
-        title="Vote"
-        prepend-icon="mdi-vote"
-        link
-        to="/vote"
-      ></v-list-item>
-      <v-list-item
-        title="Log in"
-        prepend-icon="mdi-login"
-        link
-        to="/log-in"
-      ></v-list-item>
-      <v-list-item title="Log out" prepend-icon="mdi-logout"></v-list-item>
+      <v-list-item title="Home" prepend-icon="mdi-home" link to="/" />
+      <template v-if="isLoggedIn">
+        <v-list-item title="Vote" prepend-icon="mdi-vote" link to="/vote" />
+        <v-list-item
+          title="Log out"
+          prepend-icon="mdi-logout"
+          @click="logOutAndGoToLogIn"
+        />
+      </template>
+      <template v-else>
+        <v-list-item
+          title="Log in"
+          prepend-icon="mdi-login"
+          link
+          to="/log-in"
+        />
+      </template>
     </v-list>
   </v-navigation-drawer>
 </template>
diff --git a/src/composables/useAuth.ts b/src/composables/useAuth.ts
new file mode 100644
index 0000000..63333c7
--- /dev/null
+++ b/src/composables/useAuth.ts
@@ -0,0 +1,54 @@
+import { ref, computed } from 'vue';
+import { Models } from 'appwrite';
+
+import { account } from '@/appwrite';
+
+const user = ref<Models.User<Models.Preferences> | null>(null);
+const userLoadingFinished = ref(false);
+const isLoggedIn = computed(() => !!user.value);
+
+export function useAuth() {
+  const logIn = (provider: 'github' | 'discord') => {
+    const redirectPath = localStorage.getItem('redirectPath') || '/';
+    const permissionScopes =
+      provider === 'github'
+        ? ['read:user', 'user:email']
+        : ['identify', 'email'];
+
+    account.createOAuth2Session(
+      provider,
+      `${location.origin}${redirectPath}`,
+      `${location.origin}/log-in#oauth-error`,
+      permissionScopes
+    );
+  };
+
+  const loadUser = async () => {
+    try {
+      if (userLoadingFinished.value) return;
+
+      const currentUser = await account.get();
+      user.value = currentUser;
+    } catch (error) {
+      // TODO: Add to globaL Vue error logger and implement snackbar message bus
+      console.error(error);
+      user.value = null;
+    } finally {
+      userLoadingFinished.value = true;
+    }
+  };
+
+  const logOut = async () => {
+    await account.deleteSession('current');
+    user.value = null;
+  };
+
+  return {
+    user,
+    userLoadingFinished,
+    isLoggedIn,
+    logIn,
+    loadUser,
+    logOut
+  };
+}
diff --git a/src/guards/auth.ts b/src/guards/auth.ts
new file mode 100644
index 0000000..2c5a1e6
--- /dev/null
+++ b/src/guards/auth.ts
@@ -0,0 +1,19 @@
+import { RouteLocationNormalized, NavigationGuardNext } from 'vue-router';
+import { useAuth } from '@/composables/useAuth';
+
+export async function authGuard(
+  to: RouteLocationNormalized,
+  from: RouteLocationNormalized,
+  next: NavigationGuardNext
+) {
+  const { isLoggedIn, loadUser } = useAuth();
+
+  await loadUser();
+
+  if (!to.meta.authRequired || isLoggedIn.value) {
+    return next();
+  } else {
+    localStorage.setItem('redirectPath', to.fullPath);
+    return next('/log-in');
+  }
+}
diff --git a/src/router/index.ts b/src/router/index.ts
index 699436a..2748595 100644
--- a/src/router/index.ts
+++ b/src/router/index.ts
@@ -1,4 +1,6 @@
 import { createRouter, createWebHistory } from 'vue-router';
+
+import { authGuard } from '@/guards/auth';
 import Home from '@/views/Home.vue';
 
 const routes = [
@@ -6,6 +8,17 @@ const routes = [
     path: '/',
     name: 'Home',
     component: Home
+  },
+  {
+    path: '/log-in',
+    name: 'LogIn',
+    component: () => import('../views/LogIn.vue')
+  },
+  {
+    path: '/vote',
+    name: 'Vote',
+    meta: { authRequired: true },
+    component: () => import('../views/Vote.vue')
   }
 ];
 
@@ -14,4 +27,6 @@ const router = createRouter({
   routes
 });
 
+router.beforeEach(authGuard);
+
 export default router;
diff --git a/src/types.d.ts b/src/types.d.ts
new file mode 100644
index 0000000..5a54ebf
--- /dev/null
+++ b/src/types.d.ts
@@ -0,0 +1,7 @@
+import 'vue-router';
+
+declare module 'vue-router' {
+  interface RouteMeta {
+    authRequired?: boolean;
+  }
+}
diff --git a/src/views/LogIn.vue b/src/views/LogIn.vue
new file mode 100644
index 0000000..6af4cec
--- /dev/null
+++ b/src/views/LogIn.vue
@@ -0,0 +1,21 @@
+<script lang="ts" setup>
+import { useAuth } from '@/composables/useAuth';
+
+const { logIn } = useAuth();
+</script>
+
+<template>
+  <section class="w-100 h-100 d-flex flex-column justify-center align-center">
+    <h1 class="text-h3 mb-3">Log in via:</h1>
+    <v-container>
+      <v-row align="center" justify="center">
+        <v-col cols="auto">
+          <v-btn size="large" @click="logIn('github')">GitHub</v-btn>
+        </v-col>
+        <v-col cols="auto">
+          <v-btn size="large" @click="logIn('discord')">Discord</v-btn>
+        </v-col>
+      </v-row>
+    </v-container>
+  </section>
+</template>
diff --git a/src/views/Vote.vue b/src/views/Vote.vue
new file mode 100644
index 0000000..b972ecf
--- /dev/null
+++ b/src/views/Vote.vue
@@ -0,0 +1,3 @@
+<template>
+  <h1>Vote</h1>
+</template>