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Supabase Backend as a Service · 课时

管理用户会话与个人资料

学习如何在应用中安全地管理用户会话、获取用户元数据并更新用户个人资料。

管理用户会话与个人资料 是 CoddyKit 上的免费 Supabase Backend as a Service 课时。 这是第 3 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Supabase Backend as a Service 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Supabase Backend as a Service 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

User Sessions & Profiles Intro

Welcome! In this lesson, we'll dive into managing user sessions and updating user profiles securely with Supabase.

When a user logs in, Supabase creates a session. This session keeps track of who the user is and ensures they remain authenticated across requests.

A user's profile often includes details like their name, avatar, or preferences. Supabase helps you store and manage this data.

Accessing the Current Session

To interact with the currently logged-in user, you first need to access their session. Supabase stores session tokens securely, usually in local storage or cookies.

You can retrieve the active session using supabase.auth.getSession(). This call returns a Promise that resolves with the session data.

import { createClient } from '@supabase/supabase-js';

const supabaseUrl = 'YOUR_SUPABASE_URL';
const supabaseAnonKey = 'YOUR_SUPABASE_ANON_KEY';

const supabase = createClient(supabaseUrl, supabaseAnonKey);

async function getCurrentSession() {
  const { data: { session }, error } = await supabase.auth.getSession();

  if (error) {
    console.error('Error getting session:', error.message);
    return;
  }

  if (session) {
    console.log('Current session:', session);
    console.log('User ID:', session.user.id);
    console.log('User email:', session.user.email);
  } else {
    console.log('No active session.');
  }
}

getCurrentSession();

Exploring the User Object

The session object contains a user property, which holds important information about the authenticated user.

Key properties within the user object include:

  • id: A unique identifier for the user.
  • email: The user's email address.
  • created_at: When the user account was created.
  • user_metadata: A JSON object for custom profile data.

We often store things like a user's display name or avatar URL in user_metadata.

Accessing User Profile Data

The user_metadata field within the user object is where you can store custom profile information. This data is part of the authentication service, not your main database tables.

It's a flexible JSON object, allowing you to store various details directly tied to the user's authentication record.

import { createClient } from '@supabase/supabase-js';

const supabaseUrl = 'YOUR_SUPABASE_URL';
const supabaseAnonKey = 'YOUR_SUPABASE_ANON_KEY';

const supabase = createClient(supabaseUrl, supabaseAnonKey);

async function getUserProfile() {
  const { data: { user }, error } = await supabase.auth.getUser();

  if (error) {
    console.error('Error getting user:', error.message);
    return;
  }

  if (user) {
    console.log('User ID:', user.id);
    console.log('Email:', user.email);
    console.log('User Metadata:', user.user_metadata);

    // Access specific metadata
    const displayName = user.user_metadata?.display_name || 'Guest';
    console.log('Display Name:', displayName);
  } else {
    console.log('No user logged in.');
  }
}

getUserProfile();

Modifying User Profile Data

To update a user's profile information, specifically their user_metadata, you use the supabase.auth.updateUser() method.

You pass an object to this method, with a data property that contains the new user_metadata. Supabase will merge this new data with any existing metadata.

  • Security Note: Always ensure you have appropriate Row-Level Security (RLS) policies in your database if you store sensitive profile data there. For user_metadata, Supabase handles its security.

Live Update User Metadata

Let's update a user's display name and add an avatar URL to their user_metadata.

Remember, the data property is for fields like user_metadata. Other fields like email or password are updated differently.

import { createClient } from '@supabase/supabase-js';

const supabaseUrl = 'YOUR_SUPABASE_URL';
const supabaseAnonKey = 'YOUR_SUPABASE_ANON_KEY';

const supabase = createClient(supabaseUrl, supabaseAnonKey);

async function updateProfile() {
  // This assumes a user is already logged in
  const { data: { user }, error: getUserError } = await supabase.auth.getUser();

  if (getUserError || !user) {
    console.error('No user logged in or error getting user:', getUserError?.message);
    return;
  }

  const { data, error } = await supabase.auth.updateUser({
    data: {
      display_name: 'Coddy Learner',
      avatar_url: 'https://example.com/coddy_avatar.png'
    }
  });

  if (error) {
    console.error('Error updating user metadata:', error.message);
  } else {
    console.log('Profile updated successfully!', data.user.user_metadata);
  }
}

// In a real app, you'd call this after a user logs in
// or on a profile settings page.
// For this example, assume a user is logged in.
updateProfile();

Changing Email & Password

Besides user_metadata, users can also update their email address and password.

  • Updating Email: Requires a confirmation flow. The user receives an email with a link to confirm the new address.
  • Updating Password: Directly changes the password. For security, always prompt the user to re-authenticate or enter their current password before allowing a change.

These are also handled via supabase.auth.updateUser(), but you pass the email or password property directly, not within the data object.

Ending a User Session

When a user wants to log out, you need to terminate their active session. This securely removes their authentication tokens and prevents further access to protected resources.

The supabase.auth.signOut() method handles this process for you. It invalidates the session and clears any stored tokens.

After signing out, it's good practice to redirect the user to a public page (e.g., login screen) and clear any client-side application state related to the user.

Logging Out a User

This simple code snippet demonstrates how to sign out a user. After this, their session will be invalid.

import { createClient } from '@supabase/supabase-js';

const supabaseUrl = 'YOUR_SUPABASE_URL';
const supabaseAnonKey = 'YOUR_SUPABASE_ANON_KEY';

const supabase = createClient(supabaseUrl, supabaseAnonKey);

async function signOutUser() {
  const { error } = await supabase.auth.signOut();

  if (error) {
    console.error('Error signing out:', error.message);
  } else {
    console.log('User signed out successfully!');
    // You might redirect the user here
    // window.location.href = '/login';
  }
}

// Call this function when a user clicks a "Logout" button
signOutUser();

Security for Profile Management

When managing user profiles, security is paramount:

  • Row-Level Security (RLS): If you store profile data in separate database tables (e.g., a profiles table), always implement RLS to ensure users can only read/update their own data.
  • Client-side Validation: While important for user experience, never rely solely on client-side validation. Always validate data on the server (e.g., using Edge Functions or database constraints).
  • Sensitive Data: Avoid storing highly sensitive information directly in user_metadata. For truly sensitive data, consider encrypted storage or dedicated, strictly controlled database tables.

Profile Update Check

You want to update a user's display name and favorite color, which are stored in their custom profile data.

Which method and property should you use with the Supabase client library?

Session & Profile Recap

Great job! You've learned how to manage user sessions and profiles:

  • Accessed the current user's session and user object.
  • Retrieved and updated custom user_metadata using supabase.auth.updateUser({ data: {...} }).
  • Understood how to handle email/password updates.
  • Implemented user logout with supabase.auth.signOut().
  • Reviewed key security considerations for profile data.

Next, you might explore integrating social logins or advanced RLS for profile tables!

常见问题解答

「管理用户会话与个人资料」课时是免费的吗？

是的 — 「管理用户会话与个人资料」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Supabase Backend as a Service 课程的其余内容，请升级到 CoddyKit PRO。 Supabase Backend as a Service 课程共包含 4 节课。

「管理用户会话与个人资料」这节课中我会学到什么？

学习如何在应用中安全地管理用户会话、获取用户元数据并更新用户个人资料。 你通过在浏览器中直接运行的动手代码来练习 Supabase Backend as a Service，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Supabase Backend as a Service 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Supabase Backend as a Service 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 3 节课，共 4 节。

「管理用户会话与个人资料」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Supabase Backend as a Service 课中编写并运行代码吗？

能。每节 Supabase Backend as a Service 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

  1. 使用电子邮件和密码注册用户
  2. 社交登录（OAuth 提供商）
  3. 管理用户会话与个人资料
  4. 密码重置与魔法链接身份验证
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