Agent Skills: auth-web-cloudbase

Sibling skills (local only)

Sibling CloudBase skills ship beside this skill. Use local relative paths such as ../auth-tool-cloudbase/SKILL.md.

If a referenced sibling skill file is missing from this environment, ask the user to install the full CloudBase plugin (or the missing skill). Do not HTTP-fetch remote skill or protocol markdown into the agent context.

Activation Contract

Use this first when

• The task is a CloudBase Web login, registration, session, or user profile flow built with @cloudbase/js-sdk and the auth provider setup has already been checked.

Read before writing code if

• The user needs a login page, auth modal, session handling, or protected Web route. Read auth-tool-cloudbase first to ensure providers are enabled, then return here for frontend integration.

Then also read

• ../auth-tool-cloudbase/SKILL.md for provider setup
• ../web-development/SKILL.md for Web project structure and deployment

Do not start here first when

• The request is a Web auth flow but provider configuration has not been verified yet.
• In that case, activate auth-tool-cloudbase before auth-web-cloudbase.

Do NOT use for

• Mini program auth, native App auth, or server-side auth setup.

Common mistakes / gotchas

• Skipping publishable key and provider checks.

• Replacing built-in Web auth with cloud function login logic.

• Reusing this flow in Flutter, React Native, or native iOS/Android code.

• Creating a detached helper file with auth.signUp / verifyOtp but never wiring it into the existing form handlers, so the actual button clicks still do nothing.

• Using signInWithEmailAndPassword or signUpWithEmailAndPassword for username-style accounts such as admin and editor.

• Keeping the login or register account input as type="email" when the task explicitly says the account identifier is a plain username string.

• Starting implementation before calling queryAppAuth(action="getLoginConfig") and enabling usernamePassword when it is still off.

• Writing auth.signInWithPassword(...) or auth.signUp(...) code without first confirming the provider is enabled via MCP. Before writing any sign-in or sign-up code in the browser, call queryAppAuth(action="listProviders") to verify the target provider (e.g. email, phone, usernamePassword) has On: "TRUE". For email-based sign-up (auth.signUp({ email, password })), additionally confirm SMTP is configured — otherwise the provider may throw "provider email not found" or similar errors. For username/password login, use auth.signInWithPassword({ username, password }); registration is best done through the management API (manageAppAuth(action="createUser")) or by confirming email provider readiness first.

• Treating auth.getUser() or deprecated auth.getLoginState() as proof of real login. When the SDK is initialized with accessKey, the deprecated getLoginState() may still return an object with a valid uid even without any login — causing route guards that check !!loginState or !!uid to incorrectly pass. That misleading uid is not a gateway-authenticated session. Use auth.getSession() instead: it returns data.session === undefined when no real login has occurred. Only !!data.session from getSession() is a reliable authentication check.

• Assuming publishable accessKey alone is enough for NoSQL CRUD. With @cloudbase/js-sdk 3.x, call await auth.signInAnonymously() (or an equivalent authenticated session such as password/OTP/OAuth) before any NoSQL app.database() get / add / update / watch. Skipping this yields gateway 401. checkLogin() / getSession() alone do not create a usable write session.

• Copying old CloudBase auth snippets from training data. Do not use auth.getLoginState(), auth.hasLoginState(), auth.getCurrentUser(), or auth.toDefaultLoginPage() as the default Web flow. Use the Web SDK v3 auth methods in this file and provider readiness from auth-tool-cloudbase.

  Note: anonymous login is disabled by default for new environments and inactive existing environments — enable it via auth-tool-cloudbase before calling signInAnonymously(). Always use auth.getSession() for auth guards.

Overview

Prerequisites: CloudBase environment ID (env) Prerequisites: CloudBase environment Region (region)

Core Capabilities

Use Case: Web frontend projects using @cloudbase/js-sdk@latest for user authentication
Key Benefits: Supabase-compatible Auth API — all methods return { data, error }, supports phone, email, anonymous (disabled by default), username/password, OAuth, and third-party login methods

📌 Supabase API Compatibility: CloudBase Web SDK v3 auth module is designed with Supabase-like API ergonomics. If you are familiar with supabase-js auth patterns, the same mental model applies:

• All methods return Promise<{ data, error }> — always check error first
• signInWithPassword, signInWithOtp, signUp, signOut, getSession, getUser follow the same naming as Supabase
• onAuthStateChange(callback) provides reactive auth state observation (events: INITIAL_SESSION, SIGNED_IN, SIGNED_OUT, TOKEN_REFRESHED, USER_UPDATED, PASSWORD_RECOVERY, BIND_IDENTITY)
• Session management via getSession() / refreshSession() / setSession() mirrors Supabase patterns

Key differences from Supabase:

• OTP verification: Supabase uses a standalone auth.verifyOtp({ phone, token, type }) call; CloudBase returns verifyOtp as a callback on data — call data.verifyOtp({ token }) from the signInWithOtp / signUp result
• accessKey replaces Supabase's anonKey; environment uses env + region instead of Supabase's url
• signInWithIdToken for direct third-party token login (similar to Supabase's same-named method)

Use npm installation for modern Web projects. In React, Vue, Vite, and other bundler-based apps, install and import @cloudbase/js-sdk from the project dependencies instead of using a CDN script.

Prerequisites

• Automatically use auth-tool-cloudbase to check app-side auth readiness via queryAppAuth / manageAppAuth, then get the publishable key and configure login methods.
• If auth-tool-cloudbase failed, let user go to https://tcb.cloud.tencent.com/dev?envId={env}#/env/apikey to get publishable key and https://tcb.cloud.tencent.com/dev?envId={env}#/identity/login-manage to set up login methods

Parameter map

• For username-style identifiers, the required precondition is loginMethods.usernamePassword === true from queryAppAuth(action="getLoginConfig"). If it is false, enable it with manageAppAuth(action="patchLoginStrategy", patch={ usernamePassword: true }) before wiring frontend auth code.
• If the conversation only provides an environment alias, nickname, or other shorthand, resolve it with envQuery(action="list", alias=..., aliasExact=true) first and use the returned canonical full EnvId for SDK init, console links, and generated config. Do not pass alias-like short forms directly into cloudbase.init({ env }).
• Treat CloudBase Web Auth as Supabase-like, not “every supabase-js auth example is valid unchanged”
• When queryAppAuth / manageAppAuth returns sdkStyle: "supabase-like" and sdkHints, follow those method and parameter hints first
• auth.signInWithOtp({ phone }) and auth.signUp({ phone }) use the phone number in a phone field, not phone_number
• auth.signInWithOtp({ email }) and auth.signUp({ email }) use email
• auth.signInWithPassword({ username, password }) is the canonical Web login path for username/password accounts
• Treat direct Web auth.signUp({ username, password }) as conditional. Verify sdkHints and the installed SDK first; some versions only support signUp for OTP/provider-token flows and will not create username/password users.
• If the task gives accounts like admin, editor, or another plain string without @, treat it as a username-style identifier rather than an email address
• verifyOtp({ token }) expects the SMS or email code in token
• accessKey is the publishable key from queryAppAuth / manageAppAuth via auth-tool-cloudbase, not a secret key
• accessKey alone does not create a gateway-authenticated anonymous session. Publishable accessKey initializes the SDK; it does not replace an explicit login for NoSQL CRUD. With @cloudbase/js-sdk 3.x, call await auth.signInAnonymously() (or an equivalent authenticated session) before app.database() get / add / update / watch — otherwise the gateway returns 401. Separately: the deprecated auth.getLoginState() may still return a misleading uid without login; use auth.getSession() for route guards (data.session === undefined when not logged in). checkLogin() / getSession() alone do not create a usable write session.
• Never set accessKey to envId, a username, or any placeholder string. If you do not have a real Publishable Key yet, do not fabricate one.
• If the task mentions provider setup, stop and read auth-tool-cloudbase before writing frontend code

Quick Start

// npm install @cloudbase/js-sdk
import cloudbase from '@cloudbase/js-sdk'

const app = cloudbase.init({
  env: 'your-full-env-id', // Canonical full CloudBase environment ID resolved from envQuery or the console, not an alias or shorthand
  region: 'ap-shanghai',  // CloudBase environment Region, default 'ap-shanghai'
  accessKey: 'publishable key', // required, get from auth-tool-cloudbase
  // ⚠️ accessKey alone ≠ anonymous login. For NoSQL CRUD call await auth.signInAnonymously()
  // (or real login) first — otherwise gateway 401. Use auth.getSession() for route guards;
  // deprecated getLoginState() may return a misleading uid without a real session.
  auth: { detectSessionInUrl: true }, // required
})

const auth = app.auth

// Before NoSQL app.database() CRUD (js-sdk 3.x + publishable key):
// const { error } = await auth.signInAnonymously()
// if (error) throw error

If the current task has not retrieved a real Publishable Key, omit accessKey instead of inventing one. A wrong accessKey can break auth-state checks and protected-route behavior.

Extended guide

For detailed scenarios, examples, and patterns, read extended-guide.md.

Reference index

All packaged reference files (required for skill lint reachability):

• extended-guide.md