@molecule/api-oauth-client

Auto-generated, AI-first package reference for the molecule.dev ecosystem. It is written to be read by coding agents as much as by people, and is generated from this package's source — edit src/index.ts JSDoc, not this file.

Provider-agnostic OAuth 2.0 client interface for molecule.dev.

Defines the OAuthClientProvider interface for consuming external OAuth 2.0 APIs — building authorization URLs, exchanging codes for tokens, refreshing tokens, making authenticated requests, and revoking access. Bond packages (generic OAuth2, etc.) implement this interface. Application code uses the convenience functions (getAuthorizationUrl, getToken, refreshToken, request, revokeToken) which delegate to the bonded provider.

Quick Start

import { setProvider, getAuthorizationUrl, getToken } from '@molecule/api-oauth-client'
import { provider as genericOAuth } from '@molecule/api-oauth-client-generic'

setProvider(genericOAuth)

const config = {
  id: 'github',
  clientId: 'abc123',
  clientSecret: 'secret',
  authorizationUrl: 'https://github.com/login/oauth/authorize',
  tokenUrl: 'https://github.com/login/oauth/access_token',
  redirectUri: 'https://myapp.com/callback',
  scopes: ['user', 'repo'],
}

const authUrl = getAuthorizationUrl(config, { state: 'csrf-token' })
const tokens = await getToken(config, 'authorization-code')

Type

core

Installation

npm install @molecule/api-oauth-client @molecule/api-bond @molecule/api-i18n

API

Interfaces

AuthorizationUrlOptions

Options for the authorization URL.

interface AuthorizationUrlOptions {
  /** A CSRF-prevention state value. */
  state?: string

  /** PKCE code challenge. */
  codeChallenge?: string

  /** PKCE code challenge method (`'S256'` or `'plain'`). */
  codeChallengeMethod?: 'S256' | 'plain'

  /** Additional query parameters to include. */
  additionalParams?: Record<string, string>
}

OAuthClientConfig

Configuration options for oauth-client providers.

interface OAuthClientConfig {
  /** Default timeout for HTTP requests in milliseconds. */
  timeout?: number

  /** Custom user-agent header for requests. */
  userAgent?: string
}

OAuthClientProvider

OAuth client provider interface.

All OAuth client providers must implement this interface. Bond packages provide concrete implementations that handle the OAuth 2.0 flow for consuming external APIs.

interface OAuthClientProvider {
  /**
   * Builds the authorization URL that the user should be redirected to.
   *
   * @param config - The OAuth provider configuration.
   * @param options - Optional authorization URL parameters.
   * @returns The fully-qualified authorization URL.
   */
  getAuthorizationUrl(config: OAuthConfig, options?: AuthorizationUrlOptions): string

  /**
   * Exchanges an authorization code for access/refresh tokens.
   *
   * @param config - The OAuth provider configuration.
   * @param code - The authorization code received from the provider.
   * @param options - Optional token exchange parameters.
   * @returns The token set.
   */
  getToken(config: OAuthConfig, code: string, options?: TokenExchangeOptions): Promise<OAuthTokens>

  /**
   * Refreshes an expired access token using a refresh token.
   *
   * @param config - The OAuth provider configuration.
   * @param refreshToken - The refresh token.
   * @returns A new token set.
   */
  refreshToken(config: OAuthConfig, refreshToken: string): Promise<OAuthTokens>

  /**
   * Makes an authenticated HTTP request to a resource server.
   *
   * @param tokens - The current token set.
   * @param url - The resource URL.
   * @param options - Optional request parameters.
   * @returns The parsed response body.
   */
  request(tokens: OAuthTokens, url: string, options?: RequestOptions): Promise<unknown>

  /**
   * Revokes an access or refresh token.
   *
   * @param config - The OAuth provider configuration.
   * @param token - The token to revoke.
   * @returns Resolves when the token is revoked.
   */
  revokeToken(config: OAuthConfig, token: string): Promise<void>
}

OAuthConfig

Configuration for an OAuth 2.0 provider (the external service).

interface OAuthConfig {
  /** Unique identifier for this provider configuration. */
  id: string

  /** OAuth 2.0 client ID. */
  clientId: string

  /** OAuth 2.0 client secret. */
  clientSecret: string

  /** Authorization endpoint URL. */
  authorizationUrl: string

  /** Token endpoint URL. */
  tokenUrl: string

  /** Token revocation endpoint URL, if supported. */
  revocationUrl?: string

  /** Redirect URI registered with the provider. */
  redirectUri: string

  /** Requested scopes. */
  scopes?: string[]

  /** Scope delimiter (defaults to `' '`). */
  scopeDelimiter?: string
}

OAuthTokens

OAuth 2.0 access and refresh tokens.

interface OAuthTokens {
  /** The access token. */
  accessToken: string

  /** The refresh token, if granted. */
  refreshToken?: string

  /** Token type (typically `'Bearer'`). */
  tokenType: string

  /** Access token lifetime in seconds, if provided. */
  expiresIn?: number

  /** Absolute expiration timestamp (ISO 8601). */
  expiresAt?: string

  /** Granted scopes (may differ from requested scopes). */
  scope?: string
}

RequestOptions

Options for making an authenticated request to a resource server.

interface RequestOptions {
  /** HTTP method. Defaults to `'GET'`. */
  method?: HttpMethod

  /** Request headers. */
  headers?: Record<string, string>

  /** Request body (for POST/PUT/PATCH). */
  body?: unknown

  /** Content type. Defaults to `'application/json'`. */
  contentType?: string
}

TokenExchangeOptions

Options for the token exchange.

interface TokenExchangeOptions {
  /** PKCE code verifier, required when a code challenge was used. */
  codeVerifier?: string

  /** Additional body parameters to include. */
  additionalParams?: Record<string, string>
}

Types

HttpMethod

HTTP method for authenticated requests.

type HttpMethod = 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE'

OAuthGrantType

Supported OAuth 2.0 grant types.

type OAuthGrantType = 'authorization_code' | 'client_credentials' | 'refresh_token'

OAuthResponseType

Supported OAuth 2.0 response types.

type OAuthResponseType = 'code' | 'token'

Functions

getAuthorizationUrl(config, options)

Builds the authorization URL that the user should be redirected to.

function getAuthorizationUrl(config: OAuthConfig, options?: AuthorizationUrlOptions): string

• config — The OAuth provider configuration.
• options — Optional authorization URL parameters.

Returns: The fully-qualified authorization URL.

getProvider()

Retrieves the bonded OAuth client provider, throwing if none is configured.

function getProvider(): OAuthClientProvider

Returns: The bonded OAuth client provider.

getToken(config, code, options)

Exchanges an authorization code for access/refresh tokens.

function getToken(
  config: OAuthConfig,
  code: string,
  options?: TokenExchangeOptions,
): Promise<OAuthTokens>

• config — The OAuth provider configuration.
• code — The authorization code received from the provider.
• options — Optional token exchange parameters.

Returns: The token set.

hasProvider()

Checks whether an OAuth client provider is currently bonded.

function hasProvider(): boolean

Returns: true if an OAuth client provider is bonded.

refreshToken(config, token)

Refreshes an expired access token using a refresh token.

function refreshToken(config: OAuthConfig, token: string): Promise<OAuthTokens>

• config — The OAuth provider configuration.
• token — The refresh token string.

Returns: A new token set.

request(tokens, url, options)

Makes an authenticated HTTP request to a resource server.

function request(tokens: OAuthTokens, url: string, options?: RequestOptions): Promise<unknown>

• tokens — The current token set.
• url — The resource URL.
• options — Optional request parameters.

Returns: The parsed response body.

revokeToken(config, token)

Revokes an access or refresh token.

function revokeToken(config: OAuthConfig, token: string): Promise<void>

• config — The OAuth provider configuration.
• token — The token to revoke.

Returns: Resolves when the token is revoked.

setProvider(provider)

Registers an OAuth client provider as the active singleton. Called by bond packages during application startup.

function setProvider(provider: OAuthClientProvider): void

• provider — The OAuth client provider implementation to bond.

Available Providers

Provider	Package
Oauth Client	@molecule/api-oauth-client-generic

Injection Notes

Requirements

Peer dependencies:

• @molecule/api-bond ^1.0.1
• @molecule/api-i18n ^1.0.1

Runtime Dependencies

• @molecule/api-bond
• @molecule/api-i18n

This package CONSUMES external OAuth APIs on a user's behalf (calendar, repo, CRM integrations). For "Log in with X" use @molecule/api-oauth + @molecule/api-resource-user's logInOAuth, which already implement the login flow's security checks — don't rebuild login on this client.

• The full OAuthConfig — especially clientSecret — is SERVER-SIDE only, built from env/secrets (never literals in code). The browser only ever receives the authorization URL and returns the code to your API, which performs the exchange.
• state and PKCE are optional parameters but NOT optional practice: send a per-session random state (and a codeChallenge, method 'S256') on getAuthorizationUrl, REJECT the callback unless the returned state matches the stored one, then pass the matching codeVerifier in getToken's options.
• Persist the returned OAuthTokens per user server-side (encrypted at rest). refreshToken is only present when the provider grants one (e.g. offline scopes); track expiresAt and refresh before use or on auth failure — access tokens are short-lived.
• request(tokens, url, opts) attaches the token for you but does NOT auto-refresh — it throws on a non-2xx response; refresh-and-retry on auth failure is the caller's loop.

E2E Tests

Integration checklist — drive the real UI (live preview, no mocks), adapt each item to this app's actual "connect account" screens/flows, and check every box off one by one. A box you can't check is an integration bug to fix — not a skip. The third-party CONSENT SCREEN cannot be driven in-sandbox, so verify the token lifecycle + API-call wiring you own (authorize → callback → getToken → token store → refreshToken → request), stubbing the provider bond or the token endpoint where the real grant would occur:

• Connecting a third-party account from the UI runs authorize→callback→getToken and STORES the returned OAuthTokens (accessToken + refreshToken) server-side keyed to the authenticated user; the connection then shows as "connected" in the UI.
• An authenticated call to the third-party API via request(tokens, url) using the STORED token succeeds and its result appears in the app (bond a stub/test provider if available, else assert request is invoked with the stored accessToken — never a hardcoded or browser-supplied one).
• Token REFRESH works: an expired accessToken (force/simulate expiry via expiresAt) is transparently refreshed with refreshToken and the call is RETRIED — confirm exactly ONE refresh + a stored-token update, not an auth error surfaced to the user (request does not auto-refresh; the caller's refresh-and-retry loop must).
• Disconnecting revokes/removes the stored tokens (revokeToken + delete from the store) and the connection no longer works — a subsequent API call fails until the account is reconnected.
• SECURITY: accessToken/refreshToken + clientSecret live server-side only (encrypted at rest ideally) and are NEVER sent to the browser — the client only ever receives the authorization URL and returns the code.
• Tokens are scoped per user: user A's stored connection cannot be used to act as user B (the store is keyed by user id; handlers load only the caller's own tokens).
• The callback verifies state (CSRF): a per-session random state sent on getAuthorizationUrl must match on the callback, and a missing or mismatched state is rejected BEFORE any token exchange.