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AtAuth
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211/** * OAuth flow utilities for AT Protocol authentication */
import type { AtAuthConfig, OAuthState, OAuthCallbackResult } from './types';import { decodeToken } from './token';import { storeToken, storeOAuthState, getOAuthState, generateNonce } from './storage';
/** * Default configuration */const DEFAULT_CONFIG: Partial<AtAuthConfig> = { storageKey: 'atauth_token', persistSession: true, refreshThreshold: 300,};
/** * Build the OAuth authorization URL. * * @param config - Auth configuration * @param state - Optional state to pass through OAuth flow * @returns Authorization URL to redirect to */export function buildAuthUrl( config: AtAuthConfig, state?: OAuthState): string { const { gatewayUrl, appId, callbackUrl } = config;
// Generate CSRF nonce const nonce = generateNonce();
// Build state object const oauthState: OAuthState = { ...state, nonce, };
// Store state for verification storeOAuthState(oauthState);
// Build URL const url = new URL(`${gatewayUrl}/oauth/authorize`); url.searchParams.set('state', JSON.stringify(oauthState));
if (appId) { url.searchParams.set('app_id', appId); }
if (callbackUrl) { url.searchParams.set('redirect_uri', callbackUrl); }
return url.toString();}
/** * Redirect to OAuth authorization. * * @param config - Auth configuration * @param state - Optional state to pass through OAuth flow */export function redirectToAuth( config: AtAuthConfig, state?: OAuthState): void { const url = buildAuthUrl(config, state);
if (typeof window !== 'undefined') { window.location.href = url; }}
/** * Handle OAuth callback. * * Call this function on your callback page to process the authentication result. * * @param config - Auth configuration * @returns Callback result with token or error */export function handleCallback( config: AtAuthConfig): OAuthCallbackResult { const fullConfig = { ...DEFAULT_CONFIG, ...config };
if (typeof window === 'undefined') { return { success: false, error: 'OAuth callback must be handled in browser', }; }
const url = new URL(window.location.href); const token = url.searchParams.get('token'); const error = url.searchParams.get('error'); const stateParam = url.searchParams.get('state');
// Handle error from gateway if (error) { return { success: false, error: decodeURIComponent(error), }; }
// Must have token if (!token) { return { success: false, error: 'No token received from auth gateway', }; }
// Verify state/CSRF const storedState = getOAuthState(); let returnTo: string | undefined;
if (stateParam) { try { const receivedState = JSON.parse(stateParam) as OAuthState;
// Verify nonce matches if (storedState?.nonce && receivedState.nonce !== storedState.nonce) { return { success: false, error: 'Invalid OAuth state (CSRF protection)', }; }
returnTo = receivedState.returnTo; } catch { // State parse error - might be okay if state wasn't used } }
// Decode token const user = decodeToken(token); if (!user) { return { success: false, error: 'Failed to decode authentication token', }; }
// Store token storeToken( token, fullConfig.storageKey, fullConfig.persistSession );
// Clean up URL cleanCallbackUrl();
return { success: true, token, user, returnTo, };}
/** * Remove OAuth parameters from URL without refresh. */function cleanCallbackUrl(): void { if (typeof window === 'undefined') return;
const url = new URL(window.location.href); url.searchParams.delete('token'); url.searchParams.delete('error'); url.searchParams.delete('state');
// Update URL without reload window.history.replaceState({}, document.title, url.pathname + url.search);}
/** * Check if current page is an OAuth callback. * * @returns True if URL contains OAuth callback parameters */export function isOAuthCallback(): boolean { if (typeof window === 'undefined') return false;
const url = new URL(window.location.href); return url.searchParams.has('token') || url.searchParams.has('error');}
/** * Build logout URL. * * @param config - Auth configuration * @param returnTo - URL to return to after logout * @returns Logout URL */export function buildLogoutUrl( config: AtAuthConfig, returnTo?: string): string { const url = new URL(`${config.gatewayUrl}/oauth/logout`);
if (returnTo) { url.searchParams.set('redirect_uri', returnTo); }
return url.toString();}