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[AI-9623] Implement SDK host-side soft-mint embed origin for Angie Applications #112

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[AI-9623] Implement SDK host-side soft-mint embed origin for Angie Applications #112

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286 changes: 286 additions & 0 deletions src/embed-token.test.ts
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import {
mintEmbedSession,
ensureEmbedToken,
clearEmbedTokenCache,
getEmbedApiBaseUrl,
MINT_SKEW_SECONDS,
} from './embed-token';

describe( 'embed-token', () => {
const mockAppId = 'NG-test-app-123';
const mockIframeOrigin = 'https://angie.elementor.com';
const mockEmbedToken = 'mock-embed-token-jwt';
const nowSeconds = Math.floor( Date.now() / 1000 );
const mockExp = nowSeconds + 300;

beforeEach( () => {
clearEmbedTokenCache();
jest.clearAllMocks();
global.fetch = jest.fn();
} );

afterEach( () => {
jest.restoreAllMocks();
} );

describe( 'getEmbedApiBaseUrl', () => {
it( 'should return the iframe origin as the base URL', () => {
expect( getEmbedApiBaseUrl( mockIframeOrigin ) ).toBe( mockIframeOrigin );
} );
} );

describe( 'mintEmbedSession', () => {
it( 'should successfully mint an embed session', async () => {
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: true,
json: async () => ( {
embedToken: mockEmbedToken,
exp: mockExp,
} ),
} );

const result = await mintEmbedSession( mockAppId, mockIframeOrigin );

expect( result ).toEqual( {
embedToken: mockEmbedToken,
exp: mockExp,
} );

expect( global.fetch ).toHaveBeenCalledWith(
`${ mockIframeOrigin }/angie/embed/session`,
{
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify( { appId: mockAppId } ),
credentials: 'include',
}
);
} );

it( 'should throw an error when the response is not ok', async () => {
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: false,
status: 403,
text: async () => 'Forbidden',
} );

await expect( mintEmbedSession( mockAppId, mockIframeOrigin ) )
.rejects.toThrow( 'Embed session mint failed with status 403: Forbidden' );
} );

it( 'should throw an error when the response is missing embedToken', async () => {
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: true,
json: async () => ( {
exp: mockExp,
} ),
} );

await expect( mintEmbedSession( mockAppId, mockIframeOrigin ) )
.rejects.toThrow( 'Invalid embed session response: missing embedToken or exp' );
} );

it( 'should throw an error when the response is missing exp', async () => {
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: true,
json: async () => ( {
embedToken: mockEmbedToken,
} ),
} );

await expect( mintEmbedSession( mockAppId, mockIframeOrigin ) )
.rejects.toThrow( 'Invalid embed session response: missing embedToken or exp' );
} );

it( 'should handle fetch network errors', async () => {
( global.fetch as jest.Mock ).mockRejectedValue( new Error( 'Network error' ) );

await expect( mintEmbedSession( mockAppId, mockIframeOrigin ) )
.rejects.toThrow( 'Embed session mint error: Network error' );
} );
} );

describe( 'ensureEmbedToken', () => {
it( 'should mint a new token when cache is empty', async () => {
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: true,
json: async () => ( {
embedToken: mockEmbedToken,
exp: mockExp,
} ),
} );

const result = await ensureEmbedToken( mockAppId, mockIframeOrigin );

expect( result ).toEqual( {
embedToken: mockEmbedToken,
exp: mockExp,
} );

expect( global.fetch ).toHaveBeenCalledTimes( 1 );
} );

it( 'should return cached token when it is still valid', async () => {
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: true,
json: async () => ( {
embedToken: mockEmbedToken,
exp: mockExp,
} ),
} );

const firstResult = await ensureEmbedToken( mockAppId, mockIframeOrigin );
const secondResult = await ensureEmbedToken( mockAppId, mockIframeOrigin );

expect( firstResult ).toEqual( secondResult );
expect( global.fetch ).toHaveBeenCalledTimes( 1 );
} );

it( 'should remint when cached token is expired', async () => {
const expiredExp = nowSeconds - 100;
const newExp = nowSeconds + 300;

let callCount = 0;
( global.fetch as jest.Mock ).mockImplementation( async () => {
callCount++;
return {
ok: true,
json: async () => ( {
embedToken: callCount === 1 ? 'old-token' : 'new-token',
exp: callCount === 1 ? expiredExp : newExp,
} ),
};
} );

const firstResult = await ensureEmbedToken( mockAppId, mockIframeOrigin );
expect( firstResult.embedToken ).toBe( 'old-token' );

const secondResult = await ensureEmbedToken( mockAppId, mockIframeOrigin );
expect( secondResult.embedToken ).toBe( 'new-token' );

expect( global.fetch ).toHaveBeenCalledTimes( 2 );
} );

it( 'should remint when cached token is within skew window', async () => {
const nearExpiryExp = nowSeconds + MINT_SKEW_SECONDS - 10;
const newExp = nowSeconds + 300;

let callCount = 0;
( global.fetch as jest.Mock ).mockImplementation( async () => {
callCount++;
return {
ok: true,
json: async () => ( {
embedToken: callCount === 1 ? 'near-expiry-token' : 'fresh-token',
exp: callCount === 1 ? nearExpiryExp : newExp,
} ),
};
} );

const firstResult = await ensureEmbedToken( mockAppId, mockIframeOrigin );
expect( firstResult.embedToken ).toBe( 'near-expiry-token' );

const secondResult = await ensureEmbedToken( mockAppId, mockIframeOrigin );
expect( secondResult.embedToken ).toBe( 'fresh-token' );

expect( global.fetch ).toHaveBeenCalledTimes( 2 );
} );

it( 'should coalesce concurrent mint requests', async () => {
( global.fetch as jest.Mock ).mockImplementation( async () => {
await new Promise( ( resolve ) => setTimeout( resolve, 50 ) );
return {
ok: true,
json: async () => ( {
embedToken: mockEmbedToken,
exp: mockExp,
} ),
};
} );

const [ result1, result2, result3 ] = await Promise.all( [
ensureEmbedToken( mockAppId, mockIframeOrigin ),
ensureEmbedToken( mockAppId, mockIframeOrigin ),
ensureEmbedToken( mockAppId, mockIframeOrigin ),
] );

expect( result1 ).toEqual( result2 );
expect( result2 ).toEqual( result3 );
expect( global.fetch ).toHaveBeenCalledTimes( 1 );
} );

it( 'should clear in-flight promise on error', async () => {
( global.fetch as jest.Mock )
.mockRejectedValueOnce( new Error( 'Network error' ) )
.mockResolvedValueOnce( {
ok: true,
json: async () => ( {
embedToken: mockEmbedToken,
exp: mockExp,
} ),
} );

await expect( ensureEmbedToken( mockAppId, mockIframeOrigin ) )
.rejects.toThrow( 'Network error' );

const result = await ensureEmbedToken( mockAppId, mockIframeOrigin );
expect( result.embedToken ).toBe( mockEmbedToken );
expect( global.fetch ).toHaveBeenCalledTimes( 2 );
} );
} );

describe( 'clearEmbedTokenCache', () => {
beforeEach( async () => {
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: true,
json: async () => ( {
embedToken: mockEmbedToken,
exp: mockExp,
} ),
} );

await ensureEmbedToken( mockAppId, mockIframeOrigin );
await ensureEmbedToken( 'NG-another-app', mockIframeOrigin );
} );

it( 'should clear cache for a specific appId', async () => {
clearEmbedTokenCache( mockAppId );

( global.fetch as jest.Mock ).mockClear();
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: true,
json: async () => ( {
embedToken: 'new-token',
exp: mockExp,
} ),
} );

await ensureEmbedToken( mockAppId, mockIframeOrigin );
expect( global.fetch ).toHaveBeenCalledTimes( 1 );

await ensureEmbedToken( 'NG-another-app', mockIframeOrigin );
expect( global.fetch ).toHaveBeenCalledTimes( 1 );
} );

it( 'should clear all caches when no appId is provided', async () => {
clearEmbedTokenCache();

( global.fetch as jest.Mock ).mockClear();
( global.fetch as jest.Mock ).mockResolvedValue( {
ok: true,
json: async () => ( {
embedToken: 'new-token',
exp: mockExp,
} ),
} );

await ensureEmbedToken( mockAppId, mockIframeOrigin );
expect( global.fetch ).toHaveBeenCalledTimes( 1 );

await ensureEmbedToken( 'NG-another-app', mockIframeOrigin );
expect( global.fetch ).toHaveBeenCalledTimes( 2 );
} );
} );
} );
109 changes: 109 additions & 0 deletions src/embed-token.ts
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import type { EmbedTokenPayload } from './types';

export interface EmbedSessionMintRequest {
appId: string;
}

export interface EmbedSessionMintResponse {
embedToken: string;
exp: number;
}

const MINT_SKEW_SECONDS = 60;

const tokenCache = new Map<string, EmbedTokenPayload>();
const mintPromises = new Map<string, Promise<EmbedTokenPayload>>();

export const getEmbedApiBaseUrl = ( iframeOrigin: string ): string => {
return iframeOrigin;
};

const isTokenValid = ( payload: EmbedTokenPayload | undefined ): boolean => {
if ( ! payload ) {
return false;
}
const nowSeconds = Math.floor( Date.now() / 1000 );
return payload.exp > nowSeconds + MINT_SKEW_SECONDS;
};

export const mintEmbedSession = async (
appId: string,
iframeOrigin: string,
): Promise<EmbedTokenPayload> => {
const baseUrl = getEmbedApiBaseUrl( iframeOrigin );
const endpoint = `${ baseUrl }/angie/embed/session`;

const body: EmbedSessionMintRequest = { appId };

try {
const response = await fetch( endpoint, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify( body ),
credentials: 'include',
} );

if ( ! response.ok ) {
const errorText = await response.text().catch( () => 'Unknown error' );
throw new Error( `Embed session mint failed with status ${ response.status }: ${ errorText }` );
}

const data: EmbedSessionMintResponse = await response.json();

if ( ! data.embedToken || ! data.exp ) {
throw new Error( 'Invalid embed session response: missing embedToken or exp' );
}

return {
embedToken: data.embedToken,
exp: data.exp,
};
} catch ( error ) {
throw new Error( `Embed session mint error: ${ error instanceof Error ? error.message : String( error ) }` );
}
};

export const ensureEmbedToken = async (
appId: string,
iframeOrigin: string,
): Promise<EmbedTokenPayload> => {
const cached = tokenCache.get( appId );

if ( cached && isTokenValid( cached ) ) {
return cached;
}

const existingMint = mintPromises.get( appId );
if ( existingMint ) {
return existingMint;
}

const mintPromise = mintEmbedSession( appId, iframeOrigin )
.then( ( payload ) => {
tokenCache.set( appId, payload );
mintPromises.delete( appId );
return payload;
} )
.catch( ( error ) => {
mintPromises.delete( appId );
tokenCache.delete( appId );
throw error;
} );

mintPromises.set( appId, mintPromise );
return mintPromise;
};

export const clearEmbedTokenCache = ( appId?: string ): void => {
if ( appId ) {
tokenCache.delete( appId );
mintPromises.delete( appId );
} else {
tokenCache.clear();
mintPromises.clear();
}
};

export { MINT_SKEW_SECONDS };
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