botbuilder/lib/teams/teamsSSOTokenExchangeMiddleware.d.ts

import { Middleware, Storage, TurnContext } from 'botbuilder-core';
/**
 * If the activity name is signin/tokenExchange, this middleware will attempt to
 * exchange the token, and deduplicate the incoming call, ensuring only one
 * exchange request is processed.
 *
 * If a user is signed into multiple Teams clients, the Bot could receive a
 * "signin/tokenExchange" from each client. Each token exchange request for a
 * specific user login will have an identical activity.value.id.
 *
 * Only one of these token exchange requests should be processed by the bot.
 * The others return [StatusCodes.PRECONDITION_FAILED](xref:botframework-schema:StatusCodes.PRECONDITION_FAILED).
 * For a distributed bot in production, this requires distributed storage
 * ensuring only one token exchange is processed. This middleware supports
 * CosmosDb storage found in botbuilder-azure, or MemoryStorage for local development.
 */
export declare class TeamsSSOTokenExchangeMiddleware implements Middleware {
    private readonly storage;
    private readonly oAuthConnectionName;
    /**
     * Initializes a new instance of the TeamsSSOTokenExchangeMiddleware class.
     *
     * @param storage The [Storage](xref:botbuilder-core.Storage) to use for deduplication
     * @param oAuthConnectionName The connection name to use for the single sign on token exchange
     */
    constructor(storage: Storage, oAuthConnectionName: string);
    /**
     * Called each time the bot receives a new request.
     *
     * @param context Context for current turn of conversation with the user.
     * @param next Function to call to continue execution to the next step in the middleware chain.
     */
    onTurn(context: TurnContext, next: () => Promise<void>): Promise<void>;
    private deduplicatedTokenExchangeId;
    private exchangedToken;
}
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