/**
 * This are keys for the various APIs. In some scenarios, a token request to an authentication endpoint requires
 * a specific audience that depends on the API that is being called. For example, the `ZEEBE` audience is used for
 * the Zeebe API, while the `OPTIMIZE` audience is used for the Optimize API.
 *
 * Any implementation of IHeadersProvider will be called with one of these keys for an authorization header,
 * depending on which API client is requesting the header.
 *
 * See the `OAuthProvider` implementation for an example of how this is used.
 *
 * In cases where the audience is not required (such as cookie or basic authentication), it can be ignored.
 */
export type TokenGrantAudienceType = 'OPERATE' | 'ZEEBE' | 'OPTIMIZE' | 'TASKLIST' | 'CONSOLE' | 'MODELER';
/**
 * These are the default auth headers that are used by the {@link IHeadersProvider} implementations in the SDK.
 * You can use these headers to set the authentication headers for your API requests.
 * You can also extend this type to add any other headers that are required by your API endpoints.
 */
export type AuthHeader = {
    [K in 'authorization' | 'cookie']?: string;
};
export type HeadersPromise = Promise<AuthHeader>;
/**
 * An object that provides this interface is responsible for providing
 * authentication headers to the SDK. The SDK will use the provided
 * header(s) on requests to the Camunda 8 API endpoints.
 *
 * This interface is used by the SDK to support different authentication
 * mechanisms, such as OAuth2, Basic Auth, and others. The SDK will
 * call the `getToken` method to retrieve the authentication headers
 * for a specific audience. The audience is a string that identifies
 * the API endpoint that the SDK is trying to access.
 *
 * You can implement this interface to create a custom authentication
 * provider that meets your specific needs. You could also use this
 * interface to add any other headers that are required by your API endpoints.
 */
export interface IHeadersProvider<T extends {
    [key: string]: string;
} = AuthHeader> {
    /**
     * Called by the SDK to get the authentication headers for a specific audience.
     * The audience is a string that identifies the API endpoint that the SDK
     * is trying to access. The SDK will use the provided headers on requests
     * to the Camunda 8 API endpoint.
     * @param audience - The audience for which to get the authentication headers.
     * @returns A promise that resolves to an object containing the authentication headers.
     */
    getHeaders(audience: TokenGrantAudienceType): Promise<T>;
    /**
     * This is an optional method that can be implemented by the provider to
     * set the token for a specific audience. This method is useful for scenarios
     * where the token needs to be set manually, such as when using a static
     * bearer token or when managing the token lifecycle yourself.
     *
     * The SDK will not call this method automatically. It is up to the
     * implementation or the consumer to call this method when the token needs to be set.
     * @param audience
     * @param token
     */
    setToken?(audience: TokenGrantAudienceType, token: string): Promise<void>;
}