import type { MetadataBearer as __MetadataBearer } from "@smithy/types";
import type { StartAttachmentUploadRequest, StartAttachmentUploadResponse } from "../models/models_0";
/**
 * @public
 */
export type { __MetadataBearer };
/**
 * @public
 *
 * The input for {@link StartAttachmentUploadCommand}.
 */
export interface StartAttachmentUploadCommandInput extends StartAttachmentUploadRequest {
}
/**
 * @public
 *
 * The output of {@link StartAttachmentUploadCommand}.
 */
export interface StartAttachmentUploadCommandOutput extends StartAttachmentUploadResponse, __MetadataBearer {
}
declare const StartAttachmentUploadCommand_base: {
    new (input: StartAttachmentUploadCommandInput): import("@smithy/core/client").CommandImpl<StartAttachmentUploadCommandInput, StartAttachmentUploadCommandOutput, import("..").ConnectParticipantClientResolvedConfig, import("..").ServiceInputTypes, import("..").ServiceOutputTypes>;
    new (input: StartAttachmentUploadCommandInput): import("@smithy/core/client").CommandImpl<StartAttachmentUploadCommandInput, StartAttachmentUploadCommandOutput, import("..").ConnectParticipantClientResolvedConfig, import("..").ServiceInputTypes, import("..").ServiceOutputTypes>;
    getEndpointParameterInstructions(): import("@smithy/types").EndpointParameterInstructions;
};
/**
 * <p>Provides a pre-signed Amazon S3 URL in response for uploading the file directly to
 *             S3.</p>
 *          <p>For security recommendations, see <a href="https://docs.aws.amazon.com/connect/latest/adminguide/security-best-practices.html#bp-security-chat">Connect Customer Chat security best practices</a>. </p>
 *          <note>
 *             <p>
 *                <code>ConnectionToken</code> is used for invoking this API instead of
 *                     <code>ParticipantToken</code>.</p>
 *          </note>
 *          <p>The Amazon Connect Participant Service APIs do not use <a href="https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html">Signature Version 4
 *                     authentication</a>.</p>
 * @example
 * Use a bare-bones client and the command you need to make an API call.
 * ```javascript
 * import { ConnectParticipantClient, StartAttachmentUploadCommand } from "@aws-sdk/client-connectparticipant"; // ES Modules import
 * // const { ConnectParticipantClient, StartAttachmentUploadCommand } = require("@aws-sdk/client-connectparticipant"); // CommonJS import
 * // import type { ConnectParticipantClientConfig } from "@aws-sdk/client-connectparticipant";
 * const config = {}; // type is ConnectParticipantClientConfig
 * const client = new ConnectParticipantClient(config);
 * const input = { // StartAttachmentUploadRequest
 *   ContentType: "STRING_VALUE", // required
 *   AttachmentSizeInBytes: Number("long"), // required
 *   AttachmentName: "STRING_VALUE", // required
 *   ClientToken: "STRING_VALUE", // required
 *   ConnectionToken: "STRING_VALUE", // required
 * };
 * const command = new StartAttachmentUploadCommand(input);
 * const response = await client.send(command);
 * // { // StartAttachmentUploadResponse
 * //   AttachmentId: "STRING_VALUE",
 * //   UploadMetadata: { // UploadMetadata
 * //     Url: "STRING_VALUE",
 * //     UrlExpiry: "STRING_VALUE",
 * //     HeadersToInclude: { // UploadMetadataSignedHeaders
 * //       "<keys>": "STRING_VALUE",
 * //     },
 * //   },
 * // };
 *
 * ```
 *
 * @param StartAttachmentUploadCommandInput - {@link StartAttachmentUploadCommandInput}
 * @returns {@link StartAttachmentUploadCommandOutput}
 * @see {@link StartAttachmentUploadCommandInput} for command's `input` shape.
 * @see {@link StartAttachmentUploadCommandOutput} for command's `response` shape.
 * @see {@link ConnectParticipantClientResolvedConfig | config} for ConnectParticipantClient's `config` shape.
 *
 * @throws {@link AccessDeniedException} (client fault)
 *  <p>You do not have sufficient access to perform this action.</p>
 *
 * @throws {@link InternalServerException} (server fault)
 *  <p>This exception occurs when there is an internal failure in the Amazon Connect service.</p>
 *
 * @throws {@link ServiceQuotaExceededException} (client fault)
 *  <p>The number of attachments per contact exceeds the quota.</p>
 *
 * @throws {@link ThrottlingException} (client fault)
 *  <p>The request was denied due to request throttling.</p>
 *
 * @throws {@link ValidationException} (client fault)
 *  <p>The input fails to satisfy the constraints specified by Amazon Connect.</p>
 *
 * @throws {@link ConnectParticipantServiceException}
 * <p>Base exception class for all service exceptions from ConnectParticipant service.</p>
 *
 *
 * @public
 */
export declare class StartAttachmentUploadCommand extends StartAttachmentUploadCommand_base {
    /** @internal type navigation helper, not in runtime. */
    protected static __types: {
        api: {
            input: StartAttachmentUploadRequest;
            output: StartAttachmentUploadResponse;
        };
        sdk: {
            input: StartAttachmentUploadCommandInput;
            output: StartAttachmentUploadCommandOutput;
        };
    };
}