@aws-sdk/middleware-sdk-s3/dist-es/s3-express/functions/signS3Express.js

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export const signS3Express = async (s3ExpressIdentity, signingOptions, request, sigV4MultiRegionSigner) => {
    const signedRequest = await sigV4MultiRegionSigner.signWithCredentials(request, s3ExpressIdentity, {});
    if (signedRequest.headers["X-Amz-Security-Token"] || signedRequest.headers["x-amz-security-token"]) {
        throw new Error("X-Amz-Security-Token must not be set for s3-express requests.");
    }
    return signedRequest;
};