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import { type Credentials, DefaultCredentialsProvider, getDefaultRegion } from "../client/credentials.ts";import { AWSSignerV4 } from "../client/signing.ts";
export interface GetSignedUrlOptions {  bucket: string;  path: string;  useDualstack?: boolean;  credentials?: Credentials;  method?: 'GET' | 'PUT';  region?: string;  expiresIn?: number;  date?: Date;}
/** * Presigns an AWS S3 URL for one of the commercial AWS regions. */export async function getPresignedUrl(options: GetSignedUrlOptions): Promise<string> {  const credentials = options.credentials ?? await DefaultCredentialsProvider.getCredentials();  const region = options.region ?? credentials.region ?? getDefaultRegion();
  const endpointHost = `s3.${(options.useDualstack ?? true) ? `dualstack.` : ''}${region}.amazonaws.com`;  const path = options.path.replace(/^\//, '');  const url = options.bucket.includes('.')    ? `https://${endpointHost}/${options.bucket}/${path}`    : `https://${options.bucket}.${endpointHost}/${path}`;
  const signer = new AWSSignerV4(region, credentials);  return await signer.presign('s3', {    url,    expiresIn: options.expiresIn,    method: options.method,    signTime: options.date,  });}