Policy constructor
Policy(})
Implementation
Policy(this.key, this.bucket, this.datetime, this.expiration, this.credential,
this.maxFileSize,
{this.region = 'us-east-1'});
Policy(this.key, this.bucket, this.datetime, this.expiration, this.credential,
this.maxFileSize,
{this.region = 'us-east-1'});