def upload_file_to_s3(file_key, filename, key, do_gzip=False,
                    do_expires=False, verbosity=0):
    """Details about params:
    * file_key is the relative path from media, e.g. media/folder/file.png
    * filename is the full path to the file, e.g.
        /var/www/site/media/folder/file.png
    """
    headers = {}
    content_type = guess_mimetype(filename)
    file_obj = open(filename, 'rb')
    if content_type:
        headers['Content-Type'] = content_type
    file_size = os.fstat(file_obj.fileno()).st_size
    filedata = file_obj.read()
    if do_gzip:
        # Gzipping only if file is large enough (>1K is recommended)
        # and only if file is a common text type (not a binary file)
        if file_size > 1024 and content_type in GZIP_CONTENT_TYPES:
            filedata = compress_string(filedata)
            headers['Content-Encoding'] = 'gzip'
            gzip_file_size = len(filedata)
            if verbosity > 1:
                print ("\tgzipped: %dk to %dk" % \
                    (file_size / 1024, gzip_file_size / 1024))
            file_size = gzip_file_size
    headers['Content-Length'] = str(file_size)
    if do_expires:
        # HTTP/1.0
        headers['Expires'] = '%s GMT' % (email.Utils.formatdate(
            time.mktime((datetime.datetime.now() +
                datetime.timedelta(days=365 * 2)).timetuple())))
        # HTTP/1.1
        headers['Cache-Control'] = 'max-age %d' % (3600 * 24 * 365 * 2)

    try:
        key.name = file_key
        key.set_contents_from_string(filedata, headers, replace=True)
        key.set_acl('public-read')
    finally:
        file_obj.close()