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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def licenses(source=DEFAULT_LICENSE_FILE):
    '''Feed the licenses from a JSON file'''
    if source.startswith('http'):
        json_licenses = requests.get(source).json()
    else:
        with open(source) as fp:
            json_licenses = json.load(fp)

    if len(json_licenses):
        log.info('Dropping existing licenses')
        License.drop_collection()

    for json_license in json_licenses:
        flags = []
        for field, flag in FLAGS_MAP.items():
            if json_license.get(field, False):
                flags.append(flag)

        license = License.objects.create(
            id=json_license['id'],
            title=json_license['title'],
            url=json_license['url'] or None,
            maintainer=json_license['maintainer'] or None,
            flags=flags,
            active=json_license.get('active', False),
            alternate_urls=json_license.get('alternate_urls', []),
            alternate_titles=json_license.get('alternate_titles', []),
        )
        log.info('Added license "%s"', license.title)
    try:
        License.objects.get(id=DEFAULT_LICENSE['id'])
    except License.DoesNotExist:
        License.objects.create(**DEFAULT_LICENSE)
        log.info('Added license "%s"', DEFAULT_LICENSE['title'])
    success('Done')