What is the canonical way to get lead image

Plone Support Add-on Development
6

I ended up with the following code:

def lead_image(self):
    """Return lead image information, if present. We try to guess
    the information based on field names as it's useless to try
    to deal with the ILeadImage interface.
    :returns: lead image information
    :rtype: dict or None
    """
    image = getattr(self.context, 'image', None)
    if image is None:
        return None  # no "image" field

    if not isinstance(image, NamedBlobImage):
        return None  # not a real image

    url = '{0}/@@download/image/{1}'.format(
        self.context.absolute_url(), image.filename)
    caption = getattr(self.context, 'image_caption', None)
    width, height = image.getImageSize()
    return dict(url=url, caption=caption, width=width, height=height)