# https://github.dev/GeoNode/geonode/blob/99b0557da5c7db23c72ad39e466b88fe43edf82d/geonode/geoserver/views.py#L158-L159
@login_required
def dataset_style_upload(request, layername):
    def respond(*args, **kw):
        kw['content_type'] = 'text/html'
        return json_response(*args, **kw)
    ...
    sld = request.FILES['sld'].read() # 1
    sld_name = None
    try:
        # Check SLD is valid
        ...
        sld_name = extract_name_from_sld(gs_catalog, sld, sld_file=request.FILES['sld']) # 2
    except Exception as e:
        respond(errors=f"The uploaded SLD file is not valid XML: {e}")
    name = data.get('name') or sld_name
    set_dataset_style(layer, data.get('title') or name, sld)
    return respond(
        body={
            'success': True,
            'style': data.get('title') or name, # 3
            'updated': data['update']})

# https://github.dev/GeoNode/geonode/blob/99b0557da5c7db23c72ad39e466b88fe43edf82d/geonode/geoserver/helpers.py#L233-L234
def extract_name_from_sld(gs_catalog, sld, sld_file=None):
    try:
        if sld:
            if isfile(sld):
                with open(sld, "rb") as sld_file:
                    sld = sld_file.read() # 1
            if isinstance(sld, str):
                sld = sld.encode('utf-8')
            dom = etree.XML(sld) # 2
        ...
    named_dataset = dom.findall(
        "{http://www.opengis.net/sld}NamedLayer")
    el = None
    if named_dataset and len(named_dataset) > 0:
        user_style = named_dataset[0].findall("{http://www.opengis.net/sld}UserStyle")
        if user_style and len(user_style) > 0:
            el = user_style[0].findall("{http://www.opengis.net/sld}Name") # 3
    ...
    return el[0].text # 4