feedleware/feedleware/youtube/__init__.py

from flask import abort, Blueprint
from .youtube import APIClient, NoSuchChannel
from .feed import construct_rss


def create_blueprint(config):
    """Create a YouTube endpoint blueprint."""
    client = APIClient(config["key"])
    youtube = Blueprint("youtube", __name__)

    @youtube.route("/<string:channel_id>", methods=["GET", "HEAD"])
    def get(channel_id: str):
        try:
            return (
                construct_rss(client, channel_id),
                {"Content-Type": "application/rss+xml"},
            )
        except NoSuchChannel:
            abort(404)

    return youtube