lemoncurry/wellknowns/favicons.py

from itertools import chain
from django.core.files.storage import default_storage


class Favicon:
    def __init__(self, size, rel="icon", mime="image/png"):
        self.rel = rel
        self.mime = mime
        if not isinstance(size, tuple):
            size = (size, size)
        self.size = size

    @property
    def url(self):
        return default_storage.url("favicon/" + self.filename)

    @property
    def filename(self):
        return "favicon-{0}.png".format(*self.size)

    @property
    def sizes(self):
        return "x".join(str(s) for s in self.size)


tile_sizes = {"small": 128, "medium": 270, "wide": (558, 270), "large": 558}


class Tile(Favicon):
    def __init__(self, size_name):
        super().__init__(tile_sizes[size_name])
        self.size_name = size_name

    @property
    def filename(self):
        return "{0}tile.png".format(self.size_name)


sizes = (32, 57, 76, 96, 120, 128, 144, 180, 195, 228)
icons = tuple(
    chain(
        (Favicon(s) for s in sizes),
        (Tile(s) for s in tile_sizes.keys()),
        (
            Favicon(152, rel="apple-touch-icon-precomposed"),
            Favicon(196, rel="shortcut icon"),
        ),
    )
)