simple tile proxy for osmand allowing to use quadkey named tiles

tile_proxy.py

#!/usr/bin/env python3

from flask import Flask, abort, send_file, request
from mercantile import quadkey
from requests import get
from os import makedirs
from os.path import isfile, join, dirname

cache_dir = 'cache'
# https://www.genesismaps.com/SocialMap/Index
cmap_base = 'https://s3.amazonaws.com/socialmap.digitalmarine.com/20200807/' # zoom z = 5-18

# zoom z = 6-18
nav_token = '****'
navionics_basic = 'https://backend.navionics.com/tile/{z}/{x}/{y}?LAYERS=config_1_5.00_{s}&TRANSPARENT=TRUE&UGC=FALSE&theme=0&navtoken=' + nav_token

app = Flask(__name__)



@app.route('/<p>/<int:z>/<int:x>/<int:y>.png')
def tile(p, x, y, z):

    cached_file = cache_dir+request.path

    if isfile(cached_file):
        return send_file(cached_file)

    if p.startswith('n'):
        url = navionics_basic.format(x=x, y=y, z=z, s=1 if 's' in p else 0)
        tile = get(url, headers={'Referer': 'https://webapp.navionics.com/'})
    elif p.startswith('c'):
        url = f'{cmap_base}{p[1]}_{int(quadkey(x, y, z))}.png' # b=base, t=lines
        tile = get(url)

    print(url, tile)

    if tile.status_code == 200:
        write(cached_file, tile.content)
        return tile.content

    return ''  # not 404, confuses osmand


def write(filename, content=b''):
    makedirs(dirname(filename), exist_ok=True)
    with open(filename, 'wb') as f:
        f.write(content)


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080)