74 lines
2.3 KiB
Python
Executable File
74 lines
2.3 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Local tile server for HK aerial map. Translates /tiles/{z}/{x}/{y}.jpg -> tiles/18_{x}_{y}.jpg"""
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import http.server
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import socketserver
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import os
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import re
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import webbrowser
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import threading
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from pathlib import Path
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PORT = 8080
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SCRIPT_DIR = Path(__file__).parent
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TRANSPARENT_GIF = (
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b'GIF89a\x01\x00\x01\x00\x80\x00\x00\xff\xff\xff\x00\x00\x00'
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b'!\xf9\x04\x00\x00\x00\x00\x00,\x00\x00\x00\x00\x01\x00\x01'
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b'\x00\x00\x02\x02D\x01\x00;'
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)
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TILE_PATTERN = re.compile(
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r'^/(tiles(?:_annotated)?)/(\d+)/(\d+)/(\d+)\.(jpg|png|gif)$'
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)
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class Handler(http.server.SimpleHTTPRequestHandler):
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def do_GET(self):
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path = self.path.split('?')[0]
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m = TILE_PATTERN.match(path)
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if m:
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layer, z, x, y, ext = m.groups()
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# Tiles are stored as 18_x_y.jpg regardless of requested zoom
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flat = SCRIPT_DIR / layer / f'18_{x}_{y}.jpg'
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if flat.exists():
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data = flat.read_bytes()
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self.send_response(200)
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self.send_header('Content-Type', 'image/jpeg')
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self.send_header('Content-Length', len(data))
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self.send_header('Cache-Control', 'public, max-age=3600')
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self.end_headers()
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self.wfile.write(data)
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else:
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self.send_response(200)
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self.send_header('Content-Type', 'image/gif')
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self.send_header('Content-Length', len(TRANSPARENT_GIF))
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self.end_headers()
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self.wfile.write(TRANSPARENT_GIF)
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return
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super().do_GET()
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def log_message(self, fmt, *args):
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# Only log non-tile requests so output stays readable
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if not TILE_PATTERN.match(self.path.split('?')[0]):
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print(f' {self.address_string()} {fmt % args}')
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def main():
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os.chdir(SCRIPT_DIR)
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with socketserver.TCPServer(('', PORT), Handler) as httpd:
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httpd.allow_reuse_address = True
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url = f'http://localhost:{PORT}/map.html'
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print(f'HK Aerial Map → {url}')
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print('Press Ctrl+C to stop.\n')
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threading.Timer(0.4, webbrowser.open, args=(url,)).start()
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try:
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httpd.serve_forever()
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except KeyboardInterrupt:
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print('\nServer stopped.')
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if __name__ == '__main__':
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main()
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