metadata_to_tilejson

scripts/http_host/metadata_to_tilejson.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+import json
+from pathlib import Path
+from pprint import pprint
+
+import click
+
+
+@click.command()
+@click.argument(
+    'metadata_path', type=click.Path(exists=True, dir_okay=False, file_okay=True, path_type=Path)
+)
+@click.argument('tilejson_path', type=click.Path(path_type=Path))
+@click.argument('url_prefix')
+@click.option('--minify', is_flag=True, help='Minify the generated JSON')
+def cli(metadata_path: Path, tilejson_path: Path, url_prefix: str, minify: bool):
+    """
+    Takes a MBTiles metadata.json and generates a TileJSON 3.0.0 file
+
+    URL_PREFIX: Base URL to use as a prefix for tiles in the generated TileJSON.
+
+    Reference: https://github.com/mapbox/tilejson-spec/tree/master/3.0.0
+    """
+
+    tilejson = dict(tilejson='3.0.0')
+
+    with open(metadata_path) as fp:
+        metadata = json.load(fp)
+
+    metadata_json_key = json.loads(metadata.pop('json'))
+
+    tilejson['tiles'] = [url_prefix.rstrip('/') + '/{z}/{x}/{y}.pbf']
+
+    ''
+    tilejson['vector_layers'] = metadata_json_key.pop('vector_layers')
+    assert not metadata_json_key  # check that no more keys left
+
+    tilejson['attribution'] = metadata.pop('attribution')
+    tilejson['bounds'] = [float(n) for n in metadata.pop('bounds').split(',')]
+    tilejson['center'] = [float(n) for n in metadata.pop('center').split(',')]
+    tilejson['center'][2] = 1
+
+    tilejson['description'] = metadata.pop('description')
+
+    tilejson['maxzoom'] = int(metadata.pop('maxzoom'))
+    tilejson['minzoom'] = int(metadata.pop('minzoom'))
+
+    tilejson['name'] = metadata.pop('name')
+    tilejson['version'] = metadata.pop('version')
+
+    with open(tilejson_path, 'w') as fp:
+        if minify:
+            json.dump(tilejson, fp, ensure_ascii=False, separators=(',', ':'))
+        else:
+            json.dump(tilejson, fp, ensure_ascii=False, indent=2)
+
+
+if __name__ == '__main__':
+    cli()