Merge pull request #51 from stac-utils/useMosaicMetadata

Insert mosaic metadata `min/max zoom` and `bounds` in tilejson

CHANGES.md

@@ -1,5 +1,9 @@
 # Release Notes
 
+## Unreleased
+
+* Insert mosaic metadata `min/max zoom` and `bounds` in tilejson
+
 ## 0.1.0.a7 (2022-04-05) Pre-Release
 
 * add `feature()` method to `PGSTACBackend` mosaic backend

tests/test_mosaic.py

@@ -411,6 +411,12 @@ async def test_query_with_metadata(app):
         "maxzoom": 2,
     }
 
+    response = await app.get(f"/mosaic/{cql2_id}/tilejson.json?assets=cog")
+    assert response.status_code == 200
+    resp = response.json()
+    assert resp["minzoom"] == 1
+    assert resp["maxzoom"] == 2
+
 
 @patch("rio_tiler.io.cogeo.rasterio")
 @pytest.mark.asyncio

titiler/pgstac/factory.py

@@ -2,7 +2,7 @@
 
 import os
 from dataclasses import dataclass, field
-from typing import Callable, Dict, List, Optional, Tuple, Type, Union
+from typing import Any, Callable, Dict, List, Optional, Tuple, Type, Union
 from urllib.parse import urlencode
 
 import rasterio
@@ -32,6 +32,11 @@
 from starlette.responses import Response
 
 
+def _first_value(values: List[Any], default: Any = None):
+    """Return the first not None value."""
+    return next(filter(lambda x: x is not None, values), default)
+
+
 @dataclass
 class MosaicTilerFactory(BaseTilerFactory):
     """Custom MosaicTiler for PgSTAC Mosaic Backend."""
@@ -258,11 +263,17 @@ def tilejson(
             if qs:
                 tiles_url += f"?{urlencode(qs)}"
 
+            minzoom = _first_value([minzoom, search_info.metadata.minzoom], tms.minzoom)
+            maxzoom = _first_value([maxzoom, search_info.metadata.maxzoom], tms.maxzoom)
+            bounds = _first_value(
+                [search_info.input_search.get("bbox"), search_info.metadata.bounds],
+                tms.bbox,
+            )
             return {
-                "bounds": search_info.input_search.get("bbox", tms.bbox),
-                "minzoom": minzoom if minzoom is not None else tms.minzoom,
-                "maxzoom": maxzoom if maxzoom is not None else tms.maxzoom,
-                "name": search_info.id,
+                "bounds": bounds,
+                "minzoom": minzoom,
+                "maxzoom": maxzoom,
+                "name": search_info.metadata.name or search_info.id,
                 "tiles": [tiles_url],
             }