Adding queryables link to landing page (#587)

* Adding queryables link to landing page

* Adding info to changelog

* Fixing schemajson -> jsonschema

* use `extension_is_enabled`

---------

Co-authored-by: Pete Gadomski <[email protected]>
Co-authored-by: Vincent Sarago <[email protected]>

Author: 3 people

CHANGES.md

@@ -5,6 +5,7 @@
 ### Added
 
 * Add benchmark in CI ([#650](https://github.com/stac-utils/stac-fastapi/pull/650))
+* Add `/queryables` link to the landing page ([#587](https://github.com/stac-utils/stac-fastapi/pull/587))
 
 ### Changed
 

stac_fastapi/types/stac_fastapi/types/core.py

@@ -369,6 +369,18 @@ def landing_page(self, **kwargs) -> stac_types.LandingPage:
             extension_schemas=[],
         )
 
+        # Add Queryables link
+        if self.extension_is_enabled("FilterExtension"):
+            landing_page["links"].append(
+                {
+                    "rel": Relations.queryables.value,
+                    "type": MimeTypes.jsonschema,
+                    "title": "Queryables",
+                    "href": urljoin(base_url, "queryables"),
+                    "method": "GET",
+                }
+            )
+
         # Add Collections links
         collections = self.all_collections(request=kwargs["request"])
         for collection in collections["collections"]:
@@ -566,6 +578,20 @@ async def landing_page(self, **kwargs) -> stac_types.LandingPage:
             conformance_classes=self.conformance_classes(),
             extension_schemas=[],
         )
+
+        # Add Queryables link
+        if self.extension_is_enabled("FilterExtension"):
+            landing_page["links"].append(
+                {
+                    "rel": Relations.queryables.value,
+                    "type": MimeTypes.jsonschema,
+                    "title": "Queryables",
+                    "href": urljoin(base_url, "queryables"),
+                    "method": "GET",
+                }
+            )
+
+        # Add Collections links
         collections = await self.all_collections(request=kwargs["request"])
         for collection in collections["collections"]:
             landing_page["links"].append(