add deprecation warning for the ContextExtension (#658)

Author: vincentsarago

CHANGES.md

@@ -7,6 +7,7 @@
 * 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))
 - `id`, `title`, `description` and `api_version` fields can be customized via env variables
+* Add `DeprecationWarning` for the `ContextExtension`
 
 ### Changed
 

docs/src/tips-and-tricks.md

@@ -22,6 +22,10 @@ If needed, you can edit the `allow_origins` parameter to only allow CORS request
 
 ## Enable the Context extension
 
+!!! Warning
+
+    The `ContextExtension` is deprecated and will be removed in 3.0. See https://github.com/radiantearth/stac-api-spec/issues/396
+
 The Context STAC extension provides information on the number of items matched and returned from a STAC search.
 This is required by various other STAC-related tools, such as the pystac command-line client.
 To enable the extension, edit your backend's `app.py` and add the following import:
@@ -30,6 +34,7 @@ To enable the extension, edit your backend's `app.py` and add the following impo
 from stac_fastapi.extensions.core.context import ContextExtension
 ```
 
+
 and then edit the `api = StacApi(...` call to add `ContextExtension()` to the list given as the `extensions` parameter.
 
 ## Set API title, description and version

stac_fastapi/extensions/stac_fastapi/extensions/core/context.py

@@ -1,4 +1,6 @@
 """Context extension."""
+
+import warnings
 from typing import List, Optional
 
 import attr
@@ -24,6 +26,14 @@ class ContextExtension(ApiExtension):
         default="https://raw.githubusercontent.com/stac-api-extensions/context/v1.0.0-rc.2/json-schema/schema.json"
     )
 
+    def __attrs_post_init__(self):
+        """init."""
+        warnings.warm(
+            "The ContextExtension is deprecated and will be removed in 3.0.",
+            DeprecationWarning,
+            stacklevel=1,
+        )
+
     def register(self, app: FastAPI) -> None:
         """Register the extension with a FastAPI application.