Configure the landing page id, description, etc. via env vars (#639)

* Allow an easy way to configure the landing page id, description, title and version via env variables

* use pydantic settings (#657)

* use pydantic settings

* rename stac_fastapi_id to stac_fastapi_landing_id

* Update docs/src/tips-and-tricks.md

---------

Co-authored-by: vincentsarago <[email protected]>

Author: m-mohr

CHANGES.md

@@ -6,6 +6,7 @@
 
 * 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
 
 ### Changed
 

docs/src/tips-and-tricks.md

@@ -31,3 +31,12 @@ 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
+
+For the landing page, you can set the API title, description and version using environment variables.
+
+- `STAC_FASTAPI_VERSION` (string) is the version number of your API instance (this is not the STAC version).
+- `STAC FASTAPI_TITLE` (string) should be a self-explanatory title for your API.
+- `STAC FASTAPI_DESCRIPTION` (string) should be a good description for your API. It can contain CommonMark.
+- `STAC_FASTAPI_LANDING_ID` (string) is a unique identifier for your Landing page.

stac_fastapi/api/stac_fastapi/api/app.py

@@ -1,4 +1,5 @@
 """Fastapi app creation."""
+
 from typing import Any, Dict, List, Optional, Tuple, Type, Union
 
 import attr
@@ -83,10 +84,22 @@ class StacApi:
         converter=update_openapi,
     )
     router: APIRouter = attr.ib(default=attr.Factory(APIRouter))
-    title: str = attr.ib(default="stac-fastapi")
-    api_version: str = attr.ib(default="0.1")
+    title: str = attr.ib(
+        default=attr.Factory(
+            lambda self: self.settings.stac_fastapi_title, takes_self=True
+        )
+    )
+    api_version: str = attr.ib(
+        default=attr.Factory(
+            lambda self: self.settings.stac_fastapi_version, takes_self=True
+        )
+    )
     stac_version: str = attr.ib(default=STAC_VERSION)
-    description: str = attr.ib(default="stac-fastapi")
+    description: str = attr.ib(
+        default=attr.Factory(
+            lambda self: self.settings.stac_fastapi_description, takes_self=True
+        )
+    )
     search_get_request_model: Type[BaseSearchGetRequest] = attr.ib(
         default=BaseSearchGetRequest
     )

stac_fastapi/types/stac_fastapi/types/config.py

@@ -22,6 +22,11 @@ class ApiSettings(BaseSettings):
     # `pydantic.BaseSettings` instead
     default_includes: Optional[Set[str]] = None
 
+    stac_fastapi_title: str = "stac-fastapi"
+    stac_fastapi_description: str = "stac-fastapi"
+    stac_fastapi_version: str = "0.1"
+    stac_fastapi_landing_id: str = "stac-fastapi"
+
     app_host: str = "0.0.0.0"
     app_port: int = 8000
     reload: bool = True

stac_fastapi/types/stac_fastapi/types/core.py

@@ -12,6 +12,7 @@
 from starlette.responses import Response
 
 from stac_fastapi.types import stac as stac_types
+from stac_fastapi.types.config import ApiSettings
 from stac_fastapi.types.conformance import BASE_CONFORMANCE_CLASSES
 from stac_fastapi.types.extension import ApiExtension
 from stac_fastapi.types.requests import get_base_url
@@ -22,6 +23,8 @@
 NumType = Union[float, int]
 StacType = Dict[str, Any]
 
+api_settings = ApiSettings()
+
 
 @attr.s  # type:ignore
 class BaseTransactionsClient(abc.ABC):
@@ -255,9 +258,9 @@ class LandingPageMixin(abc.ABC):
     """Create a STAC landing page (GET /)."""
 
     stac_version: str = attr.ib(default=STAC_VERSION)
-    landing_page_id: str = attr.ib(default="stac-fastapi")
-    title: str = attr.ib(default="stac-fastapi")
-    description: str = attr.ib(default="stac-fastapi")
+    landing_page_id: str = attr.ib(default=api_settings.stac_fastapi_landing_id)
+    title: str = attr.ib(default=api_settings.stac_fastapi_title)
+    description: str = attr.ib(default=api_settings.stac_fastapi_description)
 
     def _landing_page(
         self,