fix: empty body (#15)

For items that need to be ordered, we provide a retrieve link using a
POST request with a body to place the order.
This PR removes the body when it's empty.
The POST request can now be made without a body when it's not needed.

Author: cauriol

stac_fastapi/eodag/config.py

@@ -31,6 +31,7 @@
 
 class Settings(ApiSettings):
     """EODAG Server config"""
+
     debug: bool = False
 
     keep_origin_url: bool = Field(

stac_fastapi/eodag/extensions/collection_order.py

@@ -73,16 +73,21 @@ def order_collection(
         self,
         collection_id: str,
         request: Request,
-        request_body: CollectionOrderBody,
+        request_body: Optional[CollectionOrderBody] = None,
     ) -> Item:
         """Order a product with its collection id and a fake id"""
 
         dag = cast(EODataAccessGateway, request.app.state.dag)
 
-        federation_backend = request_body.federation_backends[0] if request_body.federation_backends else None
+        if request_body is None:
+            federation_backend = None
+            request_params = {}
+        else:
+            federation_backend = request_body.federation_backends[0] if request_body.federation_backends else None
 
-        request_params = request_body.model_dump(exclude={"federation_backends": True})
+            request_params = request_body.model_dump(exclude={"federation_backends": True})
         search_results = dag.search(productType=collection_id, provider=federation_backend, **request_params)
+
         if len(search_results) > 0:
             product = cast(EOProduct, search_results[0])
 
@@ -152,7 +157,7 @@ def register(self, app: FastAPI) -> None:
 
         async def _retrieve_endpoint(
             request: Request,
-            request_data: CollectionOrderBody,
+            request_data: Optional[CollectionOrderBody] = None,
             request_path: CollectionOrderUri = Depends(),  # noqa: B008
         ):
             """Retrieve endpoint."""

stac_fastapi/eodag/extensions/pagination.py

@@ -17,7 +17,6 @@
 # limitations under the License.
 """Pagination extension. Override to default page to 1."""
 
-from dataclasses import dataclass
 from typing import Annotated
 
 import attr

stac_fastapi/eodag/models/links.py

@@ -286,11 +286,14 @@ def link_collection(self) -> dict[str, str]:
     def collection_order_extension_link_retrieve(self) -> Optional[dict[str, Any]]:
         """Create the `retrieve` link."""
         href = self.resolve(f"collections/{self.collection_id}/order")
-        return {
+        link = {
             "rel": "retrieve",
             "type": MimeTypes.geojson.value,
             "href": href,
             "method": "POST",
-            "body": self.retrieve_body or {},
             "title": "Retrieve",
         }
+        if self.retrieve_body:
+            link["body"] = self.retrieve_body
+
+        return link