fix: close Walloon terrain provisioning

backend/app/services/spw_terrain_service.py

@@ -56,12 +56,27 @@ class SpwTerrainService:
     def _source_path(settings: Settings) -> Path:
         return Path(settings.spw_terrain_source_dir) / SpwTerrainService.SOURCE_FILENAME
 
+    @staticmethod
+    def _source_sha256(settings: Settings) -> str | None:
+        checksum_path = (
+            Path(settings.spw_terrain_source_dir)
+            / SpwTerrainService.SOURCE_SHA256_FILENAME
+        )
+        if not checksum_path.is_file():
+            return None
+        parts = checksum_path.read_text(encoding="ascii").strip().split()
+        digest = parts[0].lower() if parts else ""
+        if len(digest) != 64 or any(character not in "0123456789abcdef" for character in digest):
+            return None
+        return digest
+
     @staticmethod
     def list_products(*, settings: Settings | None = None) -> list[dict[str, Any]]:
         resolved = settings or get_settings()
         configured = (
             resolved.spw_terrain_enabled
             and SpwTerrainService._source_path(resolved).is_file()
+            and SpwTerrainService._source_sha256(resolved) is not None
         )
         product = SpwTerrainProductRead(
             key=SpwTerrainService.PRODUCT_KEY,
@@ -338,12 +353,16 @@ class SpwTerrainService:
                 status_code=503,
             )
         source_path = SpwTerrainService._source_path(resolved)
-        if not source_path.is_file():
+        source_sha256 = SpwTerrainService._source_sha256(resolved)
+        if not source_path.is_file() or source_sha256 is None:
             raise AppError(
                 code="SPW_TERRAIN_SOURCE_NOT_PROVISIONED",
-                message="The official SPW MNT source archive has not been provisioned on this runtime",
+                message="The official SPW MNT source and checksum have not been provisioned on this runtime",
                 details={
                     "expected_path": str(source_path),
+                    "expected_checksum_path": str(
+                        source_path.with_name(SpwTerrainService.SOURCE_SHA256_FILENAME)
+                    ),
                     "operator_command": "python scripts/provision_spw_terrain_source.py",
                 },
                 status_code=503,
@@ -390,14 +409,6 @@ class SpwTerrainService:
         content, validation = SpwTerrainService._read_source_window(
             source_path, scope, resolution, resolved
         )
-        source_sha256_path = source_path.with_name(
-            SpwTerrainService.SOURCE_SHA256_FILENAME
-        )
-        source_sha256 = (
-            source_sha256_path.read_text(encoding="ascii").strip().split()[0]
-            if source_sha256_path.is_file()
-            else None
-        )
         acquired_at = datetime.now(UTC)
         dataset = DatasetService.import_raster_bytes(
             db,
@@ -410,7 +421,7 @@ class SpwTerrainService:
             observed_at=datetime(2022, 3, 5, 23, 59, 59, tzinfo=UTC),
             valid_from=datetime(2021, 2, 19, tzinfo=UTC),
             valid_to=datetime(2022, 3, 5, 23, 59, 59, tzinfo=UTC),
-            temporal_granularity="acquisition_period",
+            temporal_granularity="period",
             source_version="RELIEF_WALLONIE_MNT_1M_2021_2022",
             source_metadata={
                 "provider": SpwTerrainService.PROVIDER,