feat: reduce pystac length by keeping only data asset (#126)

* feat: reduce pystac length by keeping only data asset

* chore: update version

Author: wphyojpl

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.1.0] - 2023-01-23
+### Added
+- [#126](https://github.com/unity-sds/unity-data-services/pull/126) reduce pystac length by keeping only data asset
+
 ## [3.0.0] - 2023-03-27
 ### Breaking
 - [#124](https://github.com/unity-sds/unity-data-services/pull/124) configurable file postfixes for PDS metadata extraction + rename function names which will break previous terraforms

cumulus_lambda_functions/cumulus_stac/item_transformer.py

@@ -409,5 +409,5 @@ def to_stac(self, source: dict) -> dict:
         ]
         return stac_item.to_dict(include_self_link=False, transform_hrefs=False)
 
-    def from_stac(self, source: dict) -> dict:
-        return {}
+    def from_stac(self, source: dict) -> Item:
+        return Item.from_dict(source)

cumulus_lambda_functions/cumulus_stac/stac_utils.py

@@ -0,0 +1,14 @@
+from cumulus_lambda_functions.cumulus_stac.item_transformer import ItemTransformer
+
+
+class StacUtils:
+    @staticmethod
+    def reduce_stac_list_to_data_links(input_stac_granules_list: [dict]):
+        """
+        :param input_stac_granules_list: list of pystac dictionaries
+        :return: [dict] - list of assets which has data key
+        """
+        pystac_items = [ItemTransformer().from_stac(k) for k in input_stac_granules_list]
+        assets = [k.get_assets() for k in pystac_items]
+        data_assets = [{'assets': {'data': k['data'].to_dict()}} for k in assets if 'data' in k]
+        return data_assets

setup.py

@@ -17,7 +17,7 @@
 
 setup(
     name="cumulus_lambda_functions",
-    version="3.0.0",
+    version="3.1.0",
     packages=find_packages(),
     install_requires=install_requires,
     tests_require=['mock', 'nose', 'sphinx', 'sphinx_rtd_theme', 'coverage', 'pystac', 'python-dotenv', 'jsonschema'],