Add example in python to download all referenced reality data in cont… (

#79)

.github/CODEOWNERS

@@ -14,4 +14,3 @@ typescript/packages/reality-data-client/ @mcote01 @MarcBedard8
 
 # not an actual reality capture api
 typescript/packages/reality-data-transfer/ @dbiguenet @RenaudKeriven
-

python/examples/example_download_everything_in_context_scene.py

@@ -0,0 +1,115 @@
+# Copyright (c) Bentley Systems, Incorporated. All rights reserved.
+# See LICENSE.md in the project root for license terms and full copyright notice.
+
+# Sample downloading a context scene and all the reality data referenced in it.
+# Download reality data in sub folders names "ref0", "ref1"...
+
+import reality_apis.DataTransfer.reality_data_transfer as DataTransfer
+from token_factory.token_factory import ClientInfo, SpaDesktopMobileTokenFactory
+
+from reality_apis.utils import RealityDataType
+from config import project_id, client_id
+import json
+import os
+import xml.etree.ElementTree as Et
+
+
+def main():
+    context_scene_cloud_id = r"Context scene identifier in Context Share"
+    context_scene_file_name = r"Context scene file name (include extension)"
+    output_path = r"path to the folder where you want to save downloaded files"
+
+    scope_set = {
+        "realitydata:modify",
+        "realitydata:read",
+    }
+    # only for desktop/mobile applications
+    scope_set.add("offline_access")
+
+    client_info = ClientInfo(client_id, scope_set)
+    token_factory = SpaDesktopMobileTokenFactory(client_info)
+
+    # initializing data transfer
+    data_transfer = DataTransfer.RealityDataTransfer(token_factory)
+    # adding hook to follow upload and download status
+    data_transfer.set_progress_hook(DataTransfer.example_hook)
+    print("Data transfer initialized")
+
+    # download context scene
+    print("Downloading context scene...")
+    ret_down = data_transfer.download_context_scene(context_scene_cloud_id, output_path, project_id)
+    if ret_down.is_error():
+        print(
+            "Error while downloading output with id {}: {}".format(
+                context_scene_cloud_id, ret_down.error
+            )
+        )
+        exit(1)
+    print("Successfully downloaded context scene")
+
+    print("Parse context scene and download reality data...")
+    context_scene_local_path = os.path.join(output_path, context_scene_file_name)
+    ref_index = 0
+    with open(context_scene_local_path, "r", encoding="utf-8") as file:
+        if context_scene_local_path.endswith('.xml'):
+            # xml (deprecated)
+            tree = Et.ElementTree()
+            tree.parse(file)
+            root = tree.getroot()
+            if root.tag != "ContextScene":
+                print("Invalid ContextScene")
+                exit(1)
+            refs = root.find("References")
+            if refs is not None:
+                for reference in refs.findall("Reference"):
+                    ref_path = reference.find("Path")
+                    if ref_path is None:
+                        print("Error while parsing the context scene : Path not found in reference")
+                        exit(1)
+                    ref_path_cloud_id = ref_path.text[4:]
+                    ref_output_path = os.path.join(output_path, "ref" + str(ref_index))
+                    # download reality data
+                    print("Downloading reality data ", ref_path_cloud_id, "...")
+                    ret_down = data_transfer.download_reality_data(ref_path_cloud_id, ref_output_path, project_id)
+                    if ret_down.is_error():
+                        print(
+                            "Error while downloading output with id {}: {}".format(
+                                ref_path_cloud_id, ret_down.error
+                            )
+                        )
+                        exit(1)
+                    print("Successfully downloaded reality data")
+                    ref_index += 1
+
+        elif context_scene_local_path.endswith('.json'):
+            # json
+            data = json.load(file)
+            refs = data.get("References", None)
+            if refs is not None:
+                for ref_nb in refs.values():
+                    ref_path = ref_nb.get("Path", None)
+                    if ref_path is None:
+                        print("Error while parsing the context scene : Path not found in reference")
+                        exit(1)
+                    ref_path_cloud_id = ref_path[4:]
+                    ref_output_path = os.path.join(output_path, "ref" + str(ref_index))
+                    # download reality data
+                    print("Downloading reality data ", ref_path_cloud_id, "...")
+                    ret_down = data_transfer.download_reality_data(ref_path_cloud_id, ref_output_path, project_id)
+                    if ret_down.is_error():
+                        print(
+                            "Error while downloading output with id {}: {}".format(
+                                ref_path_cloud_id, ret_down.error
+                            )
+                        )
+                        exit(1)
+                    print("Successfully downloaded reality data")
+                    ref_index += 1
+        else:
+            print("Unsupported file extension")
+            exit(1)
+        print("Successfully downloaded all reality data from context scene")
+
+
+if __name__ == "__main__":
+    main()