--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Sphinx/source/plugins/python/storage-commitment-default.py	Mon Aug 28 18:45:57 2023 +0200
@@ -0,0 +1,34 @@
+import orthanc
+import json
+
+# this plugins provides the same behavior as the default Orthanc implementation
+
+def StorageCommitmentScpCallback(jobId, transactionUid, sopClassUids, sopInstanceUids, remoteAet, calledAet):
+    # At the beginning of a Storage Commitment operation, you can build a custom data structure
+    # that will be provided as the "data" argument in the StorageCommitmentLookup
+    return None
+
+
+# Reference: `StorageCommitmentScpJob::Lookup` in `OrthancServer/Sources/ServerJobs/StorageCommitmentScpJob.cpp`
+def StorageCommitmentLookup(sopClassUid, sopInstanceUid, data):
+    success = False
+    reason = orthanc.StorageCommitmentFailureReason.NO_SUCH_OBJECT_INSTANCE
+
+    result = json.loads(orthanc.RestApiPost("/tools/lookup", sopInstanceUid))
+    if len(result) == 1:
+        tags = json.loads(orthanc.RestApiGet(result[0]["Path"] + "/simplified-tags"))
+        if all(tag in tags for tag in ["SOPClassUID", "SOPInstanceUID"]) and \
+            tags["SOPInstanceUID"] == sopInstanceUid:
+            if tags["SOPClassUID"] == sopClassUid:
+                success = True
+                reason = orthanc.StorageCommitmentFailureReason.SUCCESS
+            else:
+                # Mismatch in the SOP class UID
+                reason = orthanc.StorageCommitmentFailureReason.CLASS_INSTANCE_CONFLICT
+
+    orthanc.LogInfo("  Storage commitment SCP job: " + ("Success" if success else "Failure") + \
+                    " while looking for " + sopClassUid + " / " + sopInstanceUid)
+
+    return reason
+
+orthanc.RegisterStorageCommitmentScpCallback(StorageCommitmentScpCallback, StorageCommitmentLookup)
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