gaborkaszab commented on code in PR #17545:
URL: https://github.com/apache/iceberg/pull/17545#discussion_r3853114867


##########
api/src/main/java/org/apache/iceberg/EncryptableFile.java:
##########
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg;
+
+import java.nio.ByteBuffer;
+import org.apache.iceberg.encryption.EncryptionManager;
+
+/**
+ * A file that may be encrypted. If it is encrypted, its encrypted key 
metadata is tracked in the
+ * table metadata encryption keys and is referenced by a key ID.
+ */
+public interface EncryptableFile {

Review Comment:
   Renamed the interface to `FileWithEncryptedKey`



##########
api/src/main/java/org/apache/iceberg/EncryptedFile.java:
##########
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg;
+
+import java.nio.ByteBuffer;
+import org.apache.iceberg.encryption.EncryptionManager;
+
+/**
+ * A file that may be encrypted. If it is encrypted, its encrypted key 
metadata is tracked in the
+ * table metadata encryption keys and is referenced by a key ID.
+ */
+public interface EncryptableFile {
+
+  /** Location of the file. */
+  String location();
+
+  /**
+   * The file key metadata can be encrypted. Returns ID of encryption key or 
null if it's not
+   * encrypted.
+   */
+  String encryptionKeyID();

Review Comment:
   I went through this again, and I think I managed to come up with a solution 
that isn't a breaking change for custom implementations of `ManifestListFile`. 
See `EncryptionUtil.decryptKeyMetadata` functions where I introduced a 
variation that accepts the key ID from the various versions.



##########
api/src/main/java/org/apache/iceberg/FileWithEncryptedKey.java:
##########
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg;
+
+import java.nio.ByteBuffer;
+import org.apache.iceberg.encryption.EncryptionManager;
+
+/**
+ * A file that may be encrypted. If it is encrypted, its encrypted key 
metadata is tracked in the
+ * table metadata encryption keys and is referenced by a key ID.
+ */
+public interface EncryptedFile {
+
+  /** Location of the file. */
+  String location();
+
+  /** Returns the encryption key ID for this file, or null if the file is not 
encrypted. */
+  String encryptionKeyID();
+
+  /** Decrypt and return the file key metadata */
+  ByteBuffer decryptKeyMetadata(EncryptionManager em);

Review Comment:
   Hmm, with this the only purpose of putting this functionality into 
`EncryptionManager` is that its implementation in core/ can delegate to 
`EncryptionUtil` to get around the issue that `EncryptingFileIO.newInputFile()` 
is in api/ and can't call the util method in core/. I'm not entirely 
comfortable with that design, while I'm not comfortable with the current one 
either. At least we keep existing api with the current one.



##########
core/src/main/java/org/apache/iceberg/encryption/EncryptionUtil.java:
##########
@@ -140,19 +141,33 @@ public static ByteBuffer setFileLength(ByteBuffer 
keyMetadata, long fileLength)
    * @param manifestList a ManifestListFile
    * @param em the table's EncryptionManager
    * @return a decrypted key metadata buffer
+   * @deprecated since 1.12.0. Will be removed in 1.13.0; use {@link
+   *     #decryptKeyMetadata(EncryptedFile, EncryptionManager)} instead.
    */
+  @Deprecated
   public static ByteBuffer decryptManifestListKeyMetadata(
       ManifestListFile manifestList, EncryptionManager em) {
+    return decryptKeyMetadata(manifestList, em);
+  }
+
+  /**
+   * Decrypt the key metadata of an encryptable file.
+   *
+   * @param file an EncryptableFile

Review Comment:
   Thanks for spotting!



##########
core/src/main/java/org/apache/iceberg/encryption/EncryptionUtil.java:
##########
@@ -140,19 +141,33 @@ public static ByteBuffer setFileLength(ByteBuffer 
keyMetadata, long fileLength)
    * @param manifestList a ManifestListFile
    * @param em the table's EncryptionManager
    * @return a decrypted key metadata buffer
+   * @deprecated since 1.12.0. Will be removed in 1.13.0; use {@link

Review Comment:
   Giving this a second thought I think you're right. As long as we keep the 
ManifestListFile interface (until 2.0.0 as it's in api/) we have to keep the 
encryption/decryption methods for that class. Otherwise it might be a behavior 
change for custom implementation if we silently fall back to the method for 
`EncryptedFile`.



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