[HOTFIX] Validate note access for interpreter bindings

[jongyoul]

What is this PR for?

Ensure that interpreter binding operations follow the permissions of the associated note.

• Reading interpreter bindings requires reader permission.
• Updating interpreter bindings requires writer permission.
• Requests without the required permission stop before returning binding data or applying changes.
• Add regression tests for permitted and rejected read/write requests.

What type of PR is it?

Hot Fix

Todos

• Add note permission checks for interpreter binding operations
• Add regression tests
• Run NotebookServerTest

What is the Jira issue?

N/A

How should this be tested?

mkdir -p spark/interpreter/target
./mvnw -pl spark/interpreter resources:resources@copy-interpreter-setting
./mvnw -pl zeppelin-server -Dtest=NotebookServerTest test

Result: 25 tests run, 0 failures, 0 errors.

Screenshots (if appropriate)

N/A

Questions:

• Does the license files need to update? No.
• Is there breaking changes for older versions? No API compatibility changes. Requests without the required note permission are now rejected as intended.
• Does this needs documentation? No.

[Copilot]

Pull request overview

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This hotfix enforces note-level permissions for interpreter binding operations so that binding reads/writes are rejected unless the caller has the appropriate note access.

Changes:

• Add reader permission check to GET_INTERPRETER_BINDINGS.
• Add writer permission check to SAVE_INTERPRETER_BINDINGS and suppress successful response when unauthorized.
• Add regression tests covering permitted and rejected read/write requests.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
zeppelin-server/src/main/java/org/apache/zeppelin/socket/NotebookServer.java	Adds authz gates for reading/writing interpreter bindings and conditions response on authorization.
zeppelin-server/src/test/java/org/apache/zeppelin/socket/NotebookServerTest.java	Adds regression tests verifying authz enforcement for interpreter binding read/write operations.

Suppressed comments (1)

zeppelin-server/src/main/java/org/apache/zeppelin/socket/NotebookServer.java:1

• permitted is returned as true even when note == null (line 649), which makes the method send an OP.INTERPRETER_BINDINGS response for a non-existent note. If permitted is intended to reflect “authorized & actionable”, return false when note == null (and consider initializing permitted to false and setting it to true only after both the permission check passes and the note exists). This keeps the response behavior consistent with the intention of “stop before returning binding data or applying changes.”

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