chore: Restrict GraphServer to localhost traffic only in Jupyter mode

[ericfe-google]

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @ericfe-google, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the security posture of the GraphServer component within Jupyter environments. By explicitly configuring the server to only accept connections from the local machine, it significantly reduces the potential attack surface and ensures that the service is not inadvertently exposed to external network traffic.

Highlights

• Security Enhancement: The GraphServer in Jupyter mode is now explicitly bound to the 127.0.0.1 (localhost) address, preventing it from listening on all network interfaces.

Changelog

• bigquery_magics/graph_server.py
  • Updated the ThreadedTCPServer binding address to 127.0.0.1 to restrict traffic to localhost.

Activity

• No specific activity (comments, reviews, progress) was found in the provided context.

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[gemini-code-assist]

Code Review

This pull request updates the GraphServer to bind to the localhost address 127.0.0.1 instead of all available network interfaces. This is a good security enhancement as it restricts server access to the local machine only, which is the intended use case for the Jupyter environment. The change correctly implements this restriction and aligns with security best practices.

[tswast]

Thanks!