fix: Cannot read property 'redirect_uris' of undefined

[bluelovers]

https://stackoverflow.com/questions/61912639/typeerror-cannot-read-property-redirect-uris-of-undefined

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[gemini-code-assist]

Summary of Changes

Hello @bluelovers, 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 resolves a TypeError where redirect_uris was undefined during Google API authentication. The core of the fix involves refactoring the authentication logic within the sheets/quickstart/index.js file. By switching from @google-cloud/local-auth to direct usage of google.auth.GoogleAuth, the change ensures a more appropriate and robust authentication flow, particularly for non-browser-based scenarios, thereby eliminating the reported runtime error.

Highlights

• Authentication Method Update: The Google API authentication mechanism has been updated, transitioning from using the authenticate function provided by @google-cloud/local-auth to directly instantiating google.auth.GoogleAuth from the googleapis library.
• Credential Path Parameter Change: The parameter used to specify the path to the credentials file has been modified from keyfilePath to keyFile within the authentication configuration, aligning with the google.auth.GoogleAuth constructor.
• Dependency Streamlining: The explicit import of authenticate from the @google-cloud/local-auth package has been removed, simplifying the project's authentication setup.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a TypeError that occurs when using a service account credential file with an authentication method designed for OAuth 2.0 user consent flow. The change to google.auth.GoogleAuth is appropriate for server-to-server authentication with service accounts, and the implementation is correct. As a follow-up, you might consider removing the @google-cloud/local-auth dependency from package.json as it is no longer used.