Getting CLI authentication right: the complete guide to all 4 methods

This comprehensive overview of authentication methods used in CLI tools and services highlights the trade-offs between usability, security, and flexibility. Here's a summary and analysis:

1. Browser OAuth with PKCE:

   • Pros:
     • Strong security due to PKCE.
     • No need for API keys or secrets.
     • Can be used across multiple devices if the browser is available on the same machine.
   • Cons:
     • Requires a web browser, which limits its use in CI/CD pipelines and remote environments.
     • Slightly more complex setup compared to other methods.

2. Device Code Flow (e.g., OAuth Device Authorization):

   • Pros:
     • Works well for devices without browsers or where interactive login is not feasible.
     • Provides a secure way to authenticate remotely.
   • Cons:
     • Slightly more complex user experience due to the need to manually enter codes.
     • Requires additional infrastructure (e.g., webhooks) to handle device code verification.

3. API Keys and Personal Access Tokens:

   • Pros:
     • Simplest method for automation and scripting.
     • Works well in CI/CD pipelines, containers, and

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