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Developer Deploys Personal Lyrics Tool to Cloud Run With Strict Single-User Access Controls

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A developer has moved Song Lingo, a personal AI-powered lyrics learning tool built with Google's Gemini Flash, from a local machine to Google Cloud Run so it can be accessed on mobile devices. Because the app displays full song lyrics and translations, making it publicly accessible would raise copyright concerns and expose the developer's API quota to unauthorized use. To prevent this, the developer implemented Google's Identity-Aware Proxy combined with in-app signature verification, ensuring only their own account can reach the service. A planned approach using short-lived signed URLs for audio files was abandoned after the developer identified it as a security gap that could allow anyone with the URL to bypass login checks. The final setup routes all audio through Cloud Run itself, with song data stored in a private Cloud Storage bucket and API keys managed via Secret Manager.

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