Adding Google OAuth to Phoenix

The article provides a step-by-step guide for integrating Google OAuth authentication into a Phoenix application using the Ueberauth library, covering credential setup through Google Cloud Console, dependency configuration, database schema modifications to store OAuth user data, and controller implementation for handling the OAuth callback flow. Key implementation details include storing user name, avatar URL, provider, and access token in the database while making password fields optional for OAuth users, and using Ueberauth's built-in utilities to extract and validate OAuth credentials before creating or updating user records.

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