Custom Swoosh adapter for Gmail API using OAuth2 authentication.

This adapter uses the Gmail API v1 with OAuth2 tokens instead of SMTP with app passwords.

Configuration

config :voile, Voile.Mailer,
  adapter: Voile.Mailer.GmailApiAdapter,
  access_token: System.get_env("VOILE_GMAIL_ACCESS_TOKEN"),
  # Optional: for token refresh
  refresh_token: System.get_env("VOILE_GMAIL_REFRESH_TOKEN"),
  client_id: System.get_env("VOILE_GMAIL_CLIENT_ID"),
  client_secret: System.get_env("VOILE_GMAIL_CLIENT_SECRET")

Getting Initial Tokens

You can get tokens using the GmailAuth module:

# Get authorization URL
url = Voile.Mailer.GmailAuth.authorization_url()

# After user authorizes, exchange code for tokens
{:ok, tokens} = Voile.Mailer.GmailAuth.get_tokens(code)

Store the access_token and refresh_token in your environment variables.