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defmodule WalletIntegrations.SecretProvider do |
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@moduledoc """ |
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Behaviour for loading provider credentials at runtime. |
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Implementations must never source credentials from plaintext config |
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files committed to source control (ADR 0006 / ADR 0008). |
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## Implementations |
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- `WalletIntegrations.SecretProvider.EnvSecretProvider` — reads from application env. |
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Suitable for development, CI, and secrets-manager-injected env (e.g. AWS SSM, Vault sidecar). |
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""" |
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@callback get_secret(key :: atom()) :: {:ok, String.t()} | {:error, :secret_not_found} |
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@doc "Resolve the configured secret provider module." |
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@spec provider() :: module() |
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def provider do |
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Application.get_env( |
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:wallet_integrations, |
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:secret_provider, |
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WalletIntegrations.SecretProvider.EnvSecretProvider |
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) |
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end |
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@doc "Convenience: fetch a secret via the configured provider." |
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@spec get(key :: atom()) :: {:ok, String.t()} | {:error, :secret_not_found} |
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def get(key) do |
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apply(provider(), :get_secret, [key]) |
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end |
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end |
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defmodule WalletIntegrations.SecretProvider.EnvSecretProvider do |
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@moduledoc """ |
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Application-env-backed secret provider. |
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In production, these values should be injected by a secrets manager |
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(e.g. AWS SSM Parameter Store, HashiCorp Vault sidecar agent) and never |
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hardcoded in config files. |
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Keys used: |
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- `:stripe_secret_key` — Stripe API secret key (sk_test_... or sk_live_...) |
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- `:stripe_webhook_secret` — Stripe webhook signing secret (whsec_...) |
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""" |
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@behaviour WalletIntegrations.SecretProvider |
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@impl true |
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def get_secret(key) do |
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case Application.get_env(:wallet_integrations, key) do |
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nil -> {:error, :secret_not_found} |
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value when is_binary(value) -> {:ok, value} |
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_ -> {:error, :secret_not_found} |
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end |
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end |
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end |