Mailglass.Config (Mailglass v0.3.2)

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Runtime configuration for mailglass, validated at boot via NimbleOptions.

Only this module may call Application.compile_env*. Every other module reads configuration through Application.get_env/2 (enforced by the LINT-08 Credo check in Phase 6).

The brand theme (D-19) is cached in :persistent_term after validation so the render hot path reads it in O(1) without re-parsing the Application env on every message.

Options

  • :feedback_id - Optional Feedback-ID prefix (RFC 8058/Deliverability). When set, auto-populates as {sender_id}:{mailable}:{tenant_id}:{stream}. The default value is nil.

  • :repo - The adopter's Ecto.Repo module. Required from Phase 2+ onwards. The default value is nil.

  • :adapter (term/0) - Adapter module or {module, opts} tuple. Default: the Fake adapter. The default value is {Mailglass.Adapters.Fake, []}.

  • :theme (keyword/0) - Brand theme tokens. See Mailglass.Components.Theme. The default value is [].

    • :colors (map/0) - Brand color map. Keys: :ink, :glass, :ice, :mist, :paper, :slate. The default value is %{ink: "#0D1B2A", glass: "#277B96", ice: "#A6EAF2", mist: "#EAF6FB", paper: "#F8FBFD", slate: "#5C6B7A"}.

    • :fonts (map/0) - Font-stack map. Keys: :body, :display, :mono. The default value is %{display: "'Inter Tight', 'Inter', sans-serif", body: "'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif", mono: "'IBM Plex Mono', ui-monospace, monospace"}.

  • :telemetry (keyword/0) - Telemetry options. The default value is [].

    • :default_logger (boolean/0) - Attach the default logger handler at boot. Default: false. The default value is false.

  • :renderer (keyword/0) - Renderer options. The default value is [].

    • :css_inliner - CSS inlining backend. Default: :premailex. The default value is :premailex.

    • :plaintext (boolean/0) - Auto-generate a plaintext body alongside the HTML body. Default: true. The default value is true.

  • :tenancy - Module implementing Mailglass.Tenancy. Default: nil (single-tenant mode). The default value is nil.

  • :suppression_store - Module implementing Mailglass.SuppressionStore. Default: Mailglass.SuppressionStore.Ecto. The default value is Mailglass.SuppressionStore.Ecto.

  • :async_adapter - Async delivery adapter for deliver_later/2. :oban (default, durable) or :task_supervisor (non-durable fallback). Use :task_supervisor to silence the boot warning when Oban is deliberately not in deps. The default value is :oban.

  • :rate_limit (keyword/0) - Rate-limiter configuration (SEND-02). The default value is [].

    • :default (keyword/0) - Default per-(tenant, domain) bucket. Capacity + per-minute refill. The default value is [capacity: 100, per_minute: 100].

    • :overrides (list of term/0) - Per-(tenant_id, domain) overrides as list of {{tenant_id, domain}, opts} tuples. The default value is [].

  • :tracking (keyword/0) - Open/click tracking configuration (TRACK-03). When any mailable enables opens or clicks, :host is REQUIRED or boot raises %ConfigError{type: :tracking_host_missing}. The default value is [].

    • :endpoint - Phoenix.Token endpoint/secret override for open/click tracking. When nil, Mailglass.Tracking.endpoint/0 falls back to :adapter_endpoint. The default value is nil.

    • :host - Tracking subdomain (e.g. track.example.com). Must be separate from the adopter's main app host. The default value is nil.

    • :scheme - URL scheme. http only for dev. The default value is "https".

    • :salts (list of String.t/0) - Phoenix.Token salts. Head signs; all verify (rotation support). The default value is [].

    • :max_age (pos_integer/0) - Token max age in seconds. Default: 2 years. The default value is 63072000.

  • :compliance (keyword/0) - RFC 8058 unsubscribe configuration. Phase 11 reads this subtree through Mailglass.Config accessors only so router/controller/token code avoids new direct compile-env lookups. The default value is [].

    • :endpoint - Phoenix.Token endpoint/secret override for unsubscribe signing. When nil, Mailglass.Config.compliance_endpoint/0 falls back to the tracking endpoint chain. The default value is nil.

    • :host - Canonical host used for unsubscribe URLs (for example unsubscribe.example.com). The default value is nil.

    • :scheme - Unsubscribe URL scheme. http is intended for local development only. The default value is "https".

    • :mount_path (String.t/0) - Absolute path prefix used when generating unsubscribe URLs. The default value is "/mailglass/unsubscribe".

    • :previous_secrets (list of String.t/0) - Raw prior secret_key_base values accepted during unsubscribe token verification after endpoint-secret rotation. The default value is [].

    • :redirect - Optional GET unsubscribe redirect escape hatch (for example /settings/unsubscribe). The default value is nil.

    • :max_age (pos_integer/0) - Unsubscribe token max age in seconds. Default: 2 years. The default value is 63072000.

    • :lifecycle (atom/0) - Module implementing Mailglass.Lifecycle for transaction-local unsubscribe side effects. The default value is Mailglass.Lifecycle.Noop.

  • :clock - Module implementing utc_now/0. Default: Mailglass.Clock.System. Tests use Mailglass.Clock.Frozen-backed per-process freezing without overriding this key. The default value is nil.

  • :postmark (keyword/0) - Postmark webhook configuration (HOOK-03). The default value is [].

    • :enabled (boolean/0) - Enable the Postmark webhook route. Default: true. The default value is true.

    • :basic_auth - Basic Auth {user, password} tuple. Required for signature verification; omit only if the provider is disabled. The default value is nil.

    • :ip_allowlist (list of String.t/0) - Opt-in list of CIDR strings (e.g. ["50.31.156.0/24"]). Off by default per D-04 — Postmark's origin IPs can change. The default value is [].

  • :sendgrid (keyword/0) - SendGrid webhook configuration (HOOK-04). The default value is [].

    • :enabled (boolean/0) - Enable the SendGrid webhook route. Default: true. The default value is true.

    • :public_key - Base64-encoded SubjectPublicKeyInfo DER (NOT PEM — SendGrid's dashboard ships raw DER without -----BEGIN PUBLIC KEY----- framing). Required for signature verification; omit only if the provider is disabled. The default value is nil.

    • :timestamp_tolerance_seconds (pos_integer/0) - Replay tolerance window in seconds. Default: 300 (Stripe / Svix / Standard Webhooks consensus). The default value is 300.

  • :mailgun (keyword/0) - Mailgun webhook configuration. The default value is [].

    • :enabled (boolean/0) - Enable the Mailgun webhook route when explicitly mounted. The default value is true.

    • :signing_key - Mailgun webhook signing key used for HMAC verification. Required for signature verification; omit only if the provider is disabled. The default value is nil.

    • :timestamp_tolerance_seconds (pos_integer/0) - Maximum accepted age for the Mailgun signature timestamp in seconds. Default: 28_800. The default value is 28800.

    • :future_skew_seconds (pos_integer/0) - Maximum accepted future skew for the Mailgun signature timestamp in seconds. Default: 300. The default value is 300.

    • :replay_cache_ttl_seconds (pos_integer/0) - Replay cache retention window for Mailgun tokens in seconds. Default: 28_800. The default value is 28800.

  • :webhook_retention (keyword/0) - Retention policy for mailglass_webhook_events rows (HOOK-06). The default value is [].

    • :succeeded_days - Days to retain :succeeded webhook_events before the Pruner deletes them. Set to :infinity to disable. Default: 14. The default value is 14.

    • :dead_days - Days to retain :dead (terminal-after-retries) webhook_events before the Pruner deletes them. Set to :infinity to disable. Default: 90. The default value is 90.

    • :failed_days - Days to retain :failed (investigatable) webhook_events. Default: :infinity (never prune). The default value is :infinity.

Boot sequence

# lib/mailglass/application.ex
def start(_type, _args) do
  Mailglass.Config.validate_at_boot!()
  # ...
end

Raises NimbleOptions.ValidationError on invalid configuration. Raising at boot is intentional — a misconfigured mailer should never limp into production serving half-rendered mail.

Summary

Functions

compliance()

Returns the validated compliance subtree with defaults applied.

compliance_endpoint()

Resolves the current unsubscribe signing endpoint.

compliance_host()
compliance_lifecycle()
compliance_max_age()
compliance_mount_path()
compliance_previous_secrets()
compliance_redirect()
compliance_scheme()
get_theme()

Returns the cached brand theme keyword list.

new!(opts \\ [])

Validates and returns a keyword list of options.

validate_at_boot!()

Reads the :mailglass Application env, validates it against the schema, and caches the brand theme in :persistent_term.

Functions

compliance()

(since 0.1.0) 
@spec compliance() :: keyword()

Returns the validated compliance subtree with defaults applied.

compliance_endpoint()

(since 0.1.0) 
@spec compliance_endpoint() :: module() | binary()

Resolves the current unsubscribe signing endpoint.

Falls back to Mailglass.Tracking.endpoint/0 so unsubscribe tokens reuse the same endpoint-secret chain unless adopters opt into a compliance-specific override.

compliance_host()

(since 0.1.0) 
@spec compliance_host() :: String.t() | nil

compliance_lifecycle()

(since 0.1.0) 
@spec compliance_lifecycle() :: module()

compliance_max_age()

(since 0.1.0) 
@spec compliance_max_age() :: pos_integer()

compliance_mount_path()

(since 0.1.0) 
@spec compliance_mount_path() :: String.t()

compliance_previous_secrets()

(since 0.1.0) 
@spec compliance_previous_secrets() :: [String.t()]

compliance_redirect()

(since 0.1.0) 
@spec compliance_redirect() :: String.t() | nil

compliance_scheme()

(since 0.1.0) 
@spec compliance_scheme() :: String.t()

get_theme()

(since 0.1.0) 
@spec get_theme() :: keyword()

Returns the cached brand theme keyword list.

Requires validate_at_boot!/0 to have been called first. Returns an empty list if the cache is unset (the caller is responsible for ensuring the boot sequence has completed).

new!(opts \\ [])

(since 0.1.0) 
@spec new!(keyword()) :: keyword()

Validates and returns a keyword list of options.

Fills in defaults, raises NimbleOptions.ValidationError on unknown keys or invalid values. Used primarily by validate_at_boot!/0; callers rarely invoke this directly.

Examples

iex> config = Mailglass.Config.new!([])
iex> Keyword.fetch!(config, :adapter)
{Mailglass.Adapters.Fake, []}

validate_at_boot!()

(since 0.1.0) 
@spec validate_at_boot!() :: :ok

Reads the :mailglass Application env, validates it against the schema, and caches the brand theme in :persistent_term.

Called from Mailglass.Application.start/2. Raises NimbleOptions.ValidationError if the Application env is invalid.

When [telemetry: [default_logger: true]] is configured, the default logger handler is attached here.