Invitation flows: Enforcement architecture
Specifies where and how invitation flows is evaluated across backend, frontend, jobs, caches, and integrations. This reference fixes the adoption boundary, failure behavior, and observable evidence while leaving environment-specific limits configurable.
Package status: reference context ready for human review. The contract and test scenarios are complete, but no claim is made that an adopting implementation has passed them.
Decision
For Invitation flows, adopt a centralized server-side policy decision using authenticated subject and resource context. Use one owned boundary, explicit state model, and versioned interfaces; keep policy decisions separate from adapters and side effects. This architecture block focuses specifically on enforcement architecture. This package is a reference contract: the adopting team must choose numeric limits, providers, jurisdictions, and operational owners from evidence in its own environment.
Scope
- The Invitation flows actors, inputs, outputs, states, policy or schema versions, and externally visible outcomes required for the enforcement architecture focus of this architecture block.
- Primary and alternate interfaces, background work, caches, integrations, support paths, and evidence that can exercise the same boundary.
- Adoption-specific configuration, rollout, recovery, and verification responsibilities needed to apply the reference safely.
Outside this block
- Choosing a universal vendor, framework, jurisdiction, numeric threshold, retention period, or service-level objective for every adopter.
- Claiming that packaged scenarios have run against a downstream implementation or that this reference grants legal, security, or accessibility certification.
Contract
- Deny by default when subject, action, resource ownership, tenant, or policy version is missing or contradictory.
- Apply the same resource scope to primary records, indexes, caches, files, jobs, exports, aggregates, and support tooling.
- Do not treat a hidden UI control, client claim, route name, or hard-to-guess identifier as authorization evidence.
- Record policy version, subject, resource, action, result, and safe reason for privileged and denied decisions.
- Document component ownership and allowed dependency direction, including which data may cross each boundary.
- Make synchronous, asynchronous, and batch paths implement the same authority and state invariants.
- Issue a single-purpose protected invitation bound to tenant, role or permissions, inviter, intended recipient rule, expiry, and one-time acceptance state.
- Re-authorize inviter and target scope at acceptance, prevent account or tenant confusion, handle existing membership and revocation, and make repeated delivery and acceptance idempotent.
- For the enforcement architecture variant, enforce this declared boundary: specifies where and how invitation flows is evaluated across backend, frontend, jobs, caches, and integrations.
Implementation guidance
- Start with the domain state and interface contract, then attach adapters, storage, queues, and provider-specific code.
- Model Invitation flows inputs, outputs, actors, states, invariants, side effects, and evidence before selecting framework or vendor details.
- Store the applicable Invitation flows contract or policy version with material state so migrations, replay, and support decisions remain attributable.
- Introduce the path behind controlled rollout, compare expected and observed outcomes, and keep a tested recovery route until adoption evidence is complete.
Failure handling and safeguards
- Policy service or context failure denies the protected operation and emits a bounded, non-sensitive investigation signal.
- Invalid or contradictory Invitation flows state is rejected or quarantined; the implementation never guesses a value that broadens authority or duplicates an effect.
- Retries are bounded and use durable identity; after exhaustion, work reaches an inspectable terminal state with an accountable owner.
Verification and operations
- Exercise the contract through each adapter and prove that a failed dependency cannot bypass the authoritative boundary.
- Monitor Invitation flows success, denial, validation failure, dependency failure, retry exhaustion, and recovery by contract version without sensitive payload dimensions.
- Re-run paired positive and negative fixtures after policy, schema, dependency, migration, or boundary changes and preserve the resulting evidence.
Adoption assumptions
- Names and values in the example are a concrete fixture, not universal defaults; adopters replace them through documented evidence and ownership.
- The adopting system can provide authenticated identity, durable operation or record versions, bounded telemetry, and a controlled path for change.
The executable-looking examples in this package are fixtures and acceptance contracts. Run the collection validator to check structure and metadata, then translate and execute the scenarios in the target repository before recording implementation evidence.