Struct SenderTrustPolicyRevision

Namespace

MailFathom.Domain.Emails.Authentication

Assembly

MailFathom.Domain.dll

Names the trusted-sender policy one stored verdict was reached under.

public readonly record struct SenderTrustPolicyRevision : IEquatable<SenderTrustPolicyRevision>

Implements

IEquatable<SenderTrustPolicyRevision>

Inherited Members

ValueType.Equals(object)

ValueType.GetHashCode()

object.Equals(object, object)

object.GetType()

object.ReferenceEquals(object, object)

Remarks

A verdict outlives the policy that produced it. An operator adds a domain, a reader trusts a correspondent, an account is removed — and every message already judged keeps the answer it was judged with, because rewriting stored verdicts would change what a reader was shown without anybody having reread the mail. The revision is what makes that legible rather than silent: two verdicts carrying different revisions were reached under different lists, and one carrying None was never put to a policy at all.

It is a digest of the effective policy rather than a counter, so it needs no stored state to allocate it and the same list always names itself the same way — including after a restart, and including on a second deployment configured identically. It is not a secret and protects nothing; what it has to do is differ whenever the list does.

Fields

Length

The number of characters a revision is written as, which every column holding one is sized for.

Properties

NamesAPolicy

Gets whether this revision names a policy, which is false exactly for None.

None

Gets the revision that names no policy, which is what a verdict no policy produced carries.

Value

Gets the revision as the text a column stores, or the empty string for None.

Methods

FromStoredValue(string?)

Reads back a revision a column stored.

Of(IEnumerable<string>)

Derives the revision of a policy from the statements it is made of.

ToString()

Returns the fully qualified type name of this instance.