Enum SessionIdFormat 

#[non_exhaustive]
pub enum SessionIdFormat {
    Ulid,
    Uuid,
    Custom(Regex),
}

Format whitelist entry for SessionIdPolicy.

Built-in Self::Ulid and Self::Uuid cases carry conservative entropy estimates; Self::Custom takes an adopter-supplied regex and contributes zero entropy by default (the policy’s min_entropy_bits decides whether it passes).

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Ulid

Crockford Base32 ULID (26 ASCII characters; first character 0..='7'). Effective entropy: 80 bits (random component).

Uuid

Canonical hyphenated UUID (8-4-4-4-12 lowercase or uppercase hex). Effective entropy: 122 bits (assuming v4).

Custom(Regex)

Adopter-defined format. Validation is just the regex match; entropy estimation is left to the adopter (defaults to 0 bits — combine with a lower min_entropy_bits or an explicit override on the policy).

Implementations

impl SessionIdFormat

pub fn matches(&self, id: &str) -> bool

True if id matches this format.

pub fn effective_entropy_bits(&self) -> u32

Conservative lower bound on the effective entropy of an id matching this format. Custom returns 0 — adopters with a tight regex can lower SessionIdPolicy::min_entropy_bits to a value the regex’s structure guarantees, or wrap their own pre-validation upstream.

Trait Implementations

impl Clone for SessionIdFormat

fn clone(&self) -> SessionIdFormat

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SessionIdFormat

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.