Struct UserAttributeSimilarityValidator 

pub struct UserAttributeSimilarityValidator {
    pub threshold: f64,
}

Reject passwords that are too similar to the username or the email local-part. Uses a similarity ratio with a 0.7 threshold, approximated with a cheaper two-pronged check that catches the same real-world cases:

1. Substring containment — the password contains the attribute (or vice-versa), case-insensitive. Catches alice → alice123.
2. Character-overlap ratio — the fraction of the attribute’s characters present in the password is >= threshold. Catches rearrangements / interleavings that substring containment misses.

Attributes shorter than 3 characters are skipped (a 1-char username would match almost everything). The email is checked both whole and as its local-part (before @).

Fields

threshold: f64

Overlap ratio at or above which the password is rejected. The default is 0.7.

Trait Implementations

impl Clone for UserAttributeSimilarityValidator

fn clone(&self) -> UserAttributeSimilarityValidator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for UserAttributeSimilarityValidator

impl Debug for UserAttributeSimilarityValidator

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

Formats the value using the given formatter.

impl Default for UserAttributeSimilarityValidator

fn default() -> Self

Returns the “default value” for a type.

impl PasswordValidator for UserAttributeSimilarityValidator

fn validate( &self, password: &str, ctx: &PasswordContext<'_>, ) -> Result<(), String>

Check password against this rule. ctx carries the user attributes a rule may compare against (only the similarity rule uses it today). Return Err(reason) to reject.