Struct RestrictiveValidator 

pub struct RestrictiveValidator {
    pub reserved_prefixes: Vec<String>,
    pub max_levels: Option<usize>,
    pub max_topic_length: Option<usize>,
    pub prohibited_chars: Vec<char>,
}

Restrictive validator with additional constraints

This validator extends the standard MQTT rules with additional restrictions such as reserved topic prefixes, maximum topic levels, and custom character sets.

Fields

reserved_prefixes: Vec<String>

Reserved topic prefixes that should be rejected

max_levels: Option<usize>

Maximum number of topic levels (separated by ‘/’)

max_topic_length: Option<usize>

Maximum topic length (overrides MQTT spec if smaller)

prohibited_chars: Vec<char>

Prohibited characters beyond MQTT spec requirements

Implementations

impl RestrictiveValidator

pub fn new() -> Self

Creates a new restrictive validator

pub fn with_reserved_prefix(self, prefix: impl Into<String>) -> Self

Adds a reserved topic prefix

pub fn with_max_levels(self, max_levels: usize) -> Self

Sets the maximum number of topic levels

pub fn with_max_topic_length(self, max_length: usize) -> Self

Sets the maximum topic length

pub fn with_prohibited_char(self, ch: char) -> Self

Adds a prohibited character

Trait Implementations

impl Clone for RestrictiveValidator

fn clone(&self) -> RestrictiveValidator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RestrictiveValidator

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

Formats the value using the given formatter.

impl Default for RestrictiveValidator

fn default() -> RestrictiveValidator

Returns the “default value” for a type.

impl TopicValidator for RestrictiveValidator

fn validate_topic_name(&self, topic: &str) -> Result<()>

Validates a topic name for publishing

fn validate_topic_filter(&self, filter: &str) -> Result<()>

Validates a topic filter for subscriptions

fn is_reserved_topic(&self, topic: &str) -> bool

Checks if a topic is reserved and should be restricted

fn description(&self) -> &'static str

Gets a human-readable description of the validator