Struct Challenge 

pub struct Challenge {
    pub challenge_id: String,
    pub verify_url: String,
    pub pkce_verifier: Option<String>,
    pub nonce: String,
    pub expires_at: u64,
}

A provider-issued challenge. The verify_url is what we surface to the user; the optional state-bag (pkce_verifier, nonce) is what we hold privately so we can validate the callback.

Fields

challenge_id: String

verify_url: String

The URL the user opens in a browser to complete verification. For real OAuth providers this is the authorize URL with a state=<challenge_id> query param. For the mock provider it’s the local server’s /verify/<id> endpoint.

pkce_verifier: Option<String>

PKCE verifier (for OAuth 2.0 + PKCE flows). Stored alongside the challenge so the callback handler can complete the token exchange.

nonce: String

Anti-replay nonce embedded in the authorize URL and validated on callback.

expires_at: u64

When this challenge expires; the callback server reaps any challenge older than this.

Trait Implementations

impl Clone for Challenge

fn clone(&self) -> Challenge

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Challenge

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

Formats the value using the given formatter.