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use crate::domain::models::*;
/// Specification pattern for encapsulating business rules
pub trait Specification<T> {
fn is_satisfied_by(&self, candidate: &T) -> bool;
fn reason_for_failure(&self, candidate: &T) -> Option<String>;
}
/// Composite specifications
pub struct AndSpecification<T> {
left: Box<dyn Specification<T>>,
right: Box<dyn Specification<T>>,
}
impl<T> AndSpecification<T> {
pub fn new(left: Box<dyn Specification<T>>, right: Box<dyn Specification<T>>) -> Self {
Self { left, right }
}
}
impl<T> Specification<T> for AndSpecification<T> {
fn is_satisfied_by(&self, candidate: &T) -> bool {
self.left.is_satisfied_by(candidate) && self.right.is_satisfied_by(candidate)
}
fn reason_for_failure(&self, candidate: &T) -> Option<String> {
if !self.left.is_satisfied_by(candidate) {
self.left.reason_for_failure(candidate)
} else if !self.right.is_satisfied_by(candidate) {
self.right.reason_for_failure(candidate)
} else {
None
}
}
}
/// OAuth2 Client Specifications
pub struct ActiveClientSpecification;
impl Specification<OAuthClient> for ActiveClientSpecification {
fn is_satisfied_by(&self, client: &OAuthClient) -> bool {
client.is_active
}
fn reason_for_failure(&self, _client: &OAuthClient) -> Option<String> {
Some("Client is not active".to_string())
}
}
pub struct ValidRedirectUriSpecification {
redirect_uri: String,
}
impl ValidRedirectUriSpecification {
pub fn new(redirect_uri: String) -> Self {
Self { redirect_uri }
}
}
impl Specification<OAuthClient> for ValidRedirectUriSpecification {
fn is_satisfied_by(&self, client: &OAuthClient) -> bool {
client.redirect_uris.contains(&self.redirect_uri)
}
fn reason_for_failure(&self, _client: &OAuthClient) -> Option<String> {
Some(format!("Invalid redirect_uri: {}", self.redirect_uri))
}
}
pub struct SupportedScopesSpecification {
requested_scopes: Vec<String>,
}
impl SupportedScopesSpecification {
pub fn new(requested_scopes: Vec<String>) -> Self {
Self { requested_scopes }
}
}
impl Specification<OAuthClient> for SupportedScopesSpecification {
fn is_satisfied_by(&self, client: &OAuthClient) -> bool {
self.requested_scopes.iter().all(|scope| client.scopes.contains(scope))
}
fn reason_for_failure(&self, client: &OAuthClient) -> Option<String> {
let unsupported: Vec<_> = self.requested_scopes.iter()
.filter(|scope| !client.scopes.contains(scope))
.cloned()
.collect();
if !unsupported.is_empty() {
Some(format!("Unsupported scopes: {}", unsupported.join(", ")))
} else {
None
}
}
}
/// Authorization Code Specifications
pub struct UnusedAuthCodeSpecification;
impl Specification<AuthorizationCode> for UnusedAuthCodeSpecification {
fn is_satisfied_by(&self, code: &AuthorizationCode) -> bool {
!code.is_used
}
fn reason_for_failure(&self, _code: &AuthorizationCode) -> Option<String> {
Some("Authorization code has already been used".to_string())
}
}
pub struct ValidAuthCodeSpecification;
impl Specification<AuthorizationCode> for ValidAuthCodeSpecification {
fn is_satisfied_by(&self, code: &AuthorizationCode) -> bool {
chrono::Utc::now() < code.expires_at
}
fn reason_for_failure(&self, _code: &AuthorizationCode) -> Option<String> {
Some("Authorization code has expired".to_string())
}
}
pub struct MatchingClientSpecification {
client_id: String,
}
impl MatchingClientSpecification {
pub fn new(client_id: String) -> Self {
Self { client_id }
}
}
impl Specification<AuthorizationCode> for MatchingClientSpecification {
fn is_satisfied_by(&self, code: &AuthorizationCode) -> bool {
code.client_id == self.client_id
}
fn reason_for_failure(&self, _code: &AuthorizationCode) -> Option<String> {
Some("Client ID mismatch".to_string())
}
}
/// PKCE Specifications
pub struct ValidPkceSpecification {
code_verifier: String,
}
impl ValidPkceSpecification {
pub fn new(code_verifier: String) -> Self {
Self { code_verifier }
}
}
impl Specification<AuthorizationCode> for ValidPkceSpecification {
fn is_satisfied_by(&self, code: &AuthorizationCode) -> bool {
if let Some(challenge) = &code.code_challenge {
let method = code.code_challenge_method.as_deref().unwrap_or("plain");
crate::oauth::pkce::verify_code_challenge(&self.code_verifier, challenge,
&crate::oauth::pkce::CodeChallengeMethod::from_str(method).unwrap_or(crate::oauth::pkce::CodeChallengeMethod::Plain)
).is_ok()
} else {
true // No PKCE required
}
}
fn reason_for_failure(&self, _code: &AuthorizationCode) -> Option<String> {
Some("PKCE verification failed".to_string())
}
}
/// Access Token Specifications
pub struct ValidTokenSpecification;
impl Specification<AccessToken> for ValidTokenSpecification {
fn is_satisfied_by(&self, token: &AccessToken) -> bool {
!token.is_revoked && chrono::Utc::now() < token.expires_at
}
fn reason_for_failure(&self, token: &AccessToken) -> Option<String> {
if token.is_revoked {
Some("Token has been revoked".to_string())
} else if chrono::Utc::now() >= token.expires_at {
Some("Token has expired".to_string())
} else {
None
}
}
}
/// Helper trait for chaining specifications
pub trait SpecificationExt<T>: Specification<T> + Sized + 'static {
fn and(self, other: impl Specification<T> + 'static) -> AndSpecification<T> {
AndSpecification::new(Box::new(self), Box::new(other))
}
}
impl<T, S: Specification<T> + 'static> SpecificationExt<T> for S {}
|
