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lewis.moe
1use axum::{
2 Form, Json,
3 extract::State,
4 http::HeaderMap,
5};
6use chrono::{Duration, Utc};
7use serde::{Deserialize, Serialize};
8use crate::state::{AppState, RateLimitKind};
9use crate::oauth::{
10 AuthorizationRequestParameters, ClientAuth, OAuthError, RequestData, RequestId,
11 client::ClientMetadataCache,
12 db,
13};
14const PAR_EXPIRY_SECONDS: i64 = 600;
15const SUPPORTED_SCOPES: &[&str] = &["atproto", "transition:generic", "transition:chat.bsky"];
16#[derive(Debug, Deserialize)]
17pub struct ParRequest {
18 pub response_type: String,
19 pub client_id: String,
20 pub redirect_uri: String,
21 #[serde(default)]
22 pub scope: Option<String>,
23 #[serde(default)]
24 pub state: Option<String>,
25 #[serde(default)]
26 pub code_challenge: Option<String>,
27 #[serde(default)]
28 pub code_challenge_method: Option<String>,
29 #[serde(default)]
30 pub login_hint: Option<String>,
31 #[serde(default)]
32 pub dpop_jkt: Option<String>,
33 #[serde(default)]
34 pub client_secret: Option<String>,
35 #[serde(default)]
36 pub client_assertion: Option<String>,
37 #[serde(default)]
38 pub client_assertion_type: Option<String>,
39}
40#[derive(Debug, Serialize)]
41pub struct ParResponse {
42 pub request_uri: String,
43 pub expires_in: u64,
44}
45pub async fn pushed_authorization_request(
46 State(state): State<AppState>,
47 headers: HeaderMap,
48 Form(request): Form<ParRequest>,
49) -> Result<Json<ParResponse>, OAuthError> {
50 let client_ip = crate::rate_limit::extract_client_ip(&headers, None);
51 if !state.check_rate_limit(RateLimitKind::OAuthPar, &client_ip).await {
52 tracing::warn!(ip = %client_ip, "OAuth PAR rate limit exceeded");
53 return Err(OAuthError::RateLimited);
54 }
55 if request.response_type != "code" {
56 return Err(OAuthError::InvalidRequest(
57 "response_type must be 'code'".to_string(),
58 ));
59 }
60 let code_challenge = request.code_challenge.as_ref()
61 .filter(|s| !s.is_empty())
62 .ok_or_else(|| OAuthError::InvalidRequest(
63 "code_challenge is required".to_string(),
64 ))?;
65 let code_challenge_method = request.code_challenge_method.as_deref().unwrap_or("");
66 if code_challenge_method != "S256" {
67 return Err(OAuthError::InvalidRequest(
68 "code_challenge_method must be 'S256'".to_string(),
69 ));
70 }
71 let client_cache = ClientMetadataCache::new(3600);
72 let client_metadata = client_cache.get(&request.client_id).await?;
73 client_cache.validate_redirect_uri(&client_metadata, &request.redirect_uri)?;
74 let client_auth = determine_client_auth(&request)?;
75 if client_metadata.requires_dpop() && request.dpop_jkt.is_none() {
76 return Err(OAuthError::InvalidRequest(
77 "dpop_jkt is required for this client".to_string(),
78 ));
79 }
80 let validated_scope = validate_scope(&request.scope, &client_metadata)?;
81 let request_id = RequestId::generate();
82 let expires_at = Utc::now() + Duration::seconds(PAR_EXPIRY_SECONDS);
83 let parameters = AuthorizationRequestParameters {
84 response_type: request.response_type,
85 client_id: request.client_id.clone(),
86 redirect_uri: request.redirect_uri,
87 scope: validated_scope,
88 state: request.state,
89 code_challenge: code_challenge.clone(),
90 code_challenge_method: code_challenge_method.to_string(),
91 login_hint: request.login_hint,
92 dpop_jkt: request.dpop_jkt,
93 extra: None,
94 };
95 let request_data = RequestData {
96 client_id: request.client_id,
97 client_auth: Some(client_auth),
98 parameters,
99 expires_at,
100 did: None,
101 device_id: None,
102 code: None,
103 };
104 db::create_authorization_request(&state.db, &request_id.0, &request_data).await?;
105 tokio::spawn({
106 let pool = state.db.clone();
107 async move {
108 if let Err(e) = db::delete_expired_authorization_requests(&pool).await {
109 tracing::warn!("Failed to cleanup expired authorization requests: {:?}", e);
110 }
111 }
112 });
113 Ok(Json(ParResponse {
114 request_uri: request_id.0,
115 expires_in: PAR_EXPIRY_SECONDS as u64,
116 }))
117}
118fn determine_client_auth(request: &ParRequest) -> Result<ClientAuth, OAuthError> {
119 if let (Some(assertion), Some(assertion_type)) =
120 (&request.client_assertion, &request.client_assertion_type)
121 {
122 if assertion_type != "urn:ietf:params:oauth:client-assertion-type:jwt-bearer" {
123 return Err(OAuthError::InvalidRequest(
124 "Unsupported client_assertion_type".to_string(),
125 ));
126 }
127 return Ok(ClientAuth::PrivateKeyJwt {
128 client_assertion: assertion.clone(),
129 });
130 }
131 if let Some(secret) = &request.client_secret {
132 return Ok(ClientAuth::SecretPost {
133 client_secret: secret.clone(),
134 });
135 }
136 Ok(ClientAuth::None)
137}
138fn validate_scope(
139 requested_scope: &Option<String>,
140 client_metadata: &crate::oauth::client::ClientMetadata,
141) -> Result<Option<String>, OAuthError> {
142 let scope_str = match requested_scope {
143 Some(s) if !s.is_empty() => s,
144 _ => return Ok(Some("atproto".to_string())),
145 };
146 let requested_scopes: Vec<&str> = scope_str.split_whitespace().collect();
147 if requested_scopes.is_empty() {
148 return Ok(Some("atproto".to_string()));
149 }
150 for scope in &requested_scopes {
151 if !SUPPORTED_SCOPES.contains(scope) {
152 return Err(OAuthError::InvalidScope(format!(
153 "Unsupported scope: {}. Supported scopes: {}",
154 scope,
155 SUPPORTED_SCOPES.join(", ")
156 )));
157 }
158 }
159 if let Some(client_scope) = &client_metadata.scope {
160 let client_scopes: Vec<&str> = client_scope.split_whitespace().collect();
161 for scope in &requested_scopes {
162 if !client_scopes.contains(scope) {
163 return Err(OAuthError::InvalidScope(format!(
164 "Scope '{}' not registered for this client",
165 scope
166 )));
167 }
168 }
169 }
170 Ok(Some(requested_scopes.join(" ")))
171}