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A lexicon-driven AppView for ATProto.
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Rust
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use std::sync::Arc;
use crate::auth::OAuthClientRegistry;use crate::db::DatabaseBackend;use crate::error::AppError;use crate::plugin::encryption::decrypt;
use super::sessions::DpopSession;
/// Resolved DPoP credentials needed to make authenticated PDS requests.struct DpopCredentials { session: DpopSession, pds_url: String, private_jwk: serde_json::Value,}
/// Resolve DPoP credentials: session, PDS URL, and decrypted private key.async fn resolve_credentials( http: &reqwest::Client, pool: &sqlx::AnyPool, backend: DatabaseBackend, encryption_key: &[u8; 32], plc_url: &str, api_client_id: &str, user_did: &str,) -> Result<DpopCredentials, AppError> { let session = super::sessions::get_dpop_session(pool, backend, encryption_key, api_client_id, user_did) .await?;
let pds_url = match session.pds_url { Some(ref url) => url.clone(), None => resolve_pds_from_did(http, plc_url, user_did).await?, };
let key_sql = crate::db::adapt_sql( "SELECT private_key_enc FROM dpop_keys WHERE id = ?", backend, ); let row: Option<(Vec<u8>,)> = sqlx::query_as(&key_sql) .bind(&session.dpop_key_id) .fetch_optional(pool) .await .map_err(|e| AppError::Internal(format!("failed to look up DPoP key: {e}")))?;
let (encrypted_key,) = row.ok_or_else(|| AppError::Internal("DPoP key not found".into()))?;
let key_bytes = decrypt(encryption_key, &encrypted_key) .map_err(|e| AppError::Internal(format!("failed to decrypt DPoP key: {e}")))?;
let private_jwk: serde_json::Value = serde_json::from_slice(&key_bytes) .map_err(|e| AppError::Internal(format!("failed to parse DPoP key: {e}")))?;
Ok(DpopCredentials { session, pds_url, private_jwk, })}
/// Make an authenticated POST, handling DPoP nonce negotiation and token refresh.#[allow(clippy::too_many_arguments)]async fn dpop_post_with_retry( http: &reqwest::Client, pool: &sqlx::AnyPool, backend: DatabaseBackend, encryption_key: &[u8; 32], oauth_registry: &Arc<OAuthClientRegistry>, creds: &mut DpopCredentials, target_url: &str, request_builder: impl Fn(&reqwest::Client, &str, &str) -> reqwest::RequestBuilder,) -> Result<reqwest::Response, AppError> { let proof = generate_dpop_proof( &creds.private_jwk, "POST", target_url, &creds.session.access_token, None, )?;
let resp = request_builder(http, &creds.session.access_token, &proof) .send() .await .map_err(|e| AppError::Internal(format!("PDS request failed: {e}")))?;
// Handle DPoP nonce requirement if let Some(nonce) = extract_dpop_nonce(&resp) { let proof = generate_dpop_proof( &creds.private_jwk, "POST", target_url, &creds.session.access_token, Some(&nonce), )?;
let resp = request_builder(http, &creds.session.access_token, &proof) .send() .await .map_err(|e| AppError::Internal(format!("PDS request failed: {e}")))?;
// If we still get invalid_token after nonce, try refresh if is_expired_token(&resp) { return retry_after_refresh( http, pool, backend, encryption_key, oauth_registry, creds, target_url, Some(&nonce), &request_builder, ) .await; }
return Ok(resp); }
// Handle expired token if is_expired_token(&resp) { return retry_after_refresh( http, pool, backend, encryption_key, oauth_registry, creds, target_url, None, &request_builder, ) .await; }
Ok(resp)}
/// Refresh the access token and retry the PDS request.////// If the refresh fails with `invalid_grant`, re-reads the session from the/// database — a concurrent request may have already refreshed the token.#[allow(clippy::too_many_arguments)]async fn retry_after_refresh( http: &reqwest::Client, pool: &sqlx::AnyPool, backend: DatabaseBackend, encryption_key: &[u8; 32], oauth_registry: &Arc<OAuthClientRegistry>, creds: &mut DpopCredentials, target_url: &str, nonce: Option<&str>, request_builder: &impl Fn(&reqwest::Client, &str, &str) -> reqwest::RequestBuilder,) -> Result<reqwest::Response, AppError> { let stale_access_token = creds.session.access_token.clone();
if let Err(e) = refresh_access_token(http, pool, backend, encryption_key, oauth_registry, creds).await { // If the refresh token was rejected, check whether a concurrent request // already refreshed the session. Re-read from the database and compare // the access token — if it changed, another refresh succeeded. if is_invalid_grant_error(&e) { let fresh_session = super::sessions::get_dpop_session( pool, backend, encryption_key, &creds.session.api_client_id, &creds.session.user_did, ) .await?;
if fresh_session.access_token != stale_access_token { tracing::info!( user_did = %creds.session.user_did, api_client_id = %creds.session.api_client_id, "concurrent refresh detected, using updated token" ); creds.session = fresh_session; } else { return Err(e); } } else { return Err(e); } }
let proof = generate_dpop_proof( &creds.private_jwk, "POST", target_url, &creds.session.access_token, nonce, )?;
let resp = request_builder(http, &creds.session.access_token, &proof) .send() .await .map_err(|e| AppError::Internal(format!("PDS request failed after token refresh: {e}")))?;
// One more nonce negotiation attempt after refresh if let Some(new_nonce) = extract_dpop_nonce(&resp) { let proof = generate_dpop_proof( &creds.private_jwk, "POST", target_url, &creds.session.access_token, Some(&new_nonce), )?;
let resp = request_builder(http, &creds.session.access_token, &proof) .send() .await .map_err(|e| AppError::Internal(format!("PDS request failed: {e}")))?;
return Ok(resp); }
Ok(resp)}
fn is_invalid_grant_error(e: &AppError) -> bool { matches!(e, AppError::Auth(msg) if msg.contains("invalid_grant"))}
/// Make an authenticated POST to a PDS XRPC endpoint using a DPoP session.#[allow(clippy::too_many_arguments)]pub async fn dpop_pds_post( http: &reqwest::Client, pool: &sqlx::AnyPool, backend: DatabaseBackend, encryption_key: &[u8; 32], oauth_registry: &Arc<OAuthClientRegistry>, plc_url: &str, api_client_id: &str, user_did: &str, xrpc_method: &str, body: &serde_json::Value,) -> Result<reqwest::Response, AppError> { let mut creds = resolve_credentials( http, pool, backend, encryption_key, plc_url, api_client_id, user_did, ) .await?;
let target_url = format!( "{}/xrpc/{}", creds.pds_url.trim_end_matches('/'), xrpc_method );
let body = body.clone(); let target = target_url.clone(); dpop_post_with_retry( http, pool, backend, encryption_key, oauth_registry, &mut creds, &target_url, |http, access_token, proof| { http.post(&target) .header("Authorization", format!("DPoP {access_token}")) .header("DPoP", proof) .header("Content-Type", "application/json") .json(&body) }, ) .await}
/// Make an authenticated blob upload to a PDS using a DPoP session.#[allow(clippy::too_many_arguments)]pub async fn dpop_pds_post_blob( http: &reqwest::Client, pool: &sqlx::AnyPool, backend: DatabaseBackend, encryption_key: &[u8; 32], oauth_registry: &Arc<OAuthClientRegistry>, plc_url: &str, api_client_id: &str, user_did: &str, content_type: &str, blob: bytes::Bytes,) -> Result<reqwest::Response, AppError> { let mut creds = resolve_credentials( http, pool, backend, encryption_key, plc_url, api_client_id, user_did, ) .await?;
let target_url = format!( "{}/xrpc/com.atproto.repo.uploadBlob", creds.pds_url.trim_end_matches('/') );
let content_type = content_type.to_string(); let target = target_url.clone(); dpop_post_with_retry( http, pool, backend, encryption_key, oauth_registry, &mut creds, &target_url, |http, access_token, proof| { http.post(&target) .header("Authorization", format!("DPoP {access_token}")) .header("DPoP", proof) .header("Content-Type", &content_type) .body(blob.clone()) }, ) .await}
/// Check if a response is a 401 with an expired/invalid token error.fn is_expired_token(resp: &reqwest::Response) -> bool { resp.status() == reqwest::StatusCode::UNAUTHORIZED}
/// Check if a response indicates that a DPoP nonce is required, and extract it.fn extract_dpop_nonce(resp: &reqwest::Response) -> Option<String> { if resp.status() == reqwest::StatusCode::UNAUTHORIZED || resp.status() == reqwest::StatusCode::BAD_REQUEST { resp.headers() .get("dpop-nonce") .and_then(|v| v.to_str().ok()) .map(|s| s.to_string()) } else { None }}
/// Refresh an expired access token using the session's refresh_token.////// Discovers the token endpoint from the issuer's OAuth metadata, sends a/// `grant_type=refresh_token` request with a DPoP proof, and updates the/// stored session with the new tokens.////// Unlike PDS resource endpoints, the token endpoint response body is read/// before deciding whether a `dpop-nonce` header indicates a retry — this/// avoids misinterpreting `invalid_grant` as a nonce requirement when the/// PDS includes `dpop-nonce` on all error responses.async fn refresh_access_token( http: &reqwest::Client, pool: &sqlx::AnyPool, backend: DatabaseBackend, encryption_key: &[u8; 32], oauth_registry: &Arc<OAuthClientRegistry>, creds: &mut DpopCredentials,) -> Result<(), AppError> { let refresh_token = creds .session .refresh_token .as_deref() .ok_or_else(|| AppError::Auth("token expired and no refresh_token available".into()))?;
let issuer = creds .session .issuer .as_deref() .ok_or_else(|| AppError::Auth("token expired and no issuer URL stored".into()))?;
let token_endpoint = discover_token_endpoint(http, issuer).await?;
// Get the resolved client_id from the OAuth registry. For loopback clients // this returns `http://localhost?scope=...` which auth servers handle inline, // rather than the `client_id_url` from the DB which they'd try to fetch. let client_id_url = lookup_client_id_url(pool, backend, &creds.session.api_client_id).await?; let client_id = oauth_registry .get_resolved_client_id(&client_id_url) .unwrap_or(client_id_url);
let proof = generate_dpop_proof_no_ath(&creds.private_jwk, "POST", &token_endpoint, None)?;
let resp = http .post(&token_endpoint) .header("DPoP", &proof) .header("Content-Type", "application/x-www-form-urlencoded") .form(&[ ("grant_type", "refresh_token"), ("refresh_token", refresh_token), ("client_id", &client_id), ]) .send() .await .map_err(|e| AppError::Internal(format!("token refresh request failed: {e}")))?;
let status = resp.status(); let dpop_nonce = resp .headers() .get("dpop-nonce") .and_then(|v| v.to_str().ok()) .map(|s| s.to_string()); let body = resp.text().await.unwrap_or_default();
if status.is_success() { return apply_refresh_response(pool, backend, encryption_key, creds, &body).await; }
// Only retry with a nonce if the error is actually `use_dpop_nonce`. // PDS implementations include `dpop-nonce` on all responses, so checking // the header alone would misinterpret `invalid_grant` as a nonce issue. if let Some(nonce) = dpop_nonce && is_use_dpop_nonce_error(&body) { let proof = generate_dpop_proof_no_ath(&creds.private_jwk, "POST", &token_endpoint, Some(&nonce))?;
let retry_resp = http .post(&token_endpoint) .header("DPoP", &proof) .header("Content-Type", "application/x-www-form-urlencoded") .form(&[ ("grant_type", "refresh_token"), ("refresh_token", refresh_token), ("client_id", &client_id), ]) .send() .await .map_err(|e| AppError::Internal(format!("token refresh request failed: {e}")))?;
let retry_status = retry_resp.status(); let retry_body = retry_resp.text().await.unwrap_or_default();
if !retry_status.is_success() { return Err(AppError::Auth(format!( "token refresh failed ({retry_status}): {retry_body}" ))); }
return apply_refresh_response(pool, backend, encryption_key, creds, &retry_body).await; }
Err(AppError::Auth(format!( "token refresh failed ({status}): {body}" )))}
/// Check if a token endpoint error body indicates a `use_dpop_nonce` error.fn is_use_dpop_nonce_error(body: &str) -> bool { serde_json::from_str::<serde_json::Value>(body) .ok() .and_then(|v| v["error"].as_str().map(|s| s == "use_dpop_nonce")) .unwrap_or(false)}
/// Parse a successful token refresh response body and update the stored session.async fn apply_refresh_response( pool: &sqlx::AnyPool, backend: DatabaseBackend, encryption_key: &[u8; 32], creds: &mut DpopCredentials, body: &str,) -> Result<(), AppError> { let token_resp: serde_json::Value = serde_json::from_str(body) .map_err(|e| AppError::Internal(format!("invalid token refresh response: {e}")))?;
let new_access_token = token_resp["access_token"] .as_str() .ok_or_else(|| AppError::Internal("refresh response missing access_token".into()))?;
let new_refresh_token = token_resp["refresh_token"].as_str();
let expires_in = token_resp["expires_in"].as_u64(); let new_expires_at = expires_in .map(|secs| (chrono::Utc::now() + chrono::Duration::seconds(secs as i64)).to_rfc3339());
// Update the stored session super::sessions::store_dpop_session( pool, backend, encryption_key, &creds.session.id, &creds.session.api_client_id, &creds.session.dpop_key_id, &creds.session.user_did, new_access_token, new_refresh_token.or(creds.session.refresh_token.as_deref()), new_expires_at .as_deref() .or(creds.session.token_expires_at.as_deref()), &creds.session.scopes, creds.session.pds_url.as_deref(), creds.session.issuer.as_deref(), ) .await?;
// Update the in-memory credentials creds.session.access_token = new_access_token.to_string(); if let Some(rt) = new_refresh_token { creds.session.refresh_token = Some(rt.to_string()); } if let Some(ref exp) = new_expires_at { creds.session.token_expires_at = Some(exp.clone()); }
tracing::info!( user_did = %creds.session.user_did, api_client_id = %creds.session.api_client_id, "refreshed DPoP access token" );
Ok(())}
/// Discover the token endpoint from an OAuth authorization server's metadata.async fn discover_token_endpoint(http: &reqwest::Client, issuer: &str) -> Result<String, AppError> { let metadata_url = format!( "{}/.well-known/oauth-authorization-server", issuer.trim_end_matches('/') );
let resp = http.get(&metadata_url).send().await.map_err(|e| { AppError::Internal(format!("failed to fetch auth server metadata: {e}")) })?;
if !resp.status().is_success() { return Err(AppError::Internal(format!( "auth server metadata returned {}", resp.status() ))); }
let metadata: serde_json::Value = resp .json() .await .map_err(|e| AppError::Internal(format!("invalid auth server metadata: {e}")))?;
metadata["token_endpoint"] .as_str() .map(|s| s.to_string()) .ok_or_else(|| AppError::Internal("auth server metadata missing token_endpoint".into()))}
/// Look up the client_id_url for an API client by its internal ID.async fn lookup_client_id_url( pool: &sqlx::AnyPool, backend: DatabaseBackend, api_client_id: &str,) -> Result<String, AppError> { let sql = crate::db::adapt_sql( "SELECT client_id_url FROM api_clients WHERE id = ?", backend, ); let row: Option<(String,)> = sqlx::query_as(&sql) .bind(api_client_id) .fetch_optional(pool) .await .map_err(|e| AppError::Internal(format!("failed to look up API client: {e}")))?;
row.map(|(url,)| url) .ok_or_else(|| AppError::Internal("API client not found".into()))}
/// Generate a DPoP proof JWT for a PDS request.pub fn generate_dpop_proof( private_jwk: &serde_json::Value, method: &str, url: &str, access_token: &str, nonce: Option<&str>,) -> Result<String, AppError> { let ath = URL_SAFE_NO_PAD.encode(Sha256::digest(access_token.as_bytes())); generate_dpop_proof_inner(private_jwk, method, url, Some(&ath), nonce)}
/// Generate a DPoP proof JWT without an `ath` claim (for token endpoint requests).fn generate_dpop_proof_no_ath( private_jwk: &serde_json::Value, method: &str, url: &str, nonce: Option<&str>,) -> Result<String, AppError> { generate_dpop_proof_inner(private_jwk, method, url, None, nonce)}
fn generate_dpop_proof_inner( private_jwk: &serde_json::Value, method: &str, url: &str, ath: Option<&str>, nonce: Option<&str>,) -> Result<String, AppError> { let d_b64 = private_jwk["d"] .as_str() .ok_or_else(|| AppError::Internal("DPoP key missing d parameter".into()))?; let x_b64 = private_jwk["x"] .as_str() .ok_or_else(|| AppError::Internal("DPoP key missing x parameter".into()))?; let y_b64 = private_jwk["y"] .as_str() .ok_or_else(|| AppError::Internal("DPoP key missing y parameter".into()))?;
let d_bytes = URL_SAFE_NO_PAD .decode(d_b64) .map_err(|_| AppError::Internal("invalid DPoP key d parameter".into()))?;
let signing_key = SigningKey::from_bytes((&d_bytes[..]).into()) .map_err(|e| AppError::Internal(format!("invalid DPoP signing key: {e}")))?;
let public_jwk = serde_json::json!({ "kty": "EC", "crv": "P-256", "x": x_b64, "y": y_b64, });
let now = std::time::SystemTime::now() .duration_since(std::time::UNIX_EPOCH) .unwrap() .as_secs();
let header = serde_json::json!({ "alg": "ES256", "typ": "dpop+jwt", "jwk": public_jwk, });
let mut payload = serde_json::json!({ "htm": method, "htu": url, "iat": now, "jti": format!("{:x}", rand::random::<u64>()), }); if let Some(ath) = ath { payload["ath"] = serde_json::json!(ath); } if let Some(nonce) = nonce { payload["nonce"] = serde_json::json!(nonce); }
let header_b64 = URL_SAFE_NO_PAD.encode(serde_json::to_vec(&header).unwrap()); let payload_b64 = URL_SAFE_NO_PAD.encode(serde_json::to_vec(&payload).unwrap());
let message = format!("{}.{}", header_b64, payload_b64); let signature: p256::ecdsa::Signature = signing_key.sign(message.as_bytes()); let sig_b64 = URL_SAFE_NO_PAD.encode(signature.to_bytes());
Ok(format!("{}.{}.{}", header_b64, payload_b64, sig_b64))}
/// Resolve a user's PDS URL from their DID document.async fn resolve_pds_from_did( http: &reqwest::Client, plc_url: &str, did: &str,) -> Result<String, AppError> { let url = if did.starts_with("did:plc:") { format!("{}/{}", plc_url.trim_end_matches('/'), did) } else if did.starts_with("did:web:") { let host = did.strip_prefix("did:web:").unwrap(); format!("https://{}/.well-known/did.json", host) } else { return Err(AppError::Internal(format!("unsupported DID method: {did}"))); };
let resp = http .get(&url) .send() .await .map_err(|e| AppError::Internal(format!("failed to resolve DID: {e}")))?;
let doc: serde_json::Value = resp .json() .await .map_err(|e| AppError::Internal(format!("failed to parse DID document: {e}")))?;
let services = doc["service"] .as_array() .ok_or_else(|| AppError::Internal("DID document missing service array".into()))?;
for service in services { let id = service["id"].as_str().unwrap_or(""); if (id == "#atproto_pds" || id.ends_with("#atproto_pds")) && let Some(endpoint) = service["serviceEndpoint"].as_str() { return Ok(endpoint.to_string()); } }
Err(AppError::Internal(format!( "no #atproto_pds service found in DID document for {did}" )))}
#[cfg(test)]mod tests { use super::*;
#[test] fn generate_dpop_proof_produces_valid_jwt() { let keypair = super::super::keys::generate_dpop_keypair().unwrap();
let proof = generate_dpop_proof( &keypair.private_jwk, "POST", "https://pds.example.com/xrpc/com.atproto.repo.createRecord", "test-access-token", None, ) .unwrap();
let parts: Vec<&str> = proof.split('.').collect(); assert_eq!(parts.len(), 3);
let header_bytes = URL_SAFE_NO_PAD.decode(parts[0]).unwrap(); let header: serde_json::Value = serde_json::from_slice(&header_bytes).unwrap(); assert_eq!(header["alg"], "ES256"); assert_eq!(header["typ"], "dpop+jwt"); assert_eq!(header["jwk"]["kty"], "EC");
let payload_bytes = URL_SAFE_NO_PAD.decode(parts[1]).unwrap(); let payload: serde_json::Value = serde_json::from_slice(&payload_bytes).unwrap(); assert_eq!(payload["htm"], "POST"); assert_eq!( payload["htu"], "https://pds.example.com/xrpc/com.atproto.repo.createRecord" ); assert!(payload["iat"].is_number()); assert!(payload["ath"].is_string()); assert!(payload["jti"].is_string()); }
#[test] fn generate_dpop_proof_includes_nonce() { let keypair = super::super::keys::generate_dpop_keypair().unwrap();
let proof = generate_dpop_proof( &keypair.private_jwk, "POST", "https://pds.example.com/xrpc/test", "token", Some("server-nonce-123"), ) .unwrap();
let parts: Vec<&str> = proof.split('.').collect(); let payload_bytes = URL_SAFE_NO_PAD.decode(parts[1]).unwrap(); let payload: serde_json::Value = serde_json::from_slice(&payload_bytes).unwrap(); assert_eq!(payload["nonce"], "server-nonce-123"); }
#[test] fn generate_dpop_proof_no_ath_omits_ath() { let keypair = super::super::keys::generate_dpop_keypair().unwrap();
let proof = generate_dpop_proof_no_ath( &keypair.private_jwk, "POST", "https://auth.example.com/oauth/token", None, ) .unwrap();
let parts: Vec<&str> = proof.split('.').collect(); let payload_bytes = URL_SAFE_NO_PAD.decode(parts[1]).unwrap(); let payload: serde_json::Value = serde_json::from_slice(&payload_bytes).unwrap(); assert!(payload.get("ath").is_none()); assert!(payload["htm"].is_string()); assert!(payload["htu"].is_string()); }
#[test] fn generated_proof_validates_against_own_key() { let keypair = super::super::keys::generate_dpop_keypair().unwrap(); let url = "https://pds.example.com/xrpc/test.method"; let token = "my-access-token";
let proof = generate_dpop_proof(&keypair.private_jwk, "POST", url, token, None).unwrap();
let result = super::super::dpop_proof::validate_dpop_proof( &proof, "POST", url, token, &keypair.thumbprint, ); assert!(result.is_ok(), "validation failed: {:?}", result.err()); }
#[test] fn is_use_dpop_nonce_error_detects_nonce_error() { assert!(is_use_dpop_nonce_error(r#"{"error":"use_dpop_nonce"}"#)); }
#[test] fn is_use_dpop_nonce_error_rejects_invalid_grant() { assert!(!is_use_dpop_nonce_error( r#"{"error":"invalid_grant","error_description":"Invalid refresh token"}"# )); }
#[test] fn is_use_dpop_nonce_error_rejects_garbage() { assert!(!is_use_dpop_nonce_error("not json")); assert!(!is_use_dpop_nonce_error("")); assert!(!is_use_dpop_nonce_error("{}")); }
#[test] fn is_invalid_grant_error_matches() { let e = AppError::Auth("token refresh failed (400 Bad Request): {\"error\":\"invalid_grant\",\"error_description\":\"Invalid refresh token\"}".into()); assert!(is_invalid_grant_error(&e)); }
#[test] fn is_invalid_grant_error_ignores_other_errors() { assert!(!is_invalid_grant_error(&AppError::Auth( "token expired".into() ))); assert!(!is_invalid_grant_error(&AppError::Internal( "something broke".into() ))); }}