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A lexicon-driven AppView for ATProto.
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Rust
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use axum::extract::FromRequestParts;use axum::http::request::Parts;use sha2::{Digest, Sha256};
use crate::AppState;use crate::auth::middleware::Claims;use crate::db::{DatabaseBackend, adapt_sql, now_rfc3339};use crate::error::AppError;use crate::event_log::{EventLog, Severity, log_event};
use super::permissions::Permission;
pub struct UserAuth { pub did: String, pub user_id: String, pub is_super: bool, pub permissions: HashSet<Permission>, pub db: sqlx::AnyPool, pub db_backend: DatabaseBackend,}
impl UserAuth { pub async fn require(&self, permission: Permission) -> Result<(), AppError> { if self.is_super || self.permissions.contains(&permission) { Ok(()) } else { log_event( &self.db, EventLog { event_type: "auth.permission_denied".to_string(), severity: Severity::Warn, actor_did: Some(self.did.clone()), subject: Some(permission.as_str().to_string()), detail: serde_json::json!({ "user_id": self.user_id, "required_permission": permission.as_str(), }), }, self.db_backend, ) .await;
Err(AppError::InsufficientPermissions( permission.as_str().to_string(), )) } }
async fn load_permissions( db: &sqlx::AnyPool, user_id: &str, backend: DatabaseBackend, ) -> Result<HashSet<Permission>, AppError> { let sql = adapt_sql( "SELECT permission FROM happyview_user_permissions WHERE user_id = ?", backend, ); let rows: Vec<(String,)> = crate::db::query_as(&sql) .bind(user_id) .fetch_all(db) .await .map_err(|e| AppError::Internal(format!("permission query failed: {e}")))?;
let mut perms = HashSet::new(); for (perm_str,) in rows { if let Ok(p) = serde_json::from_value::<Permission>(serde_json::Value::String(perm_str)) { perms.insert(p); } } Ok(perms) }
async fn load_api_key_permissions( db: &sqlx::AnyPool, user_id: &str, key_permissions: &[String], backend: DatabaseBackend, ) -> Result<HashSet<Permission>, AppError> { let user_perms = Self::load_permissions(db, user_id, backend).await?; let mut effective = HashSet::new(); for perm_str in key_permissions { #[allow(clippy::collapsible_if)] if let Ok(p) = serde_json::from_value::<Permission>(serde_json::Value::String(perm_str.clone())) { if user_perms.contains(&p) { effective.insert(p); } } } Ok(effective) }}
impl FromRequestParts<AppState> for UserAuth { type Rejection = AppError;
async fn from_request_parts( parts: &mut Parts, state: &AppState, ) -> Result<Self, Self::Rejection> { if let Some(auth) = Self::try_api_key_auth(parts, state).await? { return Ok(auth); }
let claims = Claims::from_request_parts(parts, state).await?; let did = claims.did().to_string(); let backend = state.db_backend;
let count: (i64,) = crate::db::query_as("SELECT COUNT(*) FROM happyview_users") .fetch_one(&state.db) .await .map_err(|e| AppError::Internal(format!("user count query failed: {e}")))?;
if count.0 == 0 { // Bootstrap first user let id = uuid::Uuid::new_v4().to_string(); let now = now_rfc3339();
let insert_sql = adapt_sql( "INSERT INTO happyview_users (id, did, is_super, created_at) VALUES (?, ?, ?, ?)", backend, );
let result = crate::db::query(&insert_sql) .bind(&id) .bind(&did) .bind(1_i32) .bind(&now) .execute(&state.db) .await;
if result.is_ok() { let perm_sql = adapt_sql( "INSERT INTO happyview_user_permissions (user_id, permission, granted_at) VALUES (?, ?, ?)", backend, ); for perm in Permission::all() { let _ = crate::db::query(&perm_sql) .bind(&id) .bind(perm.as_str()) .bind(&now) .execute(&state.db) .await; }
tracing::info!(did = %did, "auto-bootstrapped first super user");
log_event( &state.db, EventLog { event_type: "user.bootstrapped".to_string(), severity: Severity::Info, actor_did: None, subject: Some(did.clone()), detail: serde_json::json!({}), }, backend, ) .await; } }
let select_sql = adapt_sql( "SELECT id, is_super FROM happyview_users WHERE did = ?", backend, ); let found: Option<(String, i32)> = crate::db::query_as(&select_sql) .bind(&did) .fetch_optional(&state.db) .await .map_err(|e| AppError::Internal(format!("user auth query failed: {e}")))?;
let Some((user_id, is_super_int)) = found else { return Err(AppError::Forbidden("not a user".into())); }; let is_super = is_super_int != 0;
let permissions = if is_super { HashSet::new() } else { Self::load_permissions(&state.db, &user_id, backend).await? };
let db = state.db.clone(); let uid = user_id.clone(); let now = now_rfc3339(); let update_sql = adapt_sql( "UPDATE happyview_users SET last_used_at = ? WHERE id = ?", backend, ); tokio::spawn(async move { let _ = crate::db::query(&update_sql) .bind(&now) .bind(&uid) .execute(&db) .await; });
Ok(UserAuth { did, user_id, is_super, permissions, db: state.db.clone(), db_backend: backend, }) }}
impl UserAuth { async fn try_api_key_auth(parts: &Parts, state: &AppState) -> Result<Option<Self>, AppError> { let header = match parts .headers .get("authorization") .and_then(|v| v.to_str().ok()) { Some(h) => h, None => return Ok(None), };
let token = header .strip_prefix("Bearer ") .or_else(|| header.strip_prefix("DPoP "));
let token = match token { Some(t) if t.starts_with("hv_") => t, _ => return Ok(None), };
let hash = hex::encode(Sha256::digest(token.as_bytes())); let backend = state.db_backend;
let select_sql = adapt_sql( "SELECT k.id, u.id, u.did, u.is_super, k.permissions FROM happyview_api_keys k JOIN happyview_users u ON u.id = k.user_id WHERE k.key_hash = ? AND k.revoked_at IS NULL", backend, );
let row: Option<(String, String, String, i32, String)> = crate::db::query_as(&select_sql) .bind(&hash) .fetch_optional(&state.db) .await .map_err(|e| AppError::Internal(format!("api key lookup failed: {e}")))?;
let Some((key_id, user_id, did, is_super_int, permissions_json)) = row else { return Err(AppError::Auth("invalid or revoked API key".into())); }; let is_super = is_super_int != 0;
// Parse permissions from JSON string (stored as JSON array) let key_permissions: Vec<String> = serde_json::from_str(&permissions_json).unwrap_or_default();
// An API key is bounded by its own stored permission list and never // carries super privileges — otherwise a super admin's "read-only" key // would grant full admin (H5). A super user implicitly holds every // permission, so their key's list is used as-is; a non-super user's key // is additionally intersected with what that user actually holds. let permissions = if is_super { parse_permissions(&key_permissions) } else { Self::load_api_key_permissions(&state.db, &user_id, &key_permissions, backend).await? };
let db = state.db.clone(); let now = now_rfc3339(); let update_sql = adapt_sql( "UPDATE happyview_api_keys SET last_used_at = ? WHERE id = ?", backend, ); tokio::spawn(async move { let _ = crate::db::query(&update_sql) .bind(&now) .bind(&key_id) .execute(&db) .await; });
Ok(Some(UserAuth { did, user_id, // A key is never super, regardless of its owner: `require()` must // consult the key's permissions, and super-only operations (user // management, transfer_super) stay unavailable via API keys. is_super: false, permissions, db: state.db.clone(), db_backend: backend, })) }}
/// Parse a stored key permission list (JSON strings) into a permission set,/// dropping any unrecognized entries. Used for super-user keys, whose owner/// implicitly holds every permission so no intersection is needed.fn parse_permissions(key_permissions: &[String]) -> HashSet<Permission> { key_permissions .iter() .filter_map(|s| { serde_json::from_value::<Permission>(serde_json::Value::String(s.clone())).ok() }) .collect()}