fraiseql_core/security/

security_context.rs

//! Security context for runtime authorization
//!
//! This module provides the `SecurityContext` struct that flows through the executor,
//! carrying information about the authenticated user and their permissions.
//!
//! The security context is extracted from:
//! - JWT claims (`user_id` from 'sub', roles from 'roles', etc.)
//! - HTTP headers (`request_id`, `tenant_id`, etc.)
//! - Configuration (OAuth provider, scopes, etc.)
//!
//! # Architecture
//!
//! ```text
//! HTTP Request with Authorization header
//!     ↓
//! AuthMiddleware → AuthenticatedUser
//!     ↓
//! SecurityContext (created from AuthenticatedUser + request metadata)
//!     ↓
//! Executor (with context available for RLS policy evaluation)
//! ```
//!
//! # RLS Integration
//!
//! The `SecurityContext` is passed to `RLSPolicy::evaluate()` to determine what
//! rows a user can access. Policies are compiled into schema.compiled.json
//! and evaluated at runtime with the `SecurityContext`.

use std::collections::HashMap;

use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use uuid::Uuid;

use crate::{
    security::{ActorType, AuthenticatedUser, derive_actor},
    types::{TenantId, UserId},
};

/// Extract the user's roles from the (signature-verified) JWT custom claims.
///
/// Reads, in order, the scalar `role` claim, the `roles` array, and the
/// `fraiseql_roles` array, then sorts and de-duplicates. This mirrors the
/// claim names honoured by `fraiseql_auth::operation_rbac` so the GraphQL
/// `requires_role` gate and the observer-admin RBAC engine agree on what a
/// token grants. Without this, `SecurityContext.roles` was always empty and
/// every `requires_role` operation was unreachable over HTTP (#503).
fn roles_from_claims(extra_claims: &HashMap<String, serde_json::Value>) -> Vec<String> {
    let mut roles = Vec::new();

    if let Some(serde_json::Value::String(role)) = extra_claims.get("role") {
        roles.push(role.clone());
    }

    for key in ["roles", "fraiseql_roles"] {
        if let Some(serde_json::Value::Array(values)) = extra_claims.get(key) {
            roles.extend(values.iter().filter_map(|v| match v {
                serde_json::Value::String(role) => Some(role.clone()),
                _ => None,
            }));
        }
    }

    roles.sort();
    roles.dedup();
    roles
}

/// What a transport should do after an enrichment attempt (#1336).
///
/// Lives here rather than in `fraiseql-server` because a third crate needs it:
/// `fraiseql-arrow`'s Flight transport resolves through the [`IdentityEnricher`] seam
/// below and must answer a denial exactly as the other six transports do (#1349).
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum EnrichmentOutcome {
    /// Identity resolved and merged — continue to dispatch.
    Proceed,
    /// Permanent denial — fail closed (403 / `PERMISSION_DENIED`) before any data query.
    Denied,
    /// Transient resolver failure — fail the request (503 / `UNAVAILABLE`), never fall
    /// through to an unscoped query.
    Unavailable,
}

impl EnrichmentOutcome {
    /// The outward body for a denial. Generic by design: the precise reason is logged
    /// server-side, never surfaced, so the response cannot be used as an actor-table
    /// existence oracle. One constant rather than a literal per transport, because a
    /// transport that phrased it differently would leak the difference between "unknown
    /// subject" and "denied subject".
    pub const DENIED_MESSAGE: &'static str = "Access denied";
    /// The outward body for a transient resolver failure — distinct from a denial,
    /// because a client may retry this one and must not retry the other.
    pub const UNAVAILABLE_MESSAGE: &'static str = "Identity resolution temporarily unavailable";
}

/// An owned, `Send` boxed future — the object-safe async return used instead of a new
/// `async_trait`, keeping the dyn-dispatch ratchet flat (ADR-0016 §2.2).
pub type BoxFuture<'a, T> = std::pin::Pin<Box<dyn std::future::Future<Output = T> + Send + 'a>>;

/// Resolve a request subject's database identity and merge it into the context (#1349).
///
/// The implementation lives in `fraiseql-server` — it needs `sqlx` and the unscoped
/// enrichment pool — so this is the seam a crate that cannot depend on the server calls.
/// It exists for exactly one caller today: `fraiseql-arrow`'s Flight handlers, which
/// build their own principal and had no way to resolve it.
///
/// Transports inside `fraiseql-server` call `identity::resolve_request_identity`
/// directly rather than through this trait; both run the same resolver, so a denial
/// means the same thing on every door.
pub trait IdentityEnricher: Send + Sync {
    /// Resolve `ctx`'s identity, merging the resolved fields on success.
    ///
    /// All-or-nothing: on a denial or a transient failure nothing is merged and the
    /// caller must stop the request. On success the context is marked
    /// [`EnrichmentMark::Resolved`], which is what keeps the engine's backstop from
    /// refusing it downstream.
    fn enrich<'a>(&'a self, ctx: &'a mut SecurityContext) -> BoxFuture<'a, EnrichmentOutcome>;
}

/// How a principal satisfied the enrichment requirement (#1336).
///
/// The contract `[identity.enrichment]` documents is "every authenticated
/// request resolves and fail-closes". Enforcing it needs the engine to tell an
/// *enriched* principal from one that never met a resolver — and the transports
/// that produce principals are not all in one crate, so the answer rides on the
/// context rather than on a per-deployment flag the producer might not see.
///
/// There is deliberately **no** `NotResolved` variant: the absence of a mark is
/// that state. A variant would be settable, and anything settable eventually
/// gets set by the code path that should have refused.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum EnrichmentMark {
    /// The resolver ran and the identity resolved — or the principal already
    /// carried server-injected `fraiseql.enriched.*` fields, which stand in lieu
    /// of a resolve (ADR-0018 decision 5).
    Resolved,
    /// A principal with no subject to resolve: the server acting as itself
    /// (`system_job`). Set at exactly one construction site, never as a fallback
    /// for "no resolver was available" — that case must fail closed.
    Exempt,
}

impl EnrichmentMark {
    const EXEMPT: &'static str = "exempt";
    const RESOLVED: &'static str = "resolved";

    /// The wire token stored in the context attribute.
    #[must_use]
    pub const fn as_str(self) -> &'static str {
        match self {
            Self::Resolved => Self::RESOLVED,
            Self::Exempt => Self::EXEMPT,
        }
    }
}

/// Security context for authorization evaluation.
///
/// Carries information about the authenticated user and their permissions
/// throughout the request lifecycle.
///
/// # Fields
///
/// - `user_id`: Unique identifier for the authenticated user (from JWT 'sub' claim)
/// - `roles`: User's roles (e.g., `["admin", "moderator"]`, from JWT 'roles' claim)
/// - `tenant_id`: Organization/tenant identifier for multi-tenant systems
/// - `scopes`: OAuth/permission scopes (e.g., `["read:user", "write:post"]`)
/// - `attributes`: Custom claims from JWT (e.g., department, region, tier)
/// - `request_id`: Correlation ID for audit logging and tracing
/// - `ip_address`: Client IP address for geolocation and fraud detection
/// - `authenticated_at`: When the JWT was issued
/// - `expires_at`: When the JWT expires
/// - `issuer`: Token issuer for multi-issuer systems
/// - `audience`: Token audience for validation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecurityContext {
    /// User ID (from JWT 'sub' claim)
    pub user_id: UserId,

    /// User's roles (e.g., `["admin", "moderator"]`)
    ///
    /// Extracted from JWT 'roles' claim or derived from other claims.
    /// Used for role-based access control (RBAC) decisions.
    pub roles: Vec<String>,

    /// Tenant/organization ID (for multi-tenancy)
    ///
    /// When present, RLS policies can enforce tenant isolation.
    /// Extracted from JWT '`tenant_id`' or X-Tenant-Id header.
    pub tenant_id: Option<TenantId>,

    /// OAuth/permission scopes
    ///
    /// Format: `{action}:{resource}` or `{action}:{type}.{field}`
    /// Examples:
    /// - `read:user`
    /// - `write:post`
    /// - `read:User.email`
    /// - `admin:*`
    ///
    /// Extracted from JWT 'scope' claim.
    pub scopes: Vec<String>,

    /// Custom attributes from JWT claims
    ///
    /// Arbitrary key-value pairs from JWT payload.
    /// Examples: "department", "region", "tier", "country"
    ///
    /// Used by custom RLS policies that need domain-specific attributes.
    pub attributes: HashMap<String, serde_json::Value>,

    /// Request correlation ID for audit trails
    ///
    /// Extracted from X-Request-Id header or generated.
    /// Used for tracing and audit logging across services.
    pub request_id: String,

    /// Client IP address
    ///
    /// Extracted from X-Forwarded-For or connection socket.
    /// Used for geolocation and fraud detection in RLS policies.
    pub ip_address: Option<String>,

    /// When the JWT was issued
    pub authenticated_at: DateTime<Utc>,

    /// When the JWT expires
    pub expires_at: DateTime<Utc>,

    /// Token issuer (for multi-issuer systems)
    pub issuer: Option<String>,

    /// Token audience (for audience validation)
    pub audience: Option<String>,

    /// Normalised email address from the JWT `email` claim.
    ///
    /// Available as `jwt:email` in session variable mappings for RLS policies.
    pub email: Option<String>,

    /// Normalised display name from the JWT `name` claim.
    ///
    /// Available as `jwt:name` or `jwt:display_name` in session variable mappings.
    pub display_name: Option<String>,
}

impl SecurityContext {
    /// Attribute key under which the delegated user's UUID is carried (string
    /// form), for an agent request acting on behalf of a human. Read back via
    /// [`acting_for`](Self::acting_for) (#390).
    pub const ACTING_FOR_ATTRIBUTE: &'static str = "fraiseql.acting_for";
    /// Attribute key under which the request's [`ActorType`] is carried (the
    /// `snake_case` token), derived at [`from_user`](Self::from_user) and read
    /// back via [`actor_type`](Self::actor_type) (#390).
    pub const ACTOR_TYPE_ATTRIBUTE: &'static str = "fraiseql.actor_type";
    /// Attribute key recording that this principal passed the enrichment seam
    /// (#1336). Absent means "no transport resolved this principal", which is
    /// the fail-closed case the engine refuses when the schema declares an
    /// enrichment consumer — see [`EnrichmentMark`].
    pub const ENRICHMENT_ATTRIBUTE: &'static str = "fraiseql.enrichment";
    /// Attribute key under which the originating request's full W3C trace context
    /// is carried (a JSON object), used to populate the change-log `trace_context`
    /// JSONB column (#375).
    pub const TRACE_CONTEXT_ATTRIBUTE: &'static str = "fraiseql.trace_context";
    /// Attribute key under which the originating request's W3C trace id is
    /// stamped. Set by the server's request pipeline from the inbound
    /// `traceparent` header; read back via [`trace_id`](Self::trace_id).
    pub const TRACE_ID_ATTRIBUTE: &'static str = "fraiseql.trace_id";
    /// Attribute key under which the ingress transport is carried (#376): the
    /// door this request came through, e.g. `"mcp"`. Set by a transport that
    /// declares itself (via [`with_transport`](Self::with_transport)) — never
    /// from a client field: the `fraiseql.` namespace is stripped from token
    /// claims by the extractor, so a caller cannot forge it. Recorded into the
    /// change-log row's `extra_metadata.transport`.
    pub const TRANSPORT_ATTRIBUTE: &'static str = "fraiseql.transport";

    /// Create a security context from an authenticated user and request metadata.
    ///
    /// # Arguments
    ///
    /// * `user` - Authenticated user from JWT validation
    /// * `request_id` - Correlation ID for this request
    ///
    /// # Example
    ///
    /// ```no_run
    /// // Requires: a live AuthenticatedUser from JWT validation.
    /// // See: tests/integration/ for runnable examples.
    /// # use fraiseql_core::security::SecurityContext;
    /// # use fraiseql_core::security::AuthenticatedUser;
    /// # let authenticated_user: AuthenticatedUser = panic!("example");
    /// let context = SecurityContext::from_user(&authenticated_user, "req-123".to_string());
    /// ```
    #[must_use]
    pub fn from_user(user: &AuthenticatedUser, request_id: String) -> Self {
        // Classify the actor from the (signature-verified) JWT material at
        // construction time, so every auth path (OIDC, HS256, gRPC, MCP) that
        // builds a context from a user gets it. The API-key path overrides to
        // ServiceAccount at its own construction site (#390).
        let (actor_type, acting_for) =
            derive_actor(user.user_id.as_str(), &user.scopes, &user.extra_claims);
        SecurityContext {
            user_id: user.user_id.clone(),
            roles: roles_from_claims(&user.extra_claims),
            tenant_id: None,
            scopes: user.scopes.clone(),
            attributes: HashMap::new(),
            request_id,
            ip_address: None,
            authenticated_at: Utc::now(),
            expires_at: user.expires_at,
            issuer: None,
            audience: None,
            email: user.email.clone(),
            display_name: user.display_name.clone(),
        }
        .with_actor_type(actor_type)
        .with_acting_for(acting_for)
    }

    /// Construct the context for an internal scheduled / system job (#573 D6).
    ///
    /// Unlike [`from_user`](Self::from_user), this carries **no JWT and no request**
    /// — it is the server acting *as itself* for background work: a scheduled
    /// [`Source`](crate::schema::SourceDefinition), and (in future) `after:ingest`
    /// handlers and saga steps. It is the first and, at introduction, only
    /// construction of [`ActorType::SystemJob`].
    ///
    /// Its authority is **exactly** the `roles` + `scopes` the caller grants (the
    /// source's `run_as` ceiling). With neither, it is **fail-closed**: no roles and
    /// no scopes mean every RBAC / field-authz check denies and — with no `tenant` —
    /// tenant-scoped RLS admits nothing. A source therefore cannot write until an
    /// operator grants it a ceiling.
    ///
    /// `tenant` scopes writes for a single-tenant or global source (`None` = global
    /// / NULL tenant); a multi-tenant source leaves it `None` and re-scopes each
    /// write per message via [`with_tenant`](Self::with_tenant). `job_id` names the
    /// job (the source name) and becomes the `system_job:<id>` principal for the
    /// audit envelope; `request_id` correlates a single firing.
    ///
    /// The [`ActorType`] is *recorded* for audit, never an authorization input — the
    /// authority comes solely from `roles`/`scopes`.
    #[must_use]
    pub fn system_job(
        job_id: impl Into<String>,
        request_id: impl Into<String>,
        roles: Vec<String>,
        scopes: Vec<String>,
        tenant: Option<TenantId>,
    ) -> Self {
        let mut ctx = Self::principal_from_ceiling(
            format!("system_job:{}", job_id.into()),
            request_id,
            roles,
            scopes,
            tenant,
            ActorType::SystemJob,
        );
        // #1336: the server acting as itself has no subject a resolver could look
        // up, so it is exempt from the enrichment requirement — stated here, at the
        // one site that mints such a principal, rather than inferred downstream from
        // "nothing resolved it".
        ctx.mark_enrichment(EnrichmentMark::Exempt);
        ctx
    }

    /// Mint a **service-account** context from a `run_as` ceiling (ADR-0018).
    ///
    /// A service account is an *external* credentialed caller — a daemon or service
    /// authenticated by a static secret — as opposed to an internal
    /// [`system_job`](Self::system_job) firing. Authority is **exactly** the `run_as`
    /// ceiling (`roles`/`scopes`/`tenant`); an absent/empty ceiling ⇒ no authority (RLS
    /// and field-authz deny its writes). The identity is `service_account:<name>` and the
    /// [`ActorType`] is [`ServiceAccount`](ActorType::ServiceAccount) — recorded for audit
    /// (`tb_entity_change_log.actor_type`), never an authorization input.
    #[must_use]
    pub fn service_account(
        name: impl Into<String>,
        request_id: impl Into<String>,
        roles: Vec<String>,
        scopes: Vec<String>,
        tenant: Option<TenantId>,
    ) -> Self {
        Self::principal_from_ceiling(
            format!("service_account:{}", name.into()),
            request_id,
            roles,
            scopes,
            tenant,
            ActorType::ServiceAccount,
        )
    }

    /// Shared body for a machine principal minted from a `run_as` ceiling. The authority
    /// is exactly `roles`/`scopes`/`tenant`; `user_id` + `actor_type` carry the
    /// provenance (audit-only). Wrapped by [`system_job`](Self::system_job) and
    /// [`service_account`](Self::service_account).
    fn principal_from_ceiling(
        user_id: String,
        request_id: impl Into<String>,
        roles: Vec<String>,
        scopes: Vec<String>,
        tenant: Option<TenantId>,
        actor_type: ActorType,
    ) -> Self {
        let now = Utc::now();
        SecurityContext {
            user_id: UserId(user_id),
            roles,
            tenant_id: tenant,
            scopes,
            attributes: HashMap::new(),
            request_id: request_id.into(),
            ip_address: None,
            authenticated_at: now,
            // A machine principal's identity is minted fresh per request/firing and does
            // not outlive it; a generous window keeps any TTL check from tripping
            // mid-run (mirrors the live host's default context).
            expires_at: now + chrono::Duration::hours(24),
            issuer: None,
            audience: None,
            email: None,
            display_name: None,
        }
        .with_actor_type(actor_type)
    }

    /// Check if the user has a specific role.
    ///
    /// # Arguments
    ///
    /// * `role` - Role name to check (e.g., "admin", "moderator")
    ///
    /// # Returns
    ///
    /// `true` if the user has the specified role, `false` otherwise.
    #[must_use]
    pub fn has_role(&self, role: &str) -> bool {
        self.roles.iter().any(|r| r == role)
    }

    /// Check if the user has a specific scope.
    ///
    /// Supports wildcards: `admin:*` matches any admin scope.
    ///
    /// # Arguments
    ///
    /// * `scope` - Scope to check (e.g., "read:user", "write:post")
    ///
    /// # Returns
    ///
    /// `true` if the user has the specified scope, `false` otherwise.
    #[must_use]
    pub fn has_scope(&self, scope: &str) -> bool {
        self.scopes.iter().any(|s| {
            if s == scope {
                return true;
            }
            // Support wildcard matching: "admin:*" matches "admin:read"
            if s.ends_with(':') {
                scope.starts_with(s)
            } else if s.ends_with('*') {
                let prefix = &s[..s.len() - 1];
                scope.starts_with(prefix)
            } else {
                false
            }
        })
    }

    /// Get a custom attribute from the JWT claims.
    ///
    /// # Arguments
    ///
    /// * `key` - Attribute name
    ///
    /// # Returns
    ///
    /// The attribute value if present, `None` otherwise.
    #[must_use]
    pub fn get_attribute(&self, key: &str) -> Option<&serde_json::Value> {
        self.attributes.get(key)
    }

    /// The originating request's W3C trace id, when the server stamped one from
    /// the inbound `traceparent` header.
    ///
    /// Used to populate the change-log `trace_id` column so an outbox row links
    /// back to its distributed trace (#375); the #392 perf tooling surfaces it as
    /// the investigation handle. `None` when the request carried no trace context.
    #[must_use]
    pub fn trace_id(&self) -> Option<&str> {
        self.attributes
            .get(Self::TRACE_ID_ATTRIBUTE)
            .and_then(serde_json::Value::as_str)
    }

    /// Stamp the originating request's W3C trace id onto the context (carried in
    /// `attributes`). Read back via [`trace_id`](Self::trace_id).
    #[must_use]
    pub fn with_trace_id(mut self, trace_id: impl Into<String>) -> Self {
        self.attributes.insert(
            Self::TRACE_ID_ATTRIBUTE.to_string(),
            serde_json::Value::String(trace_id.into()),
        );
        self
    }

    /// The originating request's full W3C trace context (a JSON object), when the
    /// server stamped one from the inbound `traceparent`/`tracestate` headers.
    ///
    /// Used to populate the change-log `trace_context` JSONB column so an outbox
    /// row carries enough to re-propagate the distributed trace (#375). `None` when
    /// the request carried no valid trace context.
    #[must_use]
    pub fn trace_context(&self) -> Option<&serde_json::Value> {
        self.attributes.get(Self::TRACE_CONTEXT_ATTRIBUTE)
    }

    /// Stamp the originating request's full W3C trace context (a JSON object) onto
    /// the context (carried in `attributes`). Read back via
    /// [`trace_context`](Self::trace_context).
    #[must_use]
    pub fn with_trace_context(mut self, trace_context: serde_json::Value) -> Self {
        self.attributes.insert(Self::TRACE_CONTEXT_ATTRIBUTE.to_string(), trace_context);
        self
    }

    /// The request's actor classification (#390). Derived at
    /// [`from_user`](Self::from_user); [`ActorType::HumanUser`] when unset (e.g. a
    /// context built directly without derivation).
    #[must_use]
    pub fn actor_type(&self) -> ActorType {
        self.attributes
            .get(Self::ACTOR_TYPE_ATTRIBUTE)
            .and_then(serde_json::Value::as_str)
            .and_then(ActorType::from_token)
            .unwrap_or_default()
    }

    /// Stamp the request's [`ActorType`] onto the context (carried in
    /// `attributes`). Read back via [`actor_type`](Self::actor_type).
    #[must_use]
    pub fn with_actor_type(mut self, actor_type: ActorType) -> Self {
        self.attributes.insert(
            Self::ACTOR_TYPE_ATTRIBUTE.to_string(),
            serde_json::Value::String(actor_type.as_str().to_string()),
        );
        self
    }

    /// The delegated user (the human a delegated agent acts for), when the request
    /// carried an RFC 8693 `act` claim (#390). `None` for a non-delegated request,
    /// or when the underlying subject was not UUID-shaped.
    #[must_use]
    pub fn acting_for(&self) -> Option<Uuid> {
        self.attributes
            .get(Self::ACTING_FOR_ATTRIBUTE)
            .and_then(serde_json::Value::as_str)
            .and_then(|s| Uuid::parse_str(s).ok())
    }

    /// Stamp the delegated user's UUID onto the context (carried in `attributes`).
    /// `None` removes any prior stamp. Read back via [`acting_for`](Self::acting_for).
    #[must_use]
    pub fn with_acting_for(mut self, acting_for: Option<Uuid>) -> Self {
        match acting_for {
            Some(uuid) => {
                self.attributes.insert(
                    Self::ACTING_FOR_ATTRIBUTE.to_string(),
                    serde_json::Value::String(uuid.to_string()),
                );
            },
            None => {
                self.attributes.remove(Self::ACTING_FOR_ATTRIBUTE);
            },
        }
        self
    }

    /// The ingress transport this request declared (#376), e.g. `"mcp"`.
    /// `None` for transports that do not stamp one (today: everything except
    /// MCP), and for contexts built without a server pipeline.
    #[must_use]
    pub fn transport(&self) -> Option<&str> {
        self.attributes
            .get(Self::TRANSPORT_ATTRIBUTE)
            .and_then(serde_json::Value::as_str)
    }

    /// Stamp the ingress transport onto the context (carried in `attributes`,
    /// forge-safe: the extractor strips the `fraiseql.` namespace from token
    /// claims). Read back via [`transport`](Self::transport) and recorded into
    /// the change-log's `extra_metadata.transport` by the mutation runner.
    #[must_use]
    pub fn with_transport(mut self, transport: &str) -> Self {
        self.attributes.insert(
            Self::TRANSPORT_ATTRIBUTE.to_string(),
            serde_json::Value::String(transport.to_string()),
        );
        self
    }

    /// How this principal satisfied the enrichment requirement (#1336), or
    /// `None` when it never passed the seam.
    ///
    /// `None` is the fail-closed state, and it is the *default* precisely
    /// because the defect this guards against is a transport that builds a
    /// principal and dispatches it without resolving. A context that skipped
    /// the seam cannot claim to have passed it by saying nothing.
    #[must_use]
    pub fn enrichment_mark(&self) -> Option<EnrichmentMark> {
        match self
            .attributes
            .get(Self::ENRICHMENT_ATTRIBUTE)
            .and_then(serde_json::Value::as_str)
        {
            Some(EnrichmentMark::RESOLVED) => Some(EnrichmentMark::Resolved),
            Some(EnrichmentMark::EXEMPT) => Some(EnrichmentMark::Exempt),
            _ => None,
        }
    }

    /// Record that this principal passed the enrichment seam.
    ///
    /// Carried in `attributes` under the reserved `fraiseql.` namespace, which
    /// the token-claim builder strips — so a caller cannot mint this mark from a
    /// JWT claim. Only server code on the request path sets it.
    pub fn mark_enrichment(&mut self, mark: EnrichmentMark) {
        self.attributes.insert(
            Self::ENRICHMENT_ATTRIBUTE.to_string(),
            serde_json::Value::String(mark.as_str().to_string()),
        );
    }

    /// Check if the token has expired.
    ///
    /// # Returns
    ///
    /// `true` if the JWT has expired, `false` otherwise.
    #[must_use]
    pub fn is_expired(&self) -> bool {
        self.expires_at <= Utc::now()
    }

    /// Get time until expiry in seconds.
    ///
    /// # Returns
    ///
    /// Seconds until JWT expiry, negative if already expired.
    #[must_use]
    pub fn ttl_secs(&self) -> i64 {
        (self.expires_at - Utc::now()).num_seconds()
    }

    /// Check if the user is an admin.
    ///
    /// # Returns
    ///
    /// `true` if the user has the "admin" role, `false` otherwise.
    #[must_use]
    pub fn is_admin(&self) -> bool {
        self.has_role("admin")
    }

    /// Check if the context has a tenant ID (multi-tenancy enabled).
    ///
    /// # Returns
    ///
    /// `true` if `tenant_id` is present, `false` otherwise.
    #[must_use]
    pub const fn is_multi_tenant(&self) -> bool {
        self.tenant_id.is_some()
    }

    /// Set or override a role (for testing or runtime role modification).
    #[must_use]
    pub fn with_role(mut self, role: String) -> Self {
        self.roles.push(role);
        self
    }

    /// Set or override scopes (for testing or runtime permission modification).
    #[must_use]
    pub fn with_scopes(mut self, scopes: Vec<String>) -> Self {
        self.scopes = scopes;
        self
    }

    /// Set tenant ID (for multi-tenancy).
    pub fn with_tenant(mut self, tenant_id: impl Into<TenantId>) -> Self {
        self.tenant_id = Some(tenant_id.into());
        self
    }

    /// Set a custom attribute (for testing or runtime attribute addition).
    #[must_use]
    pub fn with_attribute(mut self, key: String, value: serde_json::Value) -> Self {
        self.attributes.insert(key, value);
        self
    }

    /// Check if user can access a field based on role definitions.
    ///
    /// Takes a required scope and checks if any of the user's roles grant that scope.
    ///
    /// # Arguments
    ///
    /// * `security_config` - Security config from compiled schema with role definitions
    /// * `required_scope` - Scope required to access the field (e.g., "read:User.email")
    ///
    /// # Returns
    ///
    /// `true` if the user's roles grant the required scope, `false` otherwise.
    ///
    /// # `default_role`
    ///
    /// A principal carrying **no role at all** falls back to
    /// `SecurityConfig::default_role` (#894). The condition is an *empty* role set,
    /// not a failed lookup: a principal that has been assigned roles has been given
    /// its authority, and quietly widening it when those roles fall short would make
    /// `default_role` a floor under every principal rather than a default.
    ///
    /// The fallback reaches authenticated principals only, because a
    /// `SecurityContext` exists only for one — an anonymous request has no principal
    /// and is classified by `apply_anonymous_field_rbac_filtering`, which never calls
    /// this method. That is deliberate: extending the fallback to anonymous callers
    /// would re-open #743's privilege inversion from the other side, handing every
    /// `requires_scope` field to callers who presented no credential.
    ///
    /// # Example
    ///
    /// ```no_run
    /// // Requires: a SecurityConfig from a compiled schema.
    /// // See: tests/integration/ for runnable examples.
    /// # use fraiseql_core::security::SecurityContext;
    /// # use fraiseql_core::schema::SecurityConfig;
    /// # let context: SecurityContext = panic!("example");
    /// # let config: SecurityConfig = panic!("example");
    /// let can_access = context.can_access_scope(&config, "read:User.email");
    /// ```
    #[must_use]
    pub fn can_access_scope(
        &self,
        security_config: &crate::schema::SecurityConfig,
        required_scope: &str,
    ) -> bool {
        // Check if any of user's roles grant this scope
        if self
            .roles
            .iter()
            .any(|role_name| security_config.role_has_scope(role_name, required_scope))
        {
            return true;
        }

        // #894: no role at all → the schema's declared default, if it declared one.
        if self.roles.is_empty() {
            if let Some(default_role) = security_config.default_role.as_deref() {
                return security_config.role_has_scope(default_role, required_scope);
            }
        }

        false
    }
}

impl std::fmt::Display for SecurityContext {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "SecurityContext(user_id={}, roles={:?}, scopes={}, tenant={:?})",
            self.user_id,
            self.roles,
            self.scopes.len(),
            self.tenant_id
        )
    }
}