cratestack-policy 0.4.4

//! Read-side policy types (predicates / expressions / literals).

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RelationQuantifier {
    ToOne,
    Some,
    Every,
    None,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum PolicyLiteral {
    Bool(bool),
    Int(i64),
    String(&'static str),
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ReadPredicate {
    AuthNotNull,
    AuthIsNull,
    HasRole {
        role: &'static str,
    },
    InTenant {
        tenant_id: &'static str,
    },
    AuthFieldEqLiteral {
        auth_field: &'static str,
        value: PolicyLiteral,
    },
    AuthFieldNeLiteral {
        auth_field: &'static str,
        value: PolicyLiteral,
    },
    FieldIsTrue {
        column: &'static str,
    },
    FieldEqLiteral {
        column: &'static str,
        value: PolicyLiteral,
    },
    FieldNeLiteral {
        column: &'static str,
        value: PolicyLiteral,
    },
    FieldEqAuth {
        column: &'static str,
        auth_field: &'static str,
    },
    FieldNeAuth {
        column: &'static str,
        auth_field: &'static str,
    },
    Relation {
        quantifier: RelationQuantifier,
        parent_table: &'static str,
        parent_column: &'static str,
        related_table: &'static str,
        related_column: &'static str,
        expr: &'static PolicyExpr,
    },
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct ReadPolicy {
    pub expr: PolicyExpr,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum PolicyExpr {
    Predicate(ReadPredicate),
    And(&'static [PolicyExpr]),
    Or(&'static [PolicyExpr]),
}