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use openfga_common::{Access, AuthorizationModel, Identifier, Relation, Type};
use std::{collections::HashMap, ops::Range};
use thiserror::Error;
#[derive(Debug, Error)]
pub enum ModelError {
#[error("Type with name {} was defined twice", type1.identifier.name)]
DuplicateTypeName { type1: Type, type2: Type },
#[error("Relation {} got defined twice on type {}",
relation1.identifier.name,
target_type.identifier.name)]
DuplicateRelationName {
relation1: Relation,
relation2: Relation,
target_type: Type,
},
#[error("Relation definition {} on type {} references relation {}, which does not exist",
relation.identifier.name,
target_type.identifier.name,
relation_identifier.name)]
UnknownRelation {
relation_identifier: Identifier,
access: Access,
relation: Relation,
target_type: Type,
},
#[error("Relation definition {} on type {} references itself",
relation.identifier.name,
target_type.identifier.name)]
SelfReferencingRelation {
relation_identifier: Identifier,
access: Access,
relation: Relation,
target_type: Type,
},
}
impl ModelError {
pub fn get_code(&self) -> u64 {
match self {
Self::DuplicateTypeName { type1: _, type2: _ } => 201,
Self::DuplicateRelationName {
relation1: _,
relation2: _,
target_type: _,
} => 202,
Self::UnknownRelation {
relation_identifier: _,
access: _,
relation: _,
target_type: _,
} => 203,
Self::SelfReferencingRelation {
relation_identifier: _,
access: _,
relation: _,
target_type: _,
} => 204,
}
}
pub fn get_span(&self) -> Range<usize> {
match self {
Self::DuplicateTypeName { type1: _, type2 } => type2.span.clone().unwrap(),
Self::DuplicateRelationName {
relation1: _,
relation2,
target_type: _,
} => relation2.span.clone().unwrap(),
Self::UnknownRelation {
relation_identifier,
access: _,
relation: _,
target_type: _,
} => relation_identifier.span.clone().unwrap(),
Self::SelfReferencingRelation {
relation_identifier,
access: _,
relation: _,
target_type: _,
} => relation_identifier.span.clone().unwrap(),
}
}
}
fn check_access(
access: &Access,
relation: &Relation,
rtype: &Type,
model: &AuthorizationModel,
errors: &mut Vec<ModelError>,
) {
match access {
Access::Difference {
base,
subtract,
span: _,
} => {
check_access(base, relation, rtype, model, errors);
check_access(subtract, relation, rtype, model, errors);
}
Access::Intersection { children, span: _ } => children
.iter()
.for_each(|a| check_access(a, relation, rtype, model, errors)),
Access::Union { children, span: _ } => children
.iter()
.for_each(|a| check_access(a, relation, rtype, model, errors)),
Access::SelfComputed {
relation: relation_identifier,
span: _,
} => {
if &relation_identifier.name == &relation.identifier.name {
errors.push(ModelError::SelfReferencingRelation {
relation_identifier: relation_identifier.clone(),
access: access.clone(),
relation: relation.clone(),
target_type: rtype.clone(),
});
} else if !rtype.relation_exists(&relation_identifier.name) {
errors.push(ModelError::UnknownRelation {
relation_identifier: relation_identifier.clone(),
access: access.clone(),
relation: relation.clone(),
target_type: rtype.clone(),
});
}
}
_ => (),
}
}
pub fn check_model(model: &AuthorizationModel) -> Result<(), Vec<ModelError>> {
let mut errors: Vec<ModelError> = Vec::new();
let mut type_map: HashMap<String, &Type> = HashMap::new();
model.types.iter().for_each(|t| {
if type_map.contains_key(&t.identifier.name) {
errors.push(ModelError::DuplicateTypeName {
type1: type_map.get(&t.identifier.name).unwrap().clone().clone(),
type2: t.clone(),
})
}
type_map.insert(t.identifier.name.clone(), t);
let mut relation_map: HashMap<String, &Relation> = HashMap::new();
t.relations.iter().for_each(|r| {
if relation_map.contains_key(&r.identifier.name) {
errors.push(ModelError::DuplicateRelationName {
relation1: relation_map
.get(&r.identifier.name)
.unwrap()
.clone()
.clone(),
relation2: r.clone(),
target_type: t.clone(),
});
}
relation_map.insert(r.identifier.name.clone(), r);
check_access(&r.access, r, t, model, &mut errors);
});
});
if errors.len() > 0 {
return Err(errors);
}
Ok(())
}