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translator.go
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translator.go
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package compiler
import (
"bufio"
"fmt"
"strings"
"github.com/jzelinskie/stringz"
"github.com/authzed/spicedb/pkg/caveats"
caveattypes "github.com/authzed/spicedb/pkg/caveats/types"
"github.com/authzed/spicedb/pkg/genutil/mapz"
"github.com/authzed/spicedb/pkg/namespace"
core "github.com/authzed/spicedb/pkg/proto/core/v1"
"github.com/authzed/spicedb/pkg/schemadsl/dslshape"
"github.com/authzed/spicedb/pkg/schemadsl/input"
)
type translationContext struct {
objectTypePrefix *string
mapper input.PositionMapper
schemaString string
skipValidate bool
}
func (tctx translationContext) prefixedPath(definitionName string) (string, error) {
var prefix, name string
if err := stringz.SplitInto(definitionName, "/", &prefix, &name); err != nil {
if tctx.objectTypePrefix == nil {
return "", fmt.Errorf("found reference `%s` without prefix", definitionName)
}
prefix = *tctx.objectTypePrefix
name = definitionName
}
if prefix == "" {
return name, nil
}
return stringz.Join("/", prefix, name), nil
}
const Ellipsis = "..."
func translate(tctx translationContext, root *dslNode) (*CompiledSchema, error) {
orderedDefinitions := make([]SchemaDefinition, 0, len(root.GetChildren()))
var objectDefinitions []*core.NamespaceDefinition
var caveatDefinitions []*core.CaveatDefinition
names := mapz.NewSet[string]()
for _, definitionNode := range root.GetChildren() {
var definition SchemaDefinition
switch definitionNode.GetType() {
case dslshape.NodeTypeCaveatDefinition:
def, err := translateCaveatDefinition(tctx, definitionNode)
if err != nil {
return nil, err
}
definition = def
caveatDefinitions = append(caveatDefinitions, def)
case dslshape.NodeTypeDefinition:
def, err := translateObjectDefinition(tctx, definitionNode)
if err != nil {
return nil, err
}
definition = def
objectDefinitions = append(objectDefinitions, def)
}
if !names.Add(definition.GetName()) {
return nil, definitionNode.ErrorWithSourcef(definition.GetName(), "found name reused between multiple definitions and/or caveats: %s", definition.GetName())
}
orderedDefinitions = append(orderedDefinitions, definition)
}
return &CompiledSchema{
CaveatDefinitions: caveatDefinitions,
ObjectDefinitions: objectDefinitions,
OrderedDefinitions: orderedDefinitions,
rootNode: root,
mapper: tctx.mapper,
}, nil
}
func translateCaveatDefinition(tctx translationContext, defNode *dslNode) (*core.CaveatDefinition, error) {
definitionName, err := defNode.GetString(dslshape.NodeCaveatDefinitionPredicateName)
if err != nil {
return nil, defNode.ErrorWithSourcef(definitionName, "invalid definition name: %w", err)
}
// parameters
paramNodes := defNode.List(dslshape.NodeCaveatDefinitionPredicateParameters)
if len(paramNodes) == 0 {
return nil, defNode.ErrorWithSourcef(definitionName, "caveat `%s` must have at least one parameter defined", definitionName)
}
env := caveats.NewEnvironment()
parameters := make(map[string]caveattypes.VariableType, len(paramNodes))
for _, paramNode := range paramNodes {
paramName, err := paramNode.GetString(dslshape.NodeCaveatParameterPredicateName)
if err != nil {
return nil, paramNode.ErrorWithSourcef(paramName, "invalid parameter name: %w", err)
}
if _, ok := parameters[paramName]; ok {
return nil, paramNode.ErrorWithSourcef(paramName, "duplicate parameter `%s` defined on caveat `%s`", paramName, definitionName)
}
typeRefNode, err := paramNode.Lookup(dslshape.NodeCaveatParameterPredicateType)
if err != nil {
return nil, paramNode.ErrorWithSourcef(paramName, "invalid type for parameter: %w", err)
}
translatedType, err := translateCaveatTypeReference(tctx, typeRefNode)
if err != nil {
return nil, paramNode.ErrorWithSourcef(paramName, "invalid type for caveat parameter `%s` on caveat `%s`: %w", paramName, definitionName, err)
}
parameters[paramName] = *translatedType
err = env.AddVariable(paramName, *translatedType)
if err != nil {
return nil, paramNode.ErrorWithSourcef(paramName, "invalid type for caveat parameter `%s` on caveat `%s`: %w", paramName, definitionName, err)
}
}
caveatPath, err := tctx.prefixedPath(definitionName)
if err != nil {
return nil, defNode.Errorf("%w", err)
}
// caveat expression.
expressionStringNode, err := defNode.Lookup(dslshape.NodeCaveatDefinitionPredicateExpession)
if err != nil {
return nil, defNode.ErrorWithSourcef(definitionName, "invalid expression: %w", err)
}
expressionString, err := expressionStringNode.GetString(dslshape.NodeCaveatExpressionPredicateExpression)
if err != nil {
return nil, defNode.ErrorWithSourcef(expressionString, "invalid expression: %w", err)
}
rnge, err := expressionStringNode.Range(tctx.mapper)
if err != nil {
return nil, defNode.ErrorWithSourcef(expressionString, "invalid expression: %w", err)
}
source, err := caveats.NewSource(expressionString, rnge.Start(), caveatPath)
if err != nil {
return nil, defNode.ErrorWithSourcef(expressionString, "invalid expression: %w", err)
}
compiled, err := caveats.CompileCaveatWithSource(env, caveatPath, source)
if err != nil {
return nil, expressionStringNode.ErrorWithSourcef(expressionString, "invalid expression for caveat `%s`: %w", definitionName, err)
}
def, err := namespace.CompiledCaveatDefinition(env, caveatPath, compiled)
if err != nil {
return nil, err
}
def.Metadata = addComments(def.Metadata, defNode)
def.SourcePosition = getSourcePosition(defNode, tctx.mapper)
return def, nil
}
func translateCaveatTypeReference(tctx translationContext, typeRefNode *dslNode) (*caveattypes.VariableType, error) {
typeName, err := typeRefNode.GetString(dslshape.NodeCaveatTypeReferencePredicateType)
if err != nil {
return nil, typeRefNode.ErrorWithSourcef(typeName, "invalid type name: %w", err)
}
childTypeNodes := typeRefNode.List(dslshape.NodeCaveatTypeReferencePredicateChildTypes)
childTypes := make([]caveattypes.VariableType, 0, len(childTypeNodes))
for _, childTypeNode := range childTypeNodes {
translated, err := translateCaveatTypeReference(tctx, childTypeNode)
if err != nil {
return nil, err
}
childTypes = append(childTypes, *translated)
}
constructedType, err := caveattypes.BuildType(typeName, childTypes)
if err != nil {
return nil, typeRefNode.ErrorWithSourcef(typeName, "%w", err)
}
return constructedType, nil
}
func translateObjectDefinition(tctx translationContext, defNode *dslNode) (*core.NamespaceDefinition, error) {
definitionName, err := defNode.GetString(dslshape.NodeDefinitionPredicateName)
if err != nil {
return nil, defNode.ErrorWithSourcef(definitionName, "invalid definition name: %w", err)
}
relationsAndPermissions := []*core.Relation{}
for _, relationOrPermissionNode := range defNode.GetChildren() {
if relationOrPermissionNode.GetType() == dslshape.NodeTypeComment {
continue
}
relationOrPermission, err := translateRelationOrPermission(tctx, relationOrPermissionNode)
if err != nil {
return nil, err
}
relationsAndPermissions = append(relationsAndPermissions, relationOrPermission)
}
nspath, err := tctx.prefixedPath(definitionName)
if err != nil {
return nil, defNode.Errorf("%w", err)
}
if len(relationsAndPermissions) == 0 {
ns := namespace.Namespace(nspath)
ns.Metadata = addComments(ns.Metadata, defNode)
ns.SourcePosition = getSourcePosition(defNode, tctx.mapper)
if !tctx.skipValidate {
if err = ns.Validate(); err != nil {
return nil, defNode.Errorf("error in object definition %s: %w", nspath, err)
}
}
return ns, nil
}
ns := namespace.Namespace(nspath, relationsAndPermissions...)
ns.Metadata = addComments(ns.Metadata, defNode)
ns.SourcePosition = getSourcePosition(defNode, tctx.mapper)
if !tctx.skipValidate {
if err := ns.Validate(); err != nil {
return nil, defNode.Errorf("error in object definition %s: %w", nspath, err)
}
}
return ns, nil
}
func getSourcePosition(dslNode *dslNode, mapper input.PositionMapper) *core.SourcePosition {
if !dslNode.Has(dslshape.NodePredicateStartRune) {
return nil
}
sourceRange, err := dslNode.Range(mapper)
if err != nil {
return nil
}
line, col, err := sourceRange.Start().LineAndColumn()
if err != nil {
return nil
}
return &core.SourcePosition{
ZeroIndexedLineNumber: uint64(line),
ZeroIndexedColumnPosition: uint64(col),
}
}
func addComments(mdmsg *core.Metadata, dslNode *dslNode) *core.Metadata {
for _, child := range dslNode.GetChildren() {
if child.GetType() == dslshape.NodeTypeComment {
value, err := child.GetString(dslshape.NodeCommentPredicateValue)
if err == nil {
mdmsg, _ = namespace.AddComment(mdmsg, normalizeComment(value))
}
}
}
return mdmsg
}
func normalizeComment(value string) string {
var lines []string
scanner := bufio.NewScanner(strings.NewReader(value))
for scanner.Scan() {
trimmed := strings.TrimSpace(scanner.Text())
lines = append(lines, trimmed)
}
return strings.Join(lines, "\n")
}
func translateRelationOrPermission(tctx translationContext, relOrPermNode *dslNode) (*core.Relation, error) {
switch relOrPermNode.GetType() {
case dslshape.NodeTypeRelation:
rel, err := translateRelation(tctx, relOrPermNode)
if err != nil {
return nil, err
}
rel.Metadata = addComments(rel.Metadata, relOrPermNode)
rel.SourcePosition = getSourcePosition(relOrPermNode, tctx.mapper)
return rel, err
case dslshape.NodeTypePermission:
rel, err := translatePermission(tctx, relOrPermNode)
if err != nil {
return nil, err
}
rel.Metadata = addComments(rel.Metadata, relOrPermNode)
rel.SourcePosition = getSourcePosition(relOrPermNode, tctx.mapper)
return rel, err
default:
return nil, relOrPermNode.Errorf("unknown definition top-level node type %s", relOrPermNode.GetType())
}
}
func translateRelation(tctx translationContext, relationNode *dslNode) (*core.Relation, error) {
relationName, err := relationNode.GetString(dslshape.NodePredicateName)
if err != nil {
return nil, relationNode.Errorf("invalid relation name: %w", err)
}
allowedDirectTypes := []*core.AllowedRelation{}
for _, typeRef := range relationNode.List(dslshape.NodeRelationPredicateAllowedTypes) {
allowedRelations, err := translateAllowedRelations(tctx, typeRef)
if err != nil {
return nil, err
}
allowedDirectTypes = append(allowedDirectTypes, allowedRelations...)
}
relation, err := namespace.Relation(relationName, nil, allowedDirectTypes...)
if err != nil {
return nil, err
}
if !tctx.skipValidate {
if err := relation.Validate(); err != nil {
return nil, relationNode.Errorf("error in relation %s: %w", relationName, err)
}
}
return relation, nil
}
func translatePermission(tctx translationContext, permissionNode *dslNode) (*core.Relation, error) {
permissionName, err := permissionNode.GetString(dslshape.NodePredicateName)
if err != nil {
return nil, permissionNode.Errorf("invalid permission name: %w", err)
}
expressionNode, err := permissionNode.Lookup(dslshape.NodePermissionPredicateComputeExpression)
if err != nil {
return nil, permissionNode.Errorf("invalid permission expression: %w", err)
}
rewrite, err := translateExpression(tctx, expressionNode)
if err != nil {
return nil, err
}
permission, err := namespace.Relation(permissionName, rewrite)
if err != nil {
return nil, err
}
if !tctx.skipValidate {
if err := permission.Validate(); err != nil {
return nil, permissionNode.Errorf("error in permission %s: %w", permissionName, err)
}
}
return permission, nil
}
func translateBinary(tctx translationContext, expressionNode *dslNode) (*core.SetOperation_Child, *core.SetOperation_Child, error) {
leftChild, err := expressionNode.Lookup(dslshape.NodeExpressionPredicateLeftExpr)
if err != nil {
return nil, nil, err
}
rightChild, err := expressionNode.Lookup(dslshape.NodeExpressionPredicateRightExpr)
if err != nil {
return nil, nil, err
}
leftOperation, err := translateExpressionOperation(tctx, leftChild)
if err != nil {
return nil, nil, err
}
rightOperation, err := translateExpressionOperation(tctx, rightChild)
if err != nil {
return nil, nil, err
}
return leftOperation, rightOperation, nil
}
func translateExpression(tctx translationContext, expressionNode *dslNode) (*core.UsersetRewrite, error) {
translated, err := translateExpressionDirect(tctx, expressionNode)
if err != nil {
return translated, err
}
translated.SourcePosition = getSourcePosition(expressionNode, tctx.mapper)
return translated, nil
}
func collapseOps(op *core.SetOperation_Child, handler func(rewrite *core.UsersetRewrite) *core.SetOperation) []*core.SetOperation_Child {
if op.GetUsersetRewrite() == nil {
return []*core.SetOperation_Child{op}
}
usersetRewrite := op.GetUsersetRewrite()
operation := handler(usersetRewrite)
if operation == nil {
return []*core.SetOperation_Child{op}
}
collapsed := make([]*core.SetOperation_Child, 0, len(operation.Child))
for _, child := range operation.Child {
collapsed = append(collapsed, collapseOps(child, handler)...)
}
return collapsed
}
func translateExpressionDirect(tctx translationContext, expressionNode *dslNode) (*core.UsersetRewrite, error) {
// For union and intersection, we collapse a tree of binary operations into a flat list containing child
// operations of the *same* type.
translate := func(
builder func(firstChild *core.SetOperation_Child, rest ...*core.SetOperation_Child) *core.UsersetRewrite,
lookup func(rewrite *core.UsersetRewrite) *core.SetOperation,
) (*core.UsersetRewrite, error) {
leftOperation, rightOperation, err := translateBinary(tctx, expressionNode)
if err != nil {
return nil, err
}
leftOps := collapseOps(leftOperation, lookup)
rightOps := collapseOps(rightOperation, lookup)
ops := append(leftOps, rightOps...)
return builder(ops[0], ops[1:]...), nil
}
switch expressionNode.GetType() {
case dslshape.NodeTypeUnionExpression:
return translate(namespace.Union, func(rewrite *core.UsersetRewrite) *core.SetOperation {
return rewrite.GetUnion()
})
case dslshape.NodeTypeIntersectExpression:
return translate(namespace.Intersection, func(rewrite *core.UsersetRewrite) *core.SetOperation {
return rewrite.GetIntersection()
})
case dslshape.NodeTypeExclusionExpression:
// Order matters for exclusions, so do not perform the optimization.
leftOperation, rightOperation, err := translateBinary(tctx, expressionNode)
if err != nil {
return nil, err
}
return namespace.Exclusion(leftOperation, rightOperation), nil
default:
op, err := translateExpressionOperation(tctx, expressionNode)
if err != nil {
return nil, err
}
return namespace.Union(op), nil
}
}
func translateExpressionOperation(tctx translationContext, expressionOpNode *dslNode) (*core.SetOperation_Child, error) {
translated, err := translateExpressionOperationDirect(tctx, expressionOpNode)
if err != nil {
return translated, err
}
translated.SourcePosition = getSourcePosition(expressionOpNode, tctx.mapper)
return translated, nil
}
func translateExpressionOperationDirect(tctx translationContext, expressionOpNode *dslNode) (*core.SetOperation_Child, error) {
switch expressionOpNode.GetType() {
case dslshape.NodeTypeIdentifier:
referencedRelationName, err := expressionOpNode.GetString(dslshape.NodeIdentiferPredicateValue)
if err != nil {
return nil, err
}
return namespace.ComputedUserset(referencedRelationName), nil
case dslshape.NodeTypeNilExpression:
return namespace.Nil(), nil
case dslshape.NodeTypeArrowExpression:
leftChild, err := expressionOpNode.Lookup(dslshape.NodeExpressionPredicateLeftExpr)
if err != nil {
return nil, err
}
rightChild, err := expressionOpNode.Lookup(dslshape.NodeExpressionPredicateRightExpr)
if err != nil {
return nil, err
}
if leftChild.GetType() != dslshape.NodeTypeIdentifier {
return nil, leftChild.Errorf("Nested arrows not yet supported")
}
tuplesetRelation, err := leftChild.GetString(dslshape.NodeIdentiferPredicateValue)
if err != nil {
return nil, err
}
usersetRelation, err := rightChild.GetString(dslshape.NodeIdentiferPredicateValue)
if err != nil {
return nil, err
}
return namespace.TupleToUserset(tuplesetRelation, usersetRelation), nil
case dslshape.NodeTypeUnionExpression:
fallthrough
case dslshape.NodeTypeIntersectExpression:
fallthrough
case dslshape.NodeTypeExclusionExpression:
rewrite, err := translateExpression(tctx, expressionOpNode)
if err != nil {
return nil, err
}
return namespace.Rewrite(rewrite), nil
default:
return nil, expressionOpNode.Errorf("unknown expression node type %s", expressionOpNode.GetType())
}
}
func translateAllowedRelations(tctx translationContext, typeRefNode *dslNode) ([]*core.AllowedRelation, error) {
switch typeRefNode.GetType() {
case dslshape.NodeTypeTypeReference:
references := []*core.AllowedRelation{}
for _, subRefNode := range typeRefNode.List(dslshape.NodeTypeReferencePredicateType) {
subReferences, err := translateAllowedRelations(tctx, subRefNode)
if err != nil {
return []*core.AllowedRelation{}, err
}
references = append(references, subReferences...)
}
return references, nil
case dslshape.NodeTypeSpecificTypeReference:
ref, err := translateSpecificTypeReference(tctx, typeRefNode)
if err != nil {
return []*core.AllowedRelation{}, err
}
return []*core.AllowedRelation{ref}, nil
default:
return nil, typeRefNode.Errorf("unknown type ref node type %s", typeRefNode.GetType())
}
}
func translateSpecificTypeReference(tctx translationContext, typeRefNode *dslNode) (*core.AllowedRelation, error) {
typePath, err := typeRefNode.GetString(dslshape.NodeSpecificReferencePredicateType)
if err != nil {
return nil, typeRefNode.Errorf("invalid type name: %w", err)
}
nspath, err := tctx.prefixedPath(typePath)
if err != nil {
return nil, typeRefNode.Errorf("%w", err)
}
if typeRefNode.Has(dslshape.NodeSpecificReferencePredicateWildcard) {
ref := &core.AllowedRelation{
Namespace: nspath,
RelationOrWildcard: &core.AllowedRelation_PublicWildcard_{
PublicWildcard: &core.AllowedRelation_PublicWildcard{},
},
}
err = addWithCaveats(tctx, typeRefNode, ref)
if err != nil {
return nil, typeRefNode.Errorf("invalid caveat: %w", err)
}
if !tctx.skipValidate {
if err := ref.Validate(); err != nil {
return nil, typeRefNode.Errorf("invalid type relation: %w", err)
}
}
ref.SourcePosition = getSourcePosition(typeRefNode, tctx.mapper)
return ref, nil
}
relationName := Ellipsis
if typeRefNode.Has(dslshape.NodeSpecificReferencePredicateRelation) {
relationName, err = typeRefNode.GetString(dslshape.NodeSpecificReferencePredicateRelation)
if err != nil {
return nil, typeRefNode.Errorf("invalid type relation: %w", err)
}
}
ref := &core.AllowedRelation{
Namespace: nspath,
RelationOrWildcard: &core.AllowedRelation_Relation{
Relation: relationName,
},
}
err = addWithCaveats(tctx, typeRefNode, ref)
if err != nil {
return nil, typeRefNode.Errorf("invalid caveat: %w", err)
}
if !tctx.skipValidate {
if err := ref.Validate(); err != nil {
return nil, typeRefNode.Errorf("invalid type relation: %w", err)
}
}
ref.SourcePosition = getSourcePosition(typeRefNode, tctx.mapper)
return ref, nil
}
func addWithCaveats(_ translationContext, typeRefNode *dslNode, ref *core.AllowedRelation) error {
caveats := typeRefNode.List(dslshape.NodeSpecificReferencePredicateCaveat)
if len(caveats) == 0 {
return nil
}
if len(caveats) != 1 {
return fmt.Errorf("only one caveat is currently allowed per type reference")
}
name, err := caveats[0].GetString(dslshape.NodeCaveatPredicateCaveat)
if err != nil {
return err
}
ref.RequiredCaveat = &core.AllowedCaveat{
CaveatName: name,
}
return nil
}