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package validator
import (
"github.com/vektah/gqlparser/v2/ast"
//nolint:revive // Validator rules each use dot imports for convenience.
. "github.com/vektah/gqlparser/v2/validator"
)
func init() {
AddRule("PossibleFragmentSpreads", func(observers *Events, addError AddErrFunc) {
validate := func(walker *Walker, parentDef *ast.Definition, fragmentName string, emitError func()) {
if parentDef == nil {
return
}
var parentDefs []*ast.Definition
switch parentDef.Kind {
case ast.Object:
parentDefs = []*ast.Definition{parentDef}
case ast.Interface, ast.Union:
parentDefs = walker.Schema.GetPossibleTypes(parentDef)
default:
return
}
fragmentDefType := walker.Schema.Types[fragmentName]
if fragmentDefType == nil {
return
}
if !fragmentDefType.IsCompositeType() {
// checked by FragmentsOnCompositeTypes
return
}
fragmentDefs := walker.Schema.GetPossibleTypes(fragmentDefType)
for _, fragmentDef := range fragmentDefs {
for _, parentDef := range parentDefs {
if parentDef.Name == fragmentDef.Name {
return
}
}
}
emitError()
}
observers.OnInlineFragment(func(walker *Walker, inlineFragment *ast.InlineFragment) {
validate(walker, inlineFragment.ObjectDefinition, inlineFragment.TypeCondition, func() {
addError(
Message(`Fragment cannot be spread here as objects of type "%s" can never be of type "%s".`, inlineFragment.ObjectDefinition.Name, inlineFragment.TypeCondition),
At(inlineFragment.Position),
)
})
})
observers.OnFragmentSpread(func(walker *Walker, fragmentSpread *ast.FragmentSpread) {
if fragmentSpread.Definition == nil {
return
}
validate(walker, fragmentSpread.ObjectDefinition, fragmentSpread.Definition.TypeCondition, func() {
addError(
Message(`Fragment "%s" cannot be spread here as objects of type "%s" can never be of type "%s".`, fragmentSpread.Name, fragmentSpread.ObjectDefinition.Name, fragmentSpread.Definition.TypeCondition),
At(fragmentSpread.Position),
)
})
})
})
}
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