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lib/absinthe/phase/schema/validation/object_interfaces_must_be_valid.ex
defmodule Absinthe.Phase.Schema.Validation.ObjectInterfacesMustBeValid do
use Absinthe.Phase
alias Absinthe.Blueprint
def run(bp, _) do
bp = Blueprint.prewalk(bp, &handle_schemas/1)
{:ok, bp}
end
defp handle_schemas(%Blueprint.Schema.SchemaDefinition{} = schema) do
ifaces =
schema.type_definitions
|> Enum.filter(&match?(%Blueprint.Schema.InterfaceTypeDefinition{}, &1))
|> Enum.map(& &1.identifier)
|> MapSet.new()
schema = Blueprint.prewalk(schema, &validate_objects(&1, ifaces))
{:halt, schema}
end
defp handle_schemas(obj) do
obj
end
defp validate_objects(%Blueprint.Schema.ObjectTypeDefinition{} = object, ifaces) do
Enum.reduce(object.interfaces, object, fn iface, object ->
if iface in ifaces do
object
else
detail = %{
object: object.identifier,
interface: iface
}
object |> put_error(error(object, detail))
end
end)
end
defp validate_objects(type, _) do
type
end
defp error(object, data) do
%Absinthe.Phase.Error{
message: explanation(data),
locations: [object.__reference__.location],
phase: __MODULE__,
extra: data
}
end
@description """
Only interfaces may be present in an Object's interface list.
Reference: https://github.com/facebook/graphql/blob/master/spec/Section%203%20--%20Type%20System.md#interfaces
"""
def explanation(%{object: obj, interface: interface}) do
"""
Type "#{obj}" cannot implement non-interface type "#{interface}"
#{@description}
"""
end
end