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lib/absinthe/phase/schema/validation/default_enum_value_present.ex
defmodule Absinthe.Phase.Schema.Validation.DefaultEnumValuePresent do
use Absinthe.Phase
alias Absinthe.Blueprint
alias Absinthe.Blueprint.Schema
def run(blueprint, _opts) do
blueprint = Blueprint.prewalk(blueprint, &validate_schema/1)
{:ok, blueprint}
end
def validate_schema(%Schema.SchemaDefinition{} = schema) do
enums =
schema.type_definitions
|> Enum.filter(&match?(%Schema.EnumTypeDefinition{}, &1))
|> Map.new(&{&1.identifier, &1})
schema = Blueprint.prewalk(schema, &validate_defaults(&1, enums))
{:halt, schema}
end
def validate_schema(node), do: node
def validate_defaults(%{default_value: nil} = node, _) do
node
end
def validate_defaults(%{default_value: default_value, type: type} = node, enums) do
type = Blueprint.TypeReference.unwrap(type)
case Map.fetch(enums, type) do
{:ok, enum} ->
values = Enum.map(enum.values, & &1.value)
value_list = Enum.map(values, &"\n * #{inspect(&1)}")
case value_conforms_to_enum(node.type, default_value, values) do
{:error, value} ->
detail = %{
value_list: value_list,
type: type,
default_value: value
}
node |> put_error(error(node, detail))
{:ok, _} ->
node
end
_ ->
node
end
end
def validate_defaults(node, _) do
node
end
defp value_conforms_to_enum(%Blueprint.TypeReference.List{of_type: of_type}, value, enum_values)
when is_list(value) do
value
|> Enum.map(&value_conforms_to_enum(of_type, &1, enum_values))
|> Enum.find({:ok, value}, &match?({:error, _}, &1))
end
defp value_conforms_to_enum(%_{of_type: of_type}, value, enum_values) do
value_conforms_to_enum(of_type, value, enum_values)
end
defp value_conforms_to_enum(_, value, enum_values) do
if value in enum_values do
{:ok, value}
else
{:error, value}
end
end
defp error(node, data) do
%Absinthe.Phase.Error{
message: explanation(data),
locations: [node.__reference__.location],
phase: __MODULE__,
extra: data
}
end
@moduledoc false
def explanation(%{default_value: default_value, type: type, value_list: value_list}) do
"""
The default_value for an enum must be present in the enum values.
Could not use default value of `#{inspect(default_value)}` for #{inspect(type)}.
Valid values are:
#{value_list}
"""
end
end