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GraphQL for Elixir
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lib/absinthe/phase/schema/validation/names_must_be_valid.ex
defmodule Absinthe.Phase.Schema.Validation.NamesMustBeValid do
@moduledoc false
use Absinthe.Phase
alias Absinthe.Blueprint
alias Absinthe.Blueprint.Schema
@valid_name_regex ~r/[_A-Za-z][_0-9A-Za-z]*/
def run(bp, _) do
bp = Blueprint.prewalk(bp, &validate_names/1)
{:ok, bp}
end
defp validate_names(%{name: nil} = entity) do
entity
end
defp validate_names(%struct{name: name} = entity) do
if valid_name?(name) do
entity
else
kind = struct_to_kind(struct)
detail = %{artifact: "#{kind} name", value: entity.name}
entity |> put_error(error(entity, detail))
end
end
defp validate_names(entity) do
entity
end
defp valid_name?(name) do
[match] = Regex.run(@valid_name_regex, name)
match == name
end
defp error(object, data) do
%Absinthe.Phase.Error{
message: explanation(data),
locations: [object.__reference__.location],
phase: __MODULE__,
extra: data
}
end
defp struct_to_kind(Schema.InputValueDefinition), do: "argument"
defp struct_to_kind(Schema.FieldDefinition), do: "field"
defp struct_to_kind(Schema.DirectiveDefinition), do: "directive"
defp struct_to_kind(Schema.ScalarTypeDefinition), do: "scalar"
defp struct_to_kind(Schema.ObjectTypeDefinition), do: "object"
defp struct_to_kind(Schema.InputObjectTypeDefinition), do: "input object"
defp struct_to_kind(_), do: "type"
@description """
Name does not match possible #{inspect(@valid_name_regex)} regex.
> Names in GraphQL are limited to this ASCII subset of possible characters to
> support interoperation with as many other systems as possible.
Reference: https://graphql.github.io/graphql-spec/June2018/#sec-Names
"""
def explanation(%{artifact: artifact, value: value}) do
artifact_name = String.capitalize(artifact)
"""
#{artifact_name} #{inspect(value)} has invalid characters.
#{@description}
"""
end
end