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lib/absinthe/phase/validation/known_directives.ex
defmodule Absinthe.Phase.Validation.KnownDirectives do
@moduledoc false
alias Absinthe.{Blueprint, Phase}
use Absinthe.Phase
use Absinthe.Phase.Validation
@doc """
Run the validation.
"""
@spec run(Blueprint.t, Keyword.t) :: Phase.result_t
def run(input, _options \\ []) do
result = Blueprint.postwalk(input, &handle_node/1)
{:ok, result}
end
defp handle_node(%Blueprint.Directive{schema_node: nil} = node) do
node
|> put_error(error_unknown(node))
end
defp handle_node(%Blueprint.Directive{} = node) do
node
end
defp handle_node(%{directives: []} = node) do
node
end
defp handle_node(%{directives: _} = node) do
check_directives(node)
|> inherit_invalid(node.directives, :bad_directive)
end
defp handle_node(node) do
node
end
defp check_directives(node) do
placement = Blueprint.Directive.placement(node)
directives = for directive <- node.directives do
if directive.schema_node do
if placement in directive.schema_node.locations do
directive
else
directive
|> put_error(error_misplaced(directive, placement))
|> flag_invalid(:bad_placement)
end
else
directive
end
end
%{node | directives: directives}
end
# Generate the error for the node
@spec error_unknown(Blueprint.node_t) :: Phase.Error.t
defp error_unknown(node) do
Phase.Error.new(
__MODULE__,
"Unknown directive.",
location: node.source_location
)
end
@spec error_misplaced(Blueprint.node_t, atom) :: Phase.Error.t
defp error_misplaced(node, placement) do
placement_name = placement |> to_string |> String.upcase
Phase.Error.new(
__MODULE__,
"May not be used on #{placement_name}.",
location: node.source_location
)
end
end