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absinthe
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GraphQL for Elixir
Security advisory:
This version has known vulnerabilities.
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lib/absinthe/phase/document/variables.ex
defmodule Absinthe.Phase.Document.Variables do
@moduledoc false
# Provided a set of variable values:
#
# - Set the `variables` field on the `Blueprint.Document.Operation.t` to the reconciled
# mapping of variable values, supporting defined default values.
#
# ## Examples
#
# Given a GraphQL document that looks like:
#
# ```
# query Item($id: ID!, $text = String = "Another") {
# item(id: $id, category: "Things") {
# name
# }
# }
# ```
#
# And this phase configuration:
#
# ```
# run(blueprint, %{"id" => "1234"})
# ``
#
# - The operation's `variables` field would have an `"id"` value set to
# `%Blueprint.Input.StringValue{value: "1234"}`
# - The operation's `variables` field would have an `"text"` value set to
# `%Blueprint.Input.StringValue{value: "Another"}`
#
# ```
# run(blueprint, %{})
# ```
#
# - The operation's `variables` field would have an `"id"` value set to
# `nil`
# - The operation's `variables` field would have an `"text"` value set to
# `%Blueprint.Input.StringValue{value: "Another"}`
#
# Note that no validation occurs in this phase.
use Absinthe.Phase
alias Absinthe.Blueprint
@spec run(Blueprint.t, Keyword.t) :: {:ok, Blueprint.t}
def run(input, options \\ []) do
do_run(input, Map.new(options))
end
def do_run(input, %{variables: values}) do
acc = %{raw: values, processed: %{}}
{node, _} = Blueprint.postwalk(input, acc, &handle_node/2)
{:ok, node}
end
@spec handle_node(Blueprint.node_t, map) :: {Blueprint.node_t, map}
defp handle_node(%Blueprint.Document.VariableDefinition{} = node, acc) do
provided_value =
acc.raw
|> Map.get(node.name, node.default_value)
|> Blueprint.Input.parse
{
%{node | provided_value: provided_value},
update_in(acc.processed, &Map.put(&1, node.name, provided_value))
}
end
defp handle_node(%Blueprint.Document.Operation{} = node, acc) do
{
%{node | provided_values: acc.processed},
acc
}
end
defp handle_node(node, acc) do
{node, acc}
end
end