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The JSON:API extension for the Ash Framework.
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lib/ash_json_api/domain/persisters/define_router.ex
# SPDX-FileCopyrightText: 2019 ash_json_api contributors <https://github.com/ash-project/ash_json_api/graphs.contributors>
#
# SPDX-License-Identifier: MIT
defmodule AshJsonApi.Domain.Persisters.DefineRouter do
@moduledoc false
use Spark.Dsl.Transformer
alias Spark.Dsl.Transformer
def transform(dsl) do
routes = AshJsonApi.Domain.Info.routes(dsl)
route_matchers =
routes
|> Enum.sort(fn left, right ->
left_path = Path.split(left.route)
right_path = Path.split(right.route)
left_path
|> Enum.zip(right_path)
|> sorts_first?()
|> case do
:undecided ->
Enum.count(left_path) > Enum.count(right_path)
result ->
result
end
end)
|> Enum.map(&route_match/1)
{:ok,
Transformer.eval(
dsl,
[],
route_matchers ++
[
quote do
def json_api_match_route(_, _) do
:error
end
end
]
)}
end
# sobelow_skip ["DOS.StringToAtom"]
def route_match(route) do
split_route = String.split(route.route, "/", trim: true)
args =
Enum.map(split_route, fn
":" <> param ->
{String.to_atom(param), [], Elixir}
param ->
param
end)
params =
split_route
|> Enum.filter(&String.starts_with?(&1, ":"))
|> Enum.map(fn ":" <> param ->
{param, {String.to_atom(param), [], Elixir}}
end)
params = {:%{}, [], params}
quote do
def json_api_match_route(unquote(route.method), [unquote_splicing(args)]) do
{:ok, unquote(route.resource), unquote(Macro.escape(route)), unquote(params)}
end
def json_api_match_route(unquote(String.upcase(to_string(route.method))), [
unquote_splicing(args)
]) do
{:ok, unquote(route.resource), unquote(Macro.escape(route)), unquote(params)}
end
end
end
defp sorts_first?(zipped) do
Enum.reduce_while(zipped, :undecided, fn {left_part, right_part}, :undecided ->
left_param? = String.starts_with?(left_part, ":")
right_param? = String.starts_with?(right_part, ":")
cond do
left_part == right_part ->
{:cont, :undecided}
left_param? and not right_param? ->
{:halt, false}
not left_param? and right_param? ->
{:halt, true}
true ->
{:cont, :undecided}
end
end)
end
end