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validate.ex
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defmodule OpenApiSpex.Plug.Validate do
@moduledoc """
Module plug that validates params against the schema defined for an operation.
If validation fails, the plug will send a 422 response with the reason as the body.
This plug should always be run after `OpenApiSpex.Plug.Cast`, as it expects the params map to
have atom keys and query params converted from strings to the appropriate types.
## Example
defmodule MyApp.UserController do
use Phoenix.Controller
plug OpenApiSpex.Plug.Cast
plug OpenApiSpex.Plug.Validate
...
end
If you want customize the error response, you can provide the `:render_error` option to register a plug which creates
a custom response in the case of a validation error.
## Example
defmodule MyApp.UserController do
use Phoenix.Controller
plug OpenApiSpex.Plug.Cast
plug OpenApiSpex.Plug.Validate,
render_error: MyApp.RenderError
def render_error(conn, reason) do
msg = %{error: reason} |> Posion.encode!()
conn
|> Conn.put_resp_content_type("application/json")
|> Conn.send_resp(400, msg)
end
...
end
defmodule MyApp.RenderError do
def init(opts), do: opts
def call(conn, reason) do
msg = %{error: reason} |> Posion.encode!()
conn
|> Conn.put_resp_content_type("application/json")
|> Conn.send_resp(400, msg)
end
end
"""
@behaviour Plug
alias Plug.Conn
@impl Plug
def init(opts), do: Keyword.put_new(opts, :render_error, OpenApiSpex.Plug.DefaultRenderError)
@impl Plug
def call(conn, render_error: render_error) do
spec = conn.private.open_api_spex.spec
operation_id = conn.private.open_api_spex.operation_id
operation_lookup = conn.private.open_api_spex.operation_lookup
operation = operation_lookup[operation_id]
content_type = Conn.get_req_header(conn, "content-type")
|> Enum.at(0, "")
|> String.split(";")
|> Enum.at(0)
with :ok <- OpenApiSpex.validate(spec, operation, conn, content_type) do
conn
else
{:error, reason} ->
opts = render_error.init(reason)
conn
|> render_error.call(opts)
|> Plug.Conn.halt()
end
end
def render_error(conn, reason) do
conn |> Conn.send_resp(422, "#{reason}")
end
end

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