handle array arguments in the regex

The regular expression for extracting a query name out of a query string
didn't work properly if an array argument was given. This meant that the
name wouldn't be extracted as expected.

With this change that should work properly, and a regression test has
been added.

README.md

@@ -36,7 +36,7 @@ The package can be installed by adding `uinta` to your list of dependencies in
 ```elixir
 def deps do
   [
-    {:uinta, "~> 0.3"}
+    {:uinta, "~> 0.4"}
   ]
 end
 ```

lib/uinta/plug.ex

@@ -61,7 +61,7 @@ if Code.ensure_loaded?(Plug) do
     @behaviour Plug
 
     @default_filter ~w(password passwordConfirmation idToken refreshToken)
-    @query_name_regex ~r/^(?:(?:query|mutation)\s+(\w+)(?:\(\$\w+:\s+\w+!?(?:,\s+\$\w+:\s+\w+!?)*\))?\s*)?{/
+    @query_name_regex ~r/^(?:(?:query|mutation)\s+(\w+)(?:\(\$\w+:\s+\[?\w+\]?!?(?:,\s+\$\w+:\s+\[?\w+\]?!?)*\))?\s*)?{/
 
     @type format :: :json | :string
     @type graphql_info :: %{type: String.t(), operation: String.t(), variables: String.t() | nil}

mix.exs

@@ -8,7 +8,7 @@ defmodule Uinta.MixProject do
       app: :uinta,
       name: "Uinta",
       description: "Simpler structured logs and lower log volume for Elixir apps",
-      version: "0.4.0",
+      version: "0.4.1",
       elixir: "~> 1.8",
       source_url: @project_url,
       homepage_url: @project_url,

test/uinta/plug_test.exs

@@ -212,7 +212,7 @@ defmodule Uinta.PlugTest do
 
     variables = %{
       "ep" => "JEDI",
-      review: %{"stars" => 5, "commentary" => "This is a great movie!"}
+      "review" => %{"stars" => 5, "commentary" => "This is a great movie!"}
     }
 
     params = %{"query" => query, "variables" => variables}
@@ -221,6 +221,27 @@ defmodule Uinta.PlugTest do
     assert message =~ "MUTATION CreateReviewForEpisode"
   end
 
+  test "gets the GraphQL operation name from the query when there is an array parameter" do
+    query = """
+    mutation track($userId: String!, $event: String!, $properties: [String]) { 
+      track(userId: $userId, event: $event, properties: $properties) { 
+        status 
+      } 
+    }
+    """
+
+    variables = %{
+      "userId" => "55203f63-0b79-426c-840e-ea68bdac765c",
+      "event" => "WEBSITE_WIDGET_PROMPT_SHOW",
+      "properties" => ["green", "firefox"]
+    }
+
+    params = %{"query" => query, "variables" => variables}
+
+    message = capture_log(fn -> MyPlug.call(conn(:post, "/graphql", params), []) end)
+    assert message =~ "MUTATION track"
+  end
+
   test "includes the query when it isn't named" do
     query = """
     {