Add '/cookies/delete'

lib/httparrot.ex

@@ -12,6 +12,7 @@ defmodule HTTParrot do
              {'/redirect-to', HTTParrot.RedirectToHandler, []},
              {'/cookies', HTTParrot.CookiesHandler, []},
              {'/cookies/set', HTTParrot.SetCookiesHandler, []},
+             {'/cookies/delete', HTTParrot.DeleteCookiesHandler, []},
              {'/basic-auth/:user/:passwd', HTTParrot.BasicAuthHandler, []},
              {'/html', :cowboy_static, {:priv_file, :httparrot, "html.html"}} ] }
     ])

lib/httparrot/delete_cookies_handler.ex

@@ -0,0 +1,33 @@
+defmodule HTTParrot.DeleteCookiesHandler do
+  def init(_transport, _req, _opts) do
+    {:upgrade, :protocol, :cowboy_rest}
+  end
+
+  def allowed_methods(req, state) do
+    {["GET"], req, state}
+  end
+
+  def malformed_request(req, state) do
+    {qs_vals, req} = :cowboy_req.qs_vals(req)
+    if Enum.empty?(qs_vals), do: {true, req, state}, else: {false, req, qs_vals}
+  end
+
+  def content_types_provided(req, state) do
+    {[{{"application", "json", []}, :get_json}], req, state}
+  end
+
+  def get_json(req, qs_vals) do
+    req = Enum.reduce qs_vals, req, fn({name, value}, req) ->
+      delete_cookie(name, value, req)
+    end
+    {:ok, req} = :cowboy_req.reply(302, [{"location", "/cookies"}], "Redirecting...", req)
+    {:halt, req, qs_vals}
+  end
+
+  defp delete_cookie(name, true, req), do: delete_cookie(name, "", req)
+  defp delete_cookie(name, value, req) do
+    :cowboy_req.set_resp_cookie(name, value, [path: "/", max_age: 0], req)
+  end
+
+  def terminate(_, _, _), do: :ok
+end

test/delete_cookies_handler_test.exs

@@ -0,0 +1,23 @@
+defmodule HTTParrot.DeleteCookiesHandlerTest do
+  use ExUnit.Case
+  import :meck
+  import HTTParrot.DeleteCookiesHandler
+
+  setup do
+    new :cowboy_req
+  end
+
+  teardown do
+    unload :cowboy_req
+  end
+
+  test "delete cookies and redirect to /cookies " do
+    expect(:cowboy_req, :set_resp_cookie, [{[:k1, :v1, [path: "/", max_age: 0], :req1], :req2},
+                                           {[:k2, :v2, [path: "/", max_age: 0], :req2], :req3}])
+    expect(:cowboy_req, :reply, [{[302, [{"location", "/cookies"}], "Redirecting...", :req3], {:ok, :req4}}])
+
+    assert get_json(:req1, [k1: :v1, k2: :v2]) == {:halt, :req4, [k1: :v1, k2: :v2]}
+
+    assert validate :cowboy_req
+  end
+end