FIX: Prevent 'rack.input' missing error.

lib/auth/default_current_user_provider.rb

@@ -39,7 +39,7 @@ class Auth::DefaultCurrentUserProvider
     request = @request
 
     user_api_key = @env[USER_API_KEY]
-    api_key = request[API_KEY]
+    api_key = @env.blank? ? nil : request[API_KEY]
 
     auth_token = request.cookies[TOKEN_COOKIE] unless user_api_key || api_key
 

spec/components/auth/default_current_user_provider_spec.rb

@@ -16,6 +16,11 @@ describe Auth::DefaultCurrentUserProvider do
     TestProvider.new(env)
   end
 
+  it "can be used to pretend that a user doesn't exist" do
+    provider = TestProvider.new({})
+    expect(provider.current_user).to eq(nil)
+  end
+
   context "server api" do
 
     it "raises errors for incorrect api_key" do