add foodsoft_config protection whitelisting

lib/foodsoft_config.rb

@@ -28,6 +28,9 @@
 #         shared_lists: false           # allow database connection override
 #         use_messages: true            # foodcoops can't disable the use of messages
 #
+# When you like to whitelist protected attributes, define an entry +all: true+,
+# then you can whitelist specific attributes setting them to +false+.
+#
 class FoodsoftConfig
 
   # @!attribute scope
@@ -152,7 +155,11 @@ class FoodsoftConfig
     # @return [Boolean] Whether this key may be set in the database
     def allowed_key?(key)
       # fast check for keys without nesting
+      if self.config[:protected].include? key
         return !self.config[:protected][key]
+      else
+        return !self.config[:protected][:all]
+      end
       # @todo allow to check nested keys as well
     end
 

spec/lib/foodsoft_config_spec.rb

@@ -5,11 +5,11 @@ describe FoodsoftConfig do
   let(:other_name) { Faker::Lorem.words(rand(2..4)).join(' ') }
 
   it 'returns a default value' do
-    expect(FoodsoftConfig[:protected][:database]).to be_true
+    expect(FoodsoftConfig[:protected][:database]).to be true
   end
 
   it 'returns an empty default value' do
-    expect(FoodsoftConfig[:protected][:LIUhniuyGNKUQTWfbiOQIWYexngo78hqexul]).to be_false
+    expect(FoodsoftConfig[:protected][:LIUhniuyGNKUQTWfbiOQIWYexngo78hqexul]).to be nil
   end
 
   it 'returns a configuration value' do
@@ -60,6 +60,20 @@ describe FoodsoftConfig do
     end
   end
 
+  it 'can protect all values' do
+    old_name = FoodsoftConfig[:name]
+    FoodsoftConfig.config[:protected][:all] = true
+    FoodsoftConfig[:name] = name
+    expect(FoodsoftConfig[:name]).to eq old_name
+  end
+
+  it 'can whitelist a value' do
+    FoodsoftConfig.config[:protected][:all] = true
+    FoodsoftConfig.config[:protected][:name] = false
+    FoodsoftConfig[:name] = name
+    expect(FoodsoftConfig[:name]).to eq name
+  end
+
   describe 'has indifferent access', type: :feature do
     it 'with symbol' do
       FoodsoftConfig[:name] = name