Split off validating full paths

The first part of a full path needs to be validated as a `top_level`
while the rest need to be validated as `wildcard`

app/validators/namespace_validator.rb

@@ -77,12 +77,14 @@ class NamespaceValidator < ActiveModel::EachValidator
   STRICT_RESERVED = (TOP_LEVEL_ROUTES | WILDCARD_ROUTES)
 
   def self.valid_full_path?(full_path)
-    pieces = full_path.split('/')
-    first_part = pieces.first
-    pieces.all? do |namespace|
-      type = first_part == namespace ? :top_level : :wildcard
-      valid?(namespace, type: type)
-    end
+    path_segments = full_path.split('/')
+    root_segment = path_segments.shift
+
+    valid?(root_segment, type: :top_level) && valid_wildcard_segments?(path_segments)
+  end
+
+  def self.valid_wildcard_segments?(segments)
+    segments.all? { |segment| valid?(segment, type: :wildcard) }
   end
 
   def self.valid?(value, type: :strict)

spec/validators/namespace_validator_spec.rb

@@ -81,6 +81,26 @@ describe NamespaceValidator do
     end
   end
 
+  describe '#valid_full_path' do
+    it "isn't valid when the top level is reserved" do
+      test_path = 'u/should-be-a/reserved-word'
+
+      expect(described_class.valid_full_path?(test_path)).to be(false)
+    end
+
+    it "isn't valid if any of the path segments is reserved" do
+      test_path = 'the-wildcard/wikis/is-a-reserved-path'
+
+      expect(described_class.valid_full_path?(test_path)).to be(false)
+    end
+
+    it "is valid if the path doen't contain reserved words" do
+      test_path = 'there-are/no-wildcards/in-this-path'
+
+      expect(described_class.valid_full_path?(test_path)).to be(true)
+    end
+  end
+
   describe '#validation_type' do
     it 'uses top level validation for groups without parent' do
       group = build(:group)