From 991d6d5d87de61d131c841344a9dfa0431fb684c Mon Sep 17 00:00:00 2001
From: sasamuku <sasazawa3330@gmail.com>
Date: Thu, 21 Sep 2023 19:37:53 +0900
Subject: [PATCH] support for uniqueItems in array

---
 lib/openapi_parser/errors.rb                      | 11 +++++++++++
 .../schema_validator/array_validator.rb           |  9 +++++++++
 .../schema_validator/array_validator_spec.rb      | 15 ++++++++++++++-
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/lib/openapi_parser/errors.rb b/lib/openapi_parser/errors.rb
index 8ffddd8..18fc93f 100644
--- a/lib/openapi_parser/errors.rb
+++ b/lib/openapi_parser/errors.rb
@@ -272,4 +272,15 @@ def message
       "#{@reference} #{@value.inspect} contains fewer than min items"
     end
   end
+
+  class NotUniqueItems < OpenAPIError
+    def initialize(value, reference)
+      super(reference)
+      @value = value
+    end
+
+    def message
+      "#{@reference} #{@value.inspect} contains duplicate items"
+    end
+  end
 end
diff --git a/lib/openapi_parser/schema_validator/array_validator.rb b/lib/openapi_parser/schema_validator/array_validator.rb
index b7ec082..71df390 100644
--- a/lib/openapi_parser/schema_validator/array_validator.rb
+++ b/lib/openapi_parser/schema_validator/array_validator.rb
@@ -8,6 +8,9 @@ def coerce_and_validate(value, schema, **_keyword_args)
       value, err = validate_max_min_items(value, schema)
       return [nil, err] if err
 
+      value, err = validate_unique_items(value, schema)
+      return [nil, err] if err
+
       # array type have an schema in items property
       items_schema = schema.items
       coerced_values = value.map do |v|
@@ -28,5 +31,11 @@ def validate_max_min_items(value, schema)
 
       [value, nil]
     end
+
+    def validate_unique_items(value, schema)
+      return [nil, OpenAPIParser::NotUniqueItems.new(value, schema.object_reference)] if schema.uniqueItems && value.length != value.uniq.length
+
+      [value, nil]
+    end
   end
 end
diff --git a/spec/openapi_parser/schema_validator/array_validator_spec.rb b/spec/openapi_parser/schema_validator/array_validator_spec.rb
index 5c36c35..b44a234 100644
--- a/spec/openapi_parser/schema_validator/array_validator_spec.rb
+++ b/spec/openapi_parser/schema_validator/array_validator_spec.rb
@@ -19,7 +19,8 @@
           type: 'array',
           items: { 'type': 'integer' },
           maxItems: 2,
-          minItems: 1
+          minItems: 1,
+          uniqueItems: true
         },
       }
     end
@@ -53,6 +54,18 @@
           end
         end
       end
+
+      context 'unique items breached' do
+        let(:invalid_array) { [1, 1] }
+        let(:params) { { 'ids' => invalid_array } }
+
+        it do
+          expect { subject }.to raise_error do |e|
+            expect(e).to be_kind_of(OpenAPIParser::NotUniqueItems)
+            expect(e.message).to end_with("#{invalid_array} contains duplicate items")
+          end
+        end
+      end
     end
   end
 end