Validate filename for json schema validator

app/validators/json_schema_validator.rb

@@ -10,8 +10,12 @@
 #   end
 #
 class JsonSchemaValidator < ActiveModel::EachValidator
+  FILENAME_ALLOWED = /\A[a-z0-9_-]*\Z/.freeze
+  FilenameError = Class.new(StandardError)
+
   def initialize(options)
     raise ArgumentError, "Expected 'filename' as an argument" unless options[:filename]
+    raise FilenameError, "Must be a valid 'filename'" unless options[:filename].match?(FILENAME_ALLOWED)
 
     super(options)
   end

spec/validators/json_schema_validator_spec.rb

@@ -8,7 +8,7 @@ describe JsonSchemaValidator do
 
     subject { validator.validate(build_report_result) }
 
-    context 'when file_path is set' do
+    context 'when filename is set' do
       let(:validator) { described_class.new(attributes: [:data], filename: "build_report_result_data") }
 
       context 'when data is valid' do
@@ -31,12 +31,20 @@ describe JsonSchemaValidator do
       end
     end
 
-    context 'when file_path is not set' do
+    context 'when filename is not set' do
       let(:validator) { described_class.new(attributes: [:data]) }
 
       it 'raises an ArgumentError' do
         expect { subject }.to raise_error(ArgumentError)
       end
     end
+
+    context 'when filename is invalid' do
+      let(:validator) { described_class.new(attributes: [:data], filename: "invalid$filename") }
+
+      it 'raises a FilenameError' do
+        expect { subject }.to raise_error(described_class::FilenameError)
+      end
+    end
   end
 end