Rename util class, add first usage

lib/xsd/schema.rb

@@ -0,0 +1,54 @@
+module Xsd
+  class Schema < ApplicationService
+    SCHEMA_PATH = 'lib/schemas/'.freeze
+    BASE_URL = 'https://epp.tld.ee/schema/'.freeze
+
+    attr_reader :xsd_schemas, :for_prefix
+
+    def initialize(params)
+      schema_path = params.fetch(:schema_path, SCHEMA_PATH)
+      @for_prefix = params.fetch(:for_prefix)
+      @xsd_schemas = Dir.entries(schema_path).select { |f| File.file? File.join(schema_path, f) }
+    end
+
+    def self.filename(*args, &block)
+      new(*args, &block).call
+    end
+
+    def call
+      filename = latest(for_prefix)
+      BASE_URL + filename
+    end
+
+    private
+
+    def latest(prefix)
+      schemas_by_name[prefix].last
+    end
+
+    def basename(filename)
+      File.basename(filename, '.xsd')
+    end
+
+    def prefix(filename)
+      regex = /([a-zA-Z]+-?[a-zA-Z]+)/
+
+      basename(filename).match(regex)[0]
+    end
+
+    def prefixes
+      xsd_schemas.map { |filename| prefix(filename) }.uniq
+    end
+
+    def schemas_by_name
+      prefixes.each_with_object({}) do |prefix, hash|
+        hash[prefix] = xsd_schemas.select { |filename| prefix_check(prefix, filename) }.uniq.sort
+      end
+    end
+
+    def prefix_check(prefix, filename)
+      version_regex = /\-\d+\S\d+/
+      (filename.include? prefix) && (filename.sub(prefix, '')[0, 4] =~ version_regex)
+    end
+  end
+end