Import DevTo URL

app/models/dev_to/url.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+module DevTo
+	class Url
+		DEV_TO_HOST = "dev.to"
+
+		delegate :to_s, to: :url
+
+		def self.valid?(url)
+			uri = URI.parse(url)
+
+			uri.host == DEV_TO_HOST
+		end
+
+		def initialize(original_url)
+			@original_url = original_url
+			@url = URI.parse(original_url)
+		end
+
+		def username = @_username ||= url.path.delete_prefix("/").split("/")&.first
+
+		private
+
+		attr_reader :url
+	end
+end

test/models/dev_to/url_test.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class DevTo::UrlTest < ActiveSupport::TestCase
+	test "it returns the correct username" do
+		initial_url = "https://dev.to/author_name/article-slug"
+		dev_to_url = DevTo::Url.new(initial_url)
+
+		assert_equal "author_name", dev_to_url.username
+	end
+end