Improve Gitlab::ImportSources

app/controllers/import/github_controller.rb

@@ -82,7 +82,7 @@ class Import::GithubController < Import::BaseController
   def provider_unauthorized
     session[:access_token] = nil
     redirect_to new_import_url,
-      alert: "Access denied to your #{Gitlab::ImportSources.options.key(provider.to_s)} account."
+      alert: "Access denied to your #{Gitlab::ImportSources.title(provider.to_s)} account."
   end
 
   def access_params

app/services/projects/import_service.rb

@@ -4,16 +4,6 @@ module Projects
 
     class Error < StandardError; end
 
-    ALLOWED_TYPES = [
-      'github',
-      'bitbucket',
-      'gitlab',
-      'google_code',
-      'fogbugz',
-      'gitlab_project',
-      'gitea'
-    ]
-
     def execute
       add_repository_to_project unless project.gitlab_project_import?
 
@@ -65,29 +55,11 @@ module Projects
     end
 
     def has_importer?
-      ALLOWED_TYPES.include?(project.import_type)
+      Gitlab::ImportSources.importer_names.include?(project.import_type)
     end
 
     def importer
-      return Gitlab::ImportExport::Importer.new(project) if @project.gitlab_project_import?
-
-      class_name =
-        case project.import_type
-        when 'github', 'gitea'
-          Gitlab::GithubImport::Importer
-        when 'bitbucket'
-          Gitlab::BitbucketImport::Importer
-        when 'gitlab'
-          Gitlab::GitlabImport::Importer
-        when 'google_code'
-          Gitlab::GoogleCodeImport::Importer
-        when 'fogbugz'
-          Gitlab::FogbugzImport::Importer
-        else
-          raise 'Unknown importer type!'
-        end
-
-      class_name.new(project)
+      Gitlab::ImportSources.importer(project.import_type).new(project)
     end
 
     def unknown_url?

lib/gitlab/import_sources.rb

@@ -7,22 +7,38 @@ module Gitlab
   module ImportSources
     extend CurrentSettings
 
+    ImportSource = Struct.new(:name, :title, :importer)
+
+    ImportTable = [
+      ImportSource.new('github',         'GitHub',        Gitlab::GithubImport::Importer),
+      ImportSource.new('bitbucket',      'Bitbucket',     Gitlab::BitbucketImport::Importer),
+      ImportSource.new('gitlab',         'GitLab.com',    Gitlab::GitlabImport::Importer),
+      ImportSource.new('google_code',    'Google Code',   Gitlab::GoogleCodeImport::Importer),
+      ImportSource.new('fogbugz',        'FogBugz',       Gitlab::FogbugzImport::Importer),
+      ImportSource.new('git',            'Repo by URL',   nil),
+      ImportSource.new('gitlab_project', 'GitLab export', Gitlab::ImportExport::Importer),
+      ImportSource.new('gitea',          'Gitea',         Gitlab::GithubImport::Importer)
+    ].freeze
+
     class << self
+      def options
+        @options ||= Hash[ImportTable.map { |importer| [importer.title, importer.name] }]
+      end
+
       def values
-        options.values
+        @values ||= ImportTable.map(&:name)
       end
 
-      def options
-        {
-          'GitHub'        => 'github',
-          'Bitbucket'     => 'bitbucket',
-          'GitLab.com'    => 'gitlab',
-          'Google Code'   => 'google_code',
-          'FogBugz'       => 'fogbugz',
-          'Repo by URL'   => 'git',
-          'GitLab export' => 'gitlab_project',
-          'Gitea'         => 'gitea'
-        }
+      def importer_names
+        @importer_names ||= ImportTable.select(&:importer).map(&:name)
+      end
+
+      def importer(name)
+        ImportTable.find { |import_source| import_source.name == name }.importer
+      end
+
+      def title(name)
+        options.key(name)
       end
     end
   end

spec/lib/gitlab/import_sources_spec.rb

+require 'spec_helper'
+
+describe Gitlab::ImportSources do
+  describe '.options' do
+    it 'returns a hash' do
+      expected =
+        {
+          'GitHub'        => 'github',
+          'Bitbucket'     => 'bitbucket',
+          'GitLab.com'    => 'gitlab',
+          'Google Code'   => 'google_code',
+          'FogBugz'       => 'fogbugz',
+          'Repo by URL'   => 'git',
+          'GitLab export' => 'gitlab_project',
+          'Gitea'         => 'gitea'
+        }
+
+      expect(described_class.options).to eq(expected)
+    end
+  end
+
+  describe '.values' do
+    it 'returns an array' do
+      expected =
+        [
+          'github',
+          'bitbucket',
+          'gitlab',
+          'google_code',
+          'fogbugz',
+          'git',
+          'gitlab_project',
+          'gitea'
+        ]
+
+      expect(described_class.values).to eq(expected)
+    end
+  end
+
+  describe '.importer_names' do
+    it 'returns an array of importer names' do
+      expected =
+        [
+          'github',
+          'bitbucket',
+          'gitlab',
+          'google_code',
+          'fogbugz',
+          'gitlab_project',
+          'gitea'
+        ]
+
+      expect(described_class.importer_names).to eq(expected)
+    end
+  end
+
+  describe '.importer' do
+    import_sources = {
+      'github' => Gitlab::GithubImport::Importer,
+      'bitbucket' => Gitlab::BitbucketImport::Importer,
+      'gitlab' => Gitlab::GitlabImport::Importer,
+      'google_code' => Gitlab::GoogleCodeImport::Importer,
+      'fogbugz' => Gitlab::FogbugzImport::Importer,
+      'git' => nil,
+      'gitlab_project' => Gitlab::ImportExport::Importer,
+      'gitea' => Gitlab::GithubImport::Importer
+    }
+
+    import_sources.each do |name, klass|
+      it "returns #{klass} when given #{name}" do
+        expect(described_class.importer(name)).to eq(klass)
+      end
+    end
+  end
+
+  describe '.title' do
+    import_sources = {
+      'github' => 'GitHub',
+      'bitbucket' => 'Bitbucket',
+      'gitlab' => 'GitLab.com',
+      'google_code' => 'Google Code',
+      'fogbugz' => 'FogBugz',
+      'git' => 'Repo by URL',
+      'gitlab_project' => 'GitLab export',
+      'gitea' => 'Gitea'
+    }
+
+    import_sources.each do |name, title|
+      it "returns #{title} when given #{name}" do
+        expect(described_class.title(name)).to eq(title)
+      end
+    end
+  end
+end