1 files changed, 75 insertions, 0 deletions
diff --git a/app/presenters/packages/pypi/package_presenter.rb b/app/presenters/packages/pypi/package_presenter.rb
new file mode 100644
index 00000000000..4192e974645
--- /dev/null
+++ b/app/presenters/packages/pypi/package_presenter.rb
@@ -0,0 +1,75 @@
+# frozen_string_literal: true
+
+# Display package version data acording to PyPi
+# Simple API: https://warehouse.pypa.io/api-reference/legacy/#simple-project-api
+module Packages
+  module Pypi
+    class PackagePresenter
+      include API::Helpers::RelatedResourcesHelpers
+
+      def initialize(packages, project)
+        @packages = packages
+        @project = project
+      end
+
+      # Returns the HTML body for PyPi simple API.
+      # Basically a list of package download links for a specific
+      # package
+      def body
+        <<-HTML
+        <!DOCTYPE html>
+        <html>
+          <head>
+            <title>Links for #{escape(name)}</title>
+          </head>
+          <body>
+            <h1>Links for #{escape(name)}</h1>
+            #{links}
+          </body>
+        </html>
+        HTML
+      end
+
+      private
+
+      def links
+        refs = []
+
+        @packages.map do |package|
+          package.package_files.each do |file|
+            url = build_pypi_package_path(file)
+
+            refs << package_link(url, package.pypi_metadatum.required_python, file.file_name)
+          end
+        end
+
+        refs.join
+      end
+
+      def package_link(url, required_python, filename)
+        "<a href=\"#{url}\" data-requires-python=\"#{escape(required_python)}\">#{filename}</a><br>"
+      end
+
+      def build_pypi_package_path(file)
+        expose_url(
+          api_v4_projects_packages_pypi_files_file_identifier_path(
+            {
+              id: @project.id,
+              sha256: file.file_sha256,
+              file_identifier: file.file_name
+            },
+            true
+          )
+        ) + "#sha256=#{file.file_sha256}"
+      end
+
+      def name
+        @packages.first.name
+      end
+
+      def escape(str)
+        ERB::Util.html_escape(str)
+      end
+    end
+  end
+end