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lib/literature/controllers/rss_controller.ex
defmodule Literature.RSSController do
use Literature.Web, :controller
alias Atomex.Entry
alias Atomex.Feed
alias Literature.Config
@default_path "/feed"
def rss(conn, _params) do
base_path = String.replace(current_path(conn), @default_path, "")
base_url = Config.feed_url() <> base_path
publication_slug = conn.private[:publication_slug]
publication = Literature.get_publication!(slug: publication_slug)
conn
|> put_resp_content_type("text/xml")
|> send_resp(200, render_feed(base_url, publication))
end
defp render_feed(base_url, publication) do
%{
"status" => "published",
"publication_slug" => publication.slug,
"max" => 10
}
|> Literature.list_posts()
|> build_feed(publication, base_url)
end
def build_feed(posts, publication, base_url) do
Feed.new(base_url, DateTime.utc_now(), publication.name)
|> Feed.author(Config.feed_author(), email: Config.feed_email())
|> Feed.link(base_url <> @default_path, rel: "self")
|> Feed.entries(Enum.map(posts, &get_entry(base_url, &1)))
|> Feed.build()
|> Atomex.generate_document()
end
defp get_entry(base_url, %{
title: title,
slug: slug,
excerpt: excerpt,
published_at: published_at,
authors: [author | _]
}) do
post_path = "#{base_url}/#{slug}"
Entry.new(post_path, DateTime.from_naive!(published_at, "Etc/UTC"), title)
|> Entry.link(post_path)
|> Entry.author(author.name)
|> Entry.content(excerpt)
|> Entry.build()
end
end