From 4b3f77a99ff849f7593f63f7dccd206683b34d97 Mon Sep 17 00:00:00 2001
From: Sergey Suprunenko <suprunenko.s@gmail.com>
Date: Mon, 7 Oct 2019 12:20:41 +0000
Subject: Extract RSS Feed functionality from OStatus

---
 lib/pleroma/emails/admin_email.ex                  |  2 +-
 lib/pleroma/web/feed/feed_controller.ex            | 63 ++++++++++++++++++
 lib/pleroma/web/feed/feed_view.ex                  | 77 ++++++++++++++++++++++
 lib/pleroma/web/metadata/feed.ex                   | 23 +++++++
 lib/pleroma/web/ostatus/ostatus_controller.ex      | 43 +-----------
 lib/pleroma/web/router.ex                          |  5 +-
 .../web/templates/feed/feed/_activity.xml.eex      | 48 ++++++++++++++
 .../web/templates/feed/feed/_author.xml.eex        | 17 +++++
 lib/pleroma/web/templates/feed/feed/feed.xml.eex   | 26 ++++++++
 9 files changed, 259 insertions(+), 45 deletions(-)
 create mode 100644 lib/pleroma/web/feed/feed_controller.ex
 create mode 100644 lib/pleroma/web/feed/feed_view.ex
 create mode 100644 lib/pleroma/web/metadata/feed.ex
 create mode 100644 lib/pleroma/web/templates/feed/feed/_activity.xml.eex
 create mode 100644 lib/pleroma/web/templates/feed/feed/_author.xml.eex
 create mode 100644 lib/pleroma/web/templates/feed/feed/feed.xml.eex

(limited to 'lib')

diff --git a/lib/pleroma/emails/admin_email.ex b/lib/pleroma/emails/admin_email.ex
index 5a0903c13..b15e4041b 100644
--- a/lib/pleroma/emails/admin_email.ex
+++ b/lib/pleroma/emails/admin_email.ex
@@ -17,7 +17,7 @@ defmodule Pleroma.Emails.AdminEmail do
   end
 
   defp user_url(user) do
-    Helpers.o_status_url(Pleroma.Web.Endpoint, :feed_redirect, user.id)
+    Helpers.feed_url(Pleroma.Web.Endpoint, :feed_redirect, user.id)
   end
 
   def report(to, reporter, account, statuses, comment) do
diff --git a/lib/pleroma/web/feed/feed_controller.ex b/lib/pleroma/web/feed/feed_controller.ex
new file mode 100644
index 000000000..d91ecef9c
--- /dev/null
+++ b/lib/pleroma/web/feed/feed_controller.ex
@@ -0,0 +1,63 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Feed.FeedController do
+  use Pleroma.Web, :controller
+
+  alias Fallback.RedirectController
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.ActivityPub.ActivityPubController
+
+  plug(Pleroma.Plugs.SetFormatPlug when action in [:feed_redirect])
+
+  action_fallback(:errors)
+
+  def feed_redirect(%{assigns: %{format: "html"}} = conn, %{"nickname" => nickname}) do
+    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname_or_id(nickname)} do
+      RedirectController.redirector_with_meta(conn, %{user: user})
+    end
+  end
+
+  def feed_redirect(%{assigns: %{format: format}} = conn, _params)
+      when format in ["json", "activity+json"] do
+    ActivityPubController.call(conn, :user)
+  end
+
+  def feed_redirect(conn, %{"nickname" => nickname}) do
+    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
+      redirect(conn, external: "#{feed_url(conn, :feed, user.nickname)}.atom")
+    end
+  end
+
+  def feed(conn, %{"nickname" => nickname} = params) do
+    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
+      query_params =
+        params
+        |> Map.take(["max_id"])
+        |> Map.put("type", ["Create"])
+        |> Map.put("whole_db", true)
+        |> Map.put("actor_id", user.ap_id)
+
+      activities =
+        query_params
+        |> ActivityPub.fetch_public_activities()
+        |> Enum.reverse()
+
+      conn
+      |> put_resp_content_type("application/atom+xml")
+      |> render("feed.xml", user: user, activities: activities)
+    end
+  end
+
+  def errors(conn, {:error, :not_found}) do
+    render_error(conn, :not_found, "Not found")
+  end
+
+  def errors(conn, {:fetch_user, nil}), do: errors(conn, {:error, :not_found})
+
+  def errors(conn, _) do
+    render_error(conn, :internal_server_error, "Something went wrong")
+  end
+end
diff --git a/lib/pleroma/web/feed/feed_view.ex b/lib/pleroma/web/feed/feed_view.ex
new file mode 100644
index 000000000..5eef1e757
--- /dev/null
+++ b/lib/pleroma/web/feed/feed_view.ex
@@ -0,0 +1,77 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Feed.FeedView do
+  use Phoenix.HTML
+  use Pleroma.Web, :view
+
+  alias Pleroma.Object
+  alias Pleroma.User
+  alias Pleroma.Web.MediaProxy
+
+  require Pleroma.Constants
+
+  def most_recent_update(activities, user) do
+    (List.first(activities) || user).updated_at
+    |> NaiveDateTime.to_iso8601()
+  end
+
+  def logo(user) do
+    user
+    |> User.avatar_url()
+    |> MediaProxy.url()
+  end
+
+  def last_activity(activities) do
+    List.last(activities)
+  end
+
+  def activity_object(activity) do
+    Object.normalize(activity)
+  end
+
+  def activity_object_data(activity) do
+    activity
+    |> activity_object()
+    |> Map.get(:data)
+  end
+
+  def activity_content(activity) do
+    content = activity_object_data(activity)["content"]
+
+    content
+    |> String.replace(~r/[\n\r]/, "")
+    |> escape()
+  end
+
+  def activity_context(activity) do
+    activity.data["context"]
+  end
+
+  def attachment_href(attachment) do
+    attachment["url"]
+    |> hd()
+    |> Map.get("href")
+  end
+
+  def attachment_type(attachment) do
+    attachment["url"]
+    |> hd()
+    |> Map.get("mediaType")
+  end
+
+  def get_href(id) do
+    with %Object{data: %{"external_url" => external_url}} <- Object.get_cached_by_ap_id(id) do
+      external_url
+    else
+      _e -> id
+    end
+  end
+
+  def escape(html) do
+    html
+    |> html_escape()
+    |> safe_to_string()
+  end
+end
diff --git a/lib/pleroma/web/metadata/feed.ex b/lib/pleroma/web/metadata/feed.ex
new file mode 100644
index 000000000..8043e6c54
--- /dev/null
+++ b/lib/pleroma/web/metadata/feed.ex
@@ -0,0 +1,23 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Metadata.Providers.Feed do
+  alias Pleroma.Web.Endpoint
+  alias Pleroma.Web.Metadata.Providers.Provider
+  alias Pleroma.Web.Router.Helpers
+
+  @behaviour Provider
+
+  @impl Provider
+  def build_tags(%{user: user}) do
+    [
+      {:link,
+       [
+         rel: "alternate",
+         type: "application/atom+xml",
+         href: Helpers.feed_path(Endpoint, :feed, user.nickname) <> ".atom"
+       ], []}
+    ]
+  end
+end
diff --git a/lib/pleroma/web/ostatus/ostatus_controller.ex b/lib/pleroma/web/ostatus/ostatus_controller.ex
index 8f325b28e..20f2d9ddc 100644
--- a/lib/pleroma/web/ostatus/ostatus_controller.ex
+++ b/lib/pleroma/web/ostatus/ostatus_controller.ex
@@ -9,16 +9,13 @@ defmodule Pleroma.Web.OStatus.OStatusController do
   alias Pleroma.Activity
   alias Pleroma.Object
   alias Pleroma.User
-  alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.ActivityPub.ActivityPubController
   alias Pleroma.Web.ActivityPub.ObjectView
   alias Pleroma.Web.ActivityPub.Visibility
   alias Pleroma.Web.Endpoint
   alias Pleroma.Web.Federator
   alias Pleroma.Web.Metadata.PlayerView
-  alias Pleroma.Web.OStatus
   alias Pleroma.Web.OStatus.ActivityRepresenter
-  alias Pleroma.Web.OStatus.FeedRepresenter
   alias Pleroma.Web.Router
   alias Pleroma.Web.XML
 
@@ -31,49 +28,11 @@ defmodule Pleroma.Web.OStatus.OStatusController do
 
   plug(
     Pleroma.Plugs.SetFormatPlug
-    when action in [:feed_redirect, :object, :activity, :notice]
+    when action in [:object, :activity, :notice]
   )
 
   action_fallback(:errors)
 
-  def feed_redirect(%{assigns: %{format: "html"}} = conn, %{"nickname" => nickname}) do
-    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname_or_id(nickname)} do
-      RedirectController.redirector_with_meta(conn, %{user: user})
-    end
-  end
-
-  def feed_redirect(%{assigns: %{format: format}} = conn, _params)
-      when format in ["json", "activity+json"] do
-    ActivityPubController.call(conn, :user)
-  end
-
-  def feed_redirect(conn, %{"nickname" => nickname}) do
-    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
-      redirect(conn, external: OStatus.feed_path(user))
-    end
-  end
-
-  def feed(conn, %{"nickname" => nickname} = params) do
-    with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
-      activities =
-        params
-        |> Map.take(["max_id"])
-        |> Map.merge(%{"whole_db" => true, "actor_id" => user.ap_id})
-        |> ActivityPub.fetch_public_activities()
-        |> Enum.reverse()
-
-      response =
-        user
-        |> FeedRepresenter.to_simple_form(activities, [user])
-        |> :xmerl.export_simple(:xmerl_xml)
-        |> to_string
-
-      conn
-      |> put_resp_content_type("application/atom+xml")
-      |> send_resp(200, response)
-    end
-  end
-
   defp decode_or_retry(body) do
     with {:ok, magic_key} <- Pleroma.Web.Salmon.fetch_magic_key(body),
          {:ok, doc} <- Pleroma.Web.Salmon.decode_and_validate(magic_key, body) do
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index 675f485b2..ae799b8ac 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -495,8 +495,9 @@ defmodule Pleroma.Web.Router do
     get("/activities/:uuid", OStatus.OStatusController, :activity)
     get("/notice/:id", OStatus.OStatusController, :notice)
     get("/notice/:id/embed_player", OStatus.OStatusController, :notice_player)
-    get("/users/:nickname/feed", OStatus.OStatusController, :feed)
-    get("/users/:nickname", OStatus.OStatusController, :feed_redirect)
+
+    get("/users/:nickname/feed", Feed.FeedController, :feed)
+    get("/users/:nickname", Feed.FeedController, :feed_redirect)
 
     post("/users/:nickname/salmon", OStatus.OStatusController, :salmon_incoming)
     post("/push/hub/:nickname", Websub.WebsubController, :websub_subscription_request)
diff --git a/lib/pleroma/web/templates/feed/feed/_activity.xml.eex b/lib/pleroma/web/templates/feed/feed/_activity.xml.eex
new file mode 100644
index 000000000..d1f5e903c
--- /dev/null
+++ b/lib/pleroma/web/templates/feed/feed/_activity.xml.eex
@@ -0,0 +1,48 @@
+<entry>
+  <activity:object-type>http://activitystrea.ms/schema/1.0/note</activity:object-type>
+  <activity:verb>http://activitystrea.ms/schema/1.0/post</activity:verb>
+  <id><%= @data["id"] %></id>
+  <title><%= "New note by #{@user.nickname}" %></title>
+  <content type="html"><%= activity_content(@activity) %></content>
+  <published><%= @data["published"] %></published>
+  <updated><%= @data["published"] %></updated>
+  <ostatus:conversation ref="<%= activity_context(@activity) %>"><%= activity_context(@activity) %></ostatus:conversation>
+  <link ref="<%= activity_context(@activity) %>" rel="ostatus:conversation"/>
+
+  <%= if @data["summary"] do %>
+    <summary><%= @data["summary"] %></summary>
+  <% end %>
+
+  <%= if @activity.local do %>
+    <link type="application/atom+xml" href='<%= @data["id"] %>' rel="self"/>
+    <link type="text/html" href='<%= @data["id"] %>' rel="alternate"/>
+  <% else %>
+    <link type="text/html" href='<%= @data["external_url"] %>' rel="alternate"/>
+  <% end %>
+
+  <%= for tag <- @data["tag"] || [] do %>
+    <category term="<%= tag %>"></category>
+  <% end %>
+
+  <%= for attachment <- @data["attachment"] || [] do %>
+    <link rel="enclosure" href="<%= attachment_href(attachment) %>" type="<%= attachment_type(attachment) %>"/>
+  <% end %>
+
+  <%= if @data["inReplyTo"] do %>
+    <thr:in-reply-to ref='<%= @data["inReplyTo"] %>' href='<%= get_href(@data["inReplyTo"]) %>'/>
+  <% end %>
+
+  <%= for id <- @activity.recipients do %>
+    <%= if id == Pleroma.Constants.as_public() do %>
+      <link rel="mentioned" ostatus:object-type="http://activitystrea.ms/schema/1.0/collection" href="http://activityschema.org/collection/public"/>
+    <% else %>
+      <%= unless Regex.match?(~r/^#{Pleroma.Web.base_url()}.+followers$/, id) do %>
+        <link rel="mentioned" ostatus:object-type="http://activitystrea.ms/schema/1.0/person" href="<%= id %>"/>
+      <% end %>
+    <% end %>
+  <% end %>
+
+  <%= for {emoji, file} <- @data["emoji"] || %{} do %>
+    <link name="<%= emoji %>" rel="emoji" href="<%= file %>"/>
+  <% end %>
+</entry>
diff --git a/lib/pleroma/web/templates/feed/feed/_author.xml.eex b/lib/pleroma/web/templates/feed/feed/_author.xml.eex
new file mode 100644
index 000000000..25cbffada
--- /dev/null
+++ b/lib/pleroma/web/templates/feed/feed/_author.xml.eex
@@ -0,0 +1,17 @@
+<author>
+  <id><%= @user.ap_id %></id>
+  <activity:object>http://activitystrea.ms/schema/1.0/person</activity:object>
+  <uri><%= @user.ap_id %></uri>
+  <poco:preferredUsername><%= @user.nickname %></poco:preferredUsername>
+  <poco:displayName><%= @user.name %></poco:displayName>
+  <poco:note><%= escape(@user.bio) %></poco:note>
+  <summary><%= escape(@user.bio) %></summary>
+  <name><%= @user.nickname %></name>
+  <link rel="avatar" href="<%= User.avatar_url(@user) %>"/>
+  <%= if User.banner_url(@user) do %>
+    <link rel="header" href="<%= User.banner_url(@user) %>"/>
+  <% end %>
+  <%= if @user.local do %>
+    <ap_enabled>true</ap_enabled>
+  <% end %>
+</author>
diff --git a/lib/pleroma/web/templates/feed/feed/feed.xml.eex b/lib/pleroma/web/templates/feed/feed/feed.xml.eex
new file mode 100644
index 000000000..fbfdc46b5
--- /dev/null
+++ b/lib/pleroma/web/templates/feed/feed/feed.xml.eex
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<feed
+  xmlns="http://www.w3.org/2005/Atom"
+  xmlns:thr="http://purl.org/syndication/thread/1.0"
+  xmlns:activity="http://activitystrea.ms/spec/1.0/"
+  xmlns:poco="http://portablecontacts.net/spec/1.0"
+  xmlns:ostatus="http://ostatus.org/schema/1.0">
+
+  <id><%= feed_url(@conn, :feed, @user.nickname) <> ".atom" %></id>
+  <title><%= @user.nickname <> "'s timeline" %></title>
+  <updated><%= most_recent_update(@activities, @user) %></updated>
+  <logo><%= logo(@user) %></logo>
+  <link rel="hub" href="<%= websub_url(@conn, :websub_subscription_request, @user.nickname) %>"/>
+  <link rel="salmon" href="<%= o_status_url(@conn, :salmon_incoming, @user.nickname) %>"/>
+  <link rel="self" href="<%= '#{feed_url(@conn, :feed, @user.nickname)}.atom' %>" type="application/atom+xml"/>
+
+  <%= render @view_module, "_author.xml", assigns %>
+
+  <%= if last_activity(@activities) do %>
+    <link rel="next" href="<%= '#{feed_url(@conn, :feed, @user.nickname)}.atom?max_id=#{last_activity(@activities).id}' %>" type="application/atom+xml"/>
+  <% end %>
+
+  <%= for activity <- @activities do %>
+    <%= render @view_module, "_activity.xml", Map.merge(assigns, %{activity: activity, data: activity_object_data(activity)}) %>
+  <% end %>
+</feed>
-- 
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