10 files changed, 126 insertions, 20 deletions
diff --git a/lib/pleroma/web/controller_helper.ex b/lib/pleroma/web/controller_helper.ex
index 9a4e322c9..e3d7a465b 100644
--- a/lib/pleroma/web/controller_helper.ex
+++ b/lib/pleroma/web/controller_helper.ex
@@ -76,8 +76,7 @@ defmodule Pleroma.Web.ControllerHelper do
     end
   end
 
-  def try_render(conn, target, params)
-      when is_binary(target) do
+  def try_render(conn, target, params) when is_binary(target) do
     case render(conn, target, params) do
       nil -> render_error(conn, :not_implemented, "Can't display this activity")
       res -> res
@@ -87,4 +86,8 @@ defmodule Pleroma.Web.ControllerHelper do
   def try_render(conn, _, _) do
     render_error(conn, :not_implemented, "Can't display this activity")
   end
+
+  @spec put_in_if_exist(map(), atom() | String.t(), any) :: map()
+  def put_in_if_exist(map, _key, nil), do: map
+  def put_in_if_exist(map, key, value), do: put_in(map, key, value)
 end
diff --git a/lib/pleroma/web/feed/feed_view.ex b/lib/pleroma/web/feed/feed_view.ex
index bb1332fd3..2e7db1ebb 100644
--- a/lib/pleroma/web/feed/feed_view.ex
+++ b/lib/pleroma/web/feed/feed_view.ex
@@ -13,6 +13,15 @@ defmodule Pleroma.Web.Feed.FeedView do
 
   require Pleroma.Constants
 
+  @spec pub_date(String.t() | DateTime.t()) :: String.t()
+  def pub_date(date) when is_binary(date) do
+    date
+    |> Timex.parse!("{ISO:Extended}")
+    |> pub_date
+  end
+
+  def pub_date(%DateTime{} = date), do: Timex.format!(date, "{RFC822}")
+
   def prepare_activity(activity) do
     object = activity_object(activity)
 
@@ -28,6 +37,17 @@ defmodule Pleroma.Web.Feed.FeedView do
     |> NaiveDateTime.to_iso8601()
   end
 
+  def feed_logo do
+    case Pleroma.Config.get([:feed, :logo]) do
+      nil ->
+        "#{Pleroma.Web.base_url()}/static/logo.png"
+
+      logo ->
+        "#{Pleroma.Web.base_url()}#{logo}"
+    end
+    |> MediaProxy.url()
+  end
+
   def logo(user) do
     user
     |> User.avatar_url()
@@ -40,6 +60,8 @@ defmodule Pleroma.Web.Feed.FeedView do
 
   def activity_title(%{data: %{"content" => content}}, opts \\ %{}) do
     content
+    |> Pleroma.Web.Metadata.Utils.scrub_html()
+    |> Pleroma.Emoji.Formatter.demojify()
     |> Formatter.truncate(opts[:max_length], opts[:omission])
     |> escape()
   end
@@ -50,6 +72,8 @@ defmodule Pleroma.Web.Feed.FeedView do
     |> escape()
   end
 
+  def activity_content(_), do: ""
+
   def activity_context(activity), do: activity.data["context"]
 
   def attachment_href(attachment) do
diff --git a/lib/pleroma/web/feed/tag_controller.ex b/lib/pleroma/web/feed/tag_controller.ex
new file mode 100644
index 000000000..97ce147de
--- /dev/null
+++ b/lib/pleroma/web/feed/tag_controller.ex
@@ -0,0 +1,40 @@
+# 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.TagController do
+  use Pleroma.Web, :controller
+
+  alias Pleroma.Config
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.Feed.FeedView
+
+  import Pleroma.Web.ControllerHelper, only: [put_in_if_exist: 3]
+
+  def feed(conn, %{"tag" => raw_tag} = params) do
+    tag = parse_tag(raw_tag)
+
+    activities =
+      %{"type" => ["Create"], "whole_db" => true, "tag" => tag}
+      |> put_in_if_exist("max_id", params["max_id"])
+      |> ActivityPub.fetch_public_activities()
+
+    conn
+    |> put_resp_content_type("application/atom+xml")
+    |> put_view(FeedView)
+    |> render("tag.xml",
+      activities: activities,
+      tag: tag,
+      feed_config: Config.get([:feed])
+    )
+  end
+
+  defp parse_tag(raw_tag) when is_binary(raw_tag) do
+    case Enum.reverse(String.split(raw_tag, ".")) do
+      [format | tag] when format in ["atom", "rss"] -> Enum.join(tag, ".")
+      _ -> raw_tag
+    end
+  end
+
+  defp parse_tag(raw_tag), do: raw_tag
+end
diff --git a/lib/pleroma/web/feed/feed_controller.ex b/lib/pleroma/web/feed/user_controller.ex
index d0e23007d..cf04fd497 100644
--- a/lib/pleroma/web/feed/feed_controller.ex
+++ b/lib/pleroma/web/feed/user_controller.ex
@@ -2,13 +2,16 @@
 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
-defmodule Pleroma.Web.Feed.FeedController do
+defmodule Pleroma.Web.Feed.UserController do
   use Pleroma.Web, :controller
 
   alias Fallback.RedirectController
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.ActivityPub.ActivityPubController
+  alias Pleroma.Web.Feed.FeedView
+
+  import Pleroma.Web.ControllerHelper, only: [put_in_if_exist: 3]
 
   plug(Pleroma.Plugs.SetFormatPlug when action in [:feed_redirect])
 
@@ -27,24 +30,21 @@ defmodule Pleroma.Web.Feed.FeedController do
 
   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")
+      redirect(conn, external: "#{user_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
       activities =
-        %{
-          "type" => ["Create"],
-          "whole_db" => true,
-          "actor_id" => user.ap_id
-        }
-        |> Map.merge(Map.take(params, ["max_id"]))
+        %{"type" => ["Create"], "whole_db" => true, "actor_id" => user.ap_id}
+        |> put_in_if_exist("max_id", params["max_id"])
         |> ActivityPub.fetch_public_activities()
 
       conn
       |> put_resp_content_type("application/atom+xml")
-      |> render("feed.xml",
+      |> put_view(FeedView)
+      |> render("user.xml",
         user: user,
         activities: activities,
         feed_config: Pleroma.Config.get([:feed])
diff --git a/lib/pleroma/web/metadata/feed.ex b/lib/pleroma/web/metadata/feed.ex
index 8043e6c54..ee48913a7 100644
--- a/lib/pleroma/web/metadata/feed.ex
+++ b/lib/pleroma/web/metadata/feed.ex
@@ -16,7 +16,7 @@ defmodule Pleroma.Web.Metadata.Providers.Feed do
        [
          rel: "alternate",
          type: "application/atom+xml",
-         href: Helpers.feed_path(Endpoint, :feed, user.nickname) <> ".atom"
+         href: Helpers.user_feed_path(Endpoint, :feed, user.nickname) <> ".atom"
        ], []}
     ]
   end
diff --git a/lib/pleroma/web/metadata/utils.ex b/lib/pleroma/web/metadata/utils.ex
index 589d11901..000bd9f66 100644
--- a/lib/pleroma/web/metadata/utils.ex
+++ b/lib/pleroma/web/metadata/utils.ex
@@ -21,15 +21,22 @@ defmodule Pleroma.Web.Metadata.Utils do
 
   def scrub_html_and_truncate(content, max_length \\ 200) when is_binary(content) do
     content
+    |> scrub_html
+    |> Emoji.Formatter.demojify()
+    |> HtmlEntities.decode()
+    |> Formatter.truncate(max_length)
+  end
+
+  def scrub_html(content) when is_binary(content) do
+    content
     # html content comes from DB already encoded, decode first and scrub after
     |> HtmlEntities.decode()
     |> String.replace(~r/<br\s?\/?>/, " ")
     |> HTML.strip_tags()
-    |> Emoji.Formatter.demojify()
-    |> HtmlEntities.decode()
-    |> Formatter.truncate(max_length)
   end
 
+  def scrub_html(content), do: content
+
   def attachment_url(url) do
     MediaProxy.url(url)
   end
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index 9654ab8a3..787d300fb 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -527,8 +527,10 @@ defmodule Pleroma.Web.Router do
     get("/notice/:id", OStatus.OStatusController, :notice)
     get("/notice/:id/embed_player", OStatus.OStatusController, :notice_player)
 
-    get("/users/:nickname/feed", Feed.FeedController, :feed)
-    get("/users/:nickname", Feed.FeedController, :feed_redirect)
+    get("/users/:nickname/feed", Feed.UserController, :feed, as: :user_feed)
+    get("/users/:nickname", Feed.UserController, :feed_redirect, as: :user_feed)
+
+    get("/tags/:tag", Feed.TagController, :feed, as: :tag_feed)
   end
 
   scope "/", Pleroma.Web do
diff --git a/lib/pleroma/web/templates/feed/feed/_tag_activity.xml.eex b/lib/pleroma/web/templates/feed/feed/_tag_activity.xml.eex
new file mode 100644
index 000000000..295574df1
--- /dev/null
+++ b/lib/pleroma/web/templates/feed/feed/_tag_activity.xml.eex
@@ -0,0 +1,15 @@
+<item>
+  <title><%= activity_title(@object, Keyword.get(@feed_config, :post_title, %{})) %></title>
+  
+  
+  <guid isPermalink="true"><%= activity_context(@activity) %></guid>
+  <link><%= activity_context(@activity) %></link>
+  <pubDate><%= pub_date(@data["published"]) %></pubDate>
+  
+  <description><%= activity_content(@object) %></description>
+  <%= for attachment <- @data["attachment"] || [] do %>
+    <enclosure url="<%= attachment_href(attachment) %>" type="<%= attachment_type(attachment) %>"/>
+  <% end %>
+  
+</item>
+
diff --git a/lib/pleroma/web/templates/feed/feed/tag.xml.eex b/lib/pleroma/web/templates/feed/feed/tag.xml.eex
new file mode 100644
index 000000000..eeda01a04
--- /dev/null
+++ b/lib/pleroma/web/templates/feed/feed/tag.xml.eex
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0" xmlns:webfeeds="http://webfeeds.org/rss/1.0">
+  <channel>
+
+
+    <title>#<%= @tag %></title>
+    <description>These are public toots tagged with #<%= @tag %>. You can interact with them if you have an account anywhere in the fediverse.</description>
+    <link><%= '#{tag_feed_url(@conn, :feed, @tag)}.rss' %></link>
+    <webfeeds:logo><%= feed_logo() %></webfeeds:logo>
+    <webfeeds:accentColor>2b90d9</webfeeds:accentColor>
+    <%= for activity <- @activities do %>
+    <%= render @view_module, "_tag_activity.xml", Map.merge(assigns, prepare_activity(activity)) %>
+    <% end %>
+  </channel>
+</rss>
diff --git a/lib/pleroma/web/templates/feed/feed/feed.xml.eex b/lib/pleroma/web/templates/feed/feed/user.xml.eex
index 5ae36d345..d274c08ae 100644
--- a/lib/pleroma/web/templates/feed/feed/feed.xml.eex
+++ b/lib/pleroma/web/templates/feed/feed/user.xml.eex
@@ -6,16 +6,16 @@
   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>
+  <id><%= user_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="self" href="<%= '#{feed_url(@conn, :feed, @user.nickname)}.atom' %>" type="application/atom+xml"/>
+  <link rel="self" href="<%= '#{user_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"/>
+    <link rel="next" href="<%= '#{user_feed_url(@conn, :feed, @user.nickname)}.atom?max_id=#{last_activity(@activities).id}' %>" type="application/atom+xml"/>
   <% end %>
 
   <%= for activity <- @activities do %>