Merge develop

[akkoma] / lib / pleroma / instances / instance.ex

diff --git a/lib/pleroma/instances/instance.ex b/lib/pleroma/instances/instance.ex
index 4d7ed4ca1076abe35b697f2e29002f739b2124c8..6948651c7bacdbba4768fe8df50a68904a5eeae5 100644 (file)
--- a/lib/pleroma/instances/instance.ex
+++ b/lib/pleroma/instances/instance.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Instances.Instance do
@@ -14,9 +14,13 @@ defmodule Pleroma.Instances.Instance do
   import Ecto.Query
   import Ecto.Changeset
 
+  require Logger
+
   schema "instances" do
     field(:host, :string)
     field(:unreachable_since, :naive_datetime_usec)
+    field(:favicon, :string)
+    field(:favicon_updated_at, :naive_datetime)
 
     timestamps()
   end
@@ -25,7 +29,7 @@ defmodule Pleroma.Instances.Instance do
 
   def changeset(struct, params \\ %{}) do
     struct
-    |> cast(params, [:host, :unreachable_since])
+    |> cast(params, [:host, :unreachable_since, :favicon, :favicon_updated_at])
     |> validate_required([:host])
     |> unique_constraint(:host)
   end
@@ -90,7 +94,7 @@ defmodule Pleroma.Instances.Instance do
   def set_unreachable(url_or_host, unreachable_since \\ nil)
 
   def set_unreachable(url_or_host, unreachable_since) when is_binary(url_or_host) do
-    unreachable_since = unreachable_since || DateTime.utc_now()
+    unreachable_since = parse_datetime(unreachable_since) || NaiveDateTime.utc_now()
     host = host(url_or_host)
     existing_record = Repo.get_by(Instance, %{host: host})
 
@@ -114,4 +118,63 @@ defmodule Pleroma.Instances.Instance do
   end
 
   def set_unreachable(_, _), do: {:error, nil}
+
+  defp parse_datetime(datetime) when is_binary(datetime) do
+    NaiveDateTime.from_iso8601(datetime)
+  end
+
+  defp parse_datetime(datetime), do: datetime
+
+  def get_or_update_favicon(%URI{host: host} = instance_uri) do
+    existing_record = Repo.get_by(Instance, %{host: host})
+    now = NaiveDateTime.utc_now()
+
+    if existing_record && existing_record.favicon_updated_at &&
+         NaiveDateTime.diff(now, existing_record.favicon_updated_at) < 86_400 do
+      existing_record.favicon
+    else
+      favicon = scrape_favicon(instance_uri)
+
+      if existing_record do
+        existing_record
+        |> changeset(%{favicon: favicon, favicon_updated_at: now})
+        |> Repo.update()
+      else
+        %Instance{}
+        |> changeset(%{host: host, favicon: favicon, favicon_updated_at: now})
+        |> Repo.insert()
+      end
+
+      favicon
+    end
+  rescue
+    e ->
+      Logger.warn("Instance.get_or_update_favicon(\"#{host}\") error: #{inspect(e)}")
+      nil
+  end
+
+  defp scrape_favicon(%URI{} = instance_uri) do
+    try do
+      with {:ok, %Tesla.Env{body: html}} <-
+             Pleroma.HTTP.get(to_string(instance_uri), [{"accept", "text/html"}],
+               adapter: [pool: :media]
+             ),
+           {_, [favicon_rel | _]} when is_binary(favicon_rel) <-
+             {:parse,
+              html |> Floki.parse_document!() |> Floki.attribute("link[rel=icon]", "href")},
+           {_, favicon} when is_binary(favicon) <-
+             {:merge, URI.merge(instance_uri, favicon_rel) |> to_string()} do
+        favicon
+      else
+        _ -> nil
+      end
+    rescue
+      e ->
+        Logger.warn(
+          "Instance.scrape_favicon(\"#{to_string(instance_uri)}\") error: #{inspect(e)}"
+        )
+
+        nil
+    end
+  end
 end