+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
defmodule Pleroma.Instances.Instance do
@moduledoc "Instance."
alias Pleroma.Instances
alias Pleroma.Instances.Instance
+ alias Pleroma.Repo
use Ecto.Schema
- import Ecto.{Query, Changeset}
+ import Ecto.Query
+ import Ecto.Changeset
- alias Pleroma.Repo
+ require Logger
schema "instances" do
field(:host, :string)
- field(:unreachable_since, :naive_datetime)
+ field(:unreachable_since, :naive_datetime_usec)
+ field(:favicon, :string)
+ field(:favicon_updated_at, :naive_datetime)
timestamps()
end
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
- def filter_reachable([]), do: []
+ def filter_reachable([]), do: %{}
def filter_reachable(urls_or_hosts) when is_list(urls_or_hosts) do
hosts =
|> Enum.map(&(&1 && host(&1)))
|> Enum.filter(&(to_string(&1) != ""))
- unreachable_hosts =
+ unreachable_since_by_host =
Repo.all(
from(i in Instance,
- where:
- i.host in ^hosts and
- i.unreachable_since <= ^Instances.reachability_datetime_threshold(),
- select: i.host
+ where: i.host in ^hosts,
+ select: {i.host, i.unreachable_since}
)
)
+ |> Map.new(& &1)
+
+ reachability_datetime_threshold = Instances.reachability_datetime_threshold()
- Enum.filter(urls_or_hosts, &(&1 && host(&1) not in unreachable_hosts))
+ for entry <- Enum.filter(urls_or_hosts, &is_binary/1) do
+ host = host(entry)
+ unreachable_since = unreachable_since_by_host[host]
+
+ if !unreachable_since ||
+ NaiveDateTime.compare(unreachable_since, reachability_datetime_threshold) == :gt do
+ {entry, unreachable_since}
+ end
+ end
+ |> Enum.filter(& &1)
+ |> Map.new(& &1)
end
def reachable?(url_or_host) when is_binary(url_or_host) 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})
end
def set_unreachable(_, _), do: {:error, nil}
+
+ def get_consistently_unreachable do
+ reachability_datetime_threshold = Instances.reachability_datetime_threshold()
+
+ from(i in Instance,
+ where: ^reachability_datetime_threshold > i.unreachable_since,
+ order_by: i.unreachable_since,
+ select: {i.host, i.unreachable_since}
+ )
+ |> Repo.all()
+ end
+
+ 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 {_, true} <- {:reachable, reachable?(instance_uri.host)},
+ {:ok, %Tesla.Env{body: html}} <-
+ Pleroma.HTTP.get(to_string(instance_uri), [{"accept", "text/html"}], 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
+ {:reachable, false} ->
+ Logger.debug(
+ "Instance.scrape_favicon(\"#{to_string(instance_uri)}\") ignored unreachable host"
+ )
+
+ nil
+
+ _ ->
+ nil
+ end
+ rescue
+ e ->
+ Logger.warn(
+ "Instance.scrape_favicon(\"#{to_string(instance_uri)}\") error: #{inspect(e)}"
+ )
+
+ nil
+ end
+ end
end