# Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Instances.Instance do
@moduledoc "Instance."
+ @cachex Pleroma.Config.get([:cachex, :provider], Cachex)
+
alias Pleroma.Instances
alias Pleroma.Instances.Instance
alias Pleroma.Repo
+ alias Pleroma.User
+ alias Pleroma.Workers.BackgroundWorker
use Ecto.Schema
field(:host, :string)
field(:unreachable_since, :naive_datetime_usec)
field(:favicon, :string)
- field(:favicon_updated_at, :naive_datetime)
+ field(:metadata_updated_at, :naive_datetime)
+ field(:nodeinfo, :map, default: %{})
timestamps()
end
def changeset(struct, params \\ %{}) do
struct
- |> cast(params, [:host, :unreachable_since, :favicon, :favicon_updated_at])
+ |> cast(params, [:host, :unreachable_since, :favicon, :nodeinfo, :metadata_updated_at])
|> validate_required([:host])
|> unique_constraint(:host)
end
)
end
- def reachable?(_), do: true
+ def reachable?(url_or_host) when is_binary(url_or_host), do: true
def set_reachable(url_or_host) when is_binary(url_or_host) do
with host <- host(url_or_host),
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})
+ def needs_update(nil), do: true
+
+ def needs_update(%Instance{metadata_updated_at: nil}), do: true
+
+ def needs_update(%Instance{metadata_updated_at: metadata_updated_at}) do
now = NaiveDateTime.utc_now()
+ NaiveDateTime.diff(now, metadata_updated_at) > 86_400
+ end
- if existing_record && existing_record.favicon_updated_at &&
- NaiveDateTime.diff(now, existing_record.favicon_updated_at) < 86_400 do
- existing_record.favicon
+ def local do
+ %Instance{
+ host: Pleroma.Web.Endpoint.host(),
+ favicon: Pleroma.Web.Endpoint.url() <> "/favicon.png",
+ nodeinfo: Pleroma.Web.Nodeinfo.NodeinfoController.raw_nodeinfo()
+ }
+ end
+
+ def update_metadata(%URI{host: host} = uri) do
+ Logger.info("Checking metadata for #{host}")
+ existing_record = Repo.get_by(Instance, %{host: host})
+
+ if reachable?(host) do
+ do_update_metadata(uri, existing_record)
else
- favicon = scrape_favicon(instance_uri)
+ {:discard, :unreachable}
+ end
+ end
+
+ defp do_update_metadata(%URI{host: host} = uri, existing_record) do
+ if existing_record do
+ if needs_update(existing_record) do
+ Logger.info("Updating metadata for #{host}")
+ favicon = scrape_favicon(uri)
+ nodeinfo = scrape_nodeinfo(uri)
- if existing_record do
existing_record
- |> changeset(%{favicon: favicon, favicon_updated_at: now})
+ |> changeset(%{
+ host: host,
+ favicon: favicon,
+ nodeinfo: nodeinfo,
+ metadata_updated_at: NaiveDateTime.utc_now()
+ })
|> Repo.update()
else
- %Instance{}
- |> changeset(%{host: host, favicon: favicon, favicon_updated_at: now})
- |> Repo.insert()
+ {:discard, "Does not require update"}
end
+ else
+ favicon = scrape_favicon(uri)
+ nodeinfo = scrape_nodeinfo(uri)
- favicon
+ Logger.info("Creating metadata for #{host}")
+
+ {:ok, instance} =
+ %Instance{}
+ |> changeset(%{
+ host: host,
+ favicon: favicon,
+ nodeinfo: nodeinfo,
+ metadata_updated_at: NaiveDateTime.utc_now()
+ })
+ |> Repo.insert()
end
- rescue
- e ->
- Logger.warn("Instance.get_or_update_favicon(\"#{host}\") error: #{inspect(e)}")
+ end
+
+ def get_favicon(%URI{host: host}) do
+ existing_record = Repo.get_by(Instance, %{host: host})
+
+ if existing_record do
+ existing_record.favicon
+ else
nil
+ end
+ end
+
+ defp scrape_nodeinfo(%URI{} = instance_uri) do
+ with true <- Pleroma.Config.get([:instances_nodeinfo, :enabled]),
+ {_, true} <- {:reachable, reachable?(instance_uri.host)},
+ {:ok, %Tesla.Env{status: 200, body: body}} <-
+ Tesla.get(
+ "https://#{instance_uri.host}/.well-known/nodeinfo",
+ headers: [{"Accept", "application/json"}]
+ ),
+ {:ok, json} <- Jason.decode(body),
+ {:ok, %{"links" => links}} <- {:ok, json},
+ {:ok, %{"href" => href}} <-
+ {:ok,
+ Enum.find(links, &(&1["rel"] == "http://nodeinfo.diaspora.software/ns/schema/2.0"))},
+ {:ok, %Tesla.Env{body: data}} <-
+ Pleroma.HTTP.get(href, [{"accept", "application/json"}], []),
+ {:length, true} <- {:length, String.length(data) < 50_000},
+ {:ok, nodeinfo} <- Jason.decode(data) do
+ nodeinfo
+ else
+ {:reachable, false} ->
+ Logger.debug(
+ "Instance.scrape_nodeinfo(\"#{to_string(instance_uri)}\") ignored unreachable host"
+ )
+
+ nil
+
+ {:length, false} ->
+ Logger.debug(
+ "Instance.scrape_nodeinfo(\"#{to_string(instance_uri)}\") ignored too long body"
+ )
+
+ nil
+
+ _ ->
+ nil
+ end
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"}],
- pool: :media
- ),
- favicon_rel <-
- html
- |> Floki.parse_document!()
- |> Floki.attribute("link[rel=icon]", "href")
- |> List.first(),
- favicon <- URI.merge(instance_uri, favicon_rel) |> to_string(),
- true <- is_binary(favicon) do
- favicon
- else
- _ -> nil
- end
- rescue
- e ->
- Logger.warn(
- "Instance.scrape_favicon(\"#{to_string(instance_uri)}\") error: #{inspect(e)}"
+ with true <- Pleroma.Config.get([:instances_favicons, :enabled]),
+ {_, true} <- {:reachable, reachable?(instance_uri.host)},
+ {:ok, %Tesla.Env{body: html}} <-
+ Pleroma.HTTP.get(to_string(instance_uri), [{"accept", "text/html"}], []),
+ {_, [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()},
+ {:length, true} <- {:length, String.length(favicon) < 255} do
+ favicon
+ else
+ {:reachable, false} ->
+ Logger.debug(
+ "Instance.scrape_favicon(\"#{to_string(instance_uri)}\") ignored unreachable host"
)
nil
+
+ _ ->
+ nil
+ end
+ end
+
+ @doc """
+ Deletes all users from an instance in a background task, thus also deleting
+ all of those users' activities and notifications.
+ """
+ def delete_users_and_activities(host) when is_binary(host) do
+ BackgroundWorker.enqueue("delete_instance", %{"host" => host})
+ end
+
+ def perform(:delete_instance, host) when is_binary(host) do
+ User.Query.build(%{nickname: "@#{host}"})
+ |> Repo.chunk_stream(100, :batches)
+ |> Stream.each(fn users ->
+ users
+ |> Enum.each(fn user ->
+ User.perform(:delete, user)
+ end)
+ end)
+ |> Stream.run()
+ end
+
+ def get_by_url(url_or_host) do
+ url = host(url_or_host)
+ Repo.get_by(Instance, host: url)
+ end
+
+ def get_cached_by_url(url_or_host) do
+ url = host(url_or_host)
+
+ if url == Pleroma.Web.Endpoint.host() do
+ {:ok, local()}
+ else
+ @cachex.fetch!(:instances_cache, "instances:#{url}", fn _ ->
+ with %Instance{} = instance <- get_by_url(url) do
+ {:commit, {:ok, instance}}
+ else
+ _ -> {:ignore, nil}
+ end
+ end)
end
end
end
projects / akkoma / blobdiff