142 lines
3.8 KiB
Elixir
142 lines
3.8 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
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# SPDX-License-Identifier: AGPL-3.0-only
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# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/web/web_finger/web_finger.ex
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defmodule Mobilizon.Federation.WebFinger do
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@moduledoc """
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Performs the WebFinger requests and responses (JSON only).
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"""
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alias Mobilizon.Actors
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Federation.ActivityPub
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alias Mobilizon.Federation.WebFinger.XmlBuilder
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alias Mobilizon.Web.Endpoint
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alias Mobilizon.Web.Router.Helpers, as: Routes
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require Jason
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require Logger
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@http_options [
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adapter: [
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follow_redirect: true,
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ssl: [{:versions, [:"tlsv1.2"]}]
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]
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]
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def host_meta do
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base_url = Endpoint.url()
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{
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:XRD,
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%{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
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{
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:Link,
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%{
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rel: "lrdd",
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type: "application/xrd+xml",
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template: "#{base_url}/.well-known/webfinger?resource={uri}"
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}
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}
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}
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|> XmlBuilder.to_doc()
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end
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def webfinger(resource, "JSON") do
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host = Endpoint.host()
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regex = ~r/(acct:)?(?<name>\w+)@#{host}/
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with %{"name" => name} <- Regex.named_captures(regex, resource),
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%Actor{} = actor <- Actors.get_local_actor_by_name(name) do
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{:ok, represent_actor(actor, "JSON")}
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else
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_e ->
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case ActivityPub.get_or_fetch_actor_by_url(resource) do
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{:ok, %Actor{} = actor} when not is_nil(actor) ->
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{:ok, represent_actor(actor, "JSON")}
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_e ->
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{:error, "Couldn't find actor"}
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end
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end
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end
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@spec represent_actor(Actor.t()) :: struct()
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def represent_actor(actor), do: represent_actor(actor, "JSON")
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@spec represent_actor(Actor.t(), String.t()) :: struct()
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def represent_actor(actor, "JSON") do
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%{
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"subject" => "acct:#{actor.preferred_username}@#{Endpoint.host()}",
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"aliases" => [actor.url],
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"links" => [
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%{"rel" => "self", "type" => "application/activity+json", "href" => actor.url},
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%{
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"rel" => "https://webfinger.net/rel/profile-page/",
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"type" => "text/html",
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"href" => actor.url
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},
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%{
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"rel" => "http://ostatus.org/schema/1.0/subscribe",
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"template" => "#{Routes.page_url(Endpoint, :interact, uri: nil)}{uri}"
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}
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]
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}
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end
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defp webfinger_from_json(doc) do
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data =
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Enum.reduce(doc["links"], %{"subject" => doc["subject"]}, fn link, data ->
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case {link["type"], link["rel"]} do
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{"application/activity+json", "self"} ->
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Map.put(data, "url", link["href"])
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_ ->
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Logger.debug(fn ->
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"Unhandled type: #{inspect(link["type"])}"
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end)
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data
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end
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end)
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{:ok, data}
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end
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def finger(actor) do
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actor = String.trim_leading(actor, "@")
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domain =
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case String.split(actor, "@") do
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[_name, domain] ->
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domain
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_e ->
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URI.parse(actor).host
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end
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address = "http://#{domain}/.well-known/webfinger?resource=acct:#{actor}"
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Logger.debug(inspect(address))
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with false <- is_nil(domain),
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{:ok, %{} = response} <-
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Tesla.get(
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address,
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headers: [
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{"accept", "application/json, application/activity+json, application/jrd+json"}
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],
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opts: @http_options
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),
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%{status: status, body: body} when status in 200..299 <- response,
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{:ok, doc} <- Jason.decode(body) do
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webfinger_from_json(doc)
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else
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e ->
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Logger.debug(fn -> "Couldn't finger #{actor}" end)
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Logger.debug(fn -> inspect(e) end)
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{:error, e}
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end
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end
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end
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