275 lines
8.5 KiB
Elixir
275 lines
8.5 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.Actor, as: ActivityPubActor
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alias Mobilizon.Federation.WebFinger.XmlBuilder
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alias Mobilizon.Service.HTTP.{HostMetaClient, WebfingerClient}
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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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import SweetXml
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@doc """
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Returns the Web Host Metadata (for `/.well-known/host-meta`) representation for the instance, following RFC6414.
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"""
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@spec host_meta :: String.t()
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def host_meta do
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base_url = Endpoint.url()
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%URI{host: host} = URI.parse(base_url)
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XmlBuilder.to_doc({
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:XRD,
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%{
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xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0",
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"xmlns:hm": "http://host-meta.net/ns/1.0"
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},
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[
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{
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:"hm:Host",
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host
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},
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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/jrd+json",
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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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})
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end
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@doc """
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Returns the Webfinger representation for the instance, following RFC7033.
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"""
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@spec webfinger(String.t(), String.t()) :: {:ok, map} | {:error, :actor_not_found}
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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 ActivityPubActor.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, :actor_not_found}
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end
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end
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end
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@doc """
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Return an `Mobilizon.Actors.Actor` Webfinger representation (as JSON)
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"""
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@spec represent_actor(Actor.t()) :: map()
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@spec represent_actor(Actor.t(), String.t()) :: map()
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def represent_actor(%Actor{} = actor), do: represent_actor(actor, "JSON")
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def represent_actor(%Actor{} = actor, "JSON") do
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links =
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[
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%{"rel" => "self", "type" => "application/activity+json", "href" => actor.url},
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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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|> maybe_add_avatar(actor)
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|> maybe_add_profile_page(actor)
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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" => links
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}
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end
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@spec maybe_add_avatar(list(map()), Actor.t()) :: list(map())
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defp maybe_add_avatar(data, %Actor{avatar: avatar}) when not is_nil(avatar) do
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data ++
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[
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%{
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"rel" => "http://webfinger.net/rel/avatar",
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"type" => avatar.content_type,
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"href" => avatar.url
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}
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]
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end
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defp maybe_add_avatar(data, _actor), do: data
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@spec maybe_add_profile_page(list(map()), Actor.t()) :: list(map())
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defp maybe_add_profile_page(data, %Actor{type: :Group, url: url}) do
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data ++
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[
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%{
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"rel" => "http://webfinger.net/rel/profile-page/",
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"type" => "text/html",
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"href" => url
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}
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]
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end
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defp maybe_add_profile_page(data, _actor), do: data
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@type finger_errors ::
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:host_not_found | :address_invalid | :http_error | :webfinger_information_not_json
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@doc """
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Finger an actor to retreive it's ActivityPub ID/URL
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Fetches the Extensible Resource Descriptor endpoint `/.well-known/host-meta` to find the Webfinger endpoint (usually `/.well-known/webfinger?resource=`) and then performs a Webfinger query to get the ActivityPub ID associated to an actor.
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"""
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@spec finger(String.t()) ::
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{:ok, String.t()}
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| {:error, finger_errors}
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def finger(actor) do
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actor = String.trim_leading(actor, "@")
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case validate_endpoint(actor) do
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{:ok, address} ->
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case fetch_webfinger_data(address) do
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{:ok, %{"url" => url}} ->
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{:ok, url}
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{:error, err} ->
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Logger.debug("Couldn't process webfinger data for #{actor}")
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{:error, err}
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end
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{:error, err} ->
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Logger.debug("Couldn't find webfinger endpoint for #{actor}")
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{:error, err}
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end
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end
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@spec fetch_webfinger_data(String.t()) ::
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{:ok, map()} | {:error, :webfinger_information_not_json | :http_error}
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defp fetch_webfinger_data(address) do
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case WebfingerClient.get(address) do
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{:ok, %{body: body, status: code}} when code in 200..299 ->
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webfinger_from_json(body)
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_ ->
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{:error, :http_error}
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end
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end
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@spec validate_endpoint(String.t()) ::
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{:ok, String.t()} | {:error, :address_invalid | :host_not_found}
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defp validate_endpoint(actor) do
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case apply_webfinger_endpoint(actor) do
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address when is_binary(address) ->
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if address_invalid(address) do
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{:error, :address_invalid}
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else
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{:ok, address}
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end
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_ ->
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{:error, :host_not_found}
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end
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end
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# Fetches the Extensible Resource Descriptor endpoint `/.well-known/host-meta`
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# to find the Webfinger endpoint (usually `/.well-known/webfinger?resource=`)
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@spec find_webfinger_endpoint(String.t()) ::
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{:ok, String.t()} | {:error, :link_not_found} | {:error, any()}
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defp find_webfinger_endpoint(domain) when is_binary(domain) do
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with {:ok, %{body: body}} <- fetch_document("http://#{domain}/.well-known/host-meta"),
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link_template when is_binary(link_template) <- find_link_from_template(body) do
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{:ok, link_template}
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else
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{:error, :link_not_found} -> {:error, :link_not_found}
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{:error, error} -> {:error, error}
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end
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end
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@spec apply_webfinger_endpoint(String.t()) :: String.t() | {:error, :host_not_found}
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defp apply_webfinger_endpoint(actor) do
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with {:ok, domain} <- domain_from_federated_actor(actor) do
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case find_webfinger_endpoint(domain) do
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{:ok, link_template} ->
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String.replace(link_template, "{uri}", "acct:#{actor}")
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_ ->
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"http://#{domain}/.well-known/webfinger?resource=acct:#{actor}"
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end
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end
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end
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@spec domain_from_federated_actor(String.t()) :: {:ok, String.t()} | {:error, :host_not_found}
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defp domain_from_federated_actor(actor) do
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case String.split(actor, "@") do
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[_name, domain] ->
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{:ok, domain}
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_e ->
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host = URI.parse(actor).host
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if is_nil(host), do: {:error, :host_not_found}, else: {:ok, host}
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end
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end
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@spec webfinger_from_json(map() | String.t()) ::
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{:ok, map()} | {:error, :webfinger_information_not_json}
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defp webfinger_from_json(doc) when is_map(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 to finger: #{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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defp webfinger_from_json(_doc), do: {:error, :webfinger_information_not_json}
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@spec find_link_from_template(String.t()) :: String.t() | {:error, :link_not_found}
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defp find_link_from_template(doc) do
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with res when res in [nil, ""] <-
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xpath(doc, ~x"//Link[@rel=\"lrdd\"][@type=\"application/json\"]/@template"s),
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res when res in [nil, ""] <- xpath(doc, ~x"//Link[@rel=\"lrdd\"]/@template"s),
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do: {:error, :link_not_found}
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catch
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:exit, _e ->
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{:error, :link_not_found}
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end
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@spec fetch_document(String.t()) :: Tesla.Env.result()
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defp fetch_document(endpoint) do
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with {:error, err} <- HostMetaClient.get(endpoint), do: {:error, err}
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end
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@spec address_invalid(String.t()) :: false | {:error, :invalid_address}
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defp address_invalid(address) do
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with %URI{host: host, scheme: scheme} <- URI.parse(address),
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true <- is_nil(host) or is_nil(scheme) do
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{:error, :invalid_address}
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end
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end
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end
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