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07a48b9293
Co-authored-by: FloatingGhost <hannah@coffee-and-dreams.uk> Reviewed-on: https://akkoma.dev/AkkomaGang/akkoma/pulls/371
227 lines
6.2 KiB
Elixir
227 lines
6.2 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.WebFinger do
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alias Pleroma.HTTP
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alias Pleroma.User
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alias Pleroma.Web.Endpoint
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alias Pleroma.Web.Federator.Publisher
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alias Pleroma.Web.XML
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alias Pleroma.XmlBuilder
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require Jason
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require Logger
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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, fmt) when fmt in ["XML", "JSON"] do
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host = Pleroma.Web.Endpoint.host()
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regex =
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if webfinger_domain = Pleroma.Config.get([__MODULE__, :domain]) do
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~r/(acct:)?(?<username>[a-z0-9A-Z_\.-]+)@(#{host}|#{webfinger_domain})/
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else
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~r/(acct:)?(?<username>[a-z0-9A-Z_\.-]+)@#{host}/
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end
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with %{"username" => username} <- Regex.named_captures(regex, resource),
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%User{} = user <- User.get_cached_by_nickname(username) do
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{:ok, represent_user(user, fmt)}
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else
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_e ->
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with %User{} = user <- User.get_cached_by_ap_id(resource) do
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{:ok, represent_user(user, fmt)}
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else
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_e ->
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{:error, "Couldn't find user"}
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end
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end
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end
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defp gather_links(%User{} = user) do
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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" => user.ap_id
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}
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] ++ Publisher.gather_webfinger_links(user)
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end
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defp gather_aliases(%User{} = user) do
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[user.ap_id | user.also_known_as]
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end
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def represent_user(user, "JSON") do
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%{
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"subject" => "acct:#{user.nickname}@#{domain()}",
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"aliases" => gather_aliases(user),
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"links" => gather_links(user)
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}
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end
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def represent_user(user, "XML") do
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aliases =
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user
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|> gather_aliases()
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|> Enum.map(&{:Alias, &1})
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links =
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gather_links(user)
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|> Enum.map(fn link -> {:Link, link} end)
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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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{:Subject, "acct:#{user.nickname}@#{domain()}"}
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] ++ aliases ++ links
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}
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|> XmlBuilder.to_doc()
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end
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defp domain do
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Pleroma.Config.get([__MODULE__, :domain]) || Pleroma.Web.Endpoint.host()
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end
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@spec webfinger_from_xml(binary()) :: {:ok, map()} | nil
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defp webfinger_from_xml(body) do
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with {:ok, doc} <- XML.parse_document(body) do
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subject = XML.string_from_xpath("//Subject", doc)
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subscribe_address =
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~s{//Link[@rel="http://ostatus.org/schema/1.0/subscribe"]/@template}
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|> XML.string_from_xpath(doc)
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ap_id =
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~s{//Link[@rel="self" and @type="application/activity+json"]/@href}
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|> XML.string_from_xpath(doc)
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data = %{
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"subject" => subject,
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"subscribe_address" => subscribe_address,
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"ap_id" => ap_id
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}
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{:ok, data}
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end
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end
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defp webfinger_from_json(body) do
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with {:ok, doc} <- Jason.decode(body) 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, "ap_id", link["href"])
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{"application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"", "self"} ->
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Map.put(data, "ap_id", link["href"])
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{nil, "http://ostatus.org/schema/1.0/subscribe"} ->
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Map.put(data, "subscribe_address", link["template"])
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_ ->
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Logger.debug("Unhandled type: #{inspect(link["type"])}")
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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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end
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def get_template_from_xml(body) do
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xpath = "//Link[@rel='lrdd']/@template"
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with {:ok, doc} <- XML.parse_document(body),
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template when template != nil <- XML.string_from_xpath(xpath, doc) do
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{:ok, template}
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end
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end
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def find_lrdd_template(domain) do
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# WebFinger is restricted to HTTPS - https://tools.ietf.org/html/rfc7033#section-9.1
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meta_url = "https://#{domain}/.well-known/host-meta"
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with {:ok, %{status: status, body: body}} when status in 200..299 <- HTTP.get(meta_url) do
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get_template_from_xml(body)
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else
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error ->
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Logger.warn("Can't find LRDD template in #{inspect(meta_url)}: #{inspect(error)}")
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{:error, :lrdd_not_found}
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end
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end
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defp get_address_from_domain(domain, encoded_account) when is_binary(domain) do
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case find_lrdd_template(domain) do
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{:ok, template} ->
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String.replace(template, "{uri}", encoded_account)
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_ ->
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"https://#{domain}/.well-known/webfinger?resource=#{encoded_account}"
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end
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end
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defp get_address_from_domain(_, _), do: {:error, :webfinger_no_domain}
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@spec finger(String.t()) :: {:ok, map()} | {:error, any()}
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def finger(account) do
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account = String.trim_leading(account, "@")
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domain =
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with [_name, domain] <- String.split(account, "@") do
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domain
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else
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_e ->
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URI.parse(account).host
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end
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encoded_account = URI.encode("acct:#{account}")
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with address when is_binary(address) <- get_address_from_domain(domain, encoded_account),
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{:ok, %{status: status, body: body, headers: headers}} when status in 200..299 <-
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HTTP.get(
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address,
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[{"accept", "application/xrd+xml,application/jrd+json"}]
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) do
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case List.keyfind(headers, "content-type", 0) do
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{_, content_type} ->
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case Plug.Conn.Utils.media_type(content_type) do
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{:ok, "application", subtype, _} when subtype in ~w(xrd+xml xml) ->
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webfinger_from_xml(body)
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{:ok, "application", subtype, _} when subtype in ~w(jrd+json json) ->
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webfinger_from_json(body)
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_ ->
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{:error, {:content_type, content_type}}
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end
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_ ->
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{:error, {:content_type, nil}}
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end
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else
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error ->
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Logger.debug("Couldn't finger #{account}: #{inspect(error)}")
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error
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end
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end
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end
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