288 lines
8.3 KiB
Elixir
288 lines
8.3 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 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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@httpoison Application.get_env(:pleroma, :httpoison)
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alias Pleroma.User
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alias Pleroma.Web
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alias Pleroma.Web.OStatus
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alias Pleroma.Web.Salmon
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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 = Web.base_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 = ~r/(acct:)?(?<username>\w+)@#{host}/
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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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def represent_user(user, "JSON") do
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{:ok, user} = ensure_keys_present(user)
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{:ok, _private, public} = Salmon.keys_from_pem(user.info.keys)
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magic_key = Salmon.encode_key(public)
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%{
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"subject" => "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}",
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"aliases" => [user.ap_id],
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"links" => [
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%{
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"rel" => "http://schemas.google.com/g/2010#updates-from",
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"type" => "application/atom+xml",
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"href" => OStatus.feed_path(user)
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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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%{"rel" => "salmon", "href" => OStatus.salmon_path(user)},
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%{
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"rel" => "magic-public-key",
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"href" => "data:application/magic-public-key,#{magic_key}"
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},
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%{"rel" => "self", "type" => "application/activity+json", "href" => user.ap_id},
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%{
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"rel" => "self",
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"type" => "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"",
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"href" => user.ap_id
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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" => OStatus.remote_follow_path()
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}
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]
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}
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end
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def represent_user(user, "XML") do
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{:ok, user} = ensure_keys_present(user)
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{:ok, _private, public} = Salmon.keys_from_pem(user.info.keys)
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magic_key = Salmon.encode_key(public)
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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}@#{Pleroma.Web.Endpoint.host()}"},
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{:Alias, user.ap_id},
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{:Link,
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%{
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rel: "http://schemas.google.com/g/2010#updates-from",
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type: "application/atom+xml",
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href: OStatus.feed_path(user)
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}},
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{:Link,
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%{rel: "http://webfinger.net/rel/profile-page", type: "text/html", href: user.ap_id}},
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{:Link, %{rel: "salmon", href: OStatus.salmon_path(user)}},
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{:Link,
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%{rel: "magic-public-key", href: "data:application/magic-public-key,#{magic_key}"}},
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{:Link, %{rel: "self", type: "application/activity+json", href: user.ap_id}},
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{:Link,
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%{rel: "http://ostatus.org/schema/1.0/subscribe", template: OStatus.remote_follow_path()}}
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]
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}
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|> XmlBuilder.to_doc()
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end
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# This seems a better fit in Salmon
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def ensure_keys_present(user) do
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info = user.info
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if info.keys do
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{:ok, user}
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else
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{:ok, pem} = Salmon.generate_rsa_pem()
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info_cng =
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info
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|> Pleroma.User.Info.set_keys(pem)
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cng =
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Ecto.Changeset.change(user)
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|> Ecto.Changeset.put_embed(:info, info_cng)
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User.update_and_set_cache(cng)
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end
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end
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defp get_magic_key(magic_key) do
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"data:application/magic-public-key," <> magic_key = magic_key
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{:ok, magic_key}
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rescue
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MatchError -> {:error, "Missing magic key data."}
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end
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defp webfinger_from_xml(doc) do
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with magic_key <- XML.string_from_xpath(~s{//Link[@rel="magic-public-key"]/@href}, doc),
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{:ok, magic_key} <- get_magic_key(magic_key),
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topic <-
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XML.string_from_xpath(
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~s{//Link[@rel="http://schemas.google.com/g/2010#updates-from"]/@href},
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doc
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),
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subject <- XML.string_from_xpath("//Subject", doc),
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salmon <- XML.string_from_xpath(~s{//Link[@rel="salmon"]/@href}, doc),
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subscribe_address <-
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XML.string_from_xpath(
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~s{//Link[@rel="http://ostatus.org/schema/1.0/subscribe"]/@template},
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doc
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),
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ap_id <-
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XML.string_from_xpath(
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~s{//Link[@rel="self" and @type="application/activity+json"]/@href},
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doc
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) do
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data = %{
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"magic_key" => magic_key,
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"topic" => topic,
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"subject" => subject,
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"salmon" => salmon,
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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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else
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{:error, e} ->
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{:error, e}
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e ->
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{:error, e}
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end
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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, "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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{_, "magic-public-key"} ->
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"data:application/magic-public-key," <> magic_key = link["href"]
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Map.put(data, "magic_key", magic_key)
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{"application/atom+xml", "http://schemas.google.com/g/2010#updates-from"} ->
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Map.put(data, "topic", link["href"])
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{_, "salmon"} ->
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Map.put(data, "salmon", link["href"])
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{_, "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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def get_template_from_xml(body) do
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xpath = "//Link[@rel='lrdd']/@template"
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with doc when doc != :error <- 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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with {:ok, %{status: status, body: body}} when status in 200..299 <-
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@httpoison.get("http://#{domain}/.well-known/host-meta", []) do
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get_template_from_xml(body)
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else
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_ ->
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with {:ok, %{body: body}} <- @httpoison.get("https://#{domain}/.well-known/host-meta", []) do
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get_template_from_xml(body)
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else
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e -> {:error, "Can't find LRDD template: #{inspect(e)}"}
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end
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end
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end
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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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address =
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case find_lrdd_template(domain) do
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{:ok, template} ->
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String.replace(template, "{uri}", URI.encode(account))
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_ ->
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"https://#{domain}/.well-known/webfinger?resource=acct:#{account}"
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end
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with response <-
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@httpoison.get(
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address,
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Accept: "application/xrd+xml,application/jrd+json"
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),
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{:ok, %{status: status, body: body}} when status in 200..299 <- response do
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doc = XML.parse_document(body)
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if doc != :error do
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webfinger_from_xml(doc)
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else
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with {:ok, doc} <- Jason.decode(body) do
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webfinger_from_json(doc)
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else
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{:error, e} -> e
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end
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end
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else
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e ->
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Logger.debug(fn -> "Couldn't finger #{account}" 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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