122 lines
4.2 KiB
Elixir
122 lines
4.2 KiB
Elixir
defmodule Pleroma.Web.WebFinger do
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@httpoison Application.get_env(:pleroma, :httpoison)
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alias Pleroma.{Repo, User, XmlBuilder}
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alias Pleroma.Web
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alias Pleroma.Web.{XML, Salmon, OStatus}
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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, %{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
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{
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:Link, %{rel: "lrdd", type: "application/xrd+xml", template: "#{base_url}/.well-known/webfinger?resource={uri}"}
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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) 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) do
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user = User.get_by_nickname(username)
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{:ok, represent_user(user)}
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else _e ->
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with user when not is_nil(user) <- User.get_cached_by_ap_id(resource) do
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{:ok, represent_user(user)}
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else _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) 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, %{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, %{rel: "http://schemas.google.com/g/2010#updates-from", type: "application/atom+xml", href: OStatus.feed_path(user)}},
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{:Link, %{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, %{rel: "magic-public-key", href: "data:application/magic-public-key,#{magic_key}"}}
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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 = Map.put(info, "keys", pem)
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Repo.update(Ecto.Changeset.change(user, info: info))
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end
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end
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defp webfinger_from_xml(doc) do
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magic_key = XML.string_from_xpath(~s{//Link[@rel="magic-public-key"]/@href}, doc)
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"data:application/magic-public-key," <> magic_key = magic_key
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topic = XML.string_from_xpath(~s{//Link[@rel="http://schemas.google.com/g/2010#updates-from"]/@href}, doc)
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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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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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}
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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' and @type='application/xrd+xml']/@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_code: status_code, body: body}} when status_code in 200..299 <- @httpoison.get("http://#{domain}/.well-known/host-meta", [], follow_redirect: true) 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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domain = with [_name, domain] <- String.split(account, "@") do
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domain
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else _e ->
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URI.parse(account).host
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end
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with {:ok, template} <- find_lrdd_template(domain),
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address <- String.replace(template, "{uri}", URI.encode(account)),
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response <- @httpoison.get(address, ["Accept": "application/xrd+xml"]),
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{:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response,
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doc when doc != :error<- XML.parse_document(body),
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{:ok, data} <- webfinger_from_xml(doc) do
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{:ok, data}
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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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