akkoma/lib/pleroma/web/web_finger/web_finger.ex

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defmodule Pleroma.Web.WebFinger do
alias Pleroma.XmlBuilder
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alias Pleroma.{Repo, User}
alias Pleroma.Web.{XML, Salmon, OStatus}
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require Logger
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def host_meta() do
base_url = Pleroma.Web.base_url
{
:XRD, %{ xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0" },
{
:Link, %{ rel: "lrdd", type: "application/xrd+xml", template: "#{base_url}/.well-known/webfinger?resource={uri}" }
}
}
|> XmlBuilder.to_doc
end
def webfinger(resource) do
host = Pleroma.Web.host
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regex = ~r/(acct:)?(?<username>\w+)@#{host}/
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with %{"username" => username} <- Regex.named_captures(regex, resource) do
user = User.get_by_nickname(username)
{:ok, represent_user(user)}
else _e ->
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 ->
{:error, "Couldn't find user"}
end
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end
end
def represent_user(user) do
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{:ok, user} = ensure_keys_present(user)
{:ok, _private, public} = Salmon.keys_from_pem(user.info["keys"])
magic_key = Salmon.encode_key(public)
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{
:XRD, %{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
[
{:Subject, "acct:#{user.nickname}@#{Pleroma.Web.host}"},
{:Alias, user.ap_id},
{: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: "salmon", href: OStatus.salmon_path(user)}},
{:Link, %{rel: "magic-public-key", href: "data:application/magic-public-key,#{magic_key}"}}
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]
}
|> XmlBuilder.to_doc
end
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def ensure_keys_present(user) do
info = user.info || %{}
if info["keys"] do
{:ok, user}
else
{:ok, pem} = Salmon.generate_rsa_pem
info = Map.put(info, "keys", pem)
Repo.update(Ecto.Changeset.change(user, info: info))
end
end
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# FIXME: Make this call the host-meta to find the actual address.
defp webfinger_address(domain) do
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"//#{domain}/.well-known/webfinger"
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end
defp webfinger_from_xml(doc) do
magic_key = XML.string_from_xpath(~s{//Link[@rel="magic-public-key"]/@href}, doc)
"data:application/magic-public-key," <> magic_key = magic_key
topic = XML.string_from_xpath(~s{//Link[@rel="http://schemas.google.com/g/2010#updates-from"]/@href}, doc)
subject = XML.string_from_xpath("//Subject", doc)
salmon = XML.string_from_xpath(~s{//Link[@rel="salmon"]/@href}, doc)
data = %{
magic_key: magic_key,
topic: topic,
subject: subject,
salmon: salmon
}
{:ok, data}
end
def finger(account, getter \\ &HTTPoison.get/3) do
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domain = with [_name, domain] <- String.split(account, "@") do
domain
else _e ->
URI.parse(account).host
end
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address = webfinger_address(domain)
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# try https first
response = with {:ok, result} <- getter.("https:" <> address, ["Accept": "application/xrd+xml"], [params: [resource: account]]) do
{:ok, result}
else _ ->
getter.("http:" <> address, ["Accept": "application/xrd+xml"], [params: [resource: account]])
end
with {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response,
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doc <- XML.parse_document(body),
{:ok, data} <- webfinger_from_xml(doc) do
{:ok, data}
else
e ->
Logger.debug("Couldn't finger #{account}.")
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Logger.debug(inspect(e))
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{:error, e}
end
end
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end