95 lines
2.5 KiB
Elixir
95 lines
2.5 KiB
Elixir
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defmodule Eventos.Service.WebFinger do
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alias Eventos.Accounts
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alias Eventos.Service.XmlBuilder
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alias Eventos.Repo
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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 = EventosWeb.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, "JSON") do
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host = EventosWeb.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 = Accounts.get_account_by_username(username)
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{:ok, represent_user(user, "JSON")}
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else
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_e ->
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with user when not is_nil(user) <- Accounts.get_account_by_url(resource) do
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{:ok, represent_user(user, "JSON")}
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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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%{
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"subject" => "acct:#{user.username}@#{EventosWeb.Endpoint.host() <> ":4001"}",
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"aliases" => [user.url],
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"links" => [
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%{"rel" => "self", "type" => "application/activity+json", "href" => user.url},
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]
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}
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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, "url", link["href"])
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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 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 = "http://#{domain}/.well-known/webfinger?resource=acct:#{account}"
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with response <- HTTPoison.get(address, [Accept: "application/json"],follow_redirect: true),
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{:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response do
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{:ok, doc} = Jason.decode(body)
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webfinger_from_json(doc)
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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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