git.squeep.com Git - akkoma/blob - lib/pleroma/web/oauth/oauth_controller.ex

   1 defmodule Pleroma.Web.OAuth.OAuthController do
   2   use Pleroma.Web, :controller
   3
   4   alias Pleroma.Web.OAuth.{Authorization, Token, App}
   5   alias Pleroma.{Repo, User}
   6   alias Comeonin.Pbkdf2
   7
   8   plug(:fetch_session)
   9   plug(:fetch_flash)
  10
  11   action_fallback(Pleroma.Web.OAuth.FallbackController)
  12
  13   def authorize(conn, params) do
  14     render(conn, "show.html", %{
  15       response_type: params["response_type"],
  16       client_id: params["client_id"],
  17       scope: params["scope"],
  18       redirect_uri: params["redirect_uri"],
  19       state: params["state"]
  20     })
  21   end
  22
  23   def create_authorization(conn, %{
  24         "authorization" =>
  25           %{
  26             "name" => name,
  27             "password" => password,
  28             "client_id" => client_id,
  29             "redirect_uri" => redirect_uri
  30           } = params
  31       }) do
  32     with %User{} = user <- User.get_by_nickname_or_email(name),
  33          true <- Pbkdf2.checkpw(password, user.password_hash),
  34          %App{} = app <- Repo.get_by(App, client_id: client_id),
  35          {:ok, auth} <- Authorization.create_authorization(app, user) do
  36       if redirect_uri == "urn:ietf:wg:oauth:2.0:oob" do
  37         render(conn, "results.html", %{
  38           auth: auth
  39         })
  40       else
  41         connector = if String.contains?(redirect_uri, "?"), do: "&", else: "?"
  42         url = "#{redirect_uri}#{connector}code=#{auth.token}"
  43
  44         url =
  45           if params["state"] do
  46             url <> "&state=#{params["state"]}"
  47           else
  48             url
  49           end
  50
  51         redirect(conn, external: url)
  52       end
  53     end
  54   end
  55
  56   # TODO
  57   # - proper scope handling
  58   def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
  59     with %App{} = app <- get_app_from_request(conn, params),
  60          fixed_token = fix_padding(params["code"]),
  61          %Authorization{} = auth <-
  62            Repo.get_by(Authorization, token: fixed_token, app_id: app.id),
  63          {:ok, token} <- Token.exchange_token(app, auth) do
  64       response = %{
  65         token_type: "Bearer",
  66         access_token: token.token,
  67         refresh_token: token.refresh_token,
  68         expires_in: 60 * 10,
  69         scope: "read write follow"
  70       }
  71
  72       json(conn, response)
  73     else
  74       _error ->
  75         put_status(conn, 400)
  76         |> json(%{error: "Invalid credentials"})
  77     end
  78   end
  79
  80   # TODO
  81   # - investigate a way to verify the user wants to grant read/write/follow once scope handling is done
  82   def token_exchange(
  83         conn,
  84         %{"grant_type" => "password", "name" => name, "password" => password} = params
  85       ) do
  86     with %App{} = app <- get_app_from_request(conn, params),
  87          %User{} = user <- User.get_cached_by_nickname(name),
  88          true <- Pbkdf2.checkpw(password, user.password_hash),
  89          {:ok, auth} <- Authorization.create_authorization(app, user),
  90          {:ok, token} <- Token.exchange_token(app, auth) do
  91       response = %{
  92         token_type: "Bearer",
  93         access_token: token.token,
  94         refresh_token: token.refresh_token,
  95         expires_in: 60 * 10,
  96         scope: "read write follow"
  97       }
  98
  99       json(conn, response)
 100     else
 101       _error ->
 102         put_status(conn, 400)
 103         |> json(%{error: "Invalid credentials"})
 104     end
 105   end
 106
 107   defp fix_padding(token) do
 108     token
 109     |> Base.url_decode64!(padding: false)
 110     |> Base.url_encode64()
 111   end
 112
 113   defp get_app_from_request(conn, params) do
 114     # Per RFC 6749, HTTP Basic is preferred to body params
 115     {client_id, client_secret} =
 116       with ["Basic " <> encoded] <- get_req_header(conn, "authorization"),
 117            {:ok, decoded} <- Base.decode64(encoded),
 118            [id, secret] <-
 119              String.split(decoded, ":")
 120              |> Enum.map(fn s -> URI.decode_www_form(s) end) do
 121         {id, secret}
 122       else
 123         _ -> {params["client_id"], params["client_secret"]}
 124       end
 125
 126     if client_id && client_secret do
 127       Repo.get_by(
 128         App,
 129         client_id: client_id,
 130         client_secret: client_secret
 131       )
 132     else
 133       nil
 134     end
 135   end
 136 end