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akkoma/lib/pleroma/web/oauth/oauth_controller.ex

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Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.OAuth.OAuthController do
use Pleroma.Web, :controller
alias Pleroma.Registration
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.Auth.Authenticator
alias Pleroma.Web.ControllerHelper
alias Pleroma.Web.OAuth.App
alias Pleroma.Web.OAuth.Authorization
alias Pleroma.Web.OAuth.Token
import Pleroma.Web.ControllerHelper, only: [oauth_scopes: 2]
if Pleroma.Config.get([:auth, :oauth_consumer_enabled]), do: plug(Ueberauth)
plug(:fetch_session)
plug(:fetch_flash)
action_fallback(Pleroma.Web.OAuth.FallbackController)
def authorize(%{assigns: %{token: %Token{} = token}} = conn, params) do
if ControllerHelper.truthy_param?(params["force_login"]) do
do_authorize(conn, params)
else
redirect_uri =
if is_binary(params["redirect_uri"]) do
params["redirect_uri"]
else
app = Repo.preload(token, :app).app
app.redirect_uris
|> String.split()
|> Enum.at(0)
end
redirect(conn, external: redirect_uri(conn, redirect_uri))
end
end
def authorize(conn, params), do: do_authorize(conn, params)
defp do_authorize(conn, params) do
app = Repo.get_by(App, client_id: params["client_id"])
available_scopes = (app && app.scopes) || []
scopes = oauth_scopes(params, nil) || available_scopes
render(conn, Authenticator.auth_template(), %{
response_type: params["response_type"],
client_id: params["client_id"],
available_scopes: available_scopes,
scopes: scopes,
redirect_uri: params["redirect_uri"],
state: params["state"],
params: params
})
end
def create_authorization(
conn,
%{
"authorization" => %{"redirect_uri" => redirect_uri} = auth_params
} = params,
opts \\ []
) do
with {:ok, auth} <-
(opts[:auth] && {:ok, opts[:auth]}) ||
do_create_authorization(conn, params, opts[:user]) do
redirect_uri = redirect_uri(conn, redirect_uri)
cond do
redirect_uri == "urn:ietf:wg:oauth:2.0:oob" ->
render(conn, "results.html", %{
auth: auth
})
true ->
connector = if String.contains?(redirect_uri, "?"), do: "&", else: "?"
url = "#{redirect_uri}#{connector}"
url_params = %{:code => auth.token}
url_params =
if auth_params["state"] do
Map.put(url_params, :state, auth_params["state"])
else
url_params
end
url = "#{url}#{Plug.Conn.Query.encode(url_params)}"
redirect(conn, external: url)
end
else
{scopes_issue, _} when scopes_issue in [:unsupported_scopes, :missing_scopes] ->
# Per https://github.com/tootsuite/mastodon/blob/
# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L39
conn
|> put_flash(:error, "This action is outside the authorized scopes")
|> put_status(:unauthorized)
|> authorize(auth_params)
{:auth_active, false} ->
# Per https://github.com/tootsuite/mastodon/blob/
# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L76
conn
|> put_flash(:error, "Your login is missing a confirmed e-mail address")
|> put_status(:forbidden)
|> authorize(auth_params)
error ->
Authenticator.handle_error(conn, error)
end
end
def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
with %App{} = app <- get_app_from_request(conn, params),
fixed_token = fix_padding(params["code"]),
%Authorization{} = auth <-
Repo.get_by(Authorization, token: fixed_token, app_id: app.id),
%User{} = user <- User.get_by_id(auth.user_id),
{:ok, token} <- Token.exchange_token(app, auth),
{:ok, inserted_at} <- DateTime.from_naive(token.inserted_at, "Etc/UTC") do
response = %{
token_type: "Bearer",
access_token: token.token,
refresh_token: token.refresh_token,
created_at: DateTime.to_unix(inserted_at),
expires_in: 60 * 10,
scope: Enum.join(token.scopes, " "),
me: user.ap_id
}
json(conn, response)
else
_error ->
put_status(conn, 400)
|> json(%{error: "Invalid credentials"})
end
end
def token_exchange(
conn,
%{"grant_type" => "password"} = params
) do
with {_, {:ok, %User{} = user}} <- {:get_user, Authenticator.get_user(conn, params)},
%App{} = app <- get_app_from_request(conn, params),
{:auth_active, true} <- {:auth_active, User.auth_active?(user)},
scopes <- oauth_scopes(params, app.scopes),
[] <- scopes -- app.scopes,
true <- Enum.any?(scopes),
{:ok, auth} <- Authorization.create_authorization(app, user, scopes),
{:ok, token} <- Token.exchange_token(app, auth) do
response = %{
token_type: "Bearer",
access_token: token.token,
refresh_token: token.refresh_token,
expires_in: 60 * 10,
scope: Enum.join(token.scopes, " "),
me: user.ap_id
}
json(conn, response)
else
{:auth_active, false} ->
# Per https://github.com/tootsuite/mastodon/blob/
# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L76
conn
|> put_status(:forbidden)
|> json(%{error: "Your login is missing a confirmed e-mail address"})
_error ->
put_status(conn, 400)
|> json(%{error: "Invalid credentials"})
end
end
def token_exchange(
conn,
%{"grant_type" => "password", "name" => name, "password" => _password} = params
) do
params =
params
|> Map.delete("name")
|> Map.put("username", name)
token_exchange(conn, params)
end
def token_revoke(conn, %{"token" => token} = params) do
with %App{} = app <- get_app_from_request(conn, params),
%Token{} = token <- Repo.get_by(Token, token: token, app_id: app.id),
{:ok, %Token{}} <- Repo.delete(token) do
json(conn, %{})
else
_error ->
# RFC 7009: invalid tokens [in the request] do not cause an error response
json(conn, %{})
end
end
def prepare_request(conn, %{"provider" => provider} = params) do
scope =
oauth_scopes(params, [])
|> Enum.join(" ")
state =
params
|> Map.delete("scopes")
|> Map.put("scope", scope)
|> Poison.encode!()
params =
params
|> Map.drop(~w(scope scopes client_id redirect_uri))
|> Map.put("state", state)
redirect(conn, to: o_auth_path(conn, :request, provider, params))
end
def request(conn, params) do
message =
if params["provider"] do
"Unsupported OAuth provider: #{params["provider"]}."
else
"Bad OAuth request."
end
conn
|> put_flash(:error, message)
|> redirect(to: "/")
end
def callback(%{assigns: %{ueberauth_failure: failure}} = conn, params) do
params = callback_params(params)
messages = for e <- Map.get(failure, :errors, []), do: e.message
message = Enum.join(messages, "; ")
conn
|> put_flash(:error, "Failed to authenticate: #{message}.")
|> redirect(external: redirect_uri(conn, params["redirect_uri"]))
end
def callback(conn, params) do
params = callback_params(params)
with {:ok, registration} <- Authenticator.get_registration(conn, params) do
user = Repo.preload(registration, :user).user
auth_params = Map.take(params, ~w(client_id redirect_uri scope scopes state))
if user do
create_authorization(
conn,
%{"authorization" => auth_params},
user: user
)
else
registration_params =
Map.merge(auth_params, %{
"nickname" => Registration.nickname(registration),
"email" => Registration.email(registration)
})
conn
|> put_session(:registration_id, registration.id)
|> redirect(to: o_auth_path(conn, :registration_details, registration_params))
end
else
_ ->
conn
|> put_flash(:error, "Failed to set up user account.")
|> redirect(external: redirect_uri(conn, params["redirect_uri"]))
end
end
defp callback_params(%{"state" => state} = params) do
Map.merge(params, Poison.decode!(state))
end
def registration_details(conn, params) do
render(conn, "register.html", %{
client_id: params["client_id"],
redirect_uri: params["redirect_uri"],
state: params["state"],
scopes: oauth_scopes(params, []),
nickname: params["nickname"],
email: params["email"]
})
end
def register(conn, %{"op" => "connect"} = params) do
create_authorization_params = %{
"authorization" => Map.merge(params, %{"name" => params["auth_name"]})
}
with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
%Registration{} = registration <- Repo.get(Registration, registration_id),
{:ok, auth} <- do_create_authorization(conn, create_authorization_params),
%User{} = user <- Repo.preload(auth, :user).user,
{:ok, _updated_registration} <- Registration.bind_to_user(registration, user) do
conn
|> put_session_registration_id(nil)
|> create_authorization(
create_authorization_params,
auth: auth
)
else
_ ->
params = Map.delete(params, "password")
conn
|> put_flash(:error, "Unknown error, please try again.")
|> redirect(to: o_auth_path(conn, :registration_details, params))
end
end
def register(conn, params) do
with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
%Registration{} = registration <- Repo.get(Registration, registration_id),
{:ok, user} <- Authenticator.create_from_registration(conn, params, registration) do
conn
|> put_session_registration_id(nil)
|> create_authorization(
%{
"authorization" => %{
"client_id" => params["client_id"],
"redirect_uri" => params["redirect_uri"],
"scopes" => oauth_scopes(params, nil)
}
},
user: user
)
else
{:error, changeset} ->
message =
Enum.map(changeset.errors, fn {field, {error, _}} ->
"#{field} #{error}"
end)
|> Enum.join("; ")
message =
String.replace(
message,
"ap_id has already been taken",
"nickname has already been taken"
)
conn
|> put_flash(:error, "Error: #{message}.")
|> redirect(to: o_auth_path(conn, :registration_details, params))
_ ->
conn
|> put_flash(:error, "Unknown error, please try again.")
|> redirect(to: o_auth_path(conn, :registration_details, params))
end
end
defp do_create_authorization(
conn,
%{
"authorization" =>
%{
"client_id" => client_id,
"redirect_uri" => redirect_uri
} = auth_params
} = params,
user \\ nil
) do
with {_, {:ok, %User{} = user}} <-
{:get_user, (user && {:ok, user}) || Authenticator.get_user(conn, params)},
%App{} = app <- Repo.get_by(App, client_id: client_id),
true <- redirect_uri in String.split(app.redirect_uris),
scopes <- oauth_scopes(auth_params, []),
{:unsupported_scopes, []} <- {:unsupported_scopes, scopes -- app.scopes},
# Note: `scope` param is intentionally not optional in this context
{:missing_scopes, false} <- {:missing_scopes, scopes == []},
{:auth_active, true} <- {:auth_active, User.auth_active?(user)} do
Authorization.create_authorization(app, user, scopes)
end
end
# XXX - for whatever reason our token arrives urlencoded, but Plug.Conn should be
# decoding it. Investigate sometime.
defp fix_padding(token) do
token
|> URI.decode()
|> Base.url_decode64!(padding: false)
|> Base.url_encode64(padding: false)
end
defp get_app_from_request(conn, params) do
# Per RFC 6749, HTTP Basic is preferred to body params
{client_id, client_secret} =
with ["Basic " <> encoded] <- get_req_header(conn, "authorization"),
{:ok, decoded} <- Base.decode64(encoded),
[id, secret] <-
String.split(decoded, ":")
|> Enum.map(fn s -> URI.decode_www_form(s) end) do
{id, secret}
else
_ -> {params["client_id"], params["client_secret"]}
end
if client_id && client_secret do
Repo.get_by(
App,
client_id: client_id,
client_secret: client_secret
)
else
nil
end
end
# Special case: Local MastodonFE
defp redirect_uri(conn, "."), do: mastodon_api_url(conn, :login)
defp redirect_uri(_conn, redirect_uri), do: redirect_uri
defp get_session_registration_id(conn), do: get_session(conn, :registration_id)
defp put_session_registration_id(conn, registration_id),
do: put_session(conn, :registration_id, registration_id)
end