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;;; mastodon-auth.el --- Auth functions for mastodon.el -*- lexical-binding: t -*-
;; Copyright (C) 2017-2019 Johnson Denen
;; Copyright (C) 2021 Abhiseck Paira <abhiseckpaira@disroot.org>
;; Author: Johnson Denen <johnson.denen@gmail.com>
;; Maintainer: Marty Hiatt <martianhiatus@riseup.net>
;; Version: 1.0.0
;; Homepage: https://codeberg.org/martianh/mastodon.el
;; This file is not part of GNU Emacs.
;; This file is part of mastodon.el.
;; mastodon.el is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; mastodon.el is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with mastodon.el. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; mastodon-auth.el supports authorizing and authenticating with Mastodon.
;;; Code:
(require 'plstore)
(require 'auth-source)
(require 'json)
(eval-when-compile (require 'subr-x)) ; for if-let
(autoload 'mastodon-client "mastodon-client")
(autoload 'mastodon-client--active-user "mastodon-client")
(autoload 'mastodon-client--form-user-from-vars "mastodon-client")
(autoload 'mastodon-client--make-user-active "mastodon-client")
(autoload 'mastodon-client--store-access-token "mastodon-client")
(autoload 'mastodon-http--api "mastodon-http")
(autoload 'mastodon-http--append-query-string "mastodon-http")
(autoload 'mastodon-http--get-json "mastodon-http")
(autoload 'mastodon-http--post "mastodon-http")
(defvar mastodon-instance-url)
(defvar mastodon-client-scopes)
(defvar mastodon-client-redirect-uri)
(defvar mastodon-active-user)
(defgroup mastodon-auth nil
"Authenticate with Mastodon."
:prefix "mastodon-auth-"
:group 'mastodon)
(defvar mastodon-auth-source-file nil
"This variable is obsolete.
This variable currently serves no purpose and will be removed in
the future.")
(defvar mastodon-auth--token-alist nil
"Alist of User access tokens keyed by instance url.")
(defvar mastodon-auth--acct-alist nil
"Alist of account accts (name@domain) keyed by instance url.")
(defvar mastodon-auth--user-unaware
" ** MASTODON.EL - NOTICE **
It appears that you are not aware of the recent developments in
mastodon.el. In short we now require that you also set the
variable `mastodon-active-user' in your init file in addition to
`mastodon-instance-url'.
Please see its documentation to understand what value it accepts
by running M-x describe-variable on it or visiting our web page:
https://codeberg.org/martianh/mastodon.el
We apologize for the inconvenience.
")
(defun mastodon-auth--get-browser-login-url ()
"Return properly formed browser login url."
(mastodon-http--append-query-string
(concat mastodon-instance-url "/oauth/authorize/")
`(("response_type" "code")
("redirect_uri" ,mastodon-client-redirect-uri)
("scope" ,mastodon-client-scopes)
("client_id" ,(plist-get (mastodon-client) :client_id)))))
(defvar mastodon-auth--explanation
(format
"
1. A URL has been copied to your clipboard. Open this URL in a
javascript capable browser and your browser will take you to your
Mastodon instance's login page.
2. Login to your account (%s) and authorize \"mastodon.el\".
3. After authorization you will be presented an authorization
code. Copy this code and paste it in the minibuffer prompt."
(mastodon-client--form-user-from-vars)))
(defun mastodon-auth--show-notice (notice buffer-name &optional ask)
"Display NOTICE to user.
NOTICE is displayed in vertical split occupying 50% of total
width. The buffer name of the buffer being displayed in the
window is BUFFER-NAME.
When optional argument ASK is given which should be a string, use
ASK as the minibuffer prompt. Return whatever user types in
response to the prompt.
When ASK is absent return nil."
(let ((buffer (get-buffer-create buffer-name))
(inhibit-read-only t)
ask-value window)
(set-buffer buffer)
(erase-buffer)
(insert notice)
(fill-region (point-min) (point-max))
(read-only-mode)
(setq window (select-window
(split-window (frame-root-window) nil 'left)
t))
(switch-to-buffer buffer t)
(when ask
(setq ask-value (read-string ask))
(kill-buffer buffer)
(delete-window window))
ask-value))
(defun mastodon-auth--request-authorization-code ()
"Ask authorization code and return it."
(let ((url (mastodon-auth--get-browser-login-url))
authorization-code)
(kill-new url)
(message "%s" url)
(setq authorization-code
(mastodon-auth--show-notice mastodon-auth--explanation
"*mastodon-notice*"
"Authorization Code: "))
authorization-code))
(defun mastodon-auth--generate-token ()
"Generate access_token for the user. Return response buffer."
(let ((authorization-code (mastodon-auth--request-authorization-code)))
(mastodon-http--post
(concat mastodon-instance-url "/oauth/token")
`(("grant_type" . "authorization_code")
("client_secret" . ,(plist-get (mastodon-client) :client_secret))
("client_id" . ,(plist-get (mastodon-client) :client_id))
("code" . ,authorization-code)
("redirect_uri" . ,mastodon-client-redirect-uri))
nil
:unauthenticated)))
(defun mastodon-auth--get-token ()
"Make a request to generate an auth token and return JSON response."
(with-current-buffer (mastodon-auth--generate-token)
(goto-char (point-min))
(re-search-forward "^$" nil 'move)
(let ((json-object-type 'plist)
(json-key-type 'keyword)
(json-array-type 'vector)
(json-string (buffer-substring-no-properties (point) (point-max))))
(json-read-from-string json-string))))
(defun mastodon-auth--access-token ()
"Return the access token to use with `mastodon-instance-url'.
Generate/save token if none known yet."
(cond (mastodon-auth--token-alist
;; user variables are known and
;; initialised already.
(alist-get mastodon-instance-url mastodon-auth--token-alist
nil nil 'equal))
((plist-get (mastodon-client--active-user) :access_token)
;; user variables needs to initialised by reading from
;; plstore.
(push (cons mastodon-instance-url
(plist-get (mastodon-client--active-user) :access_token))
mastodon-auth--token-alist)
(alist-get mastodon-instance-url mastodon-auth--token-alist
nil nil 'equal))
((null mastodon-active-user)
;; user not aware of 2FA related changes and has not set the
;; `mastodon-active-user' properly. Make user aware and error
;; out.
(mastodon-auth--show-notice mastodon-auth--user-unaware
"*mastodon-notice*")
(error "Variables not set properly"))
(t
;; user access-token needs to fetched from the server and
;; stored and variables initialised.
(mastodon-auth--handle-token-response (mastodon-auth--get-token)))))
(defun mastodon-auth--handle-token-response (response)
"Add token RESPONSE to `mastodon-auth--token-alist'.
The token is returned by `mastodon-auth--get-token'.
Handle any errors from the server."
(pcase response
((and (let token (plist-get response :access_token))
(guard token))
(mastodon-client--make-user-active
(mastodon-client--store-access-token token))
(cdar (push (cons mastodon-instance-url token)
mastodon-auth--token-alist)))
(`(:error ,class :error_description ,error)
(error "Mastodon-auth--access-token: %s: %s" class error))
(_ (error "Unknown response from mastodon-auth--get-token!"))))
(defun mastodon-auth--get-account-name ()
"Request user credentials and return an account name."
(alist-get
'acct
(mastodon-http--get-json
(mastodon-http--api
"accounts/verify_credentials")
nil
:silent)))
(defun mastodon-auth--get-account-id ()
"Request user credentials and return an account name."
(alist-get
'id
(mastodon-http--get-json
(mastodon-http--api
"accounts/verify_credentials"))))
(defun mastodon-auth--user-acct ()
"Return a mastodon user acct name."
(or (cdr (assoc mastodon-instance-url mastodon-auth--acct-alist))
(let ((acct (mastodon-auth--get-account-name)))
(push (cons mastodon-instance-url acct) mastodon-auth--acct-alist)
acct)))
(provide 'mastodon-auth)
;;; mastodon-auth.el ends here
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