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;;; mastodon-auth.el --- Auth functions for mastodon.el
;; Copyright (C) 2017 Johnson Denen
;; Author: Johnson Denen <johnson.denen@gmail.com>
;; Homepage: https://github.com/jdenen/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 'mastodon)
(require 'mastodon-http)
(defgroup mastodon-auth nil
"Authenticate with Mastodon."
:prefix "mastodon-auth-"
:group 'mastodon)
(defvar mastodon--client-app-plist nil)
(defvar mastodon--api-token-string nil)
(defun mastodon-auth--token-file ()
"Returns `mastodon-token-file' string."
mastodon-token-file)
(defun mastodon-auth--registration-success ()
(let ((client-data (mastodon--json-hash-table)))
(setq mastodon--client-app-plist
`(:client_id
,(gethash "client_id" client-data)
:client_secret
,(gethash "client_secret" client-data)))))
(defun mastodon--register-client-app-triage (status)
"Callback function to triage `mastodon--register-client-app' response.
STATUS is passed by `url-retrieve'."
(mastodon--http-response-triage status
'mastodon-auth--registration-success))
(defun mastodon--register-client-app ()
"Add `:client_id' and `client_secret' to `mastodon--client-plist'."
(mastodon--http-post (mastodon--api-for "apps")
'mastodon--register-client-app-triage
'(("client_name" . "mastodon.el")
("redirect_uris" . "urn:ietf:wg:oauth:2.0:oob")
("scopes" . "read write follow")
("website" . "https://github.com/jdenen/mastodon.el"))))
(defun mastodon-auth--client-app-secret-p ()
"Return t if `mastodon--client-app-plist' has a :client_secret value."
(when (plist-get mastodon--client-app-plist :client_secret) t))
(defun mastodon--register-and-return-client-app ()
"Register `mastodon' with an instance. Return `mastodon--client-app-plist'."
(if (mastodon-auth--client-app-secret-p)
mastodon--client-app-plist
(progn
(mastodon--register-client-app)
(sleep-for 2)
(mastodon--register-and-return-client-app))))
(defun mastodon--store-client-id-and-secret ()
"Store `:client_id' and `:client_secret' in a plstore."
(let ((client-plist (mastodon--register-and-return-client-app))
(plstore (plstore-open (mastodon-auth--token-file))))
(plstore-put plstore "mastodon" `(:client_id
,(plist-get client-plist :client_id)
:client_secret
,(plist-get client-plist :client_secret))
nil)
(plstore-save plstore)
client-plist))
(defun mastodon--client-app ()
"Return `mastodon--client-app-plist'.
If not set, retrieves client data from `mastodon-token-file'.
If no data can be found in the token file, registers the app and stores its data via `mastodon--store-client-id-and-secret'."
(if (plist-get mastodon--client-app-plist :client_secret)
mastodon--client-app-plist
(let* ((plstore (plstore-open (mastodon-auth--token-file)))
(mastodon (plstore-get plstore "mastodon")))
(if mastodon
(progn
(setq mastodon--client-app-plist (delete "mastodon" mastodon))
mastodon--client-app-plist)
(progn
(setq mastodon--client-app-plist (mastodon--store-client-id-and-secret))
mastodon--client-app-plist)))))
(defun mastodon-auth--get-token-success ()
(let ((token-data (mastodon--json-hash-table)))
(progn
(setq mastodon--api-token-string (gethash "access_token" token-data))
mastodon--api-token-string)))
(defun mastodon--get-access-token-triage (status)
"Callback function to triage `mastodon--get-access-token' response.
STATUS is passed by `url-retrieve'."
(mastodon--http-response-triage status
'mastodon-auth--get-token-success))
(defun mastodon-auth--user-and-passwd ()
"Prompt for user email and password."
(let ((email (read-string "Email: "))
(passwd (read-passwd "Password: ")))
(cons email passwd)))
(defun mastodon--get-access-token ()
"Retrieve access token from instance.
Authenticates with email address and password. Neither are not stored."
(let* ((creds (mastodon-auth--user-and-passwd))
(email (car creds))
(passwd (cdr creds)))
(mastodon--http-post (concat mastodon-instance-url "/oauth/token")
'mastodon--get-access-token-triage
`(("client_id" . ,(plist-get (mastodon--client-app) :client_id))
("client_secret" . ,(plist-get (mastodon--client-app) :client_secret))
("grant_type" . "password")
("username" . ,email)
("password" . ,passwd)
("scope" . "read write follow")))))
(defun mastodon-auth--token ()
"Return `mastodon--api-token-string'."
mastodon--api-token-string)
(defun mastodon--access-token ()
"Return `mastodon--api-token-string'.
If not set, retrieves token with `mastodon--get-access-token'."
(or (mastodon-auth--token)
(progn
(mastodon--get-access-token)
(or (mastodon-auth--token)
(progn
(sleep-for 2)
(mastodon--access-token))))))
(provide 'mastodon-auth)
;;; mastodon-auth.el ends here
|
