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+;;; stack-auth.el --- user authentication for stack-mode  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2014  Sean Allred
+
+;; Author: Sean Allred <code@seanallred.com>
+;; Keywords: help, hypermedia, mail, news, tools
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; 
+
+;;; Code:
+
+(require 'stack-core)
+
+(defconst stack-auth-root
+  "https://stackexchange.com/oauth/dialog")
+(defconst stack-auth--redirect-uri
+  "http://vermiculus.github.io/stack-mode/auth/auth.htm")
+(defconst stack-auth--client-id
+  "3291")
+(defvar stack-auth-access-token
+  nil
+  "Your access token.
+
+This is needed to use your account to write questions, make
+comments, and read your inbox.  Do not alter this unless you know
+what you are doing!")
+
+(defun stack-authenticate ()
+  "Authenticate this application.
+
+Authentication is required to read your personal data (such as
+notifications) and to write with the API (asking and answering
+questions)."
+  (interactive)
+  (setq
+   stack-auth-access-token
+   (when (browse-url
+          (let ((stack-core-api-root stack-auth-root)
+                (stack-core-api-batch-request-separator ","))
+            (stack-core-build-request
+             nil
+             `((client_id . ,stack-auth--client-id)
+               (scope . (read_inbox
+                         no_expiry
+                         write_access))
+               (redirect_uri . ,(url-hexify-string
+                                 stack-auth--redirect-uri))))))
+     (read-string "Enter the access token displayed on the webpage: ")))
+  (if (string-equal "" stack-auth-access-token)
+      (progn (setq stack-auth-access-token nil)
+             (error "You must enter this code to use this client fully"))
+    (stack-cache-set "auth.el" `((access-token . ,stack-auth-access-token)))))
+
+(provide 'stack-auth)
+;;; stack-auth.el ends here