commit 15348b09998a4685e24fbe71ede4a182d61d1116
Author: Miguel de la Cruz <miguel@ctrlz.es>
Date:   Sun May 22 13:00:26 2022 +0200

    Initial commit that fills up a buffer with teams and channels

diff --git a/mattermost.el b/mattermost.el
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+;;; mattermost.el --- An Emacs Mattermost Chat Client
+
+;; ToDo: LICENSE HERE
+
+;; Author: Miguel de la Cruz (mgdelacroix@gmail.com)
+;; Version: 0.1
+;; Package-Requires: ((websocket))
+;; Keywords: Mattermost, chat, client, Internet
+
+;;; Code:
+
+(defgroup mattermost nil
+  "Mattermost chat client"
+  :prefix "mattermost-"
+  :group 'applications)
+
+(defcustom mattermost-server-url ""
+  "The URL of the Mattermost server"
+  :group 'mattermost
+  :type 'string)
+
+(setq mattermost-server-url "https://chat.ctrlz.es")
+
+(defun mattermost-parse-json ()
+  "Parses the JSON in the current buffer after a url-request"
+  (let ((json-object-type 'plist)
+        (json-array-type 'list)
+        (json-key-type 'keyword))
+    (goto-char url-http-end-of-headers)
+    (json-read)))
+
+;; ToDo: once mattermost-request parses headers, use it to fetch both
+;; the user (set the id to a local var) and the headers (set the
+;; token)
+(defun mattermost-login (username password)
+  "Log into the Mattermost Server"
+  (let ((url-request-method "POST")
+        (url-request-extra-headers `(("Content-Type" . "application/json")))
+        (url-request-data (json-serialize (list :login_id username :password password))))
+    (with-current-buffer (url-retrieve-synchronously (concat mattermost-server-url "/api/v4/users/login"))
+      (beginning-of-buffer)
+      (search-forward "Token: ")
+      (let ((token (word-at-point))
+            (response (mattermost-parse-json)))
+        ;; ToDo: define these as local vars somehow
+        (setq mattermost-token token)
+        (setq mattermost-user-id (plist-get response :id))
+        token))))
+
+;; ToDo: update to parse headers as well
+(defun mattermost-request (method url &optional body)
+  "Builds a mattemrost request and returns the JSON response"
+  (let ((url-request-method method)
+        (url-request-extra-headers `(("Content-Type" . "application/json")))
+        (url-request-data (if body (json-serialize body))))
+    (if mattermost-token
+        (add-to-list 'url-request-extra-headers (cons "Authorization" (concat "Bearer " mattermost-token))))
+    (with-current-buffer (url-retrieve-synchronously (concat mattermost-server-url "/api/v4" url) t)
+      (mattermost-parse-json))))
+
+(defun mattermost-get-teams ()
+  "Returns the user's team list"
+  (mattermost-request "GET" "/teams"))
+
+(defun mattermost-get-channels (team-id)
+  "Returns the user's channel for a given team"
+  (let ((url (format "/users/%s/teams/%s/channels" mattermost-user-id team-id)))
+    (message "Channels url: %s" url)
+    (mattermost-request "GET" url)))
+
+(with-current-buffer (get-buffer-create "*Mattermost Teams*")
+  (let ((teams (mattermost-get-teams)))
+    (erase-buffer)
+    (dolist (team teams)
+      (let* ((team-id (plist-get team :id))
+             (team-display-name (plist-get team :display_name))
+             (channels (mattermost-get-channels team-id)))
+        (insert (format "%s\n" team-display-name))
+        (dolist (channel channels)
+          (let ((channel-id (plist-get channel :id))
+                (channel-display-name (plist-get channel :display_name))
+                (channel-name (plist-get channel :name)))
+            (insert (format "> %s\n" (if (string= channel-display-name "")
+                                         channel-name
+                                       channel-display-name)))))))))
+
+(provide 'mattermost)
+;;; mattermost.el ends here