;;; url-cid.el --- Content-ID URL loader  -*- lexical-binding: t; -*-

;; Copyright (C) 1998-1999, 2004-2024 Free Software Foundation, Inc.

;; Keywords: comm, data, processes

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;;; Code:

(require 'url-vars)
(require 'url-parse)

(require 'mm-decode)

(defun url-cid-gnus (cid)
  (let ((content-type nil)
 	(encoding nil)
 	(part nil)
 	(data nil))
    (setq part (mm-get-content-id cid))
    (if (not part)
	(message "Unknown CID encountered: %s" cid)
      (setq data (with-current-buffer (mm-handle-buffer part)
		   (buffer-string))
	    content-type (mm-handle-type part)
	    encoding (symbol-name (mm-handle-encoding part)))
      (if (= 0 (length content-type)) (setq content-type "text/plain"))
      (if (= 0 (length encoding)) (setq encoding "8bit"))
      (if (listp content-type)
	  (setq content-type (car content-type)))
      (insert (format "Content-length: %d\r\n"  (length data))
	      "Content-type: " content-type "\r\n"
	      "Content-transfer-encoding: " encoding "\r\n"
	      "\r\n"
	      (or data "")))))

;;;###autoload
(defun url-cid (url)
  (cond
   ((fboundp 'mm-get-content-id)
    ;; Using Pterodactyl Gnus or later
    (with-current-buffer (generate-new-buffer " *url-cid*")
      (url-cid-gnus (url-filename url))))
   (t
    (message "Unable to handle CID URL: %s" url))))

;;; url-cid.el ends here
