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;;; url-expand.el --- expand-file-name for URLs -*- lexical-binding: t -*-
;; Copyright (C) 1999, 2004-2020 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/>.
;;; Code:
(require 'url-methods)
(require 'url-util)
(require 'url-parse)
(defun url-expander-remove-relative-links (name)
(if (equal name "")
;; An empty name is a properly valid relative URL reference/path.
""
;; Strip . and .. from pathnames
(let ((new (if (not (string-match "^/" name))
(concat "/" name)
name)))
;; If it ends with a '/.' or '/..', tack on a trailing '/' sot hat
;; the tests that follow are not too complicated in terms of
;; looking for '..' or '../', etc.
(if (string-match "/\\.+$" new)
(setq new (concat new "/")))
;; Remove '/./' first
(while (string-match "/\\(\\./\\)" new)
(setq new (concat (substring new 0 (match-beginning 1))
(substring new (match-end 1)))))
;; Then remove '/../'
(while (string-match "/\\([^/]*/\\.\\./\\)" new)
(setq new (concat (substring new 0 (match-beginning 1))
(substring new (match-end 1)))))
;; Remove cruft at the beginning of the string, so people that put
;; in extraneous '..' because they are morons won't lose.
(while (string-match "^/\\.\\.\\(/\\)" new)
(setq new (substring new (match-beginning 1) nil)))
new)))
(defun url-expand-file-name (url &optional default)
"Convert URL to a fully specified URL, and canonicalize it.
Second arg DEFAULT is a URL to start with if URL is relative.
If DEFAULT is nil or missing, the current buffer's URL is used.
Path components that are `.' are removed, and
path components followed by `..' are removed, along with the `..' itself."
(if (and url (not (string-match "^#" url)))
;; Need to nuke newlines and spaces in the URL, or we open
;; ourselves up to potential security holes.
(setq url (mapconcat (function (lambda (x)
(if (memq x '(? ?\n ?\r))
""
(char-to-string x))))
url "")))
;; Need to figure out how/where to expand the fragment relative to
(setq default (cond
((url-p default)
;; Default URL has already been parsed
default)
(default
;; They gave us a default URL in non-parsed format
(url-generic-parse-url default))
(url-current-object
;; We are in a URL-based buffer, use the pre-parsed object
url-current-object)
((string-match url-nonrelative-link url)
;; The URL they gave us is absolute, go for it.
nil)
(t
;; Hmmm - this shouldn't ever happen.
(error "url-expand-file-name confused - no default?"))))
(cond
((= (length url) 0) ; nil or empty string
(url-recreate-url default))
((string-match url-nonrelative-link url) ; Fully-qualified URL, return it immediately
url)
(t
(let* ((urlobj (url-generic-parse-url url))
(inhibit-file-name-handlers t)
(expander (url-scheme-get-property (url-type default) 'expand-file-name)))
(if (string-match "^//" url)
(setq urlobj (url-generic-parse-url (concat (url-type default) ":"
url))))
(funcall expander urlobj default)
(url-recreate-url urlobj)))))
(defun url-identity-expander (urlobj defobj)
(setf (url-type urlobj) (or (url-type urlobj) (url-type defobj))))
(defun url-default-expander (urlobj defobj)
;; The default expansion routine - urlobj is modified by side effect!
(if (url-type urlobj)
;; Well, they told us the scheme, let's just go with it.
nil
(setf (url-type urlobj) (or (url-type urlobj) (url-type defobj)))
(setf (url-port urlobj) (or (url-portspec urlobj)
(and (string= (url-type urlobj)
(url-type defobj))
(url-port defobj))))
(if (not (string= "file" (url-type urlobj)))
(setf (url-host urlobj) (or (url-host urlobj) (url-host defobj))))
(if (string= "ftp" (url-type urlobj))
(setf (url-user urlobj) (or (url-user urlobj) (url-user defobj))))
;; If the object we're expanding from is full, then we are now
;; full.
(unless (url-fullness urlobj)
(setf (url-fullness urlobj) (url-fullness defobj)))
(let* ((pathandquery (url-path-and-query urlobj))
(defpathandquery (url-path-and-query defobj))
(file (car pathandquery))
(query (or (cdr pathandquery) (and (equal file "") (cdr defpathandquery)))))
(if (string-match "^/" (url-filename urlobj))
(setq file (url-expander-remove-relative-links file))
;; We use concat rather than expand-file-name to combine
;; directory and file name, since urls do not follow the same
;; rules as local files on all platforms.
(setq file (url-expander-remove-relative-links
(if (equal file "")
(or (car (url-path-and-query defobj)) "")
(concat (url-file-directory (url-filename defobj)) file)))))
(setf (url-filename urlobj) (if query (concat file "?" query) file)))))
(provide 'url-expand)
;;; url-expand.el ends here
|
