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;;; url-ldap.el --- LDAP Uniform Resource Locator retrieval code -*- lexical-binding: t; -*-
;; Copyright (C) 1998-2025 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 'url-util)
(require 'ldap)
(autoload 'tls-certificate-information "tls")
;; This has been implemented from RFC2255 'The LDAP URL Format' (Dec 1997)
;;
;; basic format is: ldap://host:port/dn?attributes?scope?filter?extensions
;;
;; Test URLs:
;; ldap://ldap.itd.umich.edu/cn%3Dumbflabmanager%2C%20ou%3DUser%20Groups%2C%20ou%3DGroups%2C%20o%3DUniversity%20of%20Michigan%2C%20c%3DUS
;; ldap://ldap.itd.umich.edu/o=University%20of%20Michigan,c=US
;;
;; For simple queries, I have verified compatibility with Netscape
;; Communicator v4.5 under GNU/Linux.
;;
;; For anything _useful_ though, like specifying the attributes,
;; scope, filter, or extensions, netscape claims the URL format is
;; unrecognized. So I don't think it supports anything other than the
;; defaults (scope=base,attributes=*,filter=(objectClass=*)
(defconst url-ldap-default-port 389 "Default LDAP port.")
(defalias 'url-ldap-expand-file-name 'url-default-expander)
(defvar url-ldap-pretty-names
'(("l" . "City")
("objectclass" . "Object Class")
("o" . "Organization")
("ou" . "Organizational Unit")
("cn" . "Name")
("sn" . "Last Name")
("givenname" . "First Name")
("mail" . "Email")
("title" . "Title")
("c" . "Country")
("postalcode" . "ZIP Code")
("telephonenumber" . "Phone Number")
("facsimiletelephonenumber" . "Fax")
("postaladdress" . "Mailing Address")
("description" . "Notes"))
"An assoc list mapping LDAP attribute names to pretty descriptions of them.")
(defvar url-ldap-attribute-formatters
'(("mail" . (lambda (x) (format "<a href='mailto:%s'>%s</a>" x x)))
("owner" . url-ldap-dn-formatter)
("creatorsname" . url-ldap-dn-formatter)
("jpegphoto" . url-ldap-image-formatter)
("usercertificate" . url-ldap-certificate-formatter)
("modifiersname" . url-ldap-dn-formatter)
("namingcontexts" . url-ldap-dn-formatter)
("defaultnamingcontext" . url-ldap-dn-formatter)
("member" . url-ldap-dn-formatter))
"An assoc list mapping LDAP attribute names to pretty formatters for them.")
(defsubst url-ldap-attribute-pretty-name (n)
(or (cdr-safe (assoc (downcase n) url-ldap-pretty-names)) n))
(defsubst url-ldap-attribute-pretty-desc (n v)
(if (string-match "^\\([^;]+\\);" n)
(setq n (match-string 1 n)))
(funcall (or (cdr-safe (assoc (downcase n) url-ldap-attribute-formatters)) 'identity) v))
(defun url-ldap-dn-formatter (dn)
(concat "<a href='/"
(url-hexify-string dn)
"'>" dn "</a>"))
(defun url-ldap-certificate-formatter (data)
;; FIXME: tls.el is obsolete.
(let ((vals (tls-certificate-information data)))
(if (not vals)
"<b>Unable to parse certificate</b>"
(concat "<table border=0>\n"
(mapconcat
(lambda (ava)
(format "<tr><td>%s</td><td>%s</td></tr>\n" (car ava) (cdr ava)))
vals "\n")
"</table>\n"))))
(defun url-ldap-image-formatter (data)
(format "<img alt='JPEG Photo' src='data:image/jpeg;base64,%s'>"
(url-hexify-string (base64-encode-string data))))
;;;###autoload
(defun url-ldap (url)
"Perform an LDAP search specified by URL.
The return value is a buffer displaying the search results in HTML.
URL can be a URL string, or a URL record of the type returned by
`url-generic-parse-url'."
(if (stringp url)
(setq url (url-generic-parse-url (url-unhex-string url)))
(if (not (url-p url))
(error "Argument is not a valid URL")))
(with-current-buffer (generate-new-buffer " *url-ldap*")
(setq url-current-object url)
(insert "Content-type: text/html\r\n\r\n")
(if (not (fboundp 'ldap-search-internal))
(insert "<html>\n"
" <head>\n"
" <title>LDAP Not Supported</title>\n"
" <base href='" (url-recreate-url url) "'>\n"
" </head>\n"
" <body>\n"
" <h1>LDAP Not Supported</h1>\n"
" <p>\n"
" This version of Emacs does not support LDAP.\n"
" </p>\n"
" </body>\n"
"</html>\n")
(let* ((binddn nil)
(data (url-filename url))
(host (url-host url))
(port (url-port url))
(base-object nil)
(attributes nil)
(scope nil)
(filter nil)
(extensions nil)
(results nil))
;; Get rid of leading /
(if (string-match "^/" data)
(setq data (substring data 1)))
(setq data (mapcar (lambda (x) (if (/= (length x) 0) x nil)) (split-string data "\\?"))
base-object (nth 0 data)
attributes (nth 1 data)
scope (nth 2 data)
filter (nth 3 data)
extensions (nth 4 data))
;; fill in the defaults
(setq base-object (url-unhex-string (or base-object ""))
scope (intern (url-unhex-string (or scope "base")))
filter (url-unhex-string (or filter "(objectClass=*)")))
(if (not (memq scope '(base one sub)))
(error "Malformed LDAP URL: Unknown scope: %S" scope))
;; Convert to the internal LDAP support scoping names.
(setq scope (cdr (assq scope '((base . base) (one . onelevel) (sub . subtree)))))
(if attributes
(setq attributes (mapcar 'url-unhex-string (split-string attributes ","))))
;; Parse out the extensions.
(if extensions
(setq extensions (mapcar (lambda (ext)
(if (string-match "\\([^=]*\\)=\\(.*\\)" ext)
(cons (match-string 1 ext) (match-string 2 ext))
(cons ext ext)))
(split-string extensions ","))
extensions (mapcar (lambda (ext)
(cons (url-unhex-string (car ext))
(url-unhex-string (cdr ext))))
extensions)))
(setq binddn (cdr-safe (or (assoc "bindname" extensions)
(assoc "!bindname" extensions))))
;; Now, let's actually do something with it.
(setq results (cdr (ldap-search-internal
(list 'host (concat host ":" (number-to-string port))
'base base-object
'attributes attributes
'scope scope
'filter filter
'binddn binddn))))
(insert "<html>\n"
" <head>\n"
" <title>LDAP Search Results</title>\n"
" <base href='" (url-recreate-url url) "'>\n"
" </head>\n"
" <body>\n"
" <h1>" (int-to-string (length results)) " matches</h1>\n")
(mapc (lambda (obj)
(insert " <hr>\n"
" <table border=1>\n")
(mapc (lambda (attr)
(if (= (length (cdr attr)) 1)
;; single match, easy
(insert " <tr><td>"
(url-ldap-attribute-pretty-name (car attr))
"</td><td>"
(url-ldap-attribute-pretty-desc (car attr) (car (cdr attr)))
"</td></tr>\n")
;; Multiple matches, slightly uglier
(insert " <tr>\n"
" <td valign=top>"
(url-ldap-attribute-pretty-name (car attr)) "</td><td>"
(mapconcat (lambda (x)
(url-ldap-attribute-pretty-desc (car attr) x))
(cdr attr)
"<br>\n")
"</td>"
" </tr>\n")))
obj)
(insert " </table>\n"))
results)
(insert " <hr>\n"
" </body>\n"
"</html>\n")))
(current-buffer)))
(provide 'url-ldap)
;;; url-ldap.el ends here
|
