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+;;; eudcb-ldap.el --- Emacs Unified Directory Client - LDAP Backend
+
+;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+
+;; Author: Oscar Figueiredo <oscar@xemacs.org>
+;; Maintainer: Oscar Figueiredo <oscar@xemacs.org>
+;; Keywords: help
+
+;; 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+;;    This library provides specific LDAP protocol support for the 
+;;    Emacs Unified Directory Client package
+
+;;; Installation:
+;;    Install EUDC first. See EUDC documentation.
+
+;;; Code:
+
+(require 'eudc)
+(require 'ldap)
+
+
+;;{{{      Internal cooking
+
+(eval-and-compile
+  (if (fboundp 'ldap-get-host-parameter)
+      (fset 'eudc-ldap-get-host-parameter 'ldap-get-host-parameter)
+    (defun eudc-ldap-get-host-parameter (host parameter)
+      "Get the value of PARAMETER for HOST in `ldap-host-parameters-alist'."
+      (plist-get (cdr (assoc host ldap-host-parameters-alist))
+		 parameter))))
+
+(defvar eudc-ldap-attributes-translation-alist
+  '((name . sn)
+    (firstname . givenname)
+    (email . mail)
+    (phone . telephonenumber))
+  "Alist mapping EUDC attribute names to LDAP names.")
+
+(eudc-protocol-set 'eudc-query-function 'eudc-ldap-simple-query-internal 
+		   'ldap)
+(eudc-protocol-set 'eudc-list-attributes-function 'eudc-ldap-get-field-list
+		   'ldap)
+(eudc-protocol-set 'eudc-protocol-attributes-translation-alist 
+		   'eudc-ldap-attributes-translation-alist 'ldap)
+(eudc-protocol-set 'eudc-bbdb-conversion-alist 
+		   'eudc-ldap-bbdb-conversion-alist 
+		   'ldap)
+(eudc-protocol-set 'eudc-protocol-has-default-query-attributes nil 'ldap)
+(eudc-protocol-set 'eudc-attribute-display-method-alist 
+		   '(("jpegphoto" . eudc-display-jpeg-inline)
+		     ("labeledurl" . eudc-display-url)
+		     ("audio" . eudc-display-sound)
+		     ("labeledurl" . eudc-display-url)
+		     ("url" . eudc-display-url)) 
+		   'ldap)
+(eudc-protocol-set 'eudc-switch-to-server-hook 
+		   '(eudc-ldap-check-base) 
+		   'ldap)
+
+(defun eudc-ldap-cleanup-record-simple (record)
+  "Do some cleanup in a RECORD to make it suitable for EUDC."
+  (mapcar 
+   (function 
+    (lambda (field)
+      (cons (intern (car field))
+	    (if (cdr (cdr field))
+		(cdr field)
+	      (car (cdr field))))))
+   record))
+
+(defun eudc-filter-$ (string)
+  (mapconcat 'identity (split-string string "\\$") "\n"))
+
+;; Cleanup a LDAP record to make it suitable for EUDC:
+;;   Make the record a cons-cell instead of a list if the it's single-valued
+;;   Filter the $ character in addresses into \n if not done by the LDAP lib
+(defun eudc-ldap-cleanup-record-filtering-addresses (record)
+  (mapcar 
+   (function 
+    (lambda (field)
+      (let ((name (intern (car field)))
+	    (value (cdr field)))
+	(if (memq name '(postaladdress registeredaddress))
+	    (setq value (mapcar 'eudc-filter-$ value)))
+	(cons name
+	      (if (cdr value)
+		  value
+		(car value))))))
+   record))
+
+(defun eudc-ldap-simple-query-internal (query &optional return-attrs)
+  "Query the LDAP server with QUERY.
+QUERY is a list of cons cells (ATTR . VALUE) where ATTRs should be valid 
+LDAP attribute names.  
+RETURN-ATTRS is a list of attributes to return, defaulting to 
+`eudc-default-return-attributes'."
+  (let ((result (ldap-search (eudc-ldap-format-query-as-rfc1558 query)
+			     eudc-server
+			     (if (listp return-attrs)
+				 (mapcar 'symbol-name return-attrs))))
+	final-result)
+    (if (or (not (boundp 'ldap-ignore-attribute-codings))
+	    ldap-ignore-attribute-codings)
+	(setq result 
+	      (mapcar 'eudc-ldap-cleanup-record-filtering-addresses result))
+      (setq result (mapcar 'eudc-ldap-cleanup-record-simple result)))
+
+    (if (and eudc-strict-return-matches
+	     return-attrs
+	     (not (eq 'all return-attrs)))
+	(setq result (eudc-filter-partial-records result return-attrs)))
+    ;; Apply eudc-duplicate-attribute-handling-method
+    (if (not (eq 'list eudc-duplicate-attribute-handling-method))
+	(mapcar 
+	 (function (lambda (record)
+		     (setq final-result 
+			   (append (eudc-filter-duplicate-attributes record)
+				   final-result))))
+	 result))
+    final-result))
+
+(defun eudc-ldap-get-field-list (dummy &optional objectclass)
+  "Return a list of valid attribute names for the current server.
+OBJECTCLASS is the LDAP object class for which the valid
+attribute names are returned. Default to `person'"
+  (interactive)
+  (or eudc-server
+      (call-interactively 'eudc-set-server))
+  (let ((ldap-host-parameters-alist 
+	 (list (cons eudc-server
+		     '(scope subtree sizelimit 1)))))
+    (mapcar 'eudc-ldap-cleanup-record
+	    (ldap-search 
+	     (eudc-ldap-format-query-as-rfc1558 
+	      (list (cons "objectclass"
+			  (or objectclass
+			      "person"))))
+	     eudc-server nil t))))
+
+(defun eudc-ldap-escape-query-special-chars (string)
+  "Value is STRING with characters forbidden in LDAP queries escaped."
+;; Note that * should also be escaped but in most situations I suppose 
+;; the user doesn't want this
+  (eudc-replace-in-string
+   (eudc-replace-in-string
+    (eudc-replace-in-string
+      (eudc-replace-in-string 
+       string 
+       "\\\\" "\\5c")
+      "(" "\\28")
+     ")" "\\29")
+   (char-to-string ?\0) "\\00"))
+
+(defun eudc-ldap-format-query-as-rfc1558 (query)
+  "Format the EUDC QUERY list as a RFC1558 LDAP search filter."
+  (format "(&%s)" 
+	  (apply 'concat 
+		 (mapcar '(lambda (item)
+			    (format "(%s=%s)" 
+				    (car item) 
+				    (eudc-ldap-escape-query-special-chars (cdr item))))
+			 query))))
+
+
+;;}}}        
+
+;;{{{      High-level interfaces (interactive functions)
+
+(defun eudc-ldap-customize ()
+  "Customize the EUDC LDAP support."
+  (interactive)
+  (customize-group 'eudc-ldap))
+
+(defun eudc-ldap-check-base ()
+  "Check if the current LDAP server has a configured search base."
+  (unless (or (eudc-ldap-get-host-parameter eudc-server 'base)
+	      ldap-default-base
+	      (null (y-or-n-p "No search base defined. Configure it now ?")))
+    ;; If the server is not in ldap-host-parameters-alist we add it for the
+    ;; user
+    (if (null (assoc eudc-server ldap-host-parameters-alist))
+	(setq ldap-host-parameters-alist 
+	      (cons (list eudc-server) ldap-host-parameters-alist)))
+    (customize-variable 'ldap-host-parameters-alist)))
+
+;;;}}}
+
+
+(eudc-register-protocol 'ldap)
+
+(provide 'eudcb-ldap)
+
+;;; eudcb-ldap.el ends here