LDAP修改用户信息，防止重复

下面是用户修改自己密码的代码。这个表单工作得很完美。现在的问题是，我希望用户能够更改他们的电子邮件，电话，甚至他们的名字。我使用管理员帐户，因此它具有搜索LDAP中的每个人并检索每个人的所有信息的权限。现在的问题是我不希望用户插入重复，所以如果一个人的电子邮件bobizumi@stackoverflow.com已经存在于LDAP中，那么用户不应该被允许进入这个电子邮件。名字和电子邮件也是如此。我不确定如何做这个搜索重复，我假设它使用ldap_search和ldap_get_entries，但我是新的与LDAP编程，所以我需要一些编程协助如何去做这个。如果我能看到一个例子，或者有人可以向我展示一个例子，也许可以防止名称重复和ldap搜索与管理权限，然后我可以从那里继续做剩下的我自己，但我只是真的坚持代码部分，而不是逻辑。我在文档中找不到太多ldap的例子以及它与PHP的集成和功能或任何代码片段，所以我只能从PHP手册中尝试。

PHP:

function changePassword($server,$dn,$user,$oldPassword,$newPassword,$newPasswordCnf){
  global $message;
  error_reporting(0);
  $con=ldap_connect($server);
  ldap_set_option($con, LDAP_OPT_PROTOCOL_VERSION, 3);
  $findWhat = array ("cn","mail","*");
  $findWhere = $dn;
  $findFilter = "(uid=$user)";
  #bind anon and find user by uid
  $sr = ldap_search($con,$dn,$findFilter,$findWhat);
  $records = ldap_get_entries($con, $sr);
  // echo "<pre>";print_r($records);
  /* error if found more than one user */
  if ($records["count"] != "1") {
    $message[] = "Error E100 - Wrong user.";
    return false; 
  }else {
    $message[] = "Found user <b>".$records[0]["cn"][0]."</b>";
  }
  /* try to bind as that user */
  if (ldap_bind($con, $records[0]["dn"], $oldPassword) === false) {
    $message[] = "Error E104 - Current password is wrong.";
    return false;
  }
  else {    echo"TEST";
  $sr = ldap_search($con,$dn,$findFilter,$findWhat);
  $records = ldap_get_entries($con, $sr);
   echo "<pre>";print_r($records);
   }
  if ($newPassword != $newPasswordCnf ) {
    $message[] = "Error E101 - New passwords do not match! ";
    return false;
  }
  if (strlen($newPassword) < 8 ) {
    $message[] = "Error E102 - Your new password is too short! ";
    return false;
  }
  if (!preg_match("/[0-9]/",$newPassword)) {
    $message[] = "Error E103 - Your password must contain at least one digit. ";
    return false;
  }
  if (!preg_match("/[a-zA-Z]/",$newPassword)) {
    $message[] = "Error E103 - Your password must contain at least one letter. ";
    return false;
  }



  $entry = array();
  $entry["userPassword"] = "{SHA}" . base64_encode( pack( "H*", sha1( $newPassword ) ) );
  if (ldap_modify($con,$records[0]["dn"],$entry) === false){
    $message[] = "E200 - Your password cannot be change, please contact the administrator.";
  }
  else { 
    $message[] = " Your password has been changed. "; 
    //mail($records[0]["mail"][0],"Password change notice : ".$user,"Your password has just been changed."); 
    } 
}  
?>

HTML:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
 <title>Change your password</title>
 <style type="text/css">
 body { font-family: Verdana,Arial,Courier New; font-size: 0.7em;  }
 input:focus { background-color: #eee; border-color: red; }
 th { text-align: right; padding: 0.8em; }
 #container { text-align: center; width: 500px; margin: 5% auto; } 
 ul { text-align: left; list-style-type: square; } 
 .msg { margin: 0 auto; text-align: center; color: navy;  border-top: 1px solid red;  border-bottom: 1px solid red;  } 
 </style>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</head>
<body>
<div id="container">
<h2> Change your LDAP password </h2>
<ul>
  <li> Your new password must be 8 characters long and contain at least one letter and one digit. </li>
</ul>
<form method="post">
  <table style="width: 400px; margin: 0 auto;">
    <tr><th>Username:</th><td><input name="username" type="text" size="20" autocomplete="off" /></td></tr>
    <tr><th>Old password:</th><td><input name="oldPassword" type="password" /></td></tr>
    <tr><th>New password:</th><td><input name="newPassword1" type="password" /></td></tr>
    <tr><th>New password (confirm):</th><td><input name="newPassword2" type="password" /></td></tr>
    <tr><td colspan="2" style="text-align: center;" ><input name="submitted" type="submit" value="Login"/></td></tr>
  </table>
</form>
<div class="msg">
<?php 
if (isset($_POST["submitted"])) {
  $rdn = sprintf($dn,$_POST["username"]); 
  changePassword($server,$dn,$_POST["username"],$_POST["oldPassword"],$_POST["newPassword1"],$_POST["newPassword2"]);
  foreach ( $message as $one ) { echo "<p>$one</p>"; }
} 
?>
</div>
</div>
</body></html>

OpenLDAP有一个'唯一性'覆盖正是为此而设计的。您可以通过slapd.conf加载它，并配置您需要的唯一属性。

Ldap不支持对字段的唯一约束，除了专有名称。您可以在这些字段上进行搜索，并在一个查询中使用或条件进行搜索，但您不会得到100%的保护。两个人可以在同一时间提交相同的值，并且可能出现重复的时机正好。下面是一个搜索姓名或电子邮件的过滤器示例。

(|(&(givenname=joe)(sn=smith))(mail=joe.smith@example.com))

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