user.module 79.6 KB
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<?php
// $Id$

session_set_save_handler("sess_open", "sess_close", "sess_read", "sess_write", "sess_destroy", "sess_gc");
session_start();

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function user_system($field){
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  $system["description"] = t("Enables the user registration and login system.");
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  return $system[$field];
}

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/*** Session functions *****************************************************/

function sess_open($save_path, $session_name) {
  return 1;
}

function sess_close() {
  return 1;
}

function sess_read($key) {
  global $user;
  $user = user_load(array("sid" => $key, "status" => 1));

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  return !empty($user->session) ? $user->session : '';
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}

function sess_write($key, $value) {

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  db_query("UPDATE users SET hostname = '%s', session = '%s', timestamp = %d WHERE sid = '$key'", $_SERVER["REMOTE_ADDR"], $value, time());
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  return '';
}

function sess_destroy($key) {

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  db_query("UPDATE users SET hostname = '%s', timestamp = %d, sid = '' WHERE sid = '$key'", $_SERVER["REMOTE_ADDR"], time());
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}

function sess_gc($lifetime) {
  return 1;
}

/*** Common functions ******************************************************/

function user_external_load($authname) {
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  $arr_uid = db_query("SELECT uid FROM authmap WHERE authname = '%s'", $authname);
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  if (db_fetch_object($arr_uid)) {
    $uid = db_result($arr_uid);
    return user_load(array("uid" => $uid));
  }
  else {
    return 0;
  }
}

function user_load($array = array()) {

  /*
  ** Dynamically compose a SQL query:
  */

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  $query = "";

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  foreach ($array as $key => $value) {
    if ($key == "pass") {
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      $query .= "u.$key = '". md5($value) ."' AND ";
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     }
    else {
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      $query .= "u.$key = '". check_query($value) ."' AND ";
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    }
  }
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  $result = db_query_range("SELECT u.*, r.name AS role FROM users u LEFT JOIN role r ON u.rid = r.rid WHERE $query u.status < 3", 0, 1);
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  $user = db_fetch_object($result);
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  if ($user->data && $data = unserialize($user->data)) {
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    foreach ($data as $key => $value) {
      if (!isset($user->$key)) {
        $user->$key = $value;
      }
    }
  }
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  return $user;
}

function user_save($account, $array = array()) {
  /*
  ** Dynamically compose a SQL query:
  */

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  $user_fields = user_fields();
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  if ($account->uid) {
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    $data = unserialize(db_result(db_query("SELECT data FROM users WHERE uid = %d", $account->uid)));
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    foreach ($array as $key => $value) {
      if ($key == "pass") {
        $query .= "$key = '". md5($value) ."', ";
      }
      else if (substr($key, 0, 4) !== "auth") {
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        if (in_array($key, $user_fields)) {
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          $query .= "$key = '". check_query($value) ."', ";
        }
        else {
          $data[$key] = $value;
        }
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      }
    }
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    $query .= "data = '". check_query(serialize($data)) ."', ";
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    db_query("UPDATE users SET $query timestamp = %d WHERE uid = %d", time(), $account->uid);
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    $user = user_load(array("uid" => $account->uid));
  }
  else {
    $array["timestamp"] = time();

    foreach ($array as $key => $value) {
      if ($key == "pass") {
        $fields[] = check_query($key);
        $values[] = "'". md5($value) ."'";
      }
      else if (substr($key, 0, 4) !== "auth") {
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        if (in_array($key, $user_fields)) {
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          $fields[] = check_query($key);
          $values[] = "'". check_query($value) ."'";
        }
        else {
          $data[$key] = $value;
        }
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      }
    }

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    $fields[] = "data";
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    $values[] = "'". check_query(serialize($data)) ."'";
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    db_query("INSERT INTO users (". implode(", ", $fields) .") VALUES (". implode(", ", $values) .")");

    $user = user_load(array("name" => $array["name"]));
  }

  foreach ($array as $key => $value) {
    if (substr($key, 0, 4) == "auth") {
      $authmaps[$key] = $value;
    }
  }

  if ($authmaps) {
    $result = user_set_authmaps($user, $authmaps);
  }

  return $user;
}

function user_set($account, $key, $value) {
  $account->data[$key] = $value;
  return $account;
}

function user_get($account, $key) {
  return $account->data[$key];
}

function user_validate_name($name) {

  /*
  ** Verify the syntax of the given name:
  */

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  if (!$name) return t("You must enter a username.");
  if (ereg("^ ", $name)) return t("The username cannot begin with a space.");
  if (ereg(" \$", $name)) return t("The username cannot end with a space.");
  if (ereg("  ", $name)) return t("The username cannot contain multiple spaces in a row.");
  // if (ereg("[^a-zA-Z0-9@-@]", $name)) return t("The username contains an illegal character.");
  if (ereg('@', $name) && !eregi('@([0-9a-z](-?[0-9a-z])*\.)+[a-z]{2}([zmuvtg]|fo|me)?$', $name)) return t("The username is not a valid authentication ID.");
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  if (!eregi('^[[:print:]]+', $name)) return t("The name contains an illegal character.");
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  if (strlen($name) > 56) return t("The username '%name' is too long: it must be less than 56 characters.", array("%name" => $name));
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}

function user_validate_mail($mail) {

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  if ($mail && !valid_email_address($mail)) {
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    return t("The e-mail address '%mail' is not valid.", array("%mail" => $mail));
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  }
}

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function user_validate_authmap($account, $authname, $module) {
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  $result = db_query("SELECT COUNT(*) from authmap WHERE uid != %d AND authname = '%s'", $account->uid, $authname);
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  if (db_result($result) > 0) {
    $name = module_invoke($module, "info", "name");
    return t("The %u ID %s is already taken.", array("%u" => ucfirst($name), "%s" => "<i>$authname</i>"));
  }
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}

function user_password($min_length = 6) {

  /*
  ** Generate a human-readable password:
  */

  mt_srand((double)microtime() * 1000000);
  $words = explode(",", variable_get("user_password", "foo,bar,guy,neo,tux,moo,sun,asm,dot,god,axe,geek,nerd,fish,hack,star,mice,warp,moon,hero,cola,girl,fish,java,perl,boss,dark,sith,jedi,drop,mojo"));
  while (strlen($password) < $min_length) $password .= trim($words[mt_rand(0, count($words))]);
  return $password;
}

function user_access($string) {

  global $user;
  static $perm;

  /*
  ** To reduce the number of SQL queries, we cache the user's permissions
  ** in a static variable.
  */
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  if (isset($perm)) {
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    if ($user->uid) {
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      $perm = db_result(db_query("SELECT p.perm FROM role r, permission p WHERE r.rid = p.rid AND name = '%s'", $user->role), 0);
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    }
    else {
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      $perm = db_result(db_query("SELECT p.perm FROM role r, permission p WHERE r.rid = p.rid AND name = 'anonymous user'"), 0);
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    }
  }

  if ($user->uid == 1) {
    return 1;
  }
  else {
    return strstr($perm, $string);
  }

}

function user_mail($mail, $subject, $message, $header) {
  if (variable_get("smtp_library", "") && file_exists(variable_get("smtp_library", ""))) {
    include_once variable_get("smtp_library", "");
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    return user_mail_wrapper($mail, $subject, $message, $header);
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  }
  else {
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    /*
    ** Note: if you are having problems with sending mail, or mails look wrong
    ** when they are recieved you may have to modify the str_replace to suit
    ** your systems.
    **  - \r\n will work under dos and windows.
    **  - \n will work for linux, unix and BSDs.
    **  - \r will work for macs.
    */
    return mail($mail, $subject, str_replace("\r", "", $message), $header);
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  }
}

function user_deny($type, $mask) {

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  $allow = db_fetch_object(db_query("SELECT * FROM access WHERE status = '1' AND type = '%s' AND LOWER('%s') LIKE LOWER(mask)", $type, $mask));
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  $deny = db_fetch_object(db_query("SELECT * FROM access WHERE status = '0' AND type = '%s' AND LOWER('%s') LIKE LOWER(mask)", $type, $mask));
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  if ($deny && !$allow) {
    return 1;
  }
  else {
    return 0;
  }
}

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function user_fields() {
  static $fields;
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  if (!$fields) {
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    $result = db_query("SELECT * FROM users WHERE uid = 1");
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    if (db_num_rows($result)) {
      $fields = array_keys(db_fetch_array($result));
    }
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  }
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  // Make sure we return the default fields at least
  return is_array($fields) ? $fields: array("uid", "name", "pass", "mail", "homepage", "mode", "sort", "threshold", "theme", "signature", "timestamp", "hostname", "status", "timezone", "rating", "language", "sid", "init", "session", "data", "rid");
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}

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/*** Module hooks **********************************************************/

function user_perm() {
  return array("administer users");
}

function user_search($keys) {
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  $result = db_query_range("SELECT * FROM users WHERE name LIKE '%$keys%'", 0, 20);
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  while ($account = db_fetch_object($result)) {
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    $find[$i++] = array("title" => $account->name, "link" => (strstr($_SERVER["PHP_SELF"], "admin") ? url("admin/user/edit/$account->uid") : url("user/view/$account->uid")), "user" => $account->name);
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  }
  return $find;
}

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function user_block($op = "list", $delta = 0) {
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  global $user;

  $edit = $_POST["edit"];
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  if ($op == "list") {
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     $blocks[0]["info"] = t("Log in");
     $blocks[1]["info"] = t("User information");
     $blocks[2]["info"] = t("Who's new");
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     return $blocks;
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  }
  else {
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    switch ($delta) {
      case 0:
        if (!$user->uid) {
          $output = "<div align=\"center\">\n";
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          $output .= "<form action=\"". url("user/login") ."\" method=\"post\">\n";
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          /*
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          ** Save the referer.  We record where the user came from such
          ** that we/ can redirect him after having completed the login
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          ** form.
          */
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          if (empty($edit)) {
            $edit["destination"] = request_uri();
          }
          // NOTE: special care needs to be taken because on pages with forms, such as node and comment submission pages, the $edit variable might already be set.
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          $output .= "<input name=\"edit[destination]\" type=\"hidden\" value=\"" . $edit["destination"] . "\" />";
          $output .= "<b>". t("Username") .":</b><br /><input name=\"edit[name]\" size=\"15\" /><br />\n";
          $output .= "<b>". t("Password") .":</b><br /><input name=\"edit[pass]\" size=\"15\" type=\"password\" /><br />\n";

          if (variable_get("user_remember", 0) == 0) {
            $output .= "<input name=\"edit[remember_me]\" type=\"checkbox\" />". t("Remember me");
          }
          elseif (variable_get("user_remember", 1) == 1) {
            $output .= form_hidden("remember_me", 1);
          }
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          $output .= "<br />\n<input name=\"edit[op]\" type=\"submit\" value=\"". t("Log in") ."\" /><br />\n";
          $output .= "</form></div>\n";
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          if (variable_get("user_register", 1)) {
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            $items[] = l(t("Create new account"), "user/register", array("title" => t("Create a new user account.")));
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          }
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          $items[] = l(t("Request new password"), "user/password", array("title" => t("Request new password via e-mail.")));
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          $output .= theme("theme_item_list", $items);
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          $block["subject"] = t("Log in");
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          $block["content"] = "<div style=\"white-space: nowrap;\">$output</div>";
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          return $block;
        }
        break;
      case 1:
        if ($user->uid) {
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          $content[] = theme("theme_menu_list", module_invoke_all("link", "menu.create"));
          $content[] = theme("theme_menu_list", module_invoke_all("link", "menu.view"));
          $content[] = theme("theme_menu_list", module_invoke_all("link", "menu.settings"));
          $content[] = theme("theme_menu_list", module_invoke_all("link", "menu.misc"));
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          $output = implode($content, "<br />");
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          $block["subject"] = $user->name;
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          $block["content"] = "<div style=\"{ white-space: nowrap; }\">$output</div>";
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          return $block;
        }
        break;
      case 2:
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        $result = db_query_range("SELECT uid, name FROM users WHERE status != '0' ORDER BY uid DESC", 0, 5);
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        while ($account = db_fetch_object($result)) {
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          $items[] = l((strlen($account->name) > 15 ? substr($account->name, 0, 15) . '...' : $account->name), "user/view/$account->uid");
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        }

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        $output = theme("theme_user_list", $items);
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        $block["subject"] = t("Who's new");
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        $block["content"] = $output;
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        return $block;
    }
  }
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}

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function theme_user_list($items, $title = NULL) {
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  return theme("theme_item_list",$items, $title);
}

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function theme_menu_list($items, $title = NULL) {
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  return theme("theme_item_list",$items, $title);
}

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function user_link($type) {
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  $links = array();

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  if ($type == "page") {
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    $links[] = l(t("user account"), "user", array("title" => t("Create a user account, request a new password or edit your account settings.")));
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  }

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  if ($type == "menu.settings") {
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    $links[] = l(t("edit account"), "user/edit", array("title" => t("View and edit your account information.")));
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  }

  if ($type == "menu.misc") {
    if (user_access("access administration pages")) {
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      $links[] = l(t("administer %a", array("%a" => variable_get("site_name", "drupal"))), "admin", array("title" => t("Access administration pages.")));
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    }

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    $links[] = l(t("logout"), "user/logout", array("title" => t("Logout.")));
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  }

  if ($type == "admin" && user_access("administer users")) {
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    $help["user"] = "Drupal allows users to register, login, logout, maintain user profiles, etc.  No participant can use his own name to post content until he signs up for a user account.  There are several configuration pages that help administrators manage user accounts.";
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    $help["create"] = "If your site is completely private, and doesn't allow public registration, then you can add new users manually.  This web page allows administrator to register a new users.";
    $help["view"] = "This page allows you to review and edit any user's profile.";
    $help["access"] = "Access rules enable administrators to filter out usernames and e-mail addresses which are not allowed in Drupal.  An administrator creates a 'mask' against which each new registration is checked. Disallowed names and e-mail addresses are denied access to the site.";
    $help["permission"] = "Each user role has certain things that its users are allowed to do, and some that are disallowed. For example, authenticated users may usually post a story but anonymous users may not.  Each permission describes a fine-grained logical operation such as access administration pages or add and modify user accounts. You could say a permission represents access granted to a user to perform a set of operations.";
    $help["role"] = "Roles allow you to fine tune the security and administration of drupal.  A role defines a group of users which have certain privileges.  Examples of roles include: anonymous user, authenticated user, moderator, administrator and so on.  By default, Drupal comes with two user roles: <ul><li>Anonymous user: this role is used for users that don't have a user account or that are not authenticated.</li><li>Registered user: this role is assigned automatically to authenticated users.  Most registered users will belong to this user role unless specified otherwise.</li></ul>";
    $help["search"] = "On this page you can query any username.  For example, one may search for 'br' and Drupal might return 'brian', 'brad', and 'brenda'.";
    $help["setting"] = "Administrators may choose to restrict registration to their site.  That restriction may be accomplished on this page.  Also, the list of words which may be included in a system generated password is also listed on this page.  Drupal generates passwords by joining small words from the password list until the new password is greater than 6 characters.";

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    menu("admin/user", "user management", "user_admin", $help["user"], 2);
    menu("admin/user/create", "create new account", "user_admin", $help["create"], 1);
    menu("admin/user/account", "view user accounts", "user_admin", $help["view"], 2);
    menu("admin/user/access", "access rules", NULL, $help["access"], 3);
    menu("admin/user/access/mail", "e-mail rules", "user_admin", $help["access"]);
    menu("admin/user/access/user", "username rules", "user_admin", $help["access"]);
    menu("admin/user/role", "user roles", "user_admin", $help["role"], 4);
    menu("admin/user/permission", "user permissions", "user_admin", $help["permission"], 5);
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    menu("admin/user/search", "search accounts", "user_admin", $help["search"], 8);
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    menu("admin/user/help", "help", "user_help", NULL, 9);
    menu("admin/user/edit", "edit user account", "user_admin", NULL, 0, 1); // hidden menu
    menu("admin/user/account/0", "active users", "user_admin", $help["view"], 1);
    menu("admin/user/account/1", "new users", "user_admin", $help["view"], 2);
    menu("admin/user/account/2", "blocked users", "user_admin", $help["view"], 3);

    $i = 3;
    foreach (user_roles(1) as $key => $value) {
      menu("admin/user/account/". $i++, "users with role '$value'", "user_admin", $help["view"], 4);
    }
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  }

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  return $links;
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}

/*** Authentication methods ************************************************/

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function user_get_authname($account, $module) {
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  /*
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  **  Called by authentication modules in order to edit/view their authmap information.
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  */

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  $result = db_query("SELECT authname FROM authmap WHERE uid = %d AND module = '%s'", $account->uid, $module);
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  return db_result($result);
}

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function user_get_authmaps($authname = NULL) {

  /*
  ** Accepts an user object, $account, or an DA name and returns an
  ** associtive array of modules and DA names. Called at external login.
  */

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  $result = db_query("SELECT authname, module FROM authmap WHERE authname = '%s'", $authname);
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  if (db_num_rows($result) > 0) {
    while ($authmap = db_fetch_object($result)) {
      $authmaps[$authmap->module] = $authmap->authname;
    }
    return $authmaps;
  }
  else {
    return 0;
  }
}

function user_set_authmaps($account, $authmaps) {
  foreach ($authmaps as $key => $value) {
    $module = explode("_", $key, 2);
    if ($value) {
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      $result = db_query("SELECT COUNT(*) from authmap WHERE uid = %d AND module = '%s'", $account->uid, $module["1"]);
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      if (db_result($result) == 0) {
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        $result = db_query("INSERT INTO authmap (authname, uid, module) VALUES ('%s', %d, '%s')", $value, $account->uid, $module[1]);
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      }
      else {
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        $result = db_query("UPDATE authmap SET authname = '%s' WHERE uid = %d AND module = '%s'", $value, $account->uid, $module["1"]);
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      }
    }
    else {
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      $result = db_query("DELETE FROM authmap WHERE uid = %d AND module = '%s'", $account->uid, $module["1"]);
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    }
  }
  return $result;
}

function user_auth_help_links() {
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  $links = array();
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  foreach (module_list() as $module) {
    if (module_hook($module, "auth_help")) {
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      $links[] = l(module_invoke($module, "info", "name"), "user/help#$module");
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    }
  }
  return $links;
}

/*** User features *********************************************************/

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function user_login($edit = array(), $msg = "") {
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  global $user;
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  /*
  ** If we are already logged on, go to the user page instead.
  */

  if ($user->uid) {
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    drupal_goto(url("user"));
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  }

  if (user_deny("user", $edit["name"])) {
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    $error = t("The name '%s' has been denied access.", array("%s" => $edit["name"]));
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  }
  else if ($edit["name"] && $edit["pass"]) {

    /*
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    ** Try to log in the user locally:
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    */

    if (!$user) {
      $name = check_input($edit["name"]);
      $pass = check_input($edit["pass"]);
      $user = user_load(array("name" => $name, "pass" => $pass, "status" => 1));
    }

    /*
    ** Strip name and server from ID:
    */

    if ($server = strrchr($edit["name"], "@")) {
      $name = check_input(substr($edit["name"], 0, strlen($edit["name"]) - strlen($server)));
      $server = check_input(substr($server, 1));
      $pass = check_input($edit["pass"]);
    }

    /*
    ** When possible, determine corrosponding external auth source. Invoke source, and login user if successful:
    */

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    if (!$user && $server && $result = user_get_authmaps("$name@$server")) {
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      if (module_invoke(key($result), "auth", $name, $pass, $server)) {
        $user = user_external_load("$name@$server");
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        watchdog("user", "external load: $name@$server, module: ". key($result));
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      }
      else {
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        $error = t("Invalid password for %s.", array("%s" => "<i>$name@$server</i>"));
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      }
    }

     /*
    ** Try each external authentication source in series. Register user if successful.
    */

    else if (!$user && $server) {
      foreach (module_list() as $module) {
        if (module_hook($module, "auth")) {
          if (module_invoke($module, "auth", $name, $pass, $server)) {
            if (variable_get("user_register", 1) == 1 && !user_load(array("name" => "$name@$server"))) { //register this new user
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              $user = user_save("", array("name" => "$name@$server", "pass" => user_password(), "init" => "$name@$server", "status" => 1, "authname_$module" => "$name@$server", "rid" => _user_authenticated_id()));
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              watchdog("user", "new user: $name@$server ($module ID)", l("edit user", "admin/user/edit/$user->uid"));
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              break;
            }
          }
        }
      }
    }

    if ($user->uid) {
      watchdog("user", "session opened for '$user->name'");

      /*
      ** Write session ID to database:
      */

      user_save($user, array("sid" => session_id()));

      /*
      ** If the user wants to be remembered, set the proper cookie such
      ** that the session won't expire.
      */

      if ($edit["remember_me"]) {
        setcookie(session_name(), session_id(), time() + 3600 * 24 * 365);
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      }
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      else {
        setcookie(session_name(), session_id());
      }

      /*
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      ** Redirect the user to the page he logged on from.
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      */

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      drupal_goto($edit["destination"]);
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    }
    else {
      if (!$error) {
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        $error = t("Sorry.  Unrecognized username or password.") ." ". l(t("Have you forgotten your password?"), "user/password");
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      }
      if ($server) {
        watchdog("user", "failed login for '$name@$server': $error");
      }
      else {
        watchdog("user", "failed login for '$name': $error");
      }
    }
  }

  /*
  ** Display error message (if any):
  */

  if ($error) {
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    $output .= theme("theme_error", $error);
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  }

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  /*
  ** Save the referer.  We record where the user came from such that we
  ** can redirect him after having completed the login form.
  */

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  if (empty($edit)) {
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    $edit["destination"] = request_uri();
  }
  $output .= form_hidden("destination", $edit["destination"]);

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  /*
  ** Display login form:
  */

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  if ($msg) {
    $output .= "<p>$msg</p>";
  }
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  if (count(user_auth_help_links()) > 0) {
    $output .= form_textfield(t("Username"), "name", $edit["name"], 20, 64, t("Enter your %s username, or an ID from one of our affiliates: %a.", array("%s" => variable_get("site_name", "local"), "%a" => implode(", ", user_auth_help_links()))));
  }
  else {
    $output .= form_textfield(t("Username"), "name", $edit["name"], 20, 64, t("Enter your %s username.", array("%s" => variable_get("site_name", "local"))));
  }
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  $output .= form_password(t("Password"), "pass", $pass, 20, 64, t("Enter the password that accompanies your username."));
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  $output .= form_checkbox(t("Remember me"), "remember_me", 1, 0, 0);
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  $output .= form_submit(t("Log in"));
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  $output .= "<p>&raquo; ". l(t("Request new password"), "user/password"). "<br />";
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  if (variable_get("user_register", 1)) {
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    $output .= "&raquo; ". l(t("Create new account"), "user/register");
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  }
  $output .= "</p>";
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  return form($output, "post", url("user"));
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}

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function _user_authenticated_id() {
  return db_result(db_query("SELECT rid FROM role WHERE name = 'authenticated user'"));
}

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function user_logout() {
  global $user;

  if ($user->uid) {
    watchdog("user", "session closed for user '$user->name'");

    /*
    ** Destroy the current session:
    */

    session_destroy();
    unset($user);
  }

  /*
  ** Redirect the user to his personal information page:
  */

  drupal_goto("index.php");

}

function user_pass($edit = array()) {

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  global $base_url;

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  if ($edit["name"]) {
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    $account = db_fetch_object(db_query("SELECT uid, name, mail FROM users WHERE name = '%s'", $edit["name"]));
    if (!$account) $error = t("Sorry. The username <i>%s</i> is not recognized.", array("%s" => $edit["name"]));
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  }
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  else if ($edit["mail"]) {
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    $account = db_fetch_object(db_query("SELECT uid, name, mail FROM users WHERE mail = '%s'", $edit["mail"]));
    if (!$account) $error = t("Sorry. The e-mail address <i>%s</i> is not recognized.", array("%s" => $edit["mail"]));
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  }
  if ($account) {
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      $from = variable_get("site_mail", ini_get("sendmail_from"));
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      $pass = user_password();

      /*
      ** Save new password:
      */

      user_save($account, array("pass" => $pass));

      /*
      ** Mail new password:
      */

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      $variables = array("%username" => $account->name, "%site" => variable_get("site_name", "drupal"), "%password" => $pass, "%uri" => $base_url, "%uri_brief" => substr($base_url, strlen("http://")), "%mailto" => $account->mail, "%date" => format_date(time()));
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      $subject = strtr(variable_get("user_mail_pass_subject", t("Replacement login information for %username at %site")), $variables);
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      $body = strtr(variable_get("user_mail_pass_body", t("%username,\n\nHere is your new password for %site.  You may now login to ". url("user/login") ." using the following username and password:\n\nusername: %username\npassword: %password\n\nAfter logging in, you may wish to change your password at ". url("user/edit") .".\n\nYour new %site membership also enables you to login to other Drupal powered websites (e.g. http://www.drop.org/) without registering.  Just use the following Drupal ID and password:\n\nDrupal ID: %username@%uri_brief\npassword: %password\n\n\n-- %site team")), $variables);
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      $headers = "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from";
      user_mail($account->mail, $subject, $body, $headers);
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      watchdog("user", "mail password: '". $account->name ."' &lt;". $account->mail ."&gt;");
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      return t("Your password and further instructions have been sent to your e-mail address.");
    }
    else {
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    // Display error message if necessary.
    if ($error) {
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      $output .= theme("theme_error", $error);
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    }

    /*
    ** Display form:
    */

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    $output .= "<p>". sprintf(t("Enter your username %sor%s your e-mail address."), "<b><i>", "</i></b>") ."</p>";
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    $output .= form_textfield(t("Username"), "name", $edit["name"], 30, 64);
    $output .= form_textfield(t("E-mail address"), "mail", $edit["mail"], 30, 64);
    $output .= form_submit(t("E-mail new password"));
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    $output .= "<p>&raquo; ". l(t("Log in"), "user/login") ."<br />";
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    if (variable_get("user_register", 1)) {
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      $output .= "&raquo; ". l(t("Create new account"), "user/register");
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    }
    $output .= "</p>";
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    return form($output, "post", url("user"));
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  }
}

function user_register($edit = array()) {
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  global $user, $base_url;
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  $edit = $_POST["edit"];
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  /*
  ** If we are already logged on, go to the user page instead.
  */

  if ($user->uid) {
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    drupal_goto(url("user/edit"));
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  }
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  if ($edit["name"] && $edit["mail"]) {
    if ($error = user_validate_name($edit["name"])) {
      // do nothing
    }
    else if ($error = user_validate_mail($edit["mail"])) {
      // do nothing
    }
    else if (user_deny("user", $edit["name"])) {
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      $error = t("The name '%s' has been denied access.", array("%s" => $edit["name"]));
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    }
    else if (user_deny("mail", $edit["mail"])) {
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      $error = t("The e-mail address '%s' has been denied access.", array("%s" => $edit["mail"]));
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    }
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    else if (db_num_rows(db_query("SELECT name FROM users WHERE LOWER(name) = LOWER('%s')", $edit["name"])) > 0) {
      $error = t("The name '%s' is already taken.", array("%s" => $edit["name"]));
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    }
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    else if (db_num_rows(db_query("SELECT mail FROM users WHERE LOWER(mail) = LOWER('%s')", $edit["mail"])) > 0) {
      $error = t("The e-mail address '%s' is already taken.", array("%s" => $edit["mail"]));
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    }
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    else if (variable_get("user_register", 1) == 0) {
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      $error = t("Public registrations have been disabled by the site administrator.");
    }
    else {
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      foreach (module_list() as $module) {
        if (module_hook($module, "user")) {
          $result = module_invoke($module, "user", "register_validate", $edit, $user);
          if (is_array($result)) {
            $data = array_merge($data, $result);
          }
          elseif (is_string($result)) {
            $error = $result;
            break;
          }
        }
      }
      if (!$error) {
        $success = 1;
      }
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    }
  }

  if ($success) {

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    $from = variable_get("site_mail", ini_get("sendmail_from"));
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    $pass = user_password();

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    // create new user account, noting whether administrator approval is required
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    user_role_init();
    // TODO: is this necessary? Won't session_write replicate this?
    unset($edit["session"]);
    $account = user_save("", array_merge(array("name" => $edit["name"], "pass" => $pass, "init" => $edit["mail"], "mail" => $edit["mail"], "rid" => _user_authenticated_id(), "rating" => 0, "status" => (variable_get("user_register", 1) == 1 ? 1 : 0)), $data));
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    watchdog("user", "new user: '". $edit["name"] ."' &lt;". $edit["mail"] ."&gt;", l("edit user", "admin/user/edit/$account->uid"));
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    $variables = array("%username" => $edit["name"], "%site" => variable_get("site_name", "drupal"), "%password" => $pass, "%uri" => $base_url, "%uri_brief" => substr($base_url, strlen("http://")), "%mailto" => $edit["mail"], "%date" => format_date(time()));
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    //the first user may login immediately, and receives a customized welcome e-mail.
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    if ($account->uid == 1) {
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      user_mail($edit["mail"], t("drupal user account details for %s", array("%s" => $edit["name"])), strtr(t("%username,\n\nYou may now login to %uri using the following username and password:\n\n  username: %username\n  password: %password\n\n". url("user/edit") ."\n\n--drupal"), $variables), "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from");
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      // This should not be t()'ed. No point as its only shown once in the sites lifetime, and it would be bad to store the password
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      $output .= "<p>Welcome to Drupal. You are user #1, which gives you full and immediate access.  All future registrants will receive their passwords via e-mail, so please configure your e-mail settings using the Administration pages.</p><p> Your password is <b>$pass</b>. You may change your password on the next page.</p><p>Please login below.</p>";
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      $output .= form_hidden("name", $account->name);
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      $output .= form_hidden("pass", $pass);
      $output .= form_submit(t("Log in"));
      return form($output);
    }
    else {
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      if ($account->status) {
        /*
        ** Create new user account, no administrator approval required:
        */

        $subject = strtr(variable_get("user_mail_welcome_subject", t("User account details for %username at %site")), $variables);
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        $body = strtr(variable_get("user_mail_welcome_body", t("%username,\n\nThank you for registering at %site. You may now login to ". url("user/login") ." using the following username and password:\n\nusername: %username\npassword: %password\n\nAfter logging in, you may wish to change your password at ". url("user/edit") .".\n\nYour new %site membership also enables to you to login to other Drupal powered websites (e.g. http://www.drop.org/) without registering. Just use the following Drupal ID and password:\n\nDrupal ID: %username@%uri_brief\npassword: %password\n\n\n--  %site team")), $variables);
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        user_mail($edit["mail"], $subject, $body, "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from");
        return t("Your password and further instructions have been sent to your e-mail address.");
      }
      else {
        /*
        ** Create new user account, administrator approval required:
        */
        $subject = strtr(variable_get("user_mail_welcome_subject", t("User account details for %username at %site")), $variables);
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        $body = strtr(variable_get("user_mail_welcome_body", t("%username,\n\nThank you for registering at %site. Your account will have to be approved by the site administrator. You may now login to ". url("user/login") ." using the following username and password:\n\nusername: %username\npassword: %password\n\nAfter logging in, you may wish to change your password at ". url("user/edit") .".\n\nYour new %site membership also enables to you to login to other Drupal powered websites (e.g. http://www.drop.org/) without registering. Just use the following Drupal ID and password:\n\nDrupal ID: %username@%uri_brief\npassword: %password\n\n\n--  %site team")), $variables);
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        user_mail($edit["mail"], $subject, $body, "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from");
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        user_mail(variable_get("site_mail", ini_get("sendmail_from")), $subject, t("%u has applied for an account.\n\n%uri", array("%u" => $account->name, "%uri" => url("admin/user/edit/$account->uid"))), "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from");
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        return t("Your password and further instructions have been sent to your e-mail address.");
      }
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    }
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  }
  else {
    if ($error) {
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      $output .= theme("theme_error", $error);
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    }
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  }
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  // display the registration form
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  $output .= variable_get("user_registration_help", "");
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  $affiliates = user_auth_help_links();
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  if (count($affiliates) > 0) {
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    $affiliates = implode(", ", $affiliates);
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    $output .= "<p>" . t("Note: If you have an account with one of our affiliates (%s), you may ". l("login now", "user/login") ." instead of registering.", array("%s" => $affiliates)) ."</p>";
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  }
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  $output .= form_textfield(t("Username"), "name", $edit["name"], 30, 64, t("Your full name or your preferred username: only letters, numbers and spaces are allowed."));
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  $output .= form_textfield(t("E-mail address"), "mail", $edit["mail"], 30, 64, t("A password and instructions will be sent to this e-mail address, so make sure it is accurate."));
  foreach (module_list() as $module) {
    if (module_hook($module, "user")) {
      $output .= module_invoke($module, "user", "register_form", $edit, $user);
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    }
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  }
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  $output .= form_submit(t("Create new account"));
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  $output .= "<p>&raquo; ". l(t("E-mail new password"), "user/password"). "<br />";
  $output .= "&raquo; ". l(t("Log in"), "user/login") ."</p>";
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  return form($output);
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}

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function user_delete() {
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  global $user;

  $edit = $_SERVER["edit"];
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  if ($edit["confirm"]) {
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    watchdog("user","$user->name deactivated her own account.");
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    db_query("UPDATE users SET mail = 'deleted', status = '0' WHERE uid = %d", $user->uid);
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    $output .= t("Your account has been deactivated.");
  }
  else {
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    $output .= form_item(t("Confirm Deletion"), t("You are about to deactivate your own user account. In addition, your e-mail address will be removed from the database."));
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    $output .= form_hidden("confirm", 1);
    $output .= form_submit(t("Delete account"));
    $output = form($output);
  }
  return $output;
}

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function user_edit($edit = array()) {
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  global $user, $languages;
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  if ($user->uid) {
    if ($edit["name"]) {
      if ($error = user_validate_name($edit["name"])) {
        // do nothing
      }
      else if ($error = user_validate_mail($edit["mail"])) {
        // do nothing
      }
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      else if (db_num_rows(db_query("SELECT uid FROM users WHERE uid != '$user->uid' AND LOWER(name) = LOWER('%s')", $edit["name"])) > 0) {
        $error = t("The name '%s' is already taken.", array("%s" => $edit["name"]));
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      }
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      else if ($edit["mail"] && db_num_rows(db_query("SELECT uid FROM users WHERE uid != '$user->uid' AND LOWER(mail) = LOWER('%s')", $edit["mail"])) > 0) {
        $error = t("The e-mail address '%s' is already taken.", array("%s" => $edit["mail"]));
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      }
      else if ($user->uid) {
        /*
        ** If required, check that proposed passwords match.  If so,
        ** add new password to $edit.
        */

        if ($edit["pass1"]) {
          if ($edit["pass1"] == $edit["pass2"]) {
            $edit["pass"] = $edit["pass1"];
          }
          else {
            $error = t("The specified passwords do not match.");
          }
        }
        unset($edit["pass1"], $edit["pass2"]);

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        /*
        ** Validate input fields to make sure users don't submit
        ** invalid form data.
        */

        if (!user_access("administer users")) {
           if (array_intersect(array_keys($edit), array("rid", "init", "rating", "session"))) {
             watchdog("warning", "detected malicious attempt to alter a protected database field");
           }

           $edit["rid"] = $user->rid;
           $edit["init"] = $user->init;
           $edit["rating"] = $user->rating;
           $edit["session"] = $user->session;
        }
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        /*
        ** Have the modules that extend the user information validate
        ** their data.
        */

        foreach (module_list() as $module) {
          if (module_hook($module, "user")) {
            $result = module_invoke($module, "user", "edit_validate", $edit, $user);
          }
          if (is_array($result)) {
            $data = array_merge($data, $result);
          }
          elseif (is_string($result)) {
            $error = $result;
            break;
          }
        }

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        if (!$error) {
          /*
          ** Save user information:
          */
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          $user = user_save($user, array_merge($edit, $data));
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          $output .= t("Your user information changes have been saved.");
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        }
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      }
    }

    if ($error) {
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      $output .= theme("theme_error", $error);
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    }

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    if (!$edit) {
      $edit = object2array($user);
    }

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    $output .= form_textfield(t("Username"), "name", $edit["name"], 30, 55, t("Your full name or your preferred username: only letters, numbers and spaces are allowed."));
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    $output .= form_textfield(t("E-mail address"), "mail", $edit["mail"], 30, 55, t("Insert a valid e-mail address.  All e-mails from the system will be sent to this address. The e-mail address is not made public and will only be used if you wish to receive a new password or wish to receive certain news or notifications by e-mail."));
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    foreach (module_list() as $module) {
      if (module_hook($module, "user")) {
        $output .= module_invoke($module, "user", "edit_form", $edit, $user);
      }
    }

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    $options = "<option value=\"\"". (("" == $key) ? " selected=\"selected\"" : "") .">". t("Default theme") ."</option>\n";
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    foreach (theme_list() as $key => $value) {
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      $options .= "<option value=\"$key\"". (($edit["theme"] == $key) ? " selected=\"selected\"" : "") .">$key - $value->description</option>\n";
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    }
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    $output .= form_item(t("Theme"), "<select name=\"edit[theme]\">$options</select>", t("Selecting a different theme will change the look and feel of the site."));
    for ($zone = -43200; $zone <= 46800; $zone += 3600) $zones[$zone] = date("l, F dS, Y - h:i A", time() - date("Z") + $zone) ." (GMT ". $zone / 3600 .")";
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    $output .= form_select(t("Time zone"), "timezone", $edit["timezone"], $zones, t("Select what time you currently have and your time zone settings will be set appropriate."));
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    $output .= form_select(t("Language"), "language", $edit["language"], $languages, t("Selecting a different language will change the language of the site."));
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    $output .= form_item(t("Password"), "<input type=\"password\" name=\"edit[pass1]\" size=\"12\" maxlength=\"24\" /> <input type=\"password\" name=\"edit[pass2]\" size=\"12\" maxlength=\"24\" />", t("Enter your new password twice if you want to change your current password or leave it blank if you are happy with your current password."));
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    $output .= form_submit(t("Save user information"));
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