<?php

/**
 * @file
 * The masquerade module, which allows admin users to impersonate other users.
 */




/**
 * Implementation of hook_menu
 *
 */
function masquerade_menu() {
  
  $items = array();
  
  $items["admin-tools/masquerade"] = array(
    "title" => "Masquerade as another user",
    "page_callback" => "fp_render_form",
    "page_arguments" => array("masquerade_form"),
    "access_arguments" => array("access_masquerade"),
    "page_settings" => array(      
      "menu_links" => array(          
        0 => array(
          "text" => t("Admin Tools"),
          "path" => "admin-tools",
          "query" => "de_catalog_year=%DE_CATALOG_YEAR%",
        ),
      ),    
      "menu_icon" => fp_get_module_path('masquerade') . "/icons/mask.png",
    ),        
    "type" => MENU_TYPE_NORMAL_ITEM,
    'weight' => 40,
  );
   
  
  $items["masquerade"] = array(
    "page_callback" => "masquerade_perform_masquerade",
    "access_arguments" => array("access_masquerade"),
    "type" => MENU_TYPE_CALLBACK,  
  ); 
  
  
  return $items;
}



/**
 * Actually perform the switching of users to the selected user.
 *
 */
function masquerade_perform_masquerade() {
  global $user;
  
  $user_id = intval($_REQUEST["user_id"]);
  
  // Do not allow user_id 1
  if ($user_id === 1) {
    fp_add_message(t("Admin user is not allowed to be selected for masquerade."), "error");
    fp_goto("<front>");
    return;
  }
  
  
  // Set up a new $account object.
  $account = new stdClass();
  
  $account = fp_load_user($user_id);
  // Okay, let's look for all the modules who have implimented hook_user_login
  $modules = modules_implement_hook("user_login");
  foreach ($modules as $module) {
    call_user_func_array($module . '_user_login', array(&$account));
  }
  
  // Set the $account to the SESSION.
  $_SESSION["fp_user_object"] = $account;
  
  watchdog("masquerade", "@user is now masquerading as @newuser. New CWID: @cwid", array("@user" => "$user->name ($user->id)", "@newuser" => "$account->name ($account->id)", "@cwid" => $account->cwid));
  
  $_SESSION["masquerade_active"] = TRUE;
  $_SESSION["masquerade_original_user"] = $user;
  fp_goto("<front>");
}


function masquerade_init() {
  global $user;
  
  if (isset($_SESSION["masquerade_active"]) && $_SESSION["masquerade_active"]) {
    fp_add_message(t("You are currently masquerading as %user (originally %ou).  To return to your previous
                      account, log out, then log in normally.", 
                      array("%user" => $user->name, "%ou"=>$_SESSION["masquerade_original_user"]->name)), 
                   "status", TRUE);

  }
}




/**
 * This form will let the user specify which user they wish to impersonate.
 */
function masquerade_form() {
  $form = array();
  
  $form["mark" . $m++] = array(
    "value" => "<p>" . t("Use this form to decide which user you wish to impersonate.  Once selected,
                  you will experience FlightPath as that user would until you log out.") . "</p>",
  );
   
  $form["username_or_cwid"] = array(
    "label" => t("Last name, Email, Username, or CWID:"),
    "type" => "textfield",
    "value" => $_REQUEST["username_or_cwid"],
    "description" => t("Enter the last name, email, username, or CWID of the person you wish to impersonate.  Will display the first 20 results only.
                      <br>Ex:  peacocrj7  or  10022312."),
  );
  
  $form["submit"] = array(
    "type" => "submit", 
    "spinner" => TRUE,
    "value" => t("Look up"),
  );
  
  $users = $_SESSION["masquerade_lookup_users"];
  if (is_array($users) && count($users) > 0) {
    $form["mark" . $m++] = array(
      "value" => "<hr><p>" . t("Please click on the user you wish to impersonate:") . "</p>
        <ul>",
    );
    
    $c = 0;
    foreach($users as $uid) {
      $account = fp_load_user($uid);
             
      $type = "";
      if ($account->is_student) $type .= t("student");
      if ($account->is_faculty) $type .= t("faculty");
      
      $form["mark" . $m++] = array(        
        "value" => "<li>" . l("$account->name - $account->f_name $account->l_name ($account->cwid) - $type", "masquerade", "user_id=$account->id") . "</li>",        
      );
      
      $c++;
      if ($c >= 20) break;
      
    }
    
    $form["mark" . $m++] = array(
      "value" => "</ul>",
    );
    
    unset($_SESSION["masquerade_lookup_users"]);
    
  }
  else if (is_array($users)) {
    $form["mark" . $m++] = array(
      "value" => "<hr><p>" . t("Sorry, no results.") . "</p>
        <ul>",
    );
    unset($_SESSION["masquerade_lookup_users"]);    
  }
  
  
  return $form;
}



/**
 * The submit handler for masquerade_form.
 * 
 * We want to look up the user(s) for the username or CWID entered, placing that
 * information in the SESSION.  When we return to the form, it will display these
 * results for the user to select.
 *
 * @param unknown_type $form
 * @param unknown_type $form_state
 */
function masquerade_form_submit($form, &$form_state) {
  
  $username_or_cwid = trim($form_state["values"]["username_or_cwid"]);

  
  if ($username_or_cwid == "") return;
  
  $users = array();
  
  $res = db_query("SELECT user_id FROM users WHERE cwid LIKE ?
                    LIMIT 20", array("%$username_or_cwid%"));
  while ($cur = db_fetch_array($res)) {
    $users[intval($cur['user_id'])] = $cur['user_id'];
  }
  
  $res = db_query("SELECT user_id FROM users WHERE user_name LIKE ?
                    LIMIT 20", array("%$username_or_cwid%"));
  while ($cur = db_fetch_array($res)) {
    $users[intval($cur['user_id'])] = $cur['user_id'];
  }

  
  $res = db_query("SELECT user_id FROM users WHERE email LIKE ?
                    LIMIT 20", array("%$username_or_cwid%"));
  while ($cur = db_fetch_array($res)) {
    $users[intval($cur['user_id'])] = $cur['user_id'];
  }
  
  $res = db_query("SELECT user_id FROM users WHERE l_name LIKE ?
                    LIMIT 20", array("%$username_or_cwid%"));
  while ($cur = db_fetch_array($res)) {
    $users[intval($cur['user_id'])] = $cur['user_id'];
  }
    
  if (isset($users[1])) {
    unset($users[1]); // do not allow admin user to be selected.
  }
  
  
  // Okay, let's add the users we found to the SESSION.
  $_SESSION["masquerade_lookup_users"] = $users;
   
  
}





/**
 * Implementation of hook_perm
 */
function masquerade_perm() {
  return array(
    "access_masquerade" => array(
      "title" => t("Access masquerade"),
      "description" => t("This is a VERY powerful permission!  It will allow 
                           a user to become any other user (except admin), without
                           knowing their password.  Only give it to very trusted users."),
      "admin_restricted" => TRUE, // means only appears for admin (user_id == 1)
    ),
  );
}