gistfile1.txt

<?php

function apci_groups_user_is_groupmate($op, $user = NULL) {
  switch ($op) {
    case 'cache' :
      // insert code here to return the cache_id name
      if (arg(0) == 'user' && is_numeric(arg(1))) {
        $uid = arg(1);
      }
      elseif (arg(0) == 'node' && is_numeric(arg(1))) {
        $uid = _vr_get_author(arg(1));
      }
      if (!isset($uid)) {
        return NULL;
      }
      if ($uid == $user->uid) {
        return FALSE;
      }
      return "apci_groups_user_is_groupmate:$user->uid:$uid";
      break;
    case 'process' :
      // insert code here to evaluate the context
      if (arg(0) == 'user' && is_numeric(arg(1))) {
        $uid = arg(1);
      }
      elseif (arg(0) == 'node' && is_numeric(arg(1))) {
        $uid = _vr_get_author(arg(1));
      }
      if (!isset($uid)) {
        return FALSE;
      }
      if ($uid == $user->uid) {
        return FALSE;
      }
      return _apci_groups_users_in_same_group($user->uid, $uid);
      break;
  }
}

/**
 * Helper function for determining whether or not users are in the same group
 */
function _apci_groups_users_in_same_group($uid1, $uid2) {
  static $friends = array();
  if (isset($frields[$uid1][$uid2])) {
    return $friends[$uid1][$uid2];
  }
  $sql = 'SELECT n.nid, oru.uid AS uid1, oru2.uid AS uid2 FROM node n LEFT JOIN og_rap_uid oru ON n.nid = oru.nid LEFT JOIN og_rap orap ON oru.rid = orap.rid LEFT JOIN og_rap_uid oru2 ON n.nid = oru2.nid LEFT JOIN og_rap orap2 ON oru2.rid = orap2.rid WHERE orap.type = "participant" AND orap2.type = "participant" AND oru.uid = %d AND oru2.uid = %d';
  $resource = db_query($query, $uid1, $uid2);
  if (!empty(db_fetch_array($resource))) {
    $friends[$uid1][$uid2] = TRUE;
  }
  else {
    $friends[$uid1][$uid2] = FALSE;
  }
  return $friends[$uid1][$uid2];
}

/**
 * Helper function for determining the author of a node.
 */
function _apci_groups_get_author($nid) {
  static $node = array();
  if (isset($node[$nid])) {
    return $node[$nid];
  }
  $sql = "SELECT n.uid FROM {node} n WHERE n.nid = %d LIMIT 1";
  $resource = db_query($sql, $nid);
  if ($result = db_result($resource)) {
    $node[$nid] = $result;
    return $result;
  }
  $node[$nid] = FALSE;
  return $node[$nid];
}

/**
 * Wrapper if() statement to protect against duplicate function names.
 */
if (!function_exists('_vr_get_author')) {
  function _vr_get_author($nid) {
    return _apci_groups_get_author($nid);
  }
}