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<?php
/**
* This file is used to create and process our anti-abuse section.
*
* @author Douglas Muth <http://www.dmuth.org/>
*/


/**
* Our settings form.
*
* @return array An array of form data
*/
function ddt_abuse_form($form_state) {

$retval = array();

$ddt_abuse_users = variable_get("ddt_abuse_users", "");
$ddt_abuse_ips = variable_get("ddt_abuse_ips", "");
$ddt_abuse_chat = variable_get("ddt_abuse_chat", "");

$retval["abuse"] = array(
"#type" => "fieldset",
"#title" => t("Anti-Abuse"),
);

$retval["abuse"]["users"] = array(
"#type" => "textfield",
"#title" => t("View User IPs"),
"#description" => t("Enter 1 or more comma-delimited usernames or UIDs. (UIDs take precedence)"),
"#default_value" => $ddt_abuse_users,
);

//
// If this is set do a search.
//
if ($_SESSION["ddt"]["abuse"]["search"]) {

if ($ddt_abuse_users) {
$retval["abuse"]["user_ips"] = array(
"#type" => "item",
"#title" => "User IP Results",
"#value" => ddt_abuse_get_user_ips($ddt_abuse_users),
);
}

}

$retval["abuse"]["ips"] = array(
"#type" => "textfield",
"#title" => t("View Users of IPs"),
"#description" => t("Enter 1 or more comma-delimited IP addresses "
. "to see what users came from them. "
. "Using % wildcards is acceptable."
. "This is an intensive query and WILL hammer the server. I warned ya!"
),
"#default_value" => $ddt_abuse_ips,
);

//
// If this is set do a search.
//
if ($_SESSION["ddt"]["abuse"]["search"]) {

if ($ddt_abuse_ips) {
$retval["abuse"]["ip_users"] = array(
"#type" => "item",
"#title" => "IP User Results",
"#value" => ddt_abuse_get_ip_users($ddt_abuse_ips),
);
}

}

if (module_exists("chatroom")) {
$oldest_message = ddt_abuse_get_chat_oldest_message();
$retval["abuse"]["chat"] = array(
"#type" => "textfield",
"#title" => t("Search chat logs"),
"#description" => t("Search messages in chatlogs for a string. "
. "Useful for investigating reports of harassment, abuse, or spam. "
. "This is also a very intensive query.<br/> "
. "Oldest message is from: <b>$oldest_message</b>.</br> "
. "Please note that if you use this on chatrooms NOT "
. "available to all users, you may be <b>violating your users' "
. "privacy</b>. I warned ya! "
),
"#default_value" => $ddt_abuse_chat,
);

if ($_SESSION["ddt"]["abuse"]["search"]) {

if ($ddt_abuse_chat) {
$retval["abuse"]["chat_results"] = array(
"#type" => "item",
"#title" => "Chat Search Results",
"#value" => ddt_abuse_get_chat_results($ddt_abuse_chat),
);
}

}

}

$retval["abuse"]["submit"] = array(
"#type" => "submit",
"#value" => "Go!",
);

//
// All done with our search, reset this session variable!
//
//$no_unset_debug = true; // Debugging
if ($_SESSION["ddt"]["abuse"]["search"] && !$no_unset_debug) {
unset($_SESSION["ddt"]["abuse"]["search"]);
}

return($retval);

} // End of ddt_abuse_form()


function ddt_abuse_form_validate($form, $form_state) {
}


/**
* Our form submission handler.
*/
function ddt_abuse_form_submit($form, $form_state) {

$values = $form_state["values"];
//ddt_debug($values); // Debugging

$users = $values["users"];
$ips = $values["ips"];
$chat = $values["chat"];

variable_set("ddt_abuse_users", $users);
variable_set("ddt_abuse_ips", $ips);
variable_set("ddt_abuse_chat", $chat);

$_SESSION["ddt"]["abuse"]["search"] = true;

} // End of ddt_abuse_form_submit()


/**
* Search for the IP addresses of 1 or more users.
*
* @param string $ddt_abuse_users A comma-delimited string of usernames/UIDs.
*
* @return string HTML of IPs that each user has used.
*/
function ddt_abuse_get_user_ips($ddt_abuse_users) {

$retval = "";

//
// Get our array of users/UIDs and trim the whitespace from each.
//
$users = explode(",", $ddt_abuse_users);
//ddt_debug("Search criteria: " . print_r($users, true)); // Debugging
foreach ($users as $key => $value) {
$users[$key] = ltrim(rtrim($value));
}

//
// First, search by user ID.
// If we can't find the UID, then assume it's a user name and put into
// the $users_left array.
//
$uids = array();
$users_left = array();
foreach ($users as $key => $value) {

$user = user_load($value);
if ($user) {
$uids[$user->uid] = $user->uid;

} else {
$users_left[] = $value;

}

}

foreach ($users_left as $key => $value) {

$params = array("name" => $value);
$user = user_load($params);

if ($user) {
$uids[$user->uid] = $user->uid;

} else {
$error = t("Unable to find username '%name'!", array("%name" => $value));
drupal_set_message($error, "error");

}

}

//ddt_debug("UIDs: " . print_r($uids, true)); // Debugging

//
// Get IPs for all UIDs
//
$ips = array();
$query = "SELECT uid, hostname FROM {accesslog} "
. "WHERE "
. "uid IN (" . db_placeholders($uids, "int") . ") "
. "AND uid != 0 "
. "GROUP BY uid, hostname "
;
$query_args = $uids;
$cursor = db_query($query, $query_args);

while ($row = db_fetch_array($cursor)) {

$uid = $row["uid"];
$ip = $row["hostname"];

if (empty($ips[$uid])) {
$ips[$uid] = array();
}

$ips[$uid][] = $ip;

}

//
// Now turn our IPs into HTML
//
$user_list = array();
foreach ($ips as $key => $value) {

$user = user_load($key);
$username = $user->name;
$url = "user/" . $key;
$link = l($username, $url);

sort($value);
$ip_string = $link . ": " . join($value, ", ");
$user_list[] = $ip_string;
}

$retval = theme("item_list", $user_list);

return($retval);

} // End of ddt_abuse_get_user_ips()


/**
* Search for users from 1 or more IP addresses.
*
* @param string $ddt_abuse_users A comma-delimited string of IPs.
*
* @return string HTML of Users from each IP.
*/
function ddt_abuse_get_ip_users($ddt_abuse_ips) {

$retval = "";

//
// Get our array of IPs and trim the whitespace from each.
//
$ips = explode(",", $ddt_abuse_ips);
//ddt_debug("Search criteria: " . print_r($ips, true)); // Debugging
foreach ($ips as $key => $value) {
$ips[$key] = ltrim(rtrim($value));
}

//
// Now, loop through each IP and search the database
//
$ip_list = array();
foreach ($ips as $key => $value) {

$ip = $value;
$query = "SELECT uid FROM {accesslog} "
. "WHERE "
. "hostname LIKE '%s' "
. "GROUP BY uid "
;
$query_args = array($ip);
$cursor = db_query($query, $query_args);

while ($row = db_fetch_array($cursor)) {
$uid = $row["uid"];
if ($uid != 0) {

if (empty($ip_list[$ip])) {
$ip_list[$ip] = array();
}

$ip_list[$ip][]= $uid;

}

}

}

ksort($ip_list);

//
// Now create usernames and links for each IP
//
foreach ($ip_list as $key => $value) {

$ip = $value;

foreach ($ip as $key2 => $value2) {

$uid = $value2;
$user = user_load($uid);
$name = $user->name;
$url = l($name, "user/" . $uid);
$ip_list[$key][$key2] = $url;

}

}

//
// Now collapse each list of users into an array
//
foreach ($ip_list as $key => $value) {
$ip_list[$key] = $key . ": " . join($value, ", ");
}

//
// Finally, turn it into HTML
//
$retval = theme("item_list", $ip_list);

return($retval);

} // End of ddt_abuse_get_ip_users()


/**
* Get the datestamp of our oldest chatroom message.
*
* @return string A string of our oldest message date.
*/
function ddt_abuse_get_chat_oldest_message() {

$retval = "(No Messages Found)";

$query = "SELECT modified FROM {chatroom_msg} "
. "ORDER BY cmid "
. "LIMIT 1 "
;
$cursor = db_query($query);
$row = db_fetch_array($cursor);

if ($row && $row["modified"]) {
$retval = format_date($row["modified"]);
}

return($retval);

} // End of ddt_abuse_get_chat_oldest_message()


/**
* Search through chat for our string and get our results.
*
* @param string $ddt_abuse_chat Our string to search for
*
* @return string HTML of the matching chat room messages.
*/
function ddt_abuse_get_chat_results($ddt_abuse_chat) {

$retval = "";

//
// Take off whitespace, for sanity.
//
$ddt_abuse_chat = ltrim(rtrim($ddt_abuse_chat));

$max = 50;

$query = "SELECT uid, msg, modified "
. "FROM {chatroom_msg} "
. "WHERE "
. "msg LIKE '%%%s%%' "
. "ORDER BY cmid "
. "LIMIT $max "
;
$query_args = array($ddt_abuse_chat);
$cursor = db_query($query, $query_args);

$results = array();
while ($row = db_fetch_array($cursor)) {

$uid = $row["uid"];
$date = $row["modified"];
$message = $row["msg"];

$user = user_load($uid);
$name = $user->name;
$link = l ($name, "user/" . $uid);

$date_string = format_date($date, "custom", "r");

$result = $date_string . " " . $link . ": " . $message;
$results[] = $result;

}

if ($results) {
$retval = theme("item_list", $results);
}

if ($retval) {
$message = t("Maximum number of chat search results is currently: %max",
array("%max" => $max));
drupal_set_message($message);
}

return($retval);

} // End of ddt_abuse_get_chat_results()
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