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<?php
/**
* Elgg geo-location tagging library.
*
* @package Elgg
* @subpackage Core
*/
/**
* Encode a location into a latitude and longitude, caching the result.
*
* Works by triggering the 'geocode' 'location' plugin hook, and requires a geocoding module to be installed
* activated in order to work.
*
* @param String $location The location, e.g. "London", or "24 Foobar Street, Gotham City"
*/
function elgg_geocode_location($location) {
global $CONFIG;
// Handle cases where we are passed an array (shouldn't be but can happen if location is a tag field)
if (is_array($location)) {
$location = implode(', ', $location);
}
$location = sanitise_string($location);
// Look for cached version
$cached_location = get_data_row("SELECT * from {$CONFIG->dbprefix}geocode_cache WHERE location='$location'");
if ($cached_location) {
return array('lat' => $cached_location->lat, 'long' => $cached_location->long);
}
// Trigger geocode event if not cached
$return = false;
$return = trigger_plugin_hook('geocode', 'location', array('location' => $location), $return);
// If returned, cache and return value
if (($return) && (is_array($return))) {
$lat = (float)$return['lat'];
$long = (float)$return['long'];
// Put into cache at the end of the page since we don't really care that much
execute_delayed_write_query("INSERT DELAYED INTO {$CONFIG->dbprefix}geocode_cache (location, lat, `long`) VALUES ('$location', '{$lat}', '{$long}') ON DUPLICATE KEY UPDATE lat='{$lat}', `long`='{$long}'");
}
return $return;
}
/**
* Return entities within a given geographic area.
*
* @param real $lat Latitude
* @param real $long Longitude
* @param real $radius The radius
* @param string $type The type of entity (eg "user", "object" etc)
* @param string $subtype The arbitrary subtype of the entity
* @param int $owner_guid The GUID of the owning user
* @param string $order_by The field to order by; by default, time_created desc
* @param int $limit The number of entities to return; 10 by default
* @param int $offset The indexing offset, 0 by default
* @param boolean $count Set to true to get a count rather than the entities themselves (limits and offsets don't apply in this context). Defaults to false.
* @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
* @param int|array $container_guid The container or containers to get entities from (default: all containers).
* @return array A list of entities.
*/
function get_entities_in_area($lat, $long, $radius, $type = "", $subtype = "", $owner_guid = 0, $order_by = "", $limit = 10, $offset = 0, $count = false, $site_guid = 0, $container_guid) {
global $CONFIG;
if ($subtype === false || $subtype === null || $subtype === 0) {
return false;
}
$lat = (real)$lat;
$long = (real)$long;
$radius = (real)$radius;
$order_by = sanitise_string($order_by);
$limit = (int)$limit;
$offset = (int)$offset;
$site_guid = (int) $site_guid;
if ($site_guid == 0) {
$site_guid = $CONFIG->site_guid;
}
$where = array();
if (is_array($type)) {
$tempwhere = "";
if (sizeof($type)) {
foreach($type as $typekey => $subtypearray) {
foreach($subtypearray as $subtypeval) {
$typekey = sanitise_string($typekey);
if (!empty($subtypeval)) {
$subtypeval = (int) get_subtype_id($typekey, $subtypeval);
} else {
$subtypeval = 0;
}
if (!empty($tempwhere)) $tempwhere .= " or ";
$tempwhere .= "(e.type = '{$typekey}' and e.subtype = {$subtypeval})";
}
}
}
if (!empty($tempwhere)) {
$where[] = "({$tempwhere})";
}
} else {
$type = sanitise_string($type);
$subtype = get_subtype_id($type, $subtype);
if ($type != "") {
$where[] = "e.type='$type'";
}
if ($subtype!=="") {
$where[] = "e.subtype=$subtype";
}
}
if ($owner_guid != "") {
if (!is_array($owner_guid)) {
$owner_array = array($owner_guid);
$owner_guid = (int) $owner_guid;
$where[] = "e.owner_guid = '$owner_guid'";
} else if (sizeof($owner_guid) > 0) {
$owner_array = array_map('sanitise_int', $owner_guid);
// Cast every element to the owner_guid array to int
$owner_guid = implode(",",$owner_guid); //
$where[] = "e.owner_guid in ({$owner_guid})" ; //
}
if (is_null($container_guid)) {
$container_guid = $owner_array;
}
}
if ($site_guid > 0) {
$where[] = "e.site_guid = {$site_guid}";
}
if (!is_null($container_guid)) {
if (is_array($container_guid)) {
foreach($container_guid as $key => $val) $container_guid[$key] = (int) $val;
$where[] = "e.container_guid in (" . implode(",",$container_guid) . ")";
} else {
$container_guid = (int) $container_guid;
$where[] = "e.container_guid = {$container_guid}";
}
}
// Add the calendar stuff
$loc_join = "
JOIN {$CONFIG->dbprefix}metadata loc_start on e.guid=loc_start.entity_guid
JOIN {$CONFIG->dbprefix}metastrings loc_start_name on loc_start.name_id=loc_start_name.id
JOIN {$CONFIG->dbprefix}metastrings loc_start_value on loc_start.value_id=loc_start_value.id
JOIN {$CONFIG->dbprefix}metadata loc_end on e.guid=loc_end.entity_guid
JOIN {$CONFIG->dbprefix}metastrings loc_end_name on loc_end.name_id=loc_end_name.id
JOIN {$CONFIG->dbprefix}metastrings loc_end_value on loc_end.value_id=loc_end_value.id
";
$lat_min = $lat - $radius;
$lat_max = $lat + $radius;
$long_min = $long - $radius;
$long_max = $long + $radius;
$where[] = "loc_start_name.string='geo:lat'";
$where[] = "loc_start_value.string>=$lat_min";
$where[] = "loc_start_value.string<=$lat_max";
$where[] = "loc_end_name.string='geo:long'";
$where[] = "loc_end_value.string >= $long_min";
$where[] = "loc_end_value.string <= $long_max";
if (!$count) {
$query = "SELECT e.* from {$CONFIG->dbprefix}entities e $loc_join where ";
} else {
$query = "SELECT count(e.guid) as total from {$CONFIG->dbprefix}entities e $loc_join where ";
}
foreach ($where as $w) {
$query .= " $w and ";
}
$query .= get_access_sql_suffix('e'); // Add access controls
if (!$count) {
$query .= " order by n.calendar_start $order_by";
// Add order and limit
if ($limit) {
$query .= " limit $offset, $limit";
}
$dt = get_data($query, "entity_row_to_elggstar");
return $dt;
} else {
$total = get_data_row($query);
return $total->total;
}
}
/**
* List entities in a given location
*
* @param string $location Location
* @param string $type The type of entity (eg "user", "object" etc)
* @param string $subtype The arbitrary subtype of the entity
* @param int $owner_guid The GUID of the owning user
* @param int $limit The number of entities to display per page (default: 10)
* @param true|false $fullview Whether or not to display the full view (default: true)
* @param true|false $viewtypetoggle Whether or not to allow gallery view
* @param true|false $pagination Display pagination? Default: true
* @return string A viewable list of entities
*/
function list_entities_location($location, $type= "", $subtype = "", $owner_guid = 0, $limit = 10, $fullview = true, $viewtypetoggle = false, $navigation = true) {
return list_entities_from_metadata('location', $location, $type, $subtype, $owner_guid, $limit, $fullview, $viewtypetoggle, $navigation);
}
/**
* List items within a given geographic area.
*
* @param real $lat Latitude
* @param real $long Longitude
* @param real $radius The radius
* @param string $type The type of entity (eg "user", "object" etc)
* @param string $subtype The arbitrary subtype of the entity
* @param int $owner_guid The GUID of the owning user
* @param int $limit The number of entities to display per page (default: 10)
* @param true|false $fullview Whether or not to display the full view (default: true)
* @param true|false $viewtypetoggle Whether or not to allow gallery view
* @param true|false $pagination Display pagination? Default: true
* @return string A viewable list of entities
*/
function list_entities_in_area($lat, $long, $radius, $type= "", $subtype = "", $owner_guid = 0, $limit = 10, $fullview = true, $viewtypetoggle = false, $navigation = true) {
$offset = (int) get_input('offset');
$count = get_entities_in_area($lat, $long, $radius, $type, $subtype, $owner_guid, "", $limit, $offset, true);
$entities = get_entities_in_area($lat, $long, $radius, $type, $subtype, $owner_guid, "", $limit, $offset);
return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, $viewtypetoggle, $navigation);
}
// Some distances in degrees (approximate)
define("MILE", 0.01515);
define("KILOMETER", 0.00932);
// @todo get objects within x miles by entities, metadata and relationship
// @todo List
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