95 lines
4.1 KiB
PHP
95 lines
4.1 KiB
PHP
<?php
|
|
|
|
namespace okapi\services\caches\search\bbox;
|
|
|
|
require_once('searching.inc.php');
|
|
|
|
use okapi\Okapi;
|
|
use okapi\OkapiRequest;
|
|
use okapi\ParamMissing;
|
|
use okapi\InvalidParam;
|
|
use okapi\services\caches\search\SearchAssistant;
|
|
|
|
class WebService
|
|
{
|
|
public static function options()
|
|
{
|
|
return array(
|
|
'min_auth_level' => 1
|
|
);
|
|
}
|
|
|
|
public static function call(OkapiRequest $request)
|
|
{
|
|
# You may wonder, why there are no parameters like "bbox" or "center" in the
|
|
# "search/all" method. This is *intentional* and should be kept this way.
|
|
# Such parameters would fall in conflict with each other and - in result -
|
|
# make the documentation very fuzzy. That's why they were intentionally
|
|
# left out of the "search/all" method, and put in separate (individual) ones.
|
|
# It's much easier to grasp their meaning this way.
|
|
|
|
$tmp = $request->get_parameter('bbox');
|
|
if (!$tmp)
|
|
throw new ParamMissing('bbox');
|
|
$parts = explode('|', $tmp);
|
|
if (count($parts) != 4)
|
|
throw new InvalidParam('bbox', "Expecting 4 pipe-separated parts, got ".count($parts).".");
|
|
foreach ($parts as &$part_ref)
|
|
{
|
|
if (!preg_match("/^-?[0-9]+(\.?[0-9]*)$/", $part_ref))
|
|
throw new InvalidParam('bbox', "'$part_ref' is not a valid float number.");
|
|
$part_ref = floatval($part_ref);
|
|
}
|
|
list($bbsouth, $bbwest, $bbnorth, $bbeast) = $parts;
|
|
if ($bbnorth <= $bbsouth)
|
|
throw new InvalidParam('bbox', "Northern edge must be situated to the north of the southern edge.");
|
|
if ($bbeast == $bbwest)
|
|
throw new InvalidParam('bbox', "Eastern edge longitude is the same as the western one.");
|
|
if ($bbnorth > 90 || $bbnorth < -90 || $bbsouth > 90 || $bbsouth < -90)
|
|
throw new InvalidParam('bbox', "Latitudes have to be within -90..90 range.");
|
|
if ($bbeast > 180 || $bbeast < -180 || $bbwest > 180 || $bbwest < -180)
|
|
throw new InvalidParam('bbox', "Longitudes have to be within -180..180 range.");
|
|
|
|
# Construct SQL conditions for the specified bounding box.
|
|
|
|
$search_assistant = new SearchAssistant($request);
|
|
$search_assistant->prepare_common_search_params();
|
|
$search_assistant->prepare_location_search_params();
|
|
|
|
$where_conds = array();
|
|
$where_conds[] = $search_assistant->get_latitude_expr()." between '".mysql_real_escape_string($bbsouth)."' and '".mysql_real_escape_string($bbnorth)."'";
|
|
if ($bbeast > $bbwest)
|
|
{
|
|
# Easy one.
|
|
$where_conds[] = $search_assistant->get_longitude_expr()." between '".mysql_real_escape_string($bbwest)."' and '".mysql_real_escape_string($bbeast)."'";
|
|
}
|
|
else
|
|
{
|
|
# We'll have to assume that this box goes through the 180-degree meridian.
|
|
# For example, $bbwest = 179 and $bbeast = -179.
|
|
$where_conds[] = "(".$search_assistant->get_longitude_expr()." > '".mysql_real_escape_string($bbwest)
|
|
."' or ".$search_assistant->get_longitude_expr()." < '".mysql_real_escape_string($bbeast)."')";
|
|
}
|
|
|
|
#
|
|
# In the method description, we promised to return caches ordered by the *rough*
|
|
# distance from the center of the bounding box. We'll use ORDER BY with a simplified
|
|
# distance formula and combine it with the LIMIT clause to get the best results.
|
|
#
|
|
|
|
$center_lat = ($bbsouth + $bbnorth) / 2.0;
|
|
$center_lon = ($bbwest + $bbeast) / 2.0;
|
|
|
|
$search_params = $search_assistant->get_search_params();
|
|
$search_params['where_conds'] = array_merge($where_conds, $search_params['where_conds']);
|
|
$search_params['order_by'][] = Okapi::get_distance_sql($center_lat, $center_lon,
|
|
$search_assistant->get_latitude_expr(),
|
|
$search_assistant->get_longitude_expr()); # not replaced; added to the end!
|
|
$search_assistant->set_search_params($search_params);
|
|
|
|
$result = $search_assistant->get_common_search_result();
|
|
|
|
return Okapi::formatted_response($request, $result);
|
|
}
|
|
}
|