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var util = require( 'util' );
var isObject = require('is-object');
// validate inputs, convert types and apply defaults
module.exports = function sanitize( req, latlon_is_required ){
var clean = req.clean || {};
var params = req.query;
latlon_is_required = latlon_is_required || false;
// ensure the input params are a valid object
if( !isObject( params ) ){
params = {};
}
try {
sanitize_coord( 'lat', clean, params.lat, latlon_is_required );
sanitize_coord( 'lon', clean, params.lon, latlon_is_required );
sanitize_zoom_level(clean, params.zoom);
sanitize_bbox(clean, params.bbox);
}
catch (err) {
return {
'error': true,
'message': err.message
};
}
req.clean = clean;
return { 'error': false };
};
/**
* Parse and validate bbox parameter
* bbox = bottom_left lon, bottom_left lat, top_right lon, top_right lat
* bbox = left, bottom, right, top
* bbox = min Longitude, min Latitude, max Longitude, max Latitude
*
* @param {object} clean
* @param {string} param
*/
function sanitize_bbox( clean, param ) {
if( !param ) {
return;
}
var bboxArr = param.split( ',' );
if( Array.isArray( bboxArr ) && bboxArr.length === 4 ) {
var bbox = bboxArr.map(parseFloat);
if (bbox.some(isNaN)) {
return;
}
clean.bbox = {
right: Math.max( bbox[0], bbox[2] ),
top: Math.max( bbox[1], bbox[3] ),
left: Math.min( bbox[0], bbox[2] ),
bottom: Math.min( bbox[1], bbox[3] )
};
}
}
/**
* Validate lat,lon values
*
* @param {string} coord lat|lon
* @param {object} clean
* @param {string} param
* @param {bool} latlon_is_required
*/
function sanitize_coord( coord, clean, param, latlon_is_required ) {
var value = parseFloat( param );
if ( !isNaN( value ) ) {
clean[coord] = value;
}
else if (latlon_is_required) {
throw new Error( util.format( 'missing param \'%s\'', coord ) );
}
}
function sanitize_zoom_level( clean, param ) {
var zoom = parseInt( param, 10 );
if( !isNaN( zoom ) ){
clean.zoom = Math.min( Math.max( zoom, 1 ), 18 ); // max
}
}