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// validate inputs, convert types and apply defaults
function sanitize( req ){
var clean = req.clean || {};
var params= req.query;
// ensure the input params are a valid object
if( Object.prototype.toString.call( params ) !== '[object Object]' ){
params = {};
}
var is_invalid_lat = function(lat) {
return isNaN( lat ) || lat < -90 || lat > 90;
};
var is_invalid_lon = function(lon) {
return isNaN( lon ) || lon < -180 || lon > 180;
};
// lat
if (!isNaN(params.lat)) {
var lat = parseFloat( params.lat, 10 );
if( is_invalid_lat(lat) ){
return {
'error': true,
'message': 'invalid param \'lat\': must be >-90 and <90'
};
}
clean.lat = lat;
}
// lon
if (!isNaN(params.lon)) {
var lon = parseFloat( params.lon, 10 );
if( is_invalid_lon(lon) ){
return {
'error': true,
'message': 'invalid param \'lon\': must be >-180 and <180'
};
}
clean.lon = lon;
}
// zoom level
var zoom = parseInt( params.zoom, 10 );
if( !isNaN( zoom ) ){
clean.zoom = Math.min( Math.max( zoom, 1 ), 18 ); // max
}
// bbox
// bbox = bottom_left lat, bottom_left lon, top_right lat, top_right lon
// bbox = left,bottom,right,top
// bbox = min Longitude , min Latitude , max Longitude , max Latitude
if (params.bbox) {
var bbox = [];
var bboxArr = params.bbox.split(',');
if( Array.isArray(bboxArr) && bboxArr.length === 4 ) {
bbox = bboxArr.filter(function(latlon, index) {
latlon = parseFloat(latlon, 10);
return !(index % 2 === 0 ? is_invalid_lat(latlon) : is_invalid_lon(latlon));
});
if (bbox.length === 4) {
clean.bbox = {
top : Math.max(bbox[0], bbox[2]),
right : Math.max(bbox[1], bbox[3]),
bottom: Math.min(bbox[0], bbox[2]),
left : Math.min(bbox[1], bbox[3])
};
} else {
return {
'error': true,
'message': 'invalid bbox'
};
}
}
}
req.clean = clean;
return { 'error': false };
}
// export function
module.exports = sanitize;