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var indeces = require('../query/indeces');
// 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 = {};
}
// which layers to query
if('string' === typeof params.layers && params.layers.length){
var alias_layers = ['poi', 'admin'];
var alias_indeces = indeces.concat(alias_layers);
var layers = params.layers.split(',').map( function( layer ){
return layer.toLowerCase(); // lowercase inputs
});
for( var x=0; x<layers.length; x++ ){
if( -1 === alias_indeces.indexOf( layers[x] ) ){
return {
'error': true,
'message': 'invalid param \'layer\': must be one or more of ' + alias_indeces.join(',')
}
}
}
var expand_aliases = function(alias, layers, layer_indeces) {
var alias_index = layers.indexOf(alias);
if (alias_index !== -1 ) {
layers.splice(alias_index, 1);
layers = layers.concat(layer_indeces);
}
return layers;
}
layers = expand_aliases('poi', layers, ['geoname','osmnode','osmway']);
layers = expand_aliases('admin', layers, ['admin0','admin1','admin2','neighborhood']);
// de-dup
layers = layers.filter(function(item, pos) {
return layers.indexOf(item) == pos;
});
clean.layers = layers;
}
else {
clean.layers = indeces; // default (all layers)
}
req.clean = clean;
return { 'error': false };
}
// export function
module.exports = sanitize;