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var isObject = require('is-object'),
types = require('../query/types'),
get_layers = require('../helper/layers');
// validate inputs, convert types and apply defaults
function sanitize( req ){
var clean = req.clean || {};
var params= req.query;
clean.types = clean.types || {};
// ensure the input params are a valid object
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if( !isObject( params ) ){
params = {};
}
// default case (no layers specified in GET params)
// don't even set the from_layers key in this case
if('string' !== typeof params.layers || !params.layers.length){
return { 'error': false };
}
// decide which layers can be queried
var alias_layers = ['poi', 'admin', 'address'];
var alias_types = types.concat(alias_layers);
// parse GET params
var layers = params.layers.split(',').map( function( layer ){
return layer.toLowerCase(); // lowercase inputs
});
// validate layer names
for( var x=0; x<layers.length; x++ ){
if( -1 === alias_types.indexOf( layers[x] ) ){
return {
'error': true,
'message': 'invalid param \'layers\': must be one or more of ' + alias_types.join(',')
};
}
}
// pass validated params to next middleware
clean.types.from_layers = get_layers(layers);
req.clean = clean;
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return { 'error': false };
}
// export function
module.exports = sanitize;