api/sanitizer/_size.js

var check = require('check-types');

var MIN_SIZE = 1,
    MAX_SIZE = 40,
    DEFAULT_SIZE = 10;

// validate inputs, convert types and apply defaults
function setup( size_min, size_max, size_def ){

  // allow caller to inject custom min/max/default values
  if( !check.number( size_min ) ){ size_min = MIN_SIZE; }
  if( !check.number( size_max ) ){ size_max = MAX_SIZE; }
  if( !check.number( size_def ) ){ size_def = DEFAULT_SIZE; }

  return function sanitize( raw, clean ){

    // error & warning messages
    var messages = { errors: [], warnings: [] };

    // coercions
    clean.size = parseInt( raw.size, 10 );

    // invalid numeric input
    if( isNaN( clean.size ) ){
      clean.size = size_def;
    }
    // ensure size falls within defined range
    else if( clean.size > size_max ){
      // set the max size
      messages.warnings.push('out-of-range integer \'size\', using MAX_SIZE');
      clean.size = size_max;
    }
    else if( clean.size < size_min ){
      // set the min size
      messages.warnings.push('out-of-range integer \'size\', using MIN_SIZE');
      clean.size = size_min;
    }

    return messages;
  };
}

// export function
module.exports = setup;