MikeCoder / MJsonViewer

scripts/utils.js

// ////////////////////////////////////////////////////////////////////////////////////
// Copyright © 2017 TangDongxin
//
// Permission is hereby granted, free of charge, to any person obtaining
// A copy of this software and associated documentation files (the "Software"),
// To deal in the Software without restriction, including without limitation
// The rights to use, copy, modify, merge, publish, distribute, sublicense,
// And/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// In all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// ////////////////////////////////////////////////////////////////////////////////////


// ===========================================
// UTIL TOOLS
// ===========================================


function isBASE64 (str) {

  try {

    const res = new Buffer(a, 'base64').toString();
    return res != undefined;

Comparing res to undefined using the != operator is not safe. Consider using !== instead.

  } catch (e) {

    return false;

  }

}

function isJSON (str) {

  if (typeof str === 'string') {

    try {

      if (str[0] == '"') {

        str = eval(str);

      }

    } catch (e) {

Empty catch clauses should be used with caution; consider adding a comment why this is needed.

      // here we just ignore the result
      // dlog(e);

    }


    try {

      const obj = eval(`(${ str })`);

      if (str[0] == '{' || str[0] == '[') {

        return true;

      }

    } catch (e) {

      dlog(e);

    }

  }
  return false;

}

function isLink (str) {

  if (str.startsWith('http') || str.startsWith('mailto') || str.startsWith('\'http') || str.startsWith('"http')) {

    str = eval(str);

  }

  const regex = /^http(s)?:\/\/([\w-]+\.)+[\w-]+(\/[\w- ./?%&=]*)?$/;
  return regex.test(str);

}


function showPopup (str, div) {

  div.innerHTML = str;

}