digiproof/js/apphelpers.js

function CheckForEmptyDB() {
    var assets = App.Asset.find();
    var notempty = true;
    notempty = assets.forEach(function(asset) {
        return false;
    });
    return notempty;
}


// Convert hex string to ASCII.
// See http://stackoverflow.com/questions/11889329/word-array-to-string
function hex2a(hex) {
    var str = '';
    for (var i = 0; i < hex.length; i += 2)
        str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
    return str;
}

// decrypt data
function decryptimport(hash, data) {
    var clear = CryptoJS.AES.decrypt(data, hash);
    return unescape(hex2a(clear.toString()));
}



// from:
// http://ntt.cc/2008/01/19/base64-encoder-decoder-with-javascript.html
function decode64(input) {
    var output = "";
    var chr1, chr2, chr3 = "";
    var enc1, enc2, enc3, enc4 = "";
    var i = 0;

    var keyStr = "ABCDEFGHIJKLMNOP" +
        "QRSTUVWXYZabcdef" +
        "ghijklmnopqrstuv" +
        "wxyz0123456789+/" +
        "=";

    // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
    var base64test = /[^A-Za-z0-9\+\/\=]/g; //
    if (base64test.exec(input)) {
        alert("There were invalid base64 characters in the input text.\n" +
              "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +
              "Expect errors in decoding.");
    }
    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

    do {
        enc1 = keyStr.indexOf(input.charAt(i++));
        enc2 = keyStr.indexOf(input.charAt(i++));
        enc3 = keyStr.indexOf(input.charAt(i++));
        enc4 = keyStr.indexOf(input.charAt(i++));
	
        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;

        output = output + String.fromCharCode(chr1);

        if (enc3 != 64) {
           output = output + String.fromCharCode(chr2);
        }
        if (enc4 != 64) {
           output = output + String.fromCharCode(chr3);
        }

        chr1 = chr2 = chr3 = "";
        enc1 = enc2 = enc3 = enc4 = "";
	
    } while (i < input.length);
    
    return unescape(output);
}