用node.js写个在Bash上对字符串进行Base64或URL的encode和decode脚本

一：自己这段时间经常要用到Base64编码和URL编码，写个编译型语言有点麻烦干脆就用node.js弄了个，弄好后在/etc/profile里加上alias就能完成工具的配置，先上代码：

function Base64() {

    if(typeof Base64._initialized == "undefined"){
    
    _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    
    // public method for encoding
    Base64.encode = function (input) {
            var output = "";
            var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
            var i = 0;
            input = _utf8Encode(input);
            while (i < input.length) {
        chr1 = input.charCodeAt(i++);
        chr2 = input.charCodeAt(i++);
        chr3 = input.charCodeAt(i++);
        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
        enc4 = chr3 & 63;
        if (isNaN(chr2)) {
                    enc3 = enc4 = 64;
        } else if (isNaN(chr3)) {
                    enc4 = 64;
        }
        output = output +
            _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
            _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
            }
            return output;
    }
    
    // public method for decoding
    Base64.decode = function (input) {
            var output = "";
            var chr1, chr2, chr3;
            var enc1, enc2, enc3, enc4;
            var i = 0;
            input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
            while (i < input.length) {
        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);
        }
            }
            output = _utf8Decode(output);
            return output;
    }
    
    // private method for UTF-8 encoding
    _utf8Encode = function (string) {
            string = string.replace(/\r\n/g,"\n");
            var utftext = "";
            for (var n = 0; n < string.length; n++) {
        var c = string.charCodeAt(n);
        if (c < 128) {
                    utftext += String.fromCharCode(c);
        } else if((c > 127) && (c < 2048)) {
                    utftext += String.fromCharCode((c >> 6) | 192);
                    utftext += String.fromCharCode((c & 63) | 128);
        } else {
                    utftext += String.fromCharCode((c >> 12) | 224);
                    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                    utftext += String.fromCharCode((c & 63) | 128);
        }
        
            }
            return utftext;
    }
    
    // private method for UTF-8 decoding
    _utf8Decode = function (utftext) {
            var string = "";
            var i = 0;
            var c = c1 = c2 = 0;
            while ( i < utftext.length ) {
        c = utftext.charCodeAt(i);
        if (c < 128) {
                    string += String.fromCharCode(c);
                    i++;
        } else if((c > 191) && (c < 224)) {
                    c2 = utftext.charCodeAt(i+1);
                    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                    i += 2;
        } else {
                    c2 = utftext.charCodeAt(i+1);
                    c3 = utftext.charCodeAt(i+2);
                    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                    i += 3;
        }
            }
            return string;
    }
    Base64._initialized = true;
    }
}

function URLXcoder() {
    if(typeof URLXcoder._initialized == "undefined"){
    URLXcoder.encode = encodeURIComponent;
    URLXcoder.decode = decodeURIComponent;
    URLXcoder._initialized == true;
    }
}

(function main(){
  Base64();
  URLXcoder();
  var type = process.argv[2];  // Base64 Or URLXcoder
  var mode = process.argv[3];  // Encoder Or Decoder
  var value = process.argv[4];  // message
  var out = "";
  if(mode == "en" || mode == "encode"){
    if(type == "base64"){
      out = Base64.encode(value);
    }else {
      out = URLXcoder.encode(value);
    }
  }else{
    if(type == "base64"){
      out = Base64.decode(value);
    }else {
      out = URLXcoder.decode(value);
    }
  }
  console.log(out);
})();

使用的时候注意字符串如果是bash的特殊字符如&等需要用\转义；

二：配置/etc/profile文件

在最后面加上alias base64='node /home/silentdoer/JsScripts/en-decoder.js base64'
 和alias urlxcoder='node /home/silentdoer/JsScripts/en-decoder.js urlxcoder'，然后source；

三：使用

在bash里输入urlxcoder en 好.=\&^，输出结果%E5%A5%BD.%3D%26%5E

输入base64 en 我时是，输出结果5oiR5pe25piv；

这里第一个参数表示以什么类型编码，第二个是encode还是decode（en和encode均可），第三个就是具体的字符串了（记得特殊字符要转义，或者用""或''括起来）