使用EJS脚本实现花生壳动态域名更新服务（一）

浏览数：41 / 时间：2015年06月09日

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花生壳提供了动态域名服务，动态域名可实现几乎实时生效的DNS解析服务，并且花生壳还提供了webapi更新域名解析的服务。

通过EJS我们可以轻松调用花生壳提供的webapi服务实现动态域名更新功能。

注意：这个webapi是采用Http Basic Authentication（HTTP基本认证）的，因此账号和密码必须用BASE64(account:password)编码后放在请求头。具体实现请参考下面代码，Base64编码部分代码copy自互联网，版权由原作者所有。

代码如下：

clear()
/**
* UTF16和UTF8转换对照表
* U+00000000 – U+0000007F   0xxxxxxx
* U+00000080 – U+000007FF   110xxxxx 10xxxxxx
* U+00000800 – U+0000FFFF   1110xxxx 10xxxxxx 10xxxxxx
* U+00010000 – U+001FFFFF   11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
* U+00200000 – U+03FFFFFF   111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
* U+04000000 – U+7FFFFFFF   1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
*/
var Base64 = {
    // 转码表
    table : [
            ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘,
            ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘ ,‘P‘,
            ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘,
            ‘Y‘, ‘Z‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘,
            ‘g‘, ‘h‘, ‘i‘, ‘j‘, ‘k‘, ‘l‘, ‘m‘, ‘n‘,
            ‘o‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘, ‘v‘,
            ‘w‘, ‘x‘, ‘y‘, ‘z‘, ‘0‘, ‘1‘, ‘2‘, ‘3‘,
            ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘+‘, ‘/‘
    ],
    UTF16ToUTF8 : function(str) {
        var res = [], len = str.length;
        for (var i = 0; i < len; i++) {
            var code = str.charCodeAt(i);
            if (code > 0x0000 && code <= 0x007F) {
                // 单字节，这里并不考虑0x0000，因为它是空字节
                // U+00000000 – U+0000007F  0xxxxxxx
                res.push(str.charAt(i));
            } else if (code >= 0x0080 && code <= 0x07FF) {
                // 双字节
                // U+00000080 – U+000007FF  110xxxxx 10xxxxxx
                // 110xxxxx
                var byte1 = 0xC0 | ((code >> 6) & 0x1F);
                // 10xxxxxx
                var byte2 = 0x80 | (code & 0x3F);
                res.push(
                    String.fromCharCode(byte1), 
                    String.fromCharCode(byte2)
                );
            } else if (code >= 0x0800 && code <= 0xFFFF) {
                // 三字节
                // U+00000800 – U+0000FFFF  1110xxxx 10xxxxxx 10xxxxxx
                // 1110xxxx
                var byte1 = 0xE0 | ((code >> 12) & 0x0F);
                // 10xxxxxx
                var byte2 = 0x80 | ((code >> 6) & 0x3F);
                // 10xxxxxx
                var byte3 = 0x80 | (code & 0x3F);
                res.push(
                    String.fromCharCode(byte1), 
                    String.fromCharCode(byte2), 
                    String.fromCharCode(byte3)
                );
            } else if (code >= 0x00010000 && code <= 0x001FFFFF) {
                // 四字节
                // U+00010000 – U+001FFFFF  11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
            } else if (code >= 0x00200000 && code <= 0x03FFFFFF) {
                // 五字节
                // U+00200000 – U+03FFFFFF  111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
            } else /** if (code >= 0x04000000 && code <= 0x7FFFFFFF)*/ {
                // 六字节
                // U+04000000 – U+7FFFFFFF  1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
            }
        }
  
        return res.join(‘‘);
    },
    UTF8ToUTF16 : function(str) {
        var res = [], len = str.length;
        var i = 0;
        for (var i = 0; i < len; i++) {
            var code = str.charCodeAt(i);
            // 对第一个字节进行判断
            if (((code >> 7) & 0xFF) == 0x0) {
                // 单字节
                // 0xxxxxxx
                res.push(str.charAt(i));
            } else if (((code >> 5) & 0xFF) == 0x6) {
                // 双字节
                // 110xxxxx 10xxxxxx
                var code2 = str.charCodeAt(++i);
                var byte1 = (code & 0x1F) << 6;
                var byte2 = code2 & 0x3F;
                var utf16 = byte1 | byte2;
                res.push(Sting.fromCharCode(utf16));
            } else if (((code >> 4) & 0xFF) == 0xE) {
                // 三字节
                // 1110xxxx 10xxxxxx 10xxxxxx
                var code2 = str.charCodeAt(++i);
                var code3 = str.charCodeAt(++i);
                var byte1 = (code << 4) | ((code2 >> 2) & 0x0F);
                var byte2 = ((code2 & 0x03) << 6) | (code3 & 0x3F);
                var utf16 = ((byte1 & 0x00FF) << 8) | byte2
                res.push(String.fromCharCode(utf16));
            } else if (((code >> 3) & 0xFF) == 0x1E) {
                // 四字节
                // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
            } else if (((code >> 2) & 0xFF) == 0x3E) {
                // 五字节
                // 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
            } else /** if (((code >> 1) & 0xFF) == 0x7E)*/ {
                // 六字节
                // 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
            }
        }
  
        return res.join(‘‘);
    },
    encode : function(str) {
        if (!str) {
            return ‘‘;
        }
        var utf8    = this.UTF16ToUTF8(str); // 转成UTF8
        var i = 0; // 遍历索引
        var len = utf8.length;
        var res = [];
        while (i < len) {
            var c1 = utf8.charCodeAt(i++) & 0xFF;
            res.push(this.table[c1 >> 2]);
            // 需要补2个=
            if (i == len) {
                res.push(this.table[(c1 & 0x3) << 4]);
                res.push(‘==‘);
                break;
            }
            var c2 = utf8.charCodeAt(i++);
            // 需要补1个=
            if (i == len) {
                res.push(this.table[((c1 & 0x3) << 4) | ((c2 >> 4) & 0x0F)]);
                res.push(this.table[(c2 & 0x0F) << 2]);
                res.push(‘=‘);
                break;
            }
            var c3 = utf8.charCodeAt(i++);
            res.push(this.table[((c1 & 0x3) << 4) | ((c2 >> 4) & 0x0F)]);
            res.push(this.table[((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6)]);
            res.push(this.table[c3 & 0x3F]);
        }
  
        return res.join(‘‘);
    },
    decode : function(str) {
        if (!str) {
            return ‘‘;
        }
  
        var len = str.length;
        var i   = 0;
        var res = [];
  
        while (i < len) {
            code1 = this.table.indexOf(str.charAt(i++));
            code2 = this.table.indexOf(str.charAt(i++));
            code3 = this.table.indexOf(str.charAt(i++));
            code4 = this.table.indexOf(str.charAt(i++));
  
            c1 = (code1 << 2) | (code2 >> 4);
            c2 = ((code2 & 0xF) << 4) | (code3 >> 2);
            c3 = ((code3 & 0x3) << 6) | code4;
  
            res.push(String.fromCharCode(c1));
  
            if (code3 != 64) {
                res.push(String.fromCharCode(c2));
            }
            if (code4 != 64) {
                res.push(String.fromCharCode(c3));
            }
  
        }
  
        return this.UTF8ToUTF16(res.join(‘‘));
    }
};
/*
    good    更新成功，域名的IP地址已经更新，同时会返回本次更新成功的IP，用空格隔开，如：good 1.2.3.4
    nochg   更新成功，但没有改变IP。一般这种情况为本次提交的IP跟上一次的一样
    notfqdn 未有激活花生壳的域名
    nohost  域名不存在或未激活花生壳
    nochg   更新成功，但没有改变IP。一般这种情况为本次提交的IP跟上一次的一样
    abuse   请求失败，频繁请求或验证失败时会出现
    !donator    表示此功能需要付费用户才能使用，如https
    911 系统错误
*/
var hostname = prompt("请输入要更新的动态域名：");
var user = prompt("请输入账号：");
var pwd = prompt("请输入密码：");
var result = http.get("http://ddns.oray.com/ph/update?hostname=" + hostname, "User-Agent:Oray\nAuthorization:Basic " + Base64.encode(user + ":" + pwd), "utf-8");
console.log(result);