c#缩短查询字符串参数

Question

我需要将 URL 作为参数传递到我的查询字符串中，因为 URL 可能很长，我需要在传递时缩短 URL，然后能够在服务器端解密它们。

我尝试传递的 URL 不包含敏感信息，因此不需要字符串加密技术，我只是想将长字符串转换为短字符串并能够重建它回到一个字符串。

我已经尝试过 AES 加密并且它有效，但生成的字符串有时比 URL 值本身长。

到目前为止我尝试过的示例:

private static byte[] key = { 252, 217, 19, 11, 24, 26, 85, 45, 114, 184, 27, 162, 37, 112, 222, 209, 241, 24, 175, 144, 173, 53, 196, 29, 24, 26, 17, 218, 131, 236, 53, 209 };
private static byte[] vector = { 152, 64, 191, 111, 23, 3, 113, 119, 231, 121, 221, 112, 79, 32, 114, 156 };
private ICryptoTransform encryptor, decryptor;
private UTF8Encoding encoder;

public SimpleAES()
{
    RijndaelManaged rm = new RijndaelManaged();
    encryptor = rm.CreateEncryptor(key, vector);
    decryptor = rm.CreateDecryptor(key, vector);
    encoder = new UTF8Encoding();
}

public string Encrypt(string unencrypted)
{
    return Convert.ToBase64String(Encrypt(encoder.GetBytes(unencrypted)));
}

public string Decrypt(string encrypted)
{
    return encoder.GetString(Decrypt(Convert.FromBase64String(encrypted)));
}

public string EncryptToUrl(string unencrypted)
{ 
    return HttpUtility.UrlEncode(Encrypt(unencrypted));
}

public string DecryptFromUrl(string encrypted)
{
    return Decrypt(HttpUtility.UrlDecode(encrypted));
}

public byte[] Encrypt(byte[] buffer)
{
    return Transform(buffer, encryptor);
}

public byte[] Decrypt(byte[] buffer)
{
    return Transform(buffer, decryptor);
}

protected byte[] Transform(byte[] buffer, ICryptoTransform transform)
{
    MemoryStream stream = new MemoryStream();
    using (CryptoStream cs = new CryptoStream(stream, transform, CryptoStreamMode.Write))
    {
        cs.Write(buffer, 0, buffer.Length);
    }
    return stream.ToArray();
}

示例测试:

string unencrypted = "/exampleurl/this_is_a_long_string_the_length_of_this_url_is_112_charachters_/this_string_needs_to_be-shortened/"; 

var result = EncryptToUrl(unencrypted);    
"MHMyQdwbJpw8ah%2fbhAr2eJwTFa%2fyupemjuOVcBJmxTIdzcR0PZKCNSa5Fvi7kNrY3Kxlk5KWqAAEspWVtJfNjwwPs%2bCDGpC9Fn8CeGezWhXEbLT6CST2v%2fKpvptHVi3fBYSk1w3q1FYMx3C5DdKueQ%3d%3d" 

实际字符串长 112 个字符，结果长 165 个字符。

Answer 1

以下代码逐字摘自here .我复制了这个，因为问题不是重复的，但答案解决了这个问题提出的问题。当您调用 Zip 时，如果您打算将其包含在 URL 或其他内容中，则需要对结果进行 base64 编码以使其对浏览器友好。

public static void CopyTo(Stream src, Stream dest) {
    byte[] bytes = new byte[4096];

    int cnt;

    while ((cnt = src.Read(bytes, 0, bytes.Length)) != 0) {
        dest.Write(bytes, 0, cnt);
    }
}

public static byte[] Zip(string str) {
    var bytes = Encoding.UTF8.GetBytes(str);

    using (var msi = new MemoryStream(bytes))
    using (var mso = new MemoryStream()) {
        using (var gs = new GZipStream(mso, CompressionMode.Compress)) {
            //msi.CopyTo(gs);
            CopyTo(msi, gs);
        }

        return mso.ToArray();
    }
}

public static string Unzip(byte[] bytes) {
    using (var msi = new MemoryStream(bytes))
    using (var mso = new MemoryStream()) {
        using (var gs = new GZipStream(msi, CompressionMode.Decompress)) {
            //gs.CopyTo(mso);
            CopyTo(gs, mso);
        }

        return Encoding.UTF8.GetString(mso.ToArray());
    }
}

static void Main(string[] args) {
    byte[] r1 = Zip("StringStringStringStringStringStringStringStringStringStringStringStringStringString");
    string r2 = Unzip(r1);
}