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//
// Copyright (C) 2009,2010 Bartek thindil Jasicki
//
// This file is part of Grubng
//
// Grubng is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
using System;
using System.Text;
using System.Text.RegularExpressions;
namespace urlsdb
{
/// <summary>
/// Class provide functions for manipulate URL's
/// </summary>
internal sealed class ParseURLs
{
System.Security.Cryptography.SHA1Managed SHhash;
StringBuilder key;
byte[] HashValue;
byte[] PureHash;
/// <summary>
/// Standard class constructor.
/// </summary>
public ParseURLs()
{
this.SHhash = new System.Security.Cryptography.SHA1Managed();
this.key = new StringBuilder();
}
/// <summary>
/// Function manipulate URL - check it correctness, drop to lower case host.
/// </summary>
/// <param name="url">
/// A <see cref="System.String"/> URL to parse.
/// </param>
/// <returns>
/// A <see cref="System.String"/> parsed URL or String.Empty if URL is invalid.
/// </returns>
public static string ParseURL(string url)
{
//Remove http(s):// from URL
int index = url.IndexOf("//");
if (index > 0)
{
url = url.Remove(0, (index + 2));
}
//Check correctness of URL
if (!Regex.IsMatch(url, @"^[a-z0-9]+([a-z0-9\=\-\.\?\,\'\/\\\+&%\$#_~]*)?$", RegexOptions.IgnoreCase))
{
return String.Empty;
}
//Conver to lower case host name
index = url.IndexOf('/');
string host, path;
if (index > 0)
{
host = url.Substring(0, index);
path = url.Substring(index);
}
else
{
host = url;
path = "/";
}
host = host.ToLower();
//Validate hostname
if (!Regex.IsMatch(host, @"^[a-z0-9]+([a-z0-9\-\.]*)?$", RegexOptions.IgnoreCase))
{
return String.Empty;
}
//Remove PHPSESID from path
if (path.Length > 1)
{
path = Regex.Replace(path, @"(&|\?|&)*PHPSESSID=\w+", String.Empty, RegexOptions.IgnoreCase);
}
url = host + path;
url = System.Web.HttpUtility.UrlEncode(host + path);
url = url.Replace("%2f", "/");
url = url.Replace("%2c", ",");
url = url.Replace("%3d", "=");
url = url.Replace("%3f", "?");
url = url.Replace("%26", "&");
url = url.Replace("%3b", ";");
url = url.Replace("%3a", ":");
url = url.Replace("%40", "@");
url = url.Replace("%23", "#");
url = url.Replace("%7e", "~");
url = url.Replace("%252f", "/");
return url;
}
/// <summary>
/// Function return SHA1 hash of URL
/// </summary>
/// <param name="url">
/// A <see cref="System.String"/> URL to hash
/// </param>
/// <returns>
/// A <see cref="System.String"/> SHA1 hash of URL
/// </returns>
public string GetHash(string url)
{
if (this.key.Length > 0)
{
this.key.Remove(0, key.Length);
}
this.PureHash = Encoding.UTF8.GetBytes(url);
this.HashValue = SHhash.ComputeHash(this.PureHash);
foreach(byte b in this.HashValue)
{
this.key.Append(String.Format("{0:x2}", b));
}
return this.key.ToString();
}
}
}
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