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using System;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Data;
using MySql.Data.MySqlClient;
using System.Data.Common;
using System.Globalization;
using System.IO;
using System.Security.Cryptography;
namespace Meeting {
public class MyBase : Page {
//
// Notice that am including this because Gonzalo forced me to!
//
string create_table = "create table Meeting ( id int not null auto_increment primary key, name varchar(100) unique not null, email varchar(100) not null, country varchar (50) not null, comment blob not null, validated int default 0 );";
static string constr;
static IDbConnection GetConnection ()
{
if (constr == null){
using (Stream str = File.OpenRead ("/etc/connection-string")){
Console.WriteLine ("reading");
constr = new StreamReader (str).ReadLine ();
}
}
IDbConnection cnc = new MySqlConnection(constr);
cnc.Open ();
return cnc;
}
static IDbDataParameter CreateParameter (IDbCommand cmd, string name, string val)
{
IDbDataParameter par = cmd.CreateParameter ();
par.ParameterName = name;
par.Value = val;
par.DbType = DbType.String;
return par;
}
static int InsertNew (string name, string email, string country, string comment)
{
if (name == null || email == null || country == null || comment == null)
throw new ArgumentNullException ();
using (IDbConnection cnc = GetConnection ()){
IDbCommand cmd = cnc.CreateCommand ();
//cmd.CommandText = "INSERT INTO Meeting set name = @name, email = @email, country = @country, comment = @comment ;";
cmd.CommandText = "INSERT INTO Meeting (name, email, country, comment) VALUES (?name, ?email, ?country, ?comment)";
cmd.Parameters.Add (CreateParameter (cmd, "?name", name));
cmd.Parameters.Add (CreateParameter (cmd, "?email", email));
cmd.Parameters.Add (CreateParameter (cmd, "?country", country));
cmd.Parameters.Add (CreateParameter (cmd, "?comment", comment));
try {
cmd.ExecuteNonQuery ();
} catch (MySqlException m){
// Duplicate entry
if (m.Number != 1062)
throw;
}
cmd.Dispose ();
cmd = cnc.CreateCommand ();
cmd.CommandText = "SELECT id FROM Meeting WHERE name = ?name";
cmd.Parameters.Add (CreateParameter (cmd, "?name", name));
IDataReader reader = cmd.ExecuteReader ();
if (reader.Read () == false)
throw new Exception ("Reader.Read is false");
return (int) reader.GetValue (0);
}
}
static string MakeHash (int number)
{
using (Stream s = File.OpenRead ("/etc/clave")){
byte [] buffer = new byte [100];
int n = s.Read (buffer, 4, 96);
buffer [0] = (byte) (number & 0xff);
buffer [1] = (byte) ((number >> 8) & 0xff);
buffer [2] = (byte) ((number >> 16) & 0xff);
buffer [3] = (byte) ((number >> 24) & 0xff);
byte [] hash = SHA1.Create ().ComputeHash (buffer, 0, n+4);
return Convert.ToBase64String (hash);
}
}
static string GenerateToken (int idx)
{
return String.Format ("{0}:{1}", idx, HttpUtility.UrlEncode (MakeHash (idx)));
}
public static void ValidateToken (string token)
{
int p = token.IndexOf (':');
if (p == -1)
throw new Exception ("Invalid token format");
int uid = (int) UInt32.Parse (token.Substring (0, p));
string hash = token.Substring (p+1);
if (MakeHash (uid) != hash)
throw new Exception ("Tampered token");
using (IDbConnection cnc = GetConnection ()){
IDbCommand cmd;
cmd = cnc.CreateCommand ();
cmd.CommandText = "UPDATE Meeting SET validated = 1 WHERE id = " + uid.ToString (CultureInfo.InvariantCulture);
cmd.ExecuteNonQuery ();
}
}
public static string InsertData (string name, string email, string country, string comment)
{
int idx = InsertNew (name, email, country, comment);
return GenerateToken (idx);
}
}
}