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1 using System;
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2 using System.Text.RegularExpressions;
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3 using System.Web;
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4 using System.Web.Caching;
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5 using System.Configuration;
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6
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7 using PetShop.BusinessLogic;
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8
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9 namespace PetShop.Web
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10 {
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11 /// <summary>
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12 /// Collection of utility methods for web tier
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13 /// </summary>
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14 public static class WebUtility
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15 {
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16 /// <summary>
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17 /// Method to make sure that user's inputs are not malicious
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18 /// </summary>
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19 /// <param name="text">User's Input</param>
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20 /// <param name="maxLength">Maximum length of input</param>
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21 /// <returns>The cleaned up version of the input</returns>
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22 public static string InputText(string text, int maxLength)
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23 {
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24 text = text.Trim();
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25
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26 if (string.IsNullOrEmpty(text))
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27 return string.Empty;
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28
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29 text = Regex.Replace(text, "[\\s]{2,}", " "); // two or more spaces
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30 text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n"); // <br>
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31 text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+", " "); //
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32 text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty); // any other tags
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33 text = text.Replace("'", "''");
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34
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35 if (text.Length > maxLength)
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36 text = text.Substring(0, maxLength);
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37
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38 return text;
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39 }
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40
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41 /// <summary>
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42 /// Method to check whether input has other characters than numbers
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43 /// </summary>
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44 public static string CleanNonWord(string text)
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45 {
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46 return Regex.Replace(text, "\\W", "");
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47 }
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48
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49 /// <summary>
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50 /// Method to redirect user to search page
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51 /// </summary>
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52 /// <param name="key">Search keyword</param>
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53 public static void SearchRedirect(string key)
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54 {
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55 HttpContext.Current.Response.Redirect(
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56 string.Format("~/Search.aspx?keywords={0}", InputText(key, 255)));
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57 }
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58 }
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59 }
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