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2 package nabble.view.web.tools;
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3
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4 import nabble.model.DailyNumber;
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5 import nabble.model.ModelException;
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6 import nabble.model.Person;
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7 import nabble.model.SystemProperties;
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8 import nabble.model.User;
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9 import nabble.view.lib.Jtp;
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10 import nabble.view.lib.Shared;
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11 import org.slf4j.Logger;
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12 import org.slf4j.LoggerFactory;
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13
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14 import javax.servlet.ServletException;
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15 import javax.servlet.http.HttpServlet;
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16 import javax.servlet.http.HttpServletRequest;
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17 import javax.servlet.http.HttpServletResponse;
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18 import java.io.IOException;
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19 import java.io.PrintWriter;
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20 import java.util.ArrayList;
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21 import java.util.List;
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22 import java.util.regex.Pattern;
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23
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24
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25 public final class SpamRules extends HttpServlet {
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26
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27 private static final Logger logger = LoggerFactory.getLogger(SpamRules.class);
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28
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29 private static final List<Rule> RULES = new ArrayList<Rule>();
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30
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31 static {
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32 String spamRules = SystemProperties.get("spam.rules");
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33 if (spamRules != null)
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34 RULES.addAll(parseRules(spamRules));
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35 }
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36
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37 private interface Rule {
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38 public String checkSubject(String subject) throws ModelException.SpamException;
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39 public String checkMessage(String message, Person visitor) throws ModelException.SpamException;
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40 }
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41 /*
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42 public static void checkSubject(HttpServletRequest request, String subject)
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43 throws ModelException.SpamException
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44 {
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45 if (subject == null)
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46 return;
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47
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48 // Removes duplicated space chars
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49 subject = subject.replaceAll("[ ]+"," ");
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50 for (Rule rule : RULES) {
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51 try {
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52 rule.checkSubject(subject);
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53 } catch (ModelException.SpamException e) {
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54 DailyNumber.blockedSpams.inc();
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55 if (request != null)
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56 logger.info("host="+request.getServerName()+" | IP=" + Jtp.getClientIpAddr(request) + " | " + e.getMessage());
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57 else
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58 logger.info("Blocked Mail | " + e.getMessage());
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59 throw e;
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60 }
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61 }
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62 }
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63
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64 public static void checkMessage(HttpServletRequest request, String message, Person visitor)
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65 throws ModelException.SpamException
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66 {
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67 if (message == null)
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68 return;
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69
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70 // Removes duplicated space chars
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71 message = message.replaceAll("[ ]+"," ");
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72 for (Rule rule : RULES) {
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73 try {
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74 rule.checkMessage(message, visitor);
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75 } catch (ModelException.SpamException e) {
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76 DailyNumber.blockedSpams.inc();
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77 String email = visitor instanceof User? ((User) visitor).getEmail() : "NO EMAIL";
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78 if (request != null)
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79 logger.info("host="+request.getServerName()+" | IP=" + Jtp.getClientIpAddr(request) + " | " + email + " | " + e.getMessage());
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80 else
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81 logger.info("Blocked Mail | " + email + " | " + e.getMessage());
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82 throw e;
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83 }
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84 }
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85 }
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86 */
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87 protected void service(HttpServletRequest request,HttpServletResponse response)
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88 throws ServletException, IOException
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89 {
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90 String spamRules = SystemProperties.get("spam.rules");
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91
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92 if ("save".equals(request.getParameter("action"))) {
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93 String rules = request.getParameter("rules");
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94 RULES.clear();
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95 if (rules != null && rules.length() > 0) {
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96 List<Rule> r = parseRules(rules);
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97 if (r.size() > 0)
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98 RULES.addAll(r);
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99 }
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100 SystemProperties.set("spam.rules", rules);
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101 response.sendRedirect("/tools/");
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102 return;
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103 }
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104
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105 PrintWriter out = response.getWriter();
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106
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107 out.print( "\n<html>\n <head>\n <script src=\"" );
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108 out.print( (Shared.getJQueryPath()) );
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109 out.print( "\"></script>\n <link rel=\"stylesheet\" href=\"" );
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110 out.print( (Shared.getCssPath()) );
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111 out.print( "\" type=\"text/css\" />\n </head>\n <body>\n <div>\n <a href=\"/tools/\">Tools</a>\n </div>\n <h1>Spam Rules</h1>\n <div id=\"nabble\" class=\"nabble\">\n <form action=\"/tools/SpamRules.jtp\" method=\"POST\">\n <input type=\"hidden\" name=\"action\" value=\"save\">\n <textarea name=\"rules\" rows=15 style=\"width:80%\">" );
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112 out.print( (Jtp.hideNull(spamRules)) );
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113 out.print( "</textarea>\n <br>\n <input type=\"submit\" value=\"Save Rules\">\n </form>\n </div>\n </body>\n</html>\n" );
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114
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115 }
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116
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117 private static synchronized List<Rule> parseRules(String rules) {
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118 List<Rule> r = new ArrayList<Rule>();
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119 String[] lines = rules.split("\n");
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120 for (String line : lines) {
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121 if (line.length() == 0 || line.startsWith("#")) {
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122 // do nothing
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123 } else if (line.startsWith("subject-contains:"))
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124 r.add(new SubjectContainsRule(line.substring("subject-contains:".length()).trim()));
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125 else if (line.startsWith("message-contains:"))
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126 r.add(new MessageContainsRule(line.substring("message-contains:".length()).trim()));
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127 else if (line.startsWith("message-contains-pattern:"))
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128 r.add(new MessageContainsPattern(line.substring("message-contains-pattern:".length()).trim()));
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129 else if (line.startsWith("message-word-count:"))
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130 r.add(new WordCountRule(line.substring("message-word-count:".length()).trim()));
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131 else if (line.startsWith("subject-max-words:"))
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132 r.add(new SubjectMaxWordsRule(line.substring("subject-max-words:".length()).trim()));
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133 else if (line.startsWith("message-max-words:"))
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134 r.add(new MessageMaxWordsRule(line.substring("message-max-words:".length()).trim()));
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135 else if (line.startsWith("user-email-pattern:"))
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136 r.add(new UserEmailPattern(line.substring("user-email-pattern:".length()).trim()));
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137 }
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138 return r;
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139 }
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140
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141 private static class SubjectContainsRule implements Rule {
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142 private String text;
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143 private String[] parts;
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144 public SubjectContainsRule(String text) {
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145 this.text = text;
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146 this.parts = text.toLowerCase().split("\\+");
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147 }
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148 public String checkSubject(String subject)
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149 throws ModelException.SpamException
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150 {
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151 if (subject == null) return null;
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152 subject = subject.toLowerCase();
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153 for (String part : parts) {
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154 if (subject.indexOf(part) == -1)
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155 return null;
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156 }
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157 throw new ModelException.SubjectContainsInvalidWord(text);
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158 }
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159 public String checkMessage(String message, Person visitor) { return null; }
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160 }
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161
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162 private static class SubjectMaxWordsRule implements Rule {
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163 private int max;
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164 private String[] parts;
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165 public SubjectMaxWordsRule(String text) {
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166 String[] params = text.split("\\|");
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167 this.max = Integer.valueOf(params[0]);
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168 this.parts = params[1].toLowerCase().split("\\+");
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169 }
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170 public String checkSubject(String subject)
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171 throws ModelException.SpamException
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172 {
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173 if (subject == null) return null;
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174 subject = subject.toLowerCase();
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175 int count = 0;
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176 for (String part : parts) {
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177 if (subject.indexOf(part) >= 0)
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178 count++;
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179 if (count >= max)
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180 throw new ModelException.SubjectContainsCommonSpamWords(subject);
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181 }
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182 return null;
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183 }
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184 public String checkMessage(String message, Person visitor) { return null; }
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185 }
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186
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187 private static class MessageMaxWordsRule implements Rule {
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188 private int max;
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189 private String[] parts;
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190 public MessageMaxWordsRule(String text) {
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191 String[] params = text.split("\\|");
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192 this.max = Integer.valueOf(params[0]);
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193 this.parts = params[1].toLowerCase().split("\\+");
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194 }
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195 public String checkMessage(String message, Person visitor)
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196 throws ModelException.SpamException
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197 {
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198 if (message == null) return null;
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199 message = message.toLowerCase();
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200 int count = 0;
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201 for (String part : parts) {
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202 if (message.indexOf(part) >= 0)
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203 count++;
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204 if (count >= max)
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205 throw new ModelException.MessageContainsCommonSpamWords(message);
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206 }
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207 return null;
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208 }
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209 public String checkSubject(String subject) { return null; }
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210 }
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211
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212 private static class MessageContainsRule implements Rule {
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213 private String text;
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214 private String[] parts;
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215 public MessageContainsRule(String text) {
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216 this.text = text;
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217 this.parts = text.toLowerCase().split("\\+");
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218 }
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219 public String checkMessage(String message, Person visitor)
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220 throws ModelException.SpamException
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221 {
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222 if (message == null) return null;
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223 String msg = message.toLowerCase();
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224 for (String part : parts) {
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225 if (msg.indexOf(part) == -1)
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226 return null;
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227 }
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228 throw new ModelException.MessageContainsInvalidWord(text);
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229 }
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230 public String checkSubject(String subject) { return null; }
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231 }
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232
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233 private static class MessageContainsPattern implements Rule {
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234 private Pattern[] pattern;
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235 public MessageContainsPattern(String patternList) {
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236 String[] patterns = patternList.split("____");
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237 this.pattern = new Pattern[patterns.length];
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238 for (int i = 0; i < patterns.length; i++)
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239 this.pattern[i] = Pattern.compile(patterns[i]);
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240 }
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241 public String checkMessage(String message, Person visitor)
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242 throws ModelException.SpamException
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243 {
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244 if (message == null) return null;
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245 for (Pattern p : pattern) {
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246 if (!p.matcher(message).find())
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247 return null;
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248 }
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249 throw new ModelException.MessageContainsCommonSpamWords(message);
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250 }
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251 public String checkSubject(String subject) { return null; }
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252 }
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253
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254 private static class UserEmailPattern implements Rule {
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255 private Pattern pattern;
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256 public UserEmailPattern(String pattern) {
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257 this.pattern = Pattern.compile(pattern);
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258 }
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259 public String checkMessage(String message, Person visitor)
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260 throws ModelException.SpamException
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261 {
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262 if (visitor instanceof User) {
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263 String email = ((User) visitor).getEmail();
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264 if (!pattern.matcher(email).matches())
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265 return null;
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266 throw new ModelException.MessageContainsInvalidWord("EMAIL: " + email);
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267 }
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268 return null;
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269 }
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270 public String checkSubject(String subject) { return null; }
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271 }
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272
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273 private static class WordCountRule implements Rule {
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274 private String text;
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275 private int count;
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276 public WordCountRule(String value) {
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277 String[] values = value.split(">");
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278 this.text = values[0].toLowerCase();
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279 this.count = Integer.valueOf(values[1]);
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280 }
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281 public String checkMessage(String message, Person visitor)
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282 throws ModelException.SpamException
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283 {
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284 if (message == null) return null;
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285 String msg = message.toLowerCase();
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286 int oldPos = 0;
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287 int newPos = msg.indexOf(text);
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288 int c = 0;
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289 while (newPos > oldPos) {
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290 c++;
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291 if (c >= count)
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292 throw new ModelException.MessageContainsManyInvalidWords(text);
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293 oldPos = newPos;
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294 newPos = msg.indexOf(text, oldPos+text.length());
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295 }
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296 return null;
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297 }
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298 public String checkSubject(String subject) { return null; }
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299 }
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300 }
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301
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