Add the "fast email check"

diff --git a/src/org/cacert/gigi/pages/main/Signup.java b/src/org/cacert/gigi/pages/main/Signup.java
index b13b374fbae105f5fcb2ed864eed8670e1c632b5..4c44c37fe4a59a9e0e4054f3aa714735d3d4b1c4 100644 (file)
--- a/src/org/cacert/gigi/pages/main/Signup.java
+++ b/src/org/cacert/gigi/pages/main/Signup.java
@@ -1,5 +1,6 @@
 package org.cacert.gigi.pages.main;
 
+import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.io.UnsupportedEncodingException;
@@ -18,6 +19,7 @@ import org.cacert.gigi.database.DatabaseConnection;
 import org.cacert.gigi.output.DateSelector;
 import org.cacert.gigi.output.Template;
 import org.cacert.gigi.pages.Page;
+import org.cacert.gigi.util.EmailChecker;
 import org.cacert.gigi.util.HTMLEncoder;
 
 public class Signup {
@@ -158,7 +160,37 @@ public class Signup {
                        e.printStackTrace();
                        failed = true;
                }
-               // TODO fast-check mail
+               String mailResult = EmailChecker.FAIL;
+               try {
+                       mailResult = EmailChecker.checkEmailServer(0, buildup.getEmail());
+               } catch (IOException e) {
+               }
+               if (!mailResult.equals(EmailChecker.OK)) {
+                       if (mailResult.startsWith("4")) {
+                               outputError(
+                                               out,
+                                               req,
+                                               "The mail server responsible for your domain indicated"
+                                                               + " a temporary failure. This may be due to anti-SPAM measures, such"
+                                                               + " as greylisting. Please try again in a few minutes.");
+                       } else {
+                               outputError(
+                                               out,
+                                               req,
+                                               "Email Address given was invalid, or a test connection"
+                                                               + " couldn't be made to your server, or the server"
+                                                               + " rejected the email address as invalid");
+                       }
+                       if (mailResult.equals(EmailChecker.FAIL)) {
+                               outputError(out, req,
+                                               "Failed to make a connection to the mail server");
+                       } else {
+                               out.print("<div>");
+                               out.print(mailResult);
+                               out.println("</div>");
+                       }
+                       failed = true;
+               }
 
                out.println("</div>");
                if (failed) {

diff --git a/src/org/cacert/gigi/util/EmailChecker.java b/src/org/cacert/gigi/util/EmailChecker.java
new file mode 100644 (file)
index 0000000..00c6738
--- /dev/null
+++ b/src/org/cacert/gigi/util/EmailChecker.java
@@ -0,0 +1,123 @@
+package org.cacert.gigi.util;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.Socket;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.LinkedList;
+import java.util.regex.Pattern;
+
+import org.cacert.gigi.database.DatabaseConnection;
+
+public class EmailChecker {
+       public static final String OK = "OK";
+       public static final String FAIL = "FAIL";
+       private static final Pattern MAIL = Pattern
+                       .compile("^([a-zA-Z0-9])+([a-zA-Z0-9\\+\\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\\._-]+)+$");
+       private EmailChecker() {
+       }
+       public static String checkEmailServer(int forUid, String address)
+                       throws IOException {
+               if (MAIL.matcher(address).matches()) {
+                       String[] parts = address.split("@", 2);
+                       String domain = parts[1];
+
+                       LinkedList<String> mxhosts = getMxHosts(domain);
+
+                       for (String host : mxhosts) {
+                               try (Socket s = new Socket(host, 25);
+                                               BufferedReader br = new BufferedReader(
+                                                               new InputStreamReader(s.getInputStream()));
+                                               PrintWriter pw = new PrintWriter(s.getOutputStream())) {
+                                       String line;
+                                       while ((line = br.readLine()).startsWith("220-")) {
+                                       }
+
+                                       if (!line.startsWith("220")) {
+                                               continue;
+                                       }
+
+                                       pw.print("HELO www.cacert.org\r\n");
+                                       pw.flush();
+
+                                       while ((line = br.readLine()).startsWith("220")) {
+                                       }
+
+                                       if (!line.startsWith("250")) {
+                                               continue;
+                                       }
+                                       pw.print("MAIL FROM: <returns@cacert.org>\r\n");
+                                       pw.flush();
+
+                                       line = br.readLine();
+
+                                       if (!line.startsWith("250")) {
+                                               continue;
+                                       }
+                                       pw.print("RCPT TO: <" + address + ">\r\n");
+                                       pw.flush();
+
+                                       line = br.readLine();
+                                       pw.print("QUIT\r\n");
+                                       pw.flush();
+
+                                       try {
+                                               PreparedStatement statmt = DatabaseConnection
+                                                               .getInstance()
+                                                               .prepare(
+                                                                               "insert into `pinglog` set `when`=NOW(), `email`=?, `result`=?, `uid`=?");
+                                               statmt.setString(1, address);
+                                               statmt.setString(2, line);
+                                               statmt.setInt(3, forUid);
+                                               statmt.execute();
+                                       } catch (SQLException e) {
+                                               e.printStackTrace();
+                                       }
+
+                                       if (!line.startsWith("250")) {
+                                               return line;
+                                       } else {
+                                               return OK;
+                                       }
+                               }
+
+                       }
+               }
+               try {
+                       PreparedStatement statmt = DatabaseConnection
+                                       .getInstance()
+                                       .prepare(
+                                                       "insert into `pinglog` set `when`=NOW(), `email`=?, `result`=?, `uid`=?");
+                       statmt.setString(1, address);
+                       statmt.setString(2,
+                                       "Failed to make a connection to the mail server");
+                       statmt.setInt(3, forUid);
+                       statmt.execute();
+               } catch (SQLException e) {
+                       e.printStackTrace();
+               }
+               return FAIL;
+       }
+       private static LinkedList<String> getMxHosts(String domain)
+                       throws IOException {
+               LinkedList<String> mxhosts = new LinkedList<String>();
+               Process dig = Runtime.getRuntime().exec(
+                               new String[]{"dig", "+short", "MX", domain});
+               try (BufferedReader br = new BufferedReader(new InputStreamReader(
+                               dig.getInputStream()))) {
+                       String line;
+                       while ((line = br.readLine()) != null) {
+                               String[] mxparts = line.split(" ", 2);
+                               if (mxparts.length != 2) {
+                                       continue;
+                               }
+                               mxhosts.add(mxparts[1].substring(0, mxparts[1].length() - 1));
+                       }
+               }
+               return mxhosts;
+       }
+
+}