From: Felix Dörre <felix@dogcraft.de>
Date: Mon, 23 Jun 2014 20:46:50 +0000 (+0200)
Subject: Add the "fast email check"
X-Git-Url: https://code.wpia.club/?p=gigi.git;a=commitdiff_plain;h=4819c620856c8feff2dbda6fbe229b778c440a5e;ds=sidebyside

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 b13b374f..4c44c37f 100644
--- 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
index 00000000..00c6738c
--- /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;
+	}
+
+}