Created a utility class for email related stuff. Currently supports

(primitive) delivery and address syntax checking.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@122 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/net/MailUtil.java

@@ -0,0 +1,71 @@
+//
+// $Id: MailUtil.java,v 1.1 2001/05/26 07:08:00 mdb Exp $
+
+package com.samskivert.net;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+
+import org.apache.regexp.*;
+import com.samskivert.Log;
+
+/**
+ * The mail util class encapsulates some utility functions related to
+ * sending emails. The mail delivery mechanism depends on being able to
+ * invoke <code>sendmail</code> which probably prevents it from working on
+ * anything other than Unix, but maybe some day someone will care enough
+ * to make the code do whatever one does on Windows to deliver mail. I
+ * don't have the foggiest what that is, so I can't do that currently.
+ */
+public class MailUtil
+{
+    /**
+     * Delivers the supplied mail message. The message should already
+     * contain the mail headers and sendmail will figure everything out
+     * from those. At a minimum, these headers should be included:
+     *
+     * <pre>
+     * From: (sender)
+     * To: (recipient)
+     * Subject: (subject)
+     * </pre>
+     */
+    public void deliverMail (String message)
+        throws IOException
+    {
+        Process p = Runtime.getRuntime().exec("sendmail -t");
+        PrintWriter writer = new PrintWriter(p.getOutputStream());
+        writer.print(message);
+        writer.flush();
+        writer.close();
+
+        // some day we should read the response from the mailer to check
+        // for errors and also check the Process object for a valid return
+        // code. for now we're flying blind!
+    }
+
+    /**
+     * Checks the supplied address against a regular expression that (for
+     * the most part) matches only valid email addresses. It's not
+     * perfect, but the ommissions and inclusions are so obscure that we
+     * can't be bothered to worry about them.
+     */
+    public static boolean isValidAddress (String address)
+    {
+        return _emailre.match(address);
+    }
+
+    /** Originally formulated by lambert@nas.nasa.gov. */
+    protected static final String EMAIL_REGEX = "^([-A-Za-z0-9_.!%+]+@" +
+        "[-a-zA-Z0-9]+(\\.[-a-zA-Z0-9]+)*\\.[-a-zA-Z0-9]+)$";
+
+    /** Used to check email addresses for validity. */
+    protected static RE _emailre;
+    static {
+	try {
+	    _emailre = new RE(EMAIL_REGEX);
+	} catch (RESyntaxException rese) {
+	    Log.warning("Unable to initialize email regexp?! " + rese);
+	}
+    }
+}