mail: initial mail service

This process provides an DBus interface for sending mails
to users. It has MIME support for plain text and html mails
and supports attachments.

The service gets the SMTP server's hostname, port and authentication
data from the configuration daemon.

1 files changed, 160 insertions, 0 deletions

diff --git a/src/mail/mailer.vala b/src/mail/mailer.vala
new file mode 100644
index 0000000..58b1b45
--- /dev/null
+++ b/src/mail/mailer.vala
@@ -0,0 +1,160 @@
+/* Copyright 2013, Sebastian Reichel <sre@ring0.de>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+[DBus (name = "io.mainframe.shopsystem.Mailer")]
+public class MailerImplementation {
+	Smtp.Session session;
+	bool messagecb_done = false;
+	uint mailcounter = 0;
+
+	struct MailEntry {
+		uint registration_id;
+		MailImplementation mail;
+	}
+
+	HashTable<string,MailEntry?> mails;
+	MailImplementation current_mail;
+
+	string server;
+	string username;
+	string password;
+
+	unowned string? callback(out string? buf, int *len) {
+		buf = null;
+
+		if(len != null && !messagecb_done) {
+			buf = current_mail.generate();
+			*len = buf.length;
+			messagecb_done = true;
+		}
+
+		return buf;
+	}
+
+	int auth_interaction(Smtp.AuthClientRequest[] requests, char** result) {
+		for(int i=0; i < requests.length; i++) {
+			if(Smtp.AuthType.USER in requests[i].flags) {
+				*(result+i) = username;
+			} else if(Smtp.AuthType.PASS in requests[i].flags) {
+				*(result+i) = password;
+			}
+		}
+		return 1;
+	}
+
+	public MailerImplementation() throws IOError {
+		int result;
+
+		GMime.init(0);
+
+		Smtp.auth_client_init();
+		session = Smtp.Session();
+		mails = new HashTable<string,MailEntry?>(str_hash, str_equal);
+
+		/* ignore SIGPIPE, as suggested by libESMTP */
+		Posix.signal(Posix.SIGPIPE, Posix.SIG_IGN);
+
+		/* get configuration */
+		Config config = Bus.get_proxy_sync(BusType.SESSION, "io.mainframe.shopsystem.Config", "/io/mainframe/shopsystem/config");
+		try {
+			var cfgserv = config.get_string("MAIL", "server");
+			var cfgport	= config.get_integer("MAIL", "port");
+			server   = @"$cfgserv:$cfgport";
+		} catch(KeyFileError e) {
+			throw new IOError.FAILED("server or port configuration is missing");
+		}
+
+		try {
+			username = config.get_string("MAIL", "username");
+			password = config.get_string("MAIL", "password");
+		} catch(KeyFileError e) {
+			username = "";
+			password = "";
+		}
+
+		/* setup server */
+		result = session.set_server(server);
+		if(result == 0)
+			throw new IOError.FAILED("could not setup server");
+
+		/* Use TLS if possible */
+		result = session.starttls_enable(Smtp.StartTlsOption.ENABLED);
+		if(result == 0)
+			throw new IOError.FAILED("could not setup TLS");
+
+		/* setup authentication */
+		if(username != "") {
+			var auth = Smtp.auth_create_context();
+			auth.set_mechanism_flags(Smtp.AUTH_PLUGIN_PLAIN, 0);
+			auth.set_interact_cb(auth_interaction);
+			session.auth_set_context(auth);
+		}
+	}
+
+	~MailerImplementation() {
+		Smtp.auth_client_exit();
+		GMime.shutdown();
+	}
+
+	public string create_mail() throws IOError {
+		string path = @"/io/mainframe/shopsystem/mail/$mailcounter";
+
+		var mail = new MailImplementation();
+
+		MailEntry entry = {
+			mail_bus.register_object(path, mail),
+			mail
+		};
+
+		mails[path] = entry;
+		mailcounter++;
+
+		return path;
+	}
+
+	public void delete_mail(string path) throws IOError {
+		if(!(path in mails))
+			throw new IOError.NOT_FOUND("No such mail");
+
+		mail_bus.unregister_object(mails[path].registration_id);
+		mails.remove(path);
+	}
+
+	public void send_mail(string path) throws IOError {
+		if(!(path in mails))
+			throw new IOError.NOT_FOUND("No such mail");
+
+		var message = session.add_message();
+
+		messagecb_done = false;
+		current_mail = mails[path].mail;
+		message.set_messagecb(callback);
+
+		foreach(var recipient in current_mail.get_recipients()) {
+			message.add_recipient(recipient);
+		}
+		message.set_reverse_path(current_mail.get_reverse_path());
+
+		int result = session.start_session();
+		if(result == 0)
+			throw new IOError.FAILED("eSMTP: Start Session failed!");
+
+		unowned Smtp.Status status = message.transfer_status();
+		if(status.code < 200 || status.code >= 300)
+			throw new IOError.FAILED("Reply from SMTP-Server: %s", status.text);
+
+		delete_mail(path);
+	}
+}