#!/usr/bin/env python # # Copyright 2007 Google Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # """Stub version of the mail API, writes email to logs and can optionally send real email via SMTP or sendmail.""" from email import encoders from email import MIMEBase from email import MIMEMultipart from email import MIMEText import logging import mail import mimetypes import re import subprocess import smtplib from google.appengine.api import apiproxy_stub MAX_REQUEST_SIZE = 32 << 20 class MailServiceStub(apiproxy_stub.APIProxyStub): """Python only mail service stub. Args: host: Host of SMTP server to use. Blank disables sending SMTP. port: Port of SMTP server to use. user: User to log in to SMTP server as. password: Password for SMTP server user. """ THREADSAFE = True def __init__(self, host=None, port=25, user='', password='', enable_sendmail=False, show_mail_body=False, service_name='mail', allow_tls=True): """Constructor. Args: host: Host of SMTP mail server. port: Port of SMTP mail server. user: Sending user of SMTP mail. password: SMTP password. enable_sendmail: Whether sendmail enabled or not. show_mail_body: Whether to show mail body in log. service_name: Service name expected for all calls. allow_tls: Allow TLS support. If True, use TLS provided the server announces support in the EHLO response. If False, do not use TLS. """ super(MailServiceStub, self).__init__(service_name, max_request_size=MAX_REQUEST_SIZE) self._smtp_host = host self._smtp_port = port self._smtp_user = user self._smtp_password = password self._enable_sendmail = enable_sendmail self._show_mail_body = show_mail_body self._allow_tls = allow_tls self._cached_messages = [] def _GenerateLog(self, method, message, log): """Generate a list of log messages representing sent mail. Args: message: Message to write to log. log: Log function of type string -> None """ log_message = [] log_message.append('MailService.%s' % method) log_message.append(' From: %s' % message.sender()) for address in message.to_list(): log_message.append(' To: %s' % address) for address in message.cc_list(): log_message.append(' Cc: %s' % address) for address in message.bcc_list(): log_message.append(' Bcc: %s' % address) if message.replyto(): log_message.append(' Reply-to: %s' % message.replyto()) log_message.append(' Subject: %s' % message.subject()) if message.has_textbody(): log_message.append(' Body:') log_message.append(' Content-type: text/plain') log_message.append(' Data length: %d' % len(message.textbody())) if self._show_mail_body: log_message.append('-----\n' + message.textbody() + '\n-----') if message.has_htmlbody(): log_message.append(' Body:') log_message.append(' Content-type: text/html') log_message.append(' Data length: %d' % len(message.htmlbody())) if self._show_mail_body: log_message.append('-----\n' + message.htmlbody() + '\n-----') for attachment in message.attachment_list(): log_message.append(' Attachment:') log_message.append(' File name: %s' % attachment.filename()) log_message.append(' Data length: %s' % len(attachment.data())) log('\n'.join(log_message)) @apiproxy_stub.Synchronized def _CacheMessage(self, message): """Cache a message that were sent for later inspection. Args: message: Message to cache. """ self._cached_messages.append(message) @apiproxy_stub.Synchronized def get_sent_messages(self, to=None, sender=None, subject=None, body=None, html=None): """Get a list of mail messages sent via the Mail API. Args: to: A regular expression that at least one recipient must match. sender: A regular expression that the sender must match. subject: A regular expression that the message subject must match. body: A regular expression that the text body must match. html: A regular expression that the HTML body must match. Returns: A list of matching mail.EmailMessage objects. """ messages = self._cached_messages def recipient_matches(recipient): return re.search(to, recipient) if to: messages = [m for m in messages if filter(recipient_matches, m.to_list())] if sender: messages = [m for m in messages if re.search(sender, m.sender())] if subject: messages = [m for m in messages if re.search(subject, m.subject())] if body: messages = [m for m in messages if re.search(body, m.textbody())] if html: messages = [m for m in messages if re.search(html, m.htmlbody())] mail_messages = [] for message in messages: mime_message = mail.mail_message_to_mime_message(message) email_message = mail.EmailMessage(mime_message=mime_message) mail_messages.append(email_message) return mail_messages def _SendSMTP(self, mime_message, smtp_lib=smtplib.SMTP): """Send MIME message via SMTP. Connects to SMTP server and sends MIME message. If user is supplied will try to login to that server to send as authenticated. Does not currently support encryption. Args: mime_message: MimeMessage to send. Create using ToMIMEMessage. smtp_lib: Class of SMTP library. Used for dependency injection. """ smtp = smtp_lib() try: smtp.connect(self._smtp_host, self._smtp_port) smtp.ehlo_or_helo_if_needed() if self._allow_tls and smtp.has_extn('STARTTLS'): smtp.starttls() smtp.ehlo() if self._smtp_user: smtp.login(self._smtp_user, self._smtp_password) tos = [mime_message[to] for to in ['To', 'Cc', 'Bcc'] if mime_message[to]] smtp.sendmail(mime_message['From'], tos, mime_message.as_string()) finally: smtp.quit() def _SendSendmail(self, mime_message, popen=subprocess.Popen, sendmail_command='sendmail'): """Send MIME message via sendmail, if exists on computer. Attempts to send email via sendmail. Any IO failure, including the program not being found is ignored. Args: mime_message: MimeMessage to send. Create using ToMIMEMessage. popen: popen function to create a new sub-process. """ try: tos = [] for to in ('To', 'Cc', 'Bcc'): if mime_message[to]: tos.extend("'%s'" % addr.strip().replace("'", r"'\''") for addr in unicode(mime_message[to]).split(',')) command = '%s %s' % (sendmail_command, ' '.join(tos)) try: child = popen(command, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE) except (IOError, OSError), e: logging.error('Unable to open pipe to sendmail') raise try: child.stdin.write(mime_message.as_string()) child.stdin.close() finally: while child.poll() is None: child.stdout.read(100) child.stdout.close() except (IOError, OSError), e: logging.error('Error sending mail using sendmail: ' + str(e)) def _Send(self, request, response, log=logging.info, smtp_lib=smtplib.SMTP, popen=subprocess.Popen, sendmail_command='sendmail'): """Implementation of MailServer::Send(). Logs email message. Contents of attachments are not shown, only their sizes. If SMTP is configured, will send via SMTP, else will use Sendmail if it is installed. Args: request: The message to send, a SendMailRequest. response: The send response, a SendMailResponse. log: Log function to send log information. Used for dependency injection. smtp_lib: Class of SMTP library. Used for dependency injection. popen2: popen2 function to use for opening pipe to other process. Used for dependency injection. """ self._CacheMessage(request) self._GenerateLog('Send', request, log) if self._smtp_host and self._enable_sendmail: log('Both SMTP and sendmail are enabled. Ignoring sendmail.') import email mime_message = mail.MailMessageToMIMEMessage(request) _Base64EncodeAttachments(mime_message) if self._smtp_host: self._SendSMTP(mime_message, smtp_lib) elif self._enable_sendmail: self._SendSendmail(mime_message, popen, sendmail_command) else: logging.info('You are not currently sending out real email. ' 'If you have sendmail installed you can use it ' 'by using the server with --enable_sendmail') _Dynamic_Send = _Send def _SendToAdmins(self, request, response, log=logging.info): """Implementation of MailServer::SendToAdmins(). Logs email message. Contents of attachments are not shown, only their sizes. Given the difficulty of determining who the actual sender is, Sendmail and SMTP are disabled for this action. Args: request: The message to send, a SendMailRequest. response: The send response, a SendMailResponse. log: Log function to send log information. Used for dependency injection. """ self._GenerateLog('SendToAdmins', request, log) if self._smtp_host and self._enable_sendmail: log('Both SMTP and sendmail are enabled. Ignoring sendmail.') _Dynamic_SendToAdmins = _SendToAdmins def _Base64EncodeAttachments(mime_message): """Base64 encode all individual attachments that are not text. Args: mime_message: MimeMessage to process. """ for item in mime_message.get_payload(): if (item.get_content_maintype() not in ['multipart', 'text'] and 'Content-Transfer-Encoding' not in item): encoders.encode_base64(item)