# Caolan McNamara caolanm@redhat.com
# a simple email mailmerge component

# manual installation for hackers, not necessary for users
# cp mailmerge.py /usr/lib/libreoffice/program
# cd /usr/lib/libreoffice/program
# ./unopkg add --shared mailmerge.py
# edit ~/.openoffice.org2/user/registry/data/org/openoffice/Office/Writer.xcu
# and change EMailSupported to as follows...
#  <prop oor:name="EMailSupported" oor:type="xs:boolean">
#   <value>true</value>
#  </prop>

import unohelper
import uno
import re

# to implement com::sun::star::mail::XMailServiceProvider
# and
# to implement com.sun.star.mail.XMailMessage

from com.sun.star.mail import XMailServiceProvider
from com.sun.star.mail import XMailService
from com.sun.star.mail import XSmtpService
from com.sun.star.mail import XMailMessage
from com.sun.star.mail.MailServiceType import SMTP
from com.sun.star.mail.MailServiceType import POP3
from com.sun.star.mail.MailServiceType import IMAP
from com.sun.star.lang import IllegalArgumentException
from com.sun.star.lang import EventObject
from com.sun.star.lang import XServiceInfo

from email.mime.base import MIMEBase
from email.message import Message
from email.charset import Charset
from email.charset import QP
from email.encoders import encode_base64
from email.header import Header
from email.mime.multipart import MIMEMultipart
from email.utils import formatdate
from email.utils import parseaddr
from socket import _GLOBAL_DEFAULT_TIMEOUT

import os
import sys
import ssl
import smtplib
import imaplib
import poplib

dbg = os.environ.get('LO_DEBUG_MAILMERGE', '').lower() not in ['', '0', 'false']

# pythonloader looks for a static g_ImplementationHelper variable
g_ImplementationHelper = unohelper.ImplementationHelper()
g_providerImplName = "org.openoffice.pyuno.MailServiceProvider"
g_messageImplName = "org.openoffice.pyuno.MailMessage"


def prepareTLSContext(xComponent, xContext, isTLSRequested):
    xConfigProvider = xContext.ServiceManager.createInstance(
        "com.sun.star.configuration.ConfigurationProvider"
    )
    prop = uno.createUnoStruct("com.sun.star.beans.PropertyValue")
    prop.Name = "nodepath"
    prop.Value = "/org.openoffice.Office.Security/Net"
    xSettings = xConfigProvider.createInstanceWithArguments(
        "com.sun.star.configuration.ConfigurationAccess", (prop,)
    )
    isAllowedInsecure = xSettings.getByName("AllowInsecureProtocols")
    tlscontext = None
    if isTLSRequested:
        if dbg:
            print("SSL config: " + str(ssl.get_default_verify_paths()), file=sys.stderr)
        tlscontext = ssl.create_default_context()
        # SSLv2/v3 is already disabled by default.
        # This check does not work, because OpenSSL 3 defines SSL_OP_NO_SSLv2
        # as 0, so even though _ssl__SSLContext_impl() tries to set it,
        # getting the value from SSL_CTX_get_options() doesn't lead to setting
        # the python-level flag.
        # assert (tlscontext.options & ssl.Options.OP_NO_SSLv2) != 0
        assert (tlscontext.options & ssl.Options.OP_NO_SSLv3) != 0
    if not (isAllowedInsecure):
        if not (isTLSRequested):
            if dbg:
                print(
                    "mailmerge.py: insecure connection not allowed by configuration",
                    file=sys.stderr,
                )
            raise IllegalArgumentException(
                "insecure connection not allowed by configuration", xComponent, 1
            )
        tlscontext.options |= ssl.Options.OP_NO_TLSv1 | ssl.Options.OP_NO_TLSv1_1
    return tlscontext


class PyMailSMTPService(unohelper.Base, XSmtpService):
    def __init__(self, ctx):
        self.ctx = ctx
        self.listeners = []
        self.supportedtypes = ("Insecure", "Ssl")
        self.server = None
        self.connectioncontext = None
        self.notify = EventObject(self)
        if dbg:
            print("PyMailSMTPService init", file=sys.stderr)
            print("python version is: " + sys.version, file=sys.stderr)

    def addConnectionListener(self, xListener):
        if dbg:
            print("PyMailSMTPService addConnectionListener", file=sys.stderr)
        self.listeners.append(xListener)

    def removeConnectionListener(self, xListener):
        if dbg:
            print("PyMailSMTPService removeConnectionListener", file=sys.stderr)
        self.listeners.remove(xListener)

    def getSupportedConnectionTypes(self):
        if dbg:
            print("PyMailSMTPService getSupportedConnectionTypes", file=sys.stderr)
        return self.supportedtypes

    def connect(self, xConnectionContext, xAuthenticator):
        self.connectioncontext = xConnectionContext
        if dbg:
            print("PyMailSMTPService connect", file=sys.stderr)
        server = xConnectionContext.getValueByName("ServerName").strip()
        if dbg:
            print("ServerName: " + server, file=sys.stderr)
        port = int(xConnectionContext.getValueByName("Port"))
        if dbg:
            print("Port: " + str(port), file=sys.stderr)
        tout = xConnectionContext.getValueByName("Timeout")
        if dbg:
            print(isinstance(tout, int), file=sys.stderr)
        if not isinstance(tout, int):
            tout = _GLOBAL_DEFAULT_TIMEOUT
        if dbg:
            print("Timeout: " + str(tout), file=sys.stderr)
        connectiontype = xConnectionContext.getValueByName("ConnectionType")
        if dbg:
            print("ConnectionType: " + connectiontype, file=sys.stderr)
        tlscontext = prepareTLSContext(
            self, self.ctx, connectiontype.upper() == "SSL" or port == 465
        )
        if port == 465:
            self.server = smtplib.SMTP_SSL(
                server, port, timeout=tout, context=tlscontext
            )
        else:
            self.server = smtplib.SMTP(server, port, timeout=tout)

        if dbg:
            self.server.set_debuglevel(1)

        if connectiontype.upper() == "SSL" and port != 465:
            # STRIPTLS: smtplib raises an exception if result is not 220
            self.server.starttls(context=tlscontext)

        user = xAuthenticator.getUserName()
        password = xAuthenticator.getPassword()
        if user != "":
            if dbg:
                print("Logging in, username of: " + user, file=sys.stderr)
            self.server.login(user, password)

        for listener in self.listeners:
            listener.connected(self.notify)

    def disconnect(self):
        if dbg:
            print("PyMailSMTPService disconnect", file=sys.stderr)
        if self.server:
            self.server.quit()
            self.server = None
        for listener in self.listeners:
            listener.disconnected(self.notify)

    def isConnected(self):
        if dbg:
            print("PyMailSMTPService isConnected", file=sys.stderr)
        return self.server is not None

    def getCurrentConnectionContext(self):
        if dbg:
            print("PyMailSMTPService getCurrentConnectionContext", file=sys.stderr)
        return self.connectioncontext

    def sendMailMessage(self, xMailMessage):
        COMMASPACE = ", "

        if dbg:
            print("PyMailSMTPService sendMailMessage", file=sys.stderr)
        recipients = xMailMessage.getRecipients()
        sendermail = xMailMessage.SenderAddress
        sendername = xMailMessage.SenderName
        subject = xMailMessage.Subject
        ccrecipients = xMailMessage.getCcRecipients()
        bccrecipients = xMailMessage.getBccRecipients()
        if dbg:
            print("PyMailSMTPService subject: " + subject, file=sys.stderr)
            print("PyMailSMTPService from:  " + sendername, file=sys.stderr)
            print("PyMailSMTPService from:  " + sendermail, file=sys.stderr)
            print("PyMailSMTPService send to: %s" % (recipients,), file=sys.stderr)

        attachments = xMailMessage.getAttachments()

        textmsg = Message()

        content = xMailMessage.Body
        flavors = content.getTransferDataFlavors()
        if dbg:
            print(
                "PyMailSMTPService flavors len: %d" % (len(flavors),), file=sys.stderr
            )

        # Use first flavor that's sane for an email body
        for flavor in flavors:
            if (
                flavor.MimeType.find("text/html") != -1
                or flavor.MimeType.find("text/plain") != -1
            ):
                if dbg:
                    print(
                        "PyMailSMTPService mimetype is: " + flavor.MimeType,
                        file=sys.stderr,
                    )
                textbody = content.getTransferData(flavor)

                if len(textbody):
                    mimeEncoding = re.sub(
                        "charset=.*", "charset=UTF-8", flavor.MimeType
                    )
                    if mimeEncoding.find("charset=UTF-8") == -1:
                        mimeEncoding = mimeEncoding + "; charset=UTF-8"
                    textmsg["Content-Type"] = mimeEncoding
                    textmsg["MIME-Version"] = "1.0"

                    try:
                        # it's a string, get it as utf-8 bytes
                        textbody = textbody.encode("utf-8")
                    except Exception:
                        # it's a bytesequence, get raw bytes
                        textbody = textbody.value
                    textbody = textbody.decode("utf-8")
                    c = Charset("utf-8")
                    c.body_encoding = QP
                    textmsg.set_payload(textbody, c)

                break

        if len(attachments):
            msg = MIMEMultipart()
            msg.epilogue = ""
            msg.attach(textmsg)
        else:
            msg = textmsg

        hdr = Header(sendername, "utf-8")
        hdr.append("<" + sendermail + ">", "us-ascii")
        msg["Subject"] = subject
        msg["From"] = hdr
        msg["To"] = COMMASPACE.join(recipients)
        if len(ccrecipients):
            msg["Cc"] = COMMASPACE.join(ccrecipients)
        if xMailMessage.ReplyToAddress != "":
            msg["Reply-To"] = xMailMessage.ReplyToAddress

        mailerstring = "LibreOffice via Caolan's mailmerge component"
        try:
            ctx = uno.getComponentContext()
            aConfigProvider = ctx.ServiceManager.createInstance(
                "com.sun.star.configuration.ConfigurationProvider"
            )
            prop = uno.createUnoStruct("com.sun.star.beans.PropertyValue")
            prop.Name = "nodepath"
            prop.Value = "/org.openoffice.Setup/Product"
            aSettings = aConfigProvider.createInstanceWithArguments(
                "com.sun.star.configuration.ConfigurationAccess", (prop,)
            )
            mailerstring = (
                aSettings.getByName("ooName")
                + " "
                + aSettings.getByName("ooSetupVersion")
                + " via Caolan's mailmerge component"
            )
        except Exception:
            pass

        msg["X-Mailer"] = mailerstring
        msg["Date"] = formatdate(localtime=True)

        for attachment in attachments:
            content = attachment.Data
            flavors = content.getTransferDataFlavors()
            flavor = flavors[0]
            ctype = flavor.MimeType
            maintype, subtype = ctype.split("/", 1)
            msgattachment = MIMEBase(maintype, subtype)
            data = content.getTransferData(flavor)
            msgattachment.set_payload(data.value)
            encode_base64(msgattachment)
            fname = attachment.ReadableName
            try:
                msgattachment.add_header(
                    "Content-Disposition", "attachment", filename=fname
                )
            except Exception:
                msgattachment.add_header(
                    "Content-Disposition", "attachment", filename=("utf-8", "", fname)
                )
            if dbg:
                print(
                    ("PyMailSMTPService attachmentheader: ", str(msgattachment)),
                    file=sys.stderr,
                )

            msg.attach(msgattachment)

        uniquer = {}
        for key in recipients:
            uniquer[key] = True
        if len(ccrecipients):
            for key in ccrecipients:
                uniquer[key] = True
        if len(bccrecipients):
            for key in bccrecipients:
                uniquer[key] = True
        truerecipients = uniquer.keys()

        if dbg:
            print(
                ("PyMailSMTPService recipients are: ", truerecipients), file=sys.stderr
            )

        self.server.sendmail(sendermail, truerecipients, msg.as_string())


class PyMailIMAPService(unohelper.Base, XMailService):
    def __init__(self, ctx):
        self.ctx = ctx
        self.listeners = []
        self.supportedtypes = ("Insecure", "Ssl")
        self.server = None
        self.connectioncontext = None
        self.notify = EventObject(self)
        if dbg:
            print("PyMailIMAPService init", file=sys.stderr)

    def addConnectionListener(self, xListener):
        if dbg:
            print("PyMailIMAPService addConnectionListener", file=sys.stderr)
        self.listeners.append(xListener)

    def removeConnectionListener(self, xListener):
        if dbg:
            print("PyMailIMAPService removeConnectionListener", file=sys.stderr)
        self.listeners.remove(xListener)

    def getSupportedConnectionTypes(self):
        if dbg:
            print("PyMailIMAPService getSupportedConnectionTypes", file=sys.stderr)
        return self.supportedtypes

    def connect(self, xConnectionContext, xAuthenticator):
        if dbg:
            print("PyMailIMAPService connect", file=sys.stderr)

        self.connectioncontext = xConnectionContext
        server = xConnectionContext.getValueByName("ServerName")
        if dbg:
            print(server, file=sys.stderr)
        port = int(xConnectionContext.getValueByName("Port"))
        if dbg:
            print(port, file=sys.stderr)
        connectiontype = xConnectionContext.getValueByName("ConnectionType")
        if dbg:
            print(connectiontype, file=sys.stderr)
        tlscontext = prepareTLSContext(self, self.ctx, connectiontype.upper() == "SSL")
        print("BEFORE", file=sys.stderr)
        if connectiontype.upper() == "SSL":
            self.server = imaplib.IMAP4_SSL(server, port, ssl_context=tlscontext)
        else:
            self.server = imaplib.IMAP4(server, port)
        print("AFTER", file=sys.stderr)

        user = xAuthenticator.getUserName()
        password = xAuthenticator.getPassword()
        if user != "":
            if dbg:
                print("Logging in, username of: " + user, file=sys.stderr)
            self.server.login(user, password)

        for listener in self.listeners:
            listener.connected(self.notify)

    def disconnect(self):
        if dbg:
            print("PyMailIMAPService disconnect", file=sys.stderr)
        if self.server:
            self.server.logout()
            self.server = None
        for listener in self.listeners:
            listener.disconnected(self.notify)

    def isConnected(self):
        if dbg:
            print("PyMailIMAPService isConnected", file=sys.stderr)
        return self.server is not None

    def getCurrentConnectionContext(self):
        if dbg:
            print("PyMailIMAPService getCurrentConnectionContext", file=sys.stderr)
        return self.connectioncontext


class PyMailPOP3Service(unohelper.Base, XMailService):
    def __init__(self, ctx):
        self.ctx = ctx
        self.listeners = []
        self.supportedtypes = ("Insecure", "Ssl")
        self.server = None
        self.connectioncontext = None
        self.notify = EventObject(self)
        if dbg:
            print("PyMailPOP3Service init", file=sys.stderr)

    def addConnectionListener(self, xListener):
        if dbg:
            print("PyMailPOP3Service addConnectionListener", file=sys.stderr)
        self.listeners.append(xListener)

    def removeConnectionListener(self, xListener):
        if dbg:
            print("PyMailPOP3Service removeConnectionListener", file=sys.stderr)
        self.listeners.remove(xListener)

    def getSupportedConnectionTypes(self):
        if dbg:
            print("PyMailPOP3Service getSupportedConnectionTypes", file=sys.stderr)
        return self.supportedtypes

    def connect(self, xConnectionContext, xAuthenticator):
        if dbg:
            print("PyMailPOP3Service connect", file=sys.stderr)

        self.connectioncontext = xConnectionContext
        server = xConnectionContext.getValueByName("ServerName")
        if dbg:
            print(server, file=sys.stderr)
        port = int(xConnectionContext.getValueByName("Port"))
        if dbg:
            print(port, file=sys.stderr)
        connectiontype = xConnectionContext.getValueByName("ConnectionType")
        if dbg:
            print(connectiontype, file=sys.stderr)
        tlscontext = prepareTLSContext(self, self.ctx, connectiontype.upper() == "SSL")
        print("BEFORE", file=sys.stderr)
        if connectiontype.upper() == "SSL":
            self.server = poplib.POP3_SSL(server, port, context=tlscontext)
        else:
            tout = xConnectionContext.getValueByName("Timeout")
            if dbg:
                print(isinstance(tout, int), file=sys.stderr)
            if not isinstance(tout, int):
                tout = _GLOBAL_DEFAULT_TIMEOUT
            if dbg:
                print("Timeout: " + str(tout), file=sys.stderr)
            self.server = poplib.POP3(server, port, timeout=tout)
        print("AFTER", file=sys.stderr)

        user = xAuthenticator.getUserName()
        password = xAuthenticator.getPassword()
        if dbg:
            print("Logging in, username of: " + user, file=sys.stderr)
        self.server.user(user)
        self.server.pass_(password)

        for listener in self.listeners:
            listener.connected(self.notify)

    def disconnect(self):
        if dbg:
            print("PyMailPOP3Service disconnect", file=sys.stderr)
        if self.server:
            self.server.quit()
            self.server = None
        for listener in self.listeners:
            listener.disconnected(self.notify)

    def isConnected(self):
        if dbg:
            print("PyMailPOP3Service isConnected", file=sys.stderr)
        return self.server is not None

    def getCurrentConnectionContext(self):
        if dbg:
            print("PyMailPOP3Service getCurrentConnectionContext", file=sys.stderr)
        return self.connectioncontext


class PyMailServiceProvider(unohelper.Base, XMailServiceProvider, XServiceInfo):
    def __init__(self, ctx):
        if dbg:
            print("PyMailServiceProvider init", file=sys.stderr)
        self.ctx = ctx

    def create(self, aType):
        if dbg:
            print("PyMailServiceProvider create with", aType, file=sys.stderr)
        if aType == SMTP:
            return PyMailSMTPService(self.ctx)
        elif aType == POP3:
            return PyMailPOP3Service(self.ctx)
        elif aType == IMAP:
            return PyMailIMAPService(self.ctx)
        else:
            print("PyMailServiceProvider, unknown TYPE " + aType, file=sys.stderr)

    def getImplementationName(self):
        return g_providerImplName

    def supportsService(self, ServiceName):
        return g_ImplementationHelper.supportsService(g_providerImplName, ServiceName)

    def getSupportedServiceNames(self):
        return g_ImplementationHelper.getSupportedServiceNames(g_providerImplName)


class PyMailMessage(unohelper.Base, XMailMessage):
    def __init__(
        self, ctx, sTo="", sFrom="", Subject="", Body=None, aMailAttachment=None
    ):
        if dbg:
            print("PyMailMessage init", file=sys.stderr)
        self.ctx = ctx

        self.recipients = [sTo]
        self.ccrecipients = []
        self.bccrecipients = []
        self.aMailAttachments = []
        if aMailAttachment is not None:
            self.aMailAttachments.append(aMailAttachment)

        self.SenderName, self.SenderAddress = parseaddr(sFrom)
        self.ReplyToAddress = sFrom
        self.Subject = Subject
        self.Body = Body
        if dbg:
            print("post PyMailMessage init", file=sys.stderr)

    def addRecipient(self, recipient):
        if dbg:
            print("PyMailMessage.addRecipient: " + recipient, file=sys.stderr)
        self.recipients.append(recipient)

    def addCcRecipient(self, ccrecipient):
        if dbg:
            print("PyMailMessage.addCcRecipient: " + ccrecipient, file=sys.stderr)
        self.ccrecipients.append(ccrecipient)

    def addBccRecipient(self, bccrecipient):
        if dbg:
            print("PyMailMessage.addBccRecipient: " + bccrecipient, file=sys.stderr)
        self.bccrecipients.append(bccrecipient)

    def getRecipients(self):
        if dbg:
            print(
                "PyMailMessage.getRecipients: " + str(self.recipients), file=sys.stderr
            )
        return tuple(self.recipients)

    def getCcRecipients(self):
        if dbg:
            print(
                "PyMailMessage.getCcRecipients: " + str(self.ccrecipients),
                file=sys.stderr,
            )
        return tuple(self.ccrecipients)

    def getBccRecipients(self):
        if dbg:
            print(
                "PyMailMessage.getBccRecipients: " + str(self.bccrecipients),
                file=sys.stderr,
            )
        return tuple(self.bccrecipients)

    def addAttachment(self, aMailAttachment):
        if dbg:
            print("PyMailMessage.addAttachment", file=sys.stderr)
        self.aMailAttachments.append(aMailAttachment)

    def getAttachments(self):
        if dbg:
            print("PyMailMessage.getAttachments", file=sys.stderr)
        return tuple(self.aMailAttachments)

    def getImplementationName(self):
        return g_messageImplName

    def supportsService(self, ServiceName):
        return g_ImplementationHelper.supportsService(g_messageImplName, ServiceName)

    def getSupportedServiceNames(self):
        return g_ImplementationHelper.getSupportedServiceNames(g_messageImplName)


g_ImplementationHelper.addImplementation(
    PyMailServiceProvider,
    g_providerImplName,
    ("com.sun.star.mail.MailServiceProvider",),
)
g_ImplementationHelper.addImplementation(
    PyMailMessage,
    g_messageImplName,
    ("com.sun.star.mail.MailMessage",),
)

# vim: set shiftwidth=4 softtabstop=4 expandtab: