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import smtplib
from . import interface


def hook_extract_listname(context):
    lines = context['content'].split(b'\n')
    for line in lines:
        if line.startswith(b'To: '):
            listname = line.split()[1].decode('ascii')
            context['listname'] = listname.split('@')[0]
            context['listaddress'] = listname
            print('found listname: {}'.format(listname))
            return
    raise interface.HookAbortError('listname not found')


def hook_check_ml_restrictions(context):
    pass


def hook_validate_poster(context):
    pass


def hook_process_subscribe_queries(context):
    pass


def hook_modify_reply_to(context):
    content = context['content']
    listaddress = context['listaddress'].encode('ascii')
    try:
        index = content.index(b'\r\n\r\n')
        context['content'] = b''.join([
                content[0:index],
                b'\r\nReply-To: ', listaddress, # same header line
                content[index:]])
    except ValueError as e:
        raise interface.HookAbortError('bad email, missing header separator') \
              from e


def hook_generate_rcpt_list(context):
    listname = context.get('listname', None)
    if not listname:
        raise interface.HookStopIteration('list name not found')
    recipients_filename = ''.join([listname, '-recipients.txt'])
    try:
        with open(recipients_filename, encoding='utf8') as fi:
            recipients = [recipient for recipient in fi]
            context['recipients'] = recipients
    except FileNotFoundError as e:
        n = interface.HookAbortError('recipients list not found')
        n.args += ({'listname': listname,
                       'recipients_filename': recipients_filename}, )
        raise n from e


def hook_send_all(context):
    listaddress = context.get('listaddress', None)
    if not listaddress:
        raise interface.HookStopIteration('list address not found')
    recipients = context.get('recipients', None)
    if not recipients:
        raise interface.HookStopIteration()
    # TODO: how to send emails here ?

    print('server_smtp:', context['conf']['smtp.server'])
    with smtplib.SMTP('devys.org') as smtp_server:
        #smtp_server.set_debuglevel(1)
        smtp_server.sendmail(listaddress,
                            context['recipients'],
                            context['content'],
                            mail_options=['SMTPUTF8'])