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aprsd
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aprsd/aprsd/email.py

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Python
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import datetime
import email
from email.mime.text import MIMEText
import imaplib
import logging
import re
import smtplib
import time
import imapclient
from validate_email import validate_email
from aprsd import messaging, stats, threads, trace
LOG = logging.getLogger("APRSD")
# This gets forced set from main.py prior to being used internally
CONFIG = None
@trace.trace
def _imap_connect():
imap_port = CONFIG["aprsd"]["email"]["imap"].get("port", 143)
use_ssl = CONFIG["aprsd"]["email"]["imap"].get("use_ssl", False)
host = CONFIG["aprsd"]["email"]["imap"]["host"]
msg = "{}{}:{}".format("TLS " if use_ssl else "", host, imap_port)
# LOG.debug("Connect to IMAP host {} with user '{}'".
# format(msg, CONFIG['imap']['login']))
try:
server = imapclient.IMAPClient(
CONFIG["aprsd"]["email"]["imap"]["host"],
port=imap_port,
use_uid=True,
ssl=use_ssl,
timeout=30,
)
except Exception as e:
LOG.error("Failed to connect IMAP server", e)
return
try:
server.login(
CONFIG["aprsd"]["email"]["imap"]["login"],
CONFIG["aprsd"]["email"]["imap"]["password"],
)
except (imaplib.IMAP4.error, Exception) as e:
msg = getattr(e, "message", repr(e))
LOG.error(f"Failed to login {msg}")
return
server.select_folder("INBOX")
server.fetch = trace.trace(server.fetch)
server.search = trace.trace(server.search)
server.remove_flags = trace.trace(server.remove_flags)
server.add_flags = trace.trace(server.add_flags)
return server
@trace.trace
def _smtp_connect():
host = CONFIG["aprsd"]["email"]["smtp"]["host"]
smtp_port = CONFIG["aprsd"]["email"]["smtp"]["port"]
use_ssl = CONFIG["aprsd"]["email"]["smtp"].get("use_ssl", False)
msg = "{}{}:{}".format("SSL " if use_ssl else "", host, smtp_port)
LOG.debug(
"Connect to SMTP host {} with user '{}'".format(
msg,
CONFIG["aprsd"]["email"]["imap"]["login"],
),
)
try:
if use_ssl:
server = smtplib.SMTP_SSL(
host=host,
port=smtp_port,
timeout=30,
)
else:
server = smtplib.SMTP(
host=host,
port=smtp_port,
timeout=30,
)
except Exception:
LOG.error("Couldn't connect to SMTP Server")
return
LOG.debug(f"Connected to smtp host {msg}")
debug = CONFIG["aprsd"]["email"]["smtp"].get("debug", False)
if debug:
server.set_debuglevel(5)
server.sendmail = trace.trace(server.sendmail)
try:
server.login(
CONFIG["aprsd"]["email"]["smtp"]["login"],
CONFIG["aprsd"]["email"]["smtp"]["password"],
)
except Exception:
LOG.error("Couldn't connect to SMTP Server")
return
LOG.debug(f"Logged into SMTP server {msg}")
return server
def validate_shortcuts(config):
shortcuts = config["aprsd"]["email"].get("shortcuts", None)
if not shortcuts:
return
LOG.info(
"Validating {} Email shortcuts. This can take up to 10 seconds"
" per shortcut".format(len(shortcuts)),
)
delete_keys = []
for key in shortcuts:
LOG.info(f"Validating {key}:{shortcuts[key]}")
is_valid = validate_email(
email_address=shortcuts[key],
check_regex=True,
check_mx=False,
from_address=config["aprsd"]["email"]["smtp"]["login"],
helo_host=config["aprsd"]["email"]["smtp"]["host"],
smtp_timeout=10,
dns_timeout=10,
use_blacklist=True,
debug=False,
)
if not is_valid:
LOG.error(
"'{}' is an invalid email address. Removing shortcut".format(
shortcuts[key],
),
)
delete_keys.append(key)
for key in delete_keys:
del config["aprsd"]["email"]["shortcuts"][key]
LOG.info("Available shortcuts: {}".format(config["aprsd"]["email"]["shortcuts"]))
def get_email_from_shortcut(addr):
if CONFIG["aprsd"]["email"].get("shortcuts", False):
return CONFIG["aprsd"]["email"]["shortcuts"].get(addr, addr)
else:
return addr
def validate_email_config(config, disable_validation=False):
"""function to simply ensure we can connect to email services.
This helps with failing early during startup.
"""
LOG.info("Checking IMAP configuration")
imap_server = _imap_connect()
LOG.info("Checking SMTP configuration")
smtp_server = _smtp_connect()
# Now validate and flag any shortcuts as invalid
if not disable_validation:
validate_shortcuts(config)
else:
LOG.info("Shortcuts email validation is Disabled!!, you were warned.")
if imap_server and smtp_server:
return True
else:
return False
@trace.trace
def parse_email(msgid, data, server):
envelope = data[b"ENVELOPE"]
# email address match
# use raw string to avoid invalid escape secquence errors r"string here"
f = re.search(r"([\.\w_-]+@[\.\w_-]+)", str(envelope.from_[0]))
if f is not None:
from_addr = f.group(1)
else:
from_addr = "noaddr"
LOG.debug(f"Got a message from '{from_addr}'")
try:
m = server.fetch([msgid], ["RFC822"])
except Exception as e:
LOG.exception("Couldn't fetch email from server in parse_email", e)
return
msg = email.message_from_string(m[msgid][b"RFC822"].decode(errors="ignore"))
if msg.is_multipart():
text = ""
html = None
# default in case body somehow isn't set below - happened once
body = b"* unreadable msg received"
# this uses the last text or html part in the email, phone companies often put content in an attachment
for part in msg.get_payload():
if part.get_content_charset() is None:
# or BREAK when we hit a text or html?
# We cannot know the character set,
# so return decoded "something"
LOG.debug("Email got unknown content type")
text = part.get_payload(decode=True)
continue
charset = part.get_content_charset()
if part.get_content_type() == "text/plain":
LOG.debug("Email got text/plain")
text = str(
part.get_payload(decode=True),
str(charset),
"ignore",
).encode("utf8", "replace")
if part.get_content_type() == "text/html":
LOG.debug("Email got text/html")
html = str(
part.get_payload(decode=True),
str(charset),
"ignore",
).encode("utf8", "replace")
if text is not None:
# strip removes white space fore and aft of string
body = text.strip()
else:
body = html.strip()
else: # message is not multipart
# email.uscc.net sends no charset, blows up unicode function below
LOG.debug("Email is not multipart")
if msg.get_content_charset() is None:
text = str(msg.get_payload(decode=True), "US-ASCII", "ignore").encode(
"utf8",
"replace",
)
else:
text = str(
msg.get_payload(decode=True),
msg.get_content_charset(),
"ignore",
).encode("utf8", "replace")
body = text.strip()
# FIXED: UnicodeDecodeError: 'ascii' codec can't decode byte 0xf0 in position 6: ordinal not in range(128)
# decode with errors='ignore'. be sure to encode it before we return it below, also with errors='ignore'
try:
body = body.decode(errors="ignore")
except Exception as e:
LOG.error("Unicode decode failure: " + str(e))
LOG.error("Unidoce decode failed: " + str(body))
body = "Unreadable unicode msg"
# strip all html tags
body = re.sub("<[^<]+?>", "", body)
# strip CR/LF, make it one line, .rstrip fails at this
body = body.replace("\n", " ").replace("\r", " ")
# ascii might be out of range, so encode it, removing any error characters
body = body.encode(errors="ignore")
return (body, from_addr)
# end parse_email
@trace.trace
def send_email(to_addr, content):
global check_email_delay
shortcuts = CONFIG["aprsd"]["email"]["shortcuts"]
email_address = get_email_from_shortcut(to_addr)
LOG.info("Sending Email_________________")
if to_addr in shortcuts:
LOG.info("To : " + to_addr)
to_addr = email_address
LOG.info(" (" + to_addr + ")")
subject = CONFIG["ham"]["callsign"]
# content = content + "\n\n(NOTE: reply with one line)"
LOG.info("Subject : " + subject)
LOG.info("Body : " + content)
# check email more often since there's activity right now
check_email_delay = 60
msg = MIMEText(content)
msg["Subject"] = subject
msg["From"] = CONFIG["aprsd"]["email"]["smtp"]["login"]
msg["To"] = to_addr
server = _smtp_connect()
if server:
try:
server.sendmail(
CONFIG["aprsd"]["email"]["smtp"]["login"],
[to_addr],
msg.as_string(),
)
stats.APRSDStats().email_tx_inc()
except Exception as e:
msg = getattr(e, "message", repr(e))
LOG.error("Sendmail Error!!!! '{}'", msg)
server.quit()
return -1
server.quit()
return 0
# end send_email
@trace.trace
def resend_email(count, fromcall):
global check_email_delay
date = datetime.datetime.now()
month = date.strftime("%B")[:3] # Nov, Mar, Apr
day = date.day
year = date.year
today = f"{day}-{month}-{year}"
shortcuts = CONFIG["aprsd"]["email"]["shortcuts"]
# swap key/value
shortcuts_inverted = {v: k for k, v in shortcuts.items()}
try:
server = _imap_connect()
except Exception as e:
LOG.exception("Failed to Connect to IMAP. Cannot resend email ", e)
return
try:
messages = server.search(["SINCE", today])
except Exception as e:
LOG.exception("Couldn't search for emails in resend_email ", e)
return
# LOG.debug("%d messages received today" % len(messages))
msgexists = False
messages.sort(reverse=True)
del messages[int(count) :] # only the latest "count" messages
for message in messages:
try:
parts = server.fetch(message, ["ENVELOPE"]).items()
except Exception as e:
LOG.exception("Couldn't fetch email parts in resend_email", e)
continue
for msgid, data in list(parts):
# one at a time, otherwise order is random
(body, from_addr) = parse_email(msgid, data, server)
# unset seen flag, will stay bold in email client
try:
server.remove_flags(msgid, [imapclient.SEEN])
except Exception as e:
LOG.exception("Failed to remove SEEN flag in resend_email", e)
if from_addr in shortcuts_inverted:
# reverse lookup of a shortcut
from_addr = shortcuts_inverted[from_addr]
# asterisk indicates a resend
reply = "-" + from_addr + " * " + body.decode(errors="ignore")
# messaging.send_message(fromcall, reply)
msg = messaging.TextMessage(
CONFIG["aprs"]["login"],
fromcall,
reply,
)
msg.send()
msgexists = True
if msgexists is not True:
stm = time.localtime()
h = stm.tm_hour
m = stm.tm_min
s = stm.tm_sec
# append time as a kind of serial number to prevent FT1XDR from
# thinking this is a duplicate message.
# The FT1XDR pretty much ignores the aprs message number in this
# regard. The FTM400 gets it right.
reply = "No new msg {}:{}:{}".format(
str(h).zfill(2),
str(m).zfill(2),
str(s).zfill(2),
)
# messaging.send_message(fromcall, reply)
msg = messaging.TextMessage(CONFIG["aprs"]["login"], fromcall, reply)
msg.send()
# check email more often since we're resending one now
check_email_delay = 60
server.logout()
# end resend_email()
class APRSDEmailThread(threads.APRSDThread):
def __init__(self, msg_queues, config):
super().__init__("EmailThread")
self.msg_queues = msg_queues
self.config = config
@trace.trace
def run(self):
global check_email_delay
LOG.debug("Starting")
check_email_delay = 60
past = datetime.datetime.now()
while not self.thread_stop:
time.sleep(5)
stats.APRSDStats().email_thread_update()
# always sleep for 5 seconds and see if we need to check email
# This allows CTRL-C to stop the execution of this loop sooner
# than check_email_delay time
now = datetime.datetime.now()
if now - past > datetime.timedelta(seconds=check_email_delay):
# It's time to check email
# slowly increase delay every iteration, max out at 300 seconds
# any send/receive/resend activity will reset this to 60 seconds
if check_email_delay < 300:
check_email_delay += 1
LOG.debug("check_email_delay is " + str(check_email_delay) + " seconds")
shortcuts = CONFIG["aprsd"]["email"]["shortcuts"]
# swap key/value
shortcuts_inverted = {v: k for k, v in shortcuts.items()}
date = datetime.datetime.now()
month = date.strftime("%B")[:3] # Nov, Mar, Apr
day = date.day
year = date.year
today = f"{day}-{month}-{year}"
server = None
try:
server = _imap_connect()
except Exception as e:
LOG.exception("IMAP failed to connect.", e)
if not server:
continue
try:
messages = server.search(["SINCE", today])
except Exception as e:
LOG.exception("IMAP failed to search for messages since today.", e)
continue
LOG.debug(f"{len(messages)} messages received today")
try:
_msgs = server.fetch(messages, ["ENVELOPE"])
except Exception as e:
LOG.exception("IMAP failed to fetch/flag messages: ", e)
continue
for msgid, data in _msgs.items():
envelope = data[b"ENVELOPE"]
LOG.debug(
'ID:%d "%s" (%s)'
% (msgid, envelope.subject.decode(), envelope.date),
)
f = re.search(
r"'([[A-a][0-9]_-]+@[[A-a][0-9]_-\.]+)",
str(envelope.from_[0]),
)
if f is not None:
from_addr = f.group(1)
else:
from_addr = "noaddr"
# LOG.debug("Message flags/tags: " + str(server.get_flags(msgid)[msgid]))
# if "APRS" not in server.get_flags(msgid)[msgid]:
# in python3, imap tags are unicode. in py2 they're strings. so .decode them to handle both
try:
taglist = [
x.decode(errors="ignore")
for x in server.get_flags(msgid)[msgid]
]
except Exception as e:
LOG.exception("Failed to get flags.", e)
break
if "APRS" not in taglist:
# if msg not flagged as sent via aprs
try:
server.fetch([msgid], ["RFC822"])
except Exception as e:
LOG.exception("Failed single server fetch for RFC822", e)
break
(body, from_addr) = parse_email(msgid, data, server)
# unset seen flag, will stay bold in email client
try:
server.remove_flags(msgid, [imapclient.SEEN])
except Exception as e:
LOG.exception("Failed to remove flags SEEN", e)
# Not much we can do here, so lets try and
# send the aprs message anyway
if from_addr in shortcuts_inverted:
# reverse lookup of a shortcut
from_addr = shortcuts_inverted[from_addr]
reply = "-" + from_addr + " " + body.decode(errors="ignore")
msg = messaging.TextMessage(
self.config["aprs"]["login"],
self.config["ham"]["callsign"],
reply,
)
self.msg_queues["tx"].put(msg)
# flag message as sent via aprs
try:
server.add_flags(msgid, ["APRS"])
# unset seen flag, will stay bold in email client
except Exception as e:
LOG.exception("Couldn't add APRS flag to email", e)
try:
server.remove_flags(msgid, [imapclient.SEEN])
except Exception as e:
LOG.exception("Couldn't remove seen flag from email", e)
# check email more often since we just received an email
check_email_delay = 60
# reset clock
LOG.debug("Done looping over Server.fetch, logging out.")
past = datetime.datetime.now()
try:
server.logout()
except Exception as e:
LOG.exception("IMAP failed to logout: ", e)
continue
else:
# We haven't hit the email delay yet.
# LOG.debug("Delta({}) < {}".format(now - past, check_email_delay))
pass
# Remove ourselves from the global threads list
threads.APRSDThreadList().remove(self)
LOG.info("Exiting")
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