105 lines
3.3 KiB
Python
105 lines
3.3 KiB
Python
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import os
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import smtplib
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from time import sleep
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from jinja2 import Environment, PackageLoader
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from email.mime.multipart import MIMEMultipart
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from email.mime.text import MIMEText
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from urllib.parse import urlparse
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class Mailer(object):
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def __init__(self, url):
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scheme, netloc, path, params, query, fragment = urlparse(url)
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scheme = scheme.lower()
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if path:
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raise ValueError("Path for URL not supported")
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if params:
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raise ValueError("Parameters for URL not supported")
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if query:
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raise ValueError("Query for URL not supported")
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if fragment:
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raise ValueError("Fragment for URL not supported")
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self.username = None
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self.password = ""
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if scheme == "smtp":
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self.secure = False
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self.port = 25
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elif scheme == "smtps":
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self.secure = True
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self.port = 465
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else:
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raise ValueError("Unknown scheme '%s', currently SMTP and SMTPS are only supported" % scheme)
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if "@" in netloc:
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credentials, netloc = netloc.split("@")
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if ":" in credentials:
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self.username, self.password = credentials.split(":")
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else:
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self.username = credentials
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if ":" in netloc:
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self.server, port_str = netloc.split(":")
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self.port = int(port_str)
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else:
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self.server = netloc
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self.env = Environment(loader=PackageLoader("certidude", "email_templates"))
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self.conn = None
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def reconnect(self):
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# Gmail employs some sort of IPS
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# https://accounts.google.com/DisplayUnlockCaptcha
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print("Connecting to:", self.server, self.port)
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self.conn = smtplib.SMTP(self.server, self.port)
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if self.secure:
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self.conn.starttls()
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if self.username and self.password:
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self.conn.login(self.username, self.password)
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def enqueue(self, sender, recipients, subject, template, **context):
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self.send(sender, recipients, subject, template, **context)
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def send(self, sender, recipients, subject, template, **context):
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recipients = [j for j in recipients if j]
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if not recipients:
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print("No recipients to send e-mail to!")
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return
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print("Sending e-mail to:", recipients, "body follows:")
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msg = MIMEMultipart("alternative")
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msg["Subject"] = subject
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msg["From"] = sender
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msg["To"] = ", ".join(recipients)
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text = self.env.get_template(template + ".txt").render(context)
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html = self.env.get_template(template + ".html").render(context)
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print(text)
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part1 = MIMEText(text, "plain")
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part2 = MIMEText(html, "html")
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msg.attach(part1)
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msg.attach(part2)
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backoff = 1
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while True:
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try:
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if not self.conn:
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self.reconnect()
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self.conn.sendmail(sender, recipients, msg.as_string())
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return
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except smtplib.SMTPServerDisconnected:
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print("Connection to %s unexpectedly closed, probably TCP timeout, backing off for %d second" % (self.server, backoff))
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self.reconnect()
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backoff = backoff * 2
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sleep(backoff)
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