[DockerApi] Rename DockerApi to Controller and add mailcow-adm tool

data/Dockerfiles/controller/mailcow-adm/modules/Mailer.py

@@ -0,0 +1,64 @@
+import smtplib
+import json
+import os
+from email.mime.text import MIMEText
+from email.mime.multipart import MIMEMultipart
+from jinja2 import Environment, BaseLoader
+
+class Mailer:
+    def __init__(self, smtp_host, smtp_port, username, password, use_tls=True):
+        self.smtp_host = smtp_host
+        self.smtp_port = smtp_port
+        self.username = username
+        self.password = password
+        self.use_tls = use_tls
+        self.server = None
+        self.env = Environment(loader=BaseLoader())
+
+    def connect(self):
+        print("Connecting to the SMTP server...")
+        self.server = smtplib.SMTP(self.smtp_host, self.smtp_port)
+        if self.use_tls:
+            self.server.starttls()
+            print("TLS activated!")
+        if self.username and self.password:
+            self.server.login(self.username, self.password)
+            print("Authenticated!")
+
+    def disconnect(self):
+        if self.server:
+            try:
+                if self.server.sock:
+                    self.server.quit()
+            except smtplib.SMTPServerDisconnected:
+                pass
+            finally:
+                self.server = None
+
+    def render_inline_template(self, template_string, context):
+        template = self.env.from_string(template_string)
+        return template.render(context)
+
+    def send_mail(self, subject, from_addr, to_addrs, template, context = {}):
+        try:
+            if template == "":
+                print("Cannot send email, template is empty!")
+                return "Failed: Template is empty."
+
+            body = self.render_inline_template(template, context)
+
+            msg = MIMEMultipart()
+            msg['From'] = from_addr
+            msg['To'] = ', '.join(to_addrs) if isinstance(to_addrs, list) else to_addrs
+            msg['Subject'] = subject
+            msg.attach(MIMEText(body, 'html'))
+
+            self.connect()
+            self.server.sendmail(from_addr, to_addrs, msg.as_string())
+            self.disconnect()
+            return f"Success: Email sent to {msg['To']}"
+        except Exception as e:
+            print(f"Error during send_mail: {type(e).__name__}: {e}")
+            return f"Failed: {type(e).__name__}: {e}"
+        finally:
+            self.disconnect()