Update email parameters in parameters.yaml and modify SMTP connection in survBot.py

- Update mailserver, port, user, password, and sender in parameters.yaml
- Modify SMTP connection in survBot.py to support starttls connection if server is not "localhost"
- Read password from docker secret or environment variable if set to 'DOCKER' or 'ENV' respectively

parameters.yaml

@@ -137,9 +137,12 @@ html_logo: "logo.png"
 
 # E-mail notifications
 EMAIL:
-  mailserver: "localhost"
+  mailserver: "smtp.rub.de"                   # mail server
+  port: 465                               # mail port
+  user: "DOCKER"                      # mail user, read from environment variable if set to "ENV" or from docker secret if set to "DOCKER"
+  password: "DOCKER"                  # mail password, read from environment variable if set to "ENV" or from docker secret if set to "DOCKER"
   addresses: ["marcel.paffrath@rub.de", "kasper.fischer@rub.de"]  # list of mail addresses for info mails
-  sender: "webmaster@geophysik.ruhr-uni-bochum.de" # mail sender
+  sender: "RUB SeisObs <seisobs@ruhr-uni-bochum.de>" # mail sender
   stations_blacklist: []                     # do not send emails for specific stations
   networks_blacklist: []                           # do not send emails for specific network
   # specify recipients for single stations in a yaml: key = email-address, val = station list (e.g. [1Y.GR01, 1Y.GR02])

survBot.py

@@ -758,7 +758,42 @@ class StationQC(object):
         msg.add_alternative(html_str, subtype='html')
 
         # send message via SMTP server
-        s = smtplib.SMTP(server)
+        # set up starttls connection if server is not "localhost"
+        if server == 'localhost':
+            # create connection to localhost
+            s = smtplib.SMTP(server)
+        else:
+            user = mail_params.get('user')
+            # read user from docker secret if it is set to 'DOCKER' or
+            # read user from environment variable if it is set to 'ENV'
+            if user == 'DOCKER':
+                try:
+                    with open('/run/secrets/mail_user', 'r') as f:
+                        user = f.read().strip()
+                except FileNotFoundError as e:
+                    logging.error('Could not read mail user from docker secret')
+                    logging.error(e)
+            elif user == 'ENV':
+                user = os.environ.get(mail_params.get('user_env'))
+            
+            password = mail_params.get('password')
+            # read password from docker secret if it is set to 'DOCKER' or
+            # read password from environment variable if it is set to 'ENV'
+            if password == 'DOCKER':
+                try:
+                    with open('/run/secrets/mail_password', 'r') as f:
+                        password = f.read().strip()
+                except FileNotFoundError as e:
+                    logging.error('Could not read mail password from docker secret')
+                    logging.error(e)
+            elif password == 'ENV':
+                password = os.environ.get(mail_params.get('password_env'))
+
+            # create SSL connection to server
+            s = smtplib.SMTP_SSL(server, mail_params.get('port'))
+            s.login(mail_params.get('user'), mail_params.get('password'))
+
+        # send mail and close connection
         s.send_message(msg)
         s.quit()