add ipv4 update script

website/Dockerfile

@@ -1,8 +1,12 @@
 FROM ubuntu:22.04
 
 # install dependencies
+ENV TZ=America/Los_Angeles
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
 RUN apt-get update && apt-get upgrade
-RUN apt-get install -y nginx certbot python3-certbot-nginx
+RUN apt-get install -y nginx certbot python3-certbot-nginx python3-pip
+RUN pip3 install sendgrid
 
 RUN rm /etc/nginx/sites-enabled/default
 
@@ -13,4 +17,5 @@ COPY html /var/www/matthewtran.com/html
 
 # start script
 WORKDIR /root
+COPY sendgrid.ke[y] ip_update.py ./
 COPY entry.sh ./

website/entry.sh

@@ -15,6 +15,7 @@ certbot --nginx \
     -d git.matthewtran.com
 
 nginx -s reload
+python3 ip_update.py &
 
 # try renew once a day
 while true

website/ip_update.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+
+import time
+import urllib.request
+from pathlib import Path
+from sendgrid import SendGridAPIClient
+from sendgrid.helpers.mail import Mail
+
+if __name__ == '__main__':
+    sg = SendGridAPIClient(Path('sendgrid.key').read_text())
+
+    old_ipv4, old_ipv6 = None, None
+    while True:
+        ipv4 = urllib.request.urlopen('https://v4.ident.me').read().decode('utf8')
+        ipv6 = None
+        # ipv6 = urllib.request.urlopen('https://v6.ident.me').read().decode('utf8')
+
+        if ipv4 != old_ipv4 or ipv6 != old_ipv6:
+            msg = Mail(
+                from_email='matthewlamtran@berkeley.edu',
+                to_emails='mtran319@gmail.com',
+                subject='pls update ip',
+                html_content=f'<p>ipv4: {ipv4}</p><p>ipv6: {ipv6}</p>'
+            )
+            try:
+                print(f'IP changed to {ipv4} and {ipv6}')
+                resp = sg.send(msg)
+            except Exception as e:
+                print(e.message)
+                sg = SendGridAPIClient(Path('sendgrid.key').read_text())
+
+        old_ipv4, old_ipv6 = ipv4, ipv6
+        time.sleep(60 * 60) # 60 min