Add EventBridge scheduling: schedule_reminder, list_reminders, cancel_reminder

src/lambdas/scheduler/handler.py

@@ -0,0 +1,29 @@
+"""EventBridge-triggered Lambda: sends a Telegram reminder then deletes the rule."""
+import json
+import os
+import boto3
+import urllib.request
+
+
+def handler(event, context):
+    chat_id = event['chat_id']
+    message = event['message']
+    rule_name = event['rule_name']
+
+    # Fetch bot token
+    sm = boto3.client('secretsmanager', region_name='us-east-1')
+    token = sm.get_secret_value(SecretId=os.environ['TELEGRAM_BOT_TOKEN_SECRET_ARN'])['SecretString']
+
+    # Send Telegram message
+    payload = json.dumps({'chat_id': chat_id, 'text': message}).encode()
+    req = urllib.request.Request(
+        f'https://api.telegram.org/bot{token}/sendMessage',
+        data=payload,
+        headers={'Content-Type': 'application/json'},
+    )
+    urllib.request.urlopen(req)
+
+    # Delete the one-time rule
+    eb = boto3.client('events', region_name='us-east-1')
+    eb.remove_targets(Rule=rule_name, Ids=['scheduler'])
+    eb.delete_rule(Name=rule_name)