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| import hashlib
import hmac
import json
import os
import re
import time
import uuid
import boto3
s3 = boto3.client("s3")
sns = boto3.client("sns")
PRIVATE_BUCKET = os.environ.get("PRIVATE_BUCKET")
PUBLIC_BUCKET = os.environ.get("PUBLIC_BUCKET")
SNS_TOPIC_ARN = os.environ.get("SNS_TOPIC_ARN")
TOKEN_SECRET = os.environ.get("TOKEN_SECRET")
TOKEN_TTL = 3600
ALLOWED_DOMAIN = "@cloudsecuritychampionship.com"
API_BASE_URL = os.environ.get("API_BASE_URL")
EMAIL_RE = re.compile(r"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$")
SNS_TOPIC_NAME = SNS_TOPIC_ARN.split(":")[-1] if SNS_TOPIC_ARN else ""
def _make_token():
ts = str(int(time.time()))
sig = hmac.new(TOKEN_SECRET.encode(), ts.encode(), hashlib.sha256).hexdigest()[:16]
return f"{ts}:{sig}"
def _verify_token(token):
try:
ts, sig = token.split(":", 1)
expected = hmac.new(
TOKEN_SECRET.encode(), ts.encode(), hashlib.sha256
).hexdigest()[:16]
if not hmac.compare_digest(sig, expected):
return False
if time.time() - int(ts) > TOKEN_TTL:
return False
return True
except Exception:
return False
def _read_template(template):
if ".." in template:
return None, "Invalid template name."
template_key = os.path.join("templates", f"{template}.txt")
try:
obj = s3.get_object(Bucket=PRIVATE_BUCKET, Key=template_key)
return obj["Body"].read().decode(), None
except Exception:
return None, "Template not found."
def handler(event, context):
is_apigw = "requestContext" in event
if is_apigw:
body = json.loads(event.get("body") or "{}")
resource_path = event.get("resource", "")
if resource_path == "/register":
token = body.get("token", "")
template = body.get("template", "default_balloon")
if not token or not _verify_token(token):
return _response(
403,
{
"status": "error",
"message": "Invalid or expired invitation token.",
},
)
content, err = _read_template(template)
if err:
return _response(400, {"status": "error", "message": err})
name = body.get("name", "Guest")
card_content = content.replace("{{name}}", name)
card_id = str(uuid.uuid4())
card_key = f"cards/{card_id}.html"
try:
s3.put_object(
Bucket=PUBLIC_BUCKET,
Key=card_key,
Body=card_content,
ContentType="text/html",
)
except Exception:
pass
card_url = f"https://{PUBLIC_BUCKET}.s3.amazonaws.com/{card_key}"
return _response(
200,
{
"status": "success",
"message": "Registration complete! Here is your birthday card.",
"card_url": card_url,
},
)
email = body.get("email", "")
if not email:
return _response(400, {"status": "error", "message": "Email is required."})
if not EMAIL_RE.match(email):
return _response(
400,
{"status": "error", "message": "Please enter a valid email address."},
)
if not email.endswith(ALLOWED_DOMAIN):
return _response(
403,
{
"status": "error",
"message": (
f"Only {ALLOWED_DOMAIN} email addresses are eligible."
f" Invitations are delivered via the {SNS_TOPIC_NAME}"
f" notification channel."
),
},
)
try:
sns.subscribe(
TopicArn=SNS_TOPIC_ARN,
Protocol="email",
Endpoint=email,
)
except Exception as e:
return _response(
500,
{"status": "error", "message": f"Failed to send invitation: {str(e)}"},
)
token = _make_token()
register_url = f"{API_BASE_URL}/register.html?token={token}"
try:
sns.publish(
TopicArn=SNS_TOPIC_ARN,
Subject="Your Birthday Party Invitation!",
Message=json.dumps(
{
"message": "You're invited to the S3 Birthday Party!",
"action": "Complete your registration to get your personalized birthday card.",
"registration_url": register_url,
"token": token,
"expires_in": "1 hour",
"generated_by": context.function_name,
}
),
)
except Exception:
pass
return _response(
200,
{
"status": "success",
"message": "Invitation sent! Check your email.",
},
)
token = event.get("token", "")
template = event.get("template", "default_balloon")
if not token or not _verify_token(token):
return {"status": "error", "message": "Invalid or expired invitation token."}
content, err = _read_template(template)
if err:
return {"status": "error", "message": err}
card_content = content.replace("{{name}}", event.get("name", "Friend"))
return {
"status": "success",
"data": {
"card_content": card_content,
},
}
def _response(status_code, body):
return {
"statusCode": status_code,
"headers": {
"Content-Type": "application/json",
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "POST, OPTIONS",
"Access-Control-Allow-Headers": "Content-Type",
},
"body": json.dumps(body),
}
|