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lambda_function.py
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lambda_function.py
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import boto3
import json
import urllib3
import os
def lambda_handler(event, context):
# CloudFlare connection
http = urllib3.PoolManager()
r = http.request('GET', 'https://api.cloudflare.com/client/v4/ips')
json_content = json.loads(r.data)
ipv4 = json_content["result"]["ipv4_cidrs"]
ipv6 = json_content["result"]["ipv6_cidrs"]
ip_list = ipv4 + ipv6
# S3 connection
s3 = boto3.client('s3')
bucket_name = os.environ['BUCKET_NAME']
bucket_policy = {
"Version": "2012-10-17",
"Statement": [
{
"Sid": "PublicReadForGetBucketObjects",
"Effect": "Allow",
"Principal": "*",
"Action": "s3:GetObject",
"Resource": f"arn:aws:s3:::{bucket_name}/*",
"Condition": {
"IpAddress": {
"aws:SourceIp": ip_list
}
}
}
]
}
bucket_policy = json.dumps(bucket_policy)
s3.put_bucket_policy(Bucket=bucket_name, Policy=bucket_policy)