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# -*- coding: utf-8 -*-

__author__ = "Chirag Rathod (Srce Cde)"

__license__ = "MIT"

__email__ = "chiragr83@gmail.com"

__maintainer__ = "Chirag Rathod (Srce Cde)"

import json

import base64

import boto3

def lambda_handler(event, context):

s3 = boto3.client("s3")

# For fetching bucket_name & file_name using proxy integration method from API Gateway

bucket_name = event["pathParameters"]["bucket"]

file_name = event["queryStringParameters"]["file"]

# For fetching bucket_name & file_name using legacy method from API Gateway

bucket_name = event["params"]["path"]["bucket"]

file_name = event["params"]["querystring"]["file"]

"""

1. Generate pre-signed URL for downloading file

2. Replace get_object with put_object for generating pre-signed URL to upload file

3. Use PUT method while uploading file using Pre-Signed URL

"""

URL = s3.generate_presigned_url(

"get_object", Params={"Bucket": bucket_name, "Key": file_name}, ExpiresIn=3600

)

"""

1. Generate pre-signed URL for downloading file

2. Use POST method while uploading file using Pre-Signed URL

"""

URL = s3.generate_presigned_post(

Bucket=bucket_name, Key=file_name, Fields=None, Conditions=None, ExpiresIn=3600

)

return {

"statusCode": 200,

"headers": {"Content-Type": "application/json"},

"body": json.dumps({"URL": URL}),

}