Merge first working iteration to main

README

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+To install dependencies, use the included requirements file with python pip, i.e.
+	pip3 install -r requirements.txt
+

requirements.txt

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+boto3==1.26.99
+botocore==1.29.99
+requests==2.28.2

s3share.py

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+#!/usr/bin/env python3
+
+import logging
+import boto3
+from botocore.exceptions import ClientError
+import requests
+import argparse
+from botocore.client import Config
+
+region = None
+
+parser = argparse.ArgumentParser(description="Generate expiring S3 URL")
+parser.add_argument("-b", "--bucket", help = "S3 bucket name", required=True, type=str)
+parser.add_argument("-o", "--object", help = "S3 object name", required=True, type=str)
+parser.add_argument("-r", "--region", help = "S3 region name", required=False, default='eu-west-1', type=str)
+parser.add_argument("-e", "--expiry", help = "Expiry time in seconds", required=True, type=int)
+args = parser.parse_args()
+
+def create_presigned_url(bucket_name, object_name, expiration=args.expiry):
+  client_config = Config(
+    signature_version = 'v4',
+    retries = {
+      'max_attempts': 10,
+      'mode': 'standard'
+    }
+  )
+
+  s3_client = boto3.session.Session(
+    region_name=boto3.client('s3').get_bucket_location(Bucket=bucket_name)["LocationConstraint"]
+  ).client("s3", config=client_config)
+
+  try:
+    response = s3_client.generate_presigned_url('get_object', Params={
+      'Bucket': bucket_name,
+      'Key': object_name
+    },
+    ExpiresIn=expiration
+  )
+  except ClientError as e:
+    logging.error(e)
+    return None
+
+  return response
+
+url = create_presigned_url(args.bucket, args.object, args.expiry)
+if url is not None:
+  print(url)