Using presigned URLs with Backblaze B2 + AWS Python SDK

upload_file_presigned_url.py

#! /usr/bin/env python

'''
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code examples, so we make the samples available by several different
licenses.  One option is the MIT license (below).  Other options are
available here:
    https://www.backblaze.com/using_b2_code.html
The MIT License (MIT)
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'''

# Using presigned URLs with Backblaze B2 + AWS Python SDK

import requests
import boto3
from botocore.config import Config

# Specify the B2 endpoint for the bucket.
# This can be found here: https://secure.backblaze.com/b2_buckets.htm

region= 'us-west-000'
endpoint = f'https://s3.{region}.backblazeb2.com'
bucket_name = 'mybucketgoeshere'

# Specify the B2 application key.
# This can be found here: https://secure.backblaze.com/app_keys.htm
# Create a new key and ensure that "Allow List All Bucket Names" is checked.

app_key_id = '000862xxxxxxxxxxxxxx'
app_key_sec = 'K000xxxxxxxxxxxxxxxxxxx'

key_name = 'puppy.jpeg'

# Create a boto3.client using AWS v4 authentication. Backblaze B2 does not
# support v2 authentication as it has been deprecated by AWS.

s3 = boto3.client('s3',
                  endpoint_url=endpoint,
                  aws_access_key_id=app_key_id,
                  aws_secret_access_key=app_key_sec,
                  region_name=region,
                  config=Config(signature_version = 's3v4'))
params = {'Bucket': bucket_name, 'Key': key_name}

# Ensure the presigned URL allows the use of HTTP PUT method. Backblaze B2
# does not currently support HTTP POST.

presigned_url = s3.generate_presigned_url("put_object", Params=params, ExpiresIn=30)

with open(key_name, "rb") as file_to_upload:
    put_response = requests.put(presigned_url, data = file_to_upload)

print(put_response)