href/generate-form.py

## generate-form.py
#!/usr/bin/env python
# This script generates an example HTML form that can directly upload files to
# an S3 bucket at cloudscale.ch.
#
# Based on the following work:
#
# - http://archive.is/fZdSu
# - http://archive.is/NXQno
#
# Requires Python 3 and boto3 to work:
#
#   python3 -m venv venv
#   source venv/bin/activate
#   pip install boto3
#
# To use, export the following variables, then run the script:
#
#   export CLOUDSCALE_ACCESS_KEY="***"
#   export CLOUDSCALE_SECRET_KEY="***"
#   export CLOUDSCALE_BUCKET="my-bucket"
#   export CLOUDSCALE_REGION="lpg"  # or "rma"
#
#   python3 generate-form.py > form.html
#
# The form.html can then be opened in a browser and used to upload files to
# the configured bucket.
#
# To add specific conditions for your use-case, have a look at the
# generate_presigned_post documentation and adjust the code below:
#
# - http://archive.is/1mcfG#S3.Client.generate_presigned_post
#
# Notably, you might want to change the ExpiresIn default value of 1h (3600s),
# if you are not dynamically generating this form.
#
import boto3
import os
import textwrap

ACCESS_KEY = os.environ['CLOUDSCALE_ACCESS_KEY']
SECRET_KEY = os.environ['CLOUDSCALE_SECRET_KEY']

BUCKET = os.environ['CLOUDSCALE_BUCKET']
REGION = os.environ['CLOUDSCALE_REGION']

session = boto3.session.Session(
    aws_access_key_id=ACCESS_KEY,
    aws_secret_access_key=SECRET_KEY,
    region_name=REGION)

s3_client = session.client(
    service_name='s3',
    endpoint_url=f"https://objects.{REGION}.cloudscale.ch",
    config=boto3.session.Config(signature_version='s3v4'),)

form_data = s3_client.generate_presigned_post(
    Conditions=[
        ["starts-with", "$Content-Type", ""],
    ],
    Bucket=BUCKET,
    Key=r'${filename}',
    ExpiresIn=3600)

input_fields = '\n'.join(
    f'<input type="hidden" name="{k}" value="{v}" />'
    for k, v in form_data['fields'].items())

print(f"""\
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    </head>

    <body>
        <form action="{form_data['url']}" method="post"
              enctype="multipart/form-data">

            {textwrap.indent(input_fields, ' ' * 12)}

            <input type="file"   name="file" /> <br />
            <input type="submit" name="submit" value="Upload to object storage" />
        </form>
</html>
""")
	#!/usr/bin/env python
	# This script generates an example HTML form that can directly upload files to
	# an S3 bucket at cloudscale.ch.
	#
	# Based on the following work:
	#
	# - http://archive.is/fZdSu
	# - http://archive.is/NXQno
	#
	# Requires Python 3 and boto3 to work:
	#
	# python3 -m venv venv
	# source venv/bin/activate
	# pip install boto3
	#
	# To use, export the following variables, then run the script:
	#
	# export CLOUDSCALE_ACCESS_KEY="***"
	# export CLOUDSCALE_SECRET_KEY="***"
	# export CLOUDSCALE_BUCKET="my-bucket"
	# export CLOUDSCALE_REGION="lpg" # or "rma"
	#
	# python3 generate-form.py > form.html
	#
	# The form.html can then be opened in a browser and used to upload files to
	# the configured bucket.
	#
	# To add specific conditions for your use-case, have a look at the
	# generate_presigned_post documentation and adjust the code below:
	#
	# - http://archive.is/1mcfG#S3.Client.generate_presigned_post
	#
	# Notably, you might want to change the ExpiresIn default value of 1h (3600s),
	# if you are not dynamically generating this form.
	#
	import boto3
	import os
	import textwrap

	ACCESS_KEY = os.environ['CLOUDSCALE_ACCESS_KEY']
	SECRET_KEY = os.environ['CLOUDSCALE_SECRET_KEY']

	BUCKET = os.environ['CLOUDSCALE_BUCKET']
	REGION = os.environ['CLOUDSCALE_REGION']

	session = boto3.session.Session(
	aws_access_key_id=ACCESS_KEY,
	aws_secret_access_key=SECRET_KEY,
	region_name=REGION)

	s3_client = session.client(
	service_name='s3',
	endpoint_url=f"https://objects.{REGION}.cloudscale.ch",
	config=boto3.session.Config(signature_version='s3v4'),)

	form_data = s3_client.generate_presigned_post(
	Conditions=[
	["starts-with", "$Content-Type", ""],
	],
	Bucket=BUCKET,
	Key=r'${filename}',
	ExpiresIn=3600)

	input_fields = '\n'.join(
	f'<input type="hidden" name="{k}" value="{v}" />'
	for k, v in form_data['fields'].items())

	print(f"""\
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	</head>

	<body>
	<form action="{form_data['url']}" method="post"
	enctype="multipart/form-data">

	{textwrap.indent(input_fields, ' ' * 12)}

	<input type="file" name="file" /> <br />
	<input type="submit" name="submit" value="Upload to object storage" />
	</form>
	</html>
	""")