postWithCurlUsingS3PresignedPostDict.sh

#!/bin/bash

# using e.g. boto3 to generate a presigned POST url for uploading to S3:
# https://boto3.amazonaws.com/v1/documentation/api/1.35.6/reference/services/s3/client/generate_presigned_post.html
# yields a dict with a url and a bunch of fields.
#
# We can take that data and turn it into a curl request for testing
# https://repost.aws/questions/QU2Yq1fA_mRB-yAqC2_XpkVw/s3-signed-urls-via-the-cli-for-put-using-curl
#
# But, that's a pain to format. This script lets you specify a JSON file containing that dict and generates the command for you
#
# (to use that data in Python do like:
#
#		# files = { 'file': open(OBJECT_NAME_TO_UPLOAD, 'rb')}
#		files = {'file': ('sample.txt', 'this is a file\ngenerated by pytest')}
#		r = requests.post(upload_url, data=upload_fields, files=files)
#		assert r.status_code == 204

if [ -z $2 ]; then
	echo "Usage: postWithCurlUsingS3PresignedPostDict.sh <json file containing presigned info> <file to upload>"
	exit 0
fi
 
curl --verbose -X POST \
	-F key=`jq '.fields.key' $1` \
	-F AWSAccessKeyId=`jq '.fields.AWSAccessKeyId' $1` \
	-F x-amz-security-token=`jq '.fields["x-amz-security-token"]' $1` \
	-F policy=`jq '.fields.policy' $1` \
	-F signature=`jq '.fields.signature' $1` \
  -F file=@$2 \
	`jq -r '.url' $1`