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April 6, 2016 06:32
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Upload file to S3 with signature ver. 4
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# | |
# POST with signature v4 | |
# | |
require "base64" | |
require "openssl" | |
require "digest/sha1" | |
require "time" | |
aws_access_key_id = ENV["AWS_ACCESS_KEY_ID"] | |
aws_secret_key = ENV["AWS_SECRET_ACCESS_KEY"] | |
acl = "public-read" | |
s3_bucket = "mybucket" | |
current_time = Time.now | |
date = current_time.strftime("%Y%m%d") | |
region = "ap-northeast-1" | |
target_file = "test.txt" | |
timestamp = current_time.utc.iso8601.delete("-:") | |
# policy document | |
policy_document = <<EOS | |
{"expiration": "#{(current_time + 60 * 60).utc.iso8601}", | |
"conditions": [ | |
{"acl": "#{acl}"}, | |
{"bucket": "#{s3_bucket}"}, | |
["starts-with", "$key", ""], | |
{"x-amz-algorithm": "AWS4-HMAC-SHA256"}, | |
{"x-amz-credential": "#{aws_access_key_id}/#{date}/#{region}/s3/aws4_request"}, | |
{"x-amz-date": "#{timestamp}"}, | |
{"x-amz-server-side-encryption": "AES256"} | |
] | |
} | |
EOS | |
policy = Base64.encode64(policy_document).delete("\n") | |
# calc signature(v4) | |
sha256 = OpenSSL::Digest::SHA256.new | |
date_key = OpenSSL::HMAC.digest(sha256, "AWS4#{aws_secret_key}", date) | |
date_region_key = OpenSSL::HMAC.digest(sha256, date_key, region) | |
date_region_service_key = OpenSSL::HMAC.digest(sha256, date_region_key, "s3") | |
signing_key = OpenSSL::HMAC.digest(sha256, date_region_service_key, "aws4_request") | |
signature = OpenSSL::HMAC.hexdigest(sha256, signing_key, policy) | |
# upload | |
cmd = <<__CURL_COMMAND__ | |
curl -v -X POST \\ | |
-F acl="#{acl}" \\ | |
-F key="#{target_file}" \\ | |
-F policy="#{policy}" \\ | |
-F x-amz-algorithm="AWS4-HMAC-SHA256" \\ | |
-F x-amz-credential="#{aws_access_key_id}/#{date}/#{region}/s3/aws4_request" \\ | |
-F x-amz-date="#{timestamp}" \\ | |
-F x-amz-signature="#{signature}" \\ | |
-F x-amz-server-side-encryption="AES256" \\ | |
-F "file=@#{target_file}" \\ | |
https://#{s3_bucket}.s3.amazonaws.com/ | |
__CURL_COMMAND__ | |
puts cmd | |
puts `#{cmd}` |
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