class Blob
+ extend DbCurrentTime
+
+ def initialize locator
+ @locator = locator
+ end
+
+ def empty?
+ !!@locator.match(/^d41d8cd98f00b204e9800998ecf8427e(\+.*)?$/)
+ end
# In order to get a Blob from Keep, you have to prove either
# [a] you have recently written it to Keep yourself, or
# The 'opts' argument should include:
# [required] :key - the Arvados server-side blobstore key
# [required] :api_token - user's API token
- # [optional] :ttl - number of seconds before this request expires
+ # [optional] :ttl - number of seconds before signature should expire
+ # [optional] :expire - unix timestamp when signature should expire
#
def self.sign_locator blob_locator, opts
# We only use the hash portion for signatures.
blob_hash = blob_locator.split('+').first
- # Generate an expiry timestamp (seconds since epoch, base 16)
- timestamp = (Time.now.to_i + (opts[:ttl] || 600)).to_s(16)
+ # Generate an expiry timestamp (seconds after epoch, base 16)
+ if opts[:expire]
+ if opts[:ttl]
+ raise "Cannot specify both :ttl and :expire options"
+ end
+ timestamp = opts[:expire]
+ else
+ timestamp = db_current_time.to_i + (opts[:ttl] || 1209600)
+ end
+ timestamp_hex = timestamp.to_s(16)
# => "53163cb4"
# Generate a signature.
signature =
- generate_signature opts[:key], blob_hash, opts[:api_token], timestamp
+ generate_signature opts[:key], blob_hash, opts[:api_token], timestamp_hex
- blob_locator + '+A' + signature + '@' + timestamp
+ blob_locator + '+A' + signature + '@' + timestamp_hex
end
# Blob.verify_signature
if !timestamp.match /^[\da-f]+$/
raise Blob::InvalidSignatureError.new 'Timestamp is not a base16 number.'
end
- if timestamp.to_i(16) < Time.now.to_i
+ if timestamp.to_i(16) < db_current_time.to_i
raise Blob::InvalidSignatureError.new 'Signature expiry time has passed.'
end