Class: Fog::AWS::Storage::Real::S3Streamer

Inherits:
Object
  • Object
show all
Defined in:
lib/fog/aws/storage.rb

Overview

See docs.aws.amazon.com/AmazonS3/latest/API/sigv4-streaming.html

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(body, signature, signer, date) ⇒ S3Streamer

Returns a new instance of S3Streamer.



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# File 'lib/fog/aws/storage.rb', line 718

def initialize(body, signature, signer, date)
  self.body = body
  self.date = date
  self.signature = signature
  self.initial_signature = signature
  self.signer = signer
  if body.respond_to?(:binmode)
    body.binmode
  end

  if body.respond_to?(:pos=)
    body.pos = 0
  end

end

Instance Attribute Details

#body ⇒ Object

Returns the value of attribute body.



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# File 'lib/fog/aws/storage.rb', line 717

def body
  @body
end

#date ⇒ Object

Returns the value of attribute date.



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# File 'lib/fog/aws/storage.rb', line 717

def date
  @date
end

#finished ⇒ Object

Returns the value of attribute finished.



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# File 'lib/fog/aws/storage.rb', line 717

def finished
  @finished
end

#initial_signature ⇒ Object

Returns the value of attribute initial_signature.



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# File 'lib/fog/aws/storage.rb', line 717

def initial_signature
  @initial_signature
end

#signature ⇒ Object

Returns the value of attribute signature.



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# File 'lib/fog/aws/storage.rb', line 717

def signature
  @signature
end

#signer ⇒ Object

Returns the value of attribute signer.



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# File 'lib/fog/aws/storage.rb', line 717

def signer
  @signer
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/fog/aws/storage.rb', line 742

def call
  if finished
    ''
  else
    next_chunk
  end
end

#next_chunk ⇒ Object 



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# File 'lib/fog/aws/storage.rb', line 750

def next_chunk
  data = body.read(0x10000)
  if data.nil?
    self.finished = true
    data = ''
  end
  self.signature = sign_chunk(data, signature)
  "#{data.length.to_s(16)};chunk-signature=#{signature}\r\n#{data}\r\n"
end

#rewind ⇒ Object

called if excon wants to retry the request. As well as rewinding the body we must also reset the signature



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# File 'lib/fog/aws/storage.rb', line 736

def rewind
  self.signature = initial_signature
  self.finished = false
  body.rewind
end

#sign_chunk(data, previous_signature) ⇒ Object 



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# File 'lib/fog/aws/storage.rb', line 761

def sign_chunk(data, previous_signature)
  string_to_sign = <<-DATA
AWS4-HMAC-SHA256-PAYLOAD
#{date.to_iso8601_basic}
#{signer.credential_scope(date)}
#{previous_signature}
#{OpenSSL::Digest::SHA256.hexdigest('')}
#{OpenSSL::Digest::SHA256.hexdigest(data)}
DATA
  hmac = signer.derived_hmac(date)
  hmac.sign(string_to_sign.strip).unpack('H*').first
end