Class: Imageproxy::Signature

Inherits:
Object
  • Object
show all
Defined in:
lib/imageproxy/signature.rb

Class Method Summary collapse

Class Method Details

.correct?(signature, path, secret) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/imageproxy/signature.rb', line 21

def self.correct?(signature, path, secret)
  created = create(path, secret)
  signature != nil && path != nil && secret != nil && (created == signature || created == signature.tr('+/', '-_'))
end

.create(path, secret) ⇒ Object 



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# File 'lib/imageproxy/signature.rb', line 6

def self.create(path, secret)
  Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha1'), secret, remove_signature_from(path))).strip.tr('+/', '-_')
end

.remove_signature_from(path) ⇒ Object 



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# File 'lib/imageproxy/signature.rb', line 10

def self.remove_signature_from(path)
  #TODO: do this in fewer passes
  path.
    sub(%r{&signature(=[^&]*)?(?=&|$)}, "").
    sub(%r{\?signature(=[^&]*)?&}, "?").
    sub(%r{\?signature(=[^&]*)?$}, "").
    sub(%r{/signature/[^\?/]+/}, "/").
    sub(%r{/signature/[^\?/]+\?}, "?").
    sub(%r{/signature/[^\?/]+}, "")
end