Class: Stripe::RequestSigningAuthenticator

Inherits:
Object
  • Object
show all
Defined in:
lib/stripe/request_signing_authenticator.rb

Constant Summary collapse

AUTHORIZATION_HEADER_NAME = 
"Authorization"
CONTENT_TYPE_HEADER_NAME = 
"Content-Type"
STRIPE_CONTEXT_HEADER_NAME = 
"Stripe-Context"
STRIPE_ACCOUNT_HEADER_NAME = 
"Stripe-Account"
CONTENT_DIGEST_HEADER_NAME = 
"Content-Digest"
SIGNATURE_INPUT_HEADER_NAME = 
"Signature-Input"
SIGNATURE_HEADER_NAME = 
"Signature"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(auth_token, sign_lambda) ⇒ RequestSigningAuthenticator

Returns a new instance of RequestSigningAuthenticator.

Raises:

  • (ArgumentError) 


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# File 'lib/stripe/request_signing_authenticator.rb', line 15

def initialize(auth_token, sign_lambda)
  raise ArgumentError, "auth_token must be a string" unless auth_token.is_a?(String)
  raise ArgumentError, "sign_lambda must be a lambda" unless sign_lambda.is_a?(Proc)

  @auth_token = auth_token
  @sign_lambda = sign_lambda
end

Instance Attribute Details

#auth_token ⇒ Object (readonly)

Returns the value of attribute auth_token.



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# File 'lib/stripe/request_signing_authenticator.rb', line 13

def auth_token
  @auth_token
end

#sign_lambda ⇒ Object (readonly)

Returns the value of attribute sign_lambda.



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# File 'lib/stripe/request_signing_authenticator.rb', line 13

def sign_lambda
  @sign_lambda
end

Instance Method Details

#authenticate(method, headers, body) ⇒ Object 



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# File 'lib/stripe/request_signing_authenticator.rb', line 23

def authenticate(method, headers, body)
  covered_headers = [CONTENT_TYPE_HEADER_NAME,
                     CONTENT_DIGEST_HEADER_NAME,
                     STRIPE_CONTEXT_HEADER_NAME,
                     STRIPE_ACCOUNT_HEADER_NAME,
                     AUTHORIZATION_HEADER_NAME,]

  headers[AUTHORIZATION_HEADER_NAME] = "STRIPE-V2-SIG #{auth_token}"

  if method == :get
    covered_headers -= [CONTENT_TYPE_HEADER_NAME,
                        CONTENT_DIGEST_HEADER_NAME,]
  else
    content = body || ""
    headers[CONTENT_DIGEST_HEADER_NAME] =
      %(sha-256=:#{content_digest(content)}:)
  end

  covered_headers_formatted = covered_headers
                              .map { |string| %("#{string.downcase}") }
                              .join(" ")

  signature_input = "(#{covered_headers_formatted});created=#{created_time}"

  inputs = covered_headers
           .map { |header| %("#{header.downcase}": #{headers[header]}) }
           .join("\n")

  signature_base = %(#{inputs}\n"@signature-params": #{signature_input})
                   .encode(Encoding::UTF_8)

  headers[SIGNATURE_INPUT_HEADER_NAME] = "sig1=#{signature_input}"

  headers[SIGNATURE_HEADER_NAME] =
    "sig1=:#{encoded_signature(signature_base)}:"
end