Module: KindTapPlatform

Defined in:
lib/kindtap_platform.rb,
lib/kindtap_platform/version.rb

Constant Summary collapse

DEBUG = 
false
ALGO_PRE = 
"KT1"
ALGO = 
"#{ALGO_PRE}-HMAC-SHA256"
AUTH_TYPE = 
"#{ALGO_PRE.downcase}_request"
REGION = 
"us"
EQUALS_ENC = 
URI.encode_www_form_component("=")
EQUALS_EXPR = 
/=/
MULTI_WS_EXPR = 
/[ ][ ]+/
VERSION = 
'0.1.0'

Class Method Summary collapse

Class Method Details

.build_canon_headers(headers) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 23

def build_canon_headers(headers)
  parsed = headers.reduce({}) { |acc, (k, v)|
    acc.merge({ k.to_s.downcase => v.to_s.gsub(MULTI_WS_EXPR, " ") })
  }
  sorted = parsed.sort_by { |k, v| k.to_s.ord }
  sorted.reduce("") { |acc, cur| acc += "#{cur[0]}:#{cur[1]}\n" }
end

.build_canon_query(params) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 31

def build_canon_query(params)
  parsed = params.reduce({}) { |acc, (k, v)|
    acc.merge({ k.to_s => v.to_s.gsub(EQUALS_EXPR, EQUALS_ENC) })
  }
  sorted = parsed.sort_by { |k, v| k.to_s.ord }
  encoded = sorted.reduce([]) { |acc, cur|
    acc.push("#{URI.encode_www_form_component(cur[0])}=#{URI.encode_www_form_component(cur[1])}")
  }
  encoded.join("&")
end

.build_canon_uri(uri) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 42

def build_canon_uri(uri)
  parts = uri.split("/").filter { |p| p.length > 0 }
  if parts.length == 0
    return "/"
  end
  encoded = parts.reduce([]) { |acc, cur|
    acc.push(URI.encode_www_form_component(URI.encode_www_form_component(cur)))
  }
  "/#{encoded.join("/")}/"
end

.build_signed_headers(headers) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 53

def build_signed_headers(headers)
  parsed = headers.reduce([]) { |acc, cur| acc.push([cur[0].downcase]) }
  parsed.join(";")
end

.debug(*args) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 58

def debug(*args)
  if KindTapPlatform::DEBUG
    puts args
  end
end

.generate_signature_v1(service, secret, method, uri, date, headers, body, params) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 64

def generate_signature_v1(service, secret, method, uri, date, headers, body, params)
  canon_headers = build_canon_headers(headers)
  debug({ "canon_headers" => canon_headers })
  canon_query = build_canon_query(params)
  debug({ "canon_query" => canon_query })
  canon_uri = build_canon_uri(uri)
  debug({ "canon_uri" => canon_uri })
  signed_headers = build_signed_headers(headers)
  debug({ "signed_headers" => signed_headers })

  canon_request = [
    method.upcase,
    canon_uri,
    canon_query,
    canon_headers,
    signed_headers,
    SHA256(body),
  ].join("\n")
  debug({ "canon_request" => canon_request })
  canon_request_hash = SHA256(canon_request)
  debug({ "canon_request_hash" => canon_request_hash })

  cred_date = stringify_date(date, false)
  cred_scope = "#{cred_date}/#{REGION}/#{service}/#{AUTH_TYPE}"

  msg_to_sign = [
    ALGO,
    stringify_date(date),
    cred_scope,
    canon_request_hash,
  ].join("\n")
  debug({ "msg_to_sign" => msg_to_sign })

  k0 = HMACSHA256("#{ALGO_PRE}#{secret}", cred_date)
  k1 = HMACSHA256(k0, REGION)
  k2 = HMACSHA256(k1, service)
  k3 = HMACSHA256(k2, AUTH_TYPE)

  HMACSHA256(k3, msg_to_sign).unpack("H*")[0]
end

.generate_signed_auth_header(service, key, secret, method, uri, date, headers, body, params) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 105

def generate_signed_auth_header(service, key, secret, method, uri, date, headers, body, params)
  cred_date = stringify_date(date, false)
  cred_scope = "#{cred_date}/#{REGION}/#{service}/#{AUTH_TYPE}"
  signed_headers = build_signed_headers(headers)
  signature = generate_signature_v1(service, secret, method, uri, date, headers, body, params)
  debug({ "signature" => signature })
  "#{ALGO} Credential=#{key}/#{cred_scope}, SignedHeaders=#{signed_headers}, Signature=#{signature}"
end

.HMACSHA256(key, data) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 15

def HMACSHA256(key, data)
  OpenSSL::HMAC.digest("SHA256", key, data)
end

.SHA256(data) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 19

def SHA256(data)
  OpenSSL::Digest.hexdigest("SHA256", data)
end

.stringify_date(date, full = true) ⇒ Object 



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# File 'lib/kindtap_platform.rb', line 114

def stringify_date(date, full = true)
  date.strftime(full ? "%Y%m%dT%H%M%SZ" : "%Y%m%d")
end