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rails无法在类initialize方法中生成实例变量以生成httparty请求

httparty ruby

0

Steven Aguilar · 技术社区 · 7 年前

我在生成 Signature 通过一个ruby类。当我进入Docker容器时,我可以看到 initialize 方法是 nil 期待 @api_key 变量。

我有下列课程

require 'openssl'
require 'base64'

module SeamlessGov
  class Form
    include HTTParty
    attr_accessor :form_id
    base_uri "https://nycopp.seamlessdocs.com/api"

    def initialize()
      @api_key = ENV['SEAMLESS_GOV_API_KEY']
      @signature = generate_signature
      @form_id = ENV['SEAMLESS_GOV_FORM_ID']
      @timestamp = Time.now.to_i.to_s
    end

    def relative_uri
      "/form/#{@form_id}/elements"
    end

    def create_form
      self.class.get(relative_uri, headers: generate_headers)
    end

    private

    def generate_signature
      OpenSSL::HMAC.hexdigest('sha256', ENV['SEAMLESS_GOV_SECRET'], "GET+#{relative_uri}+#{@timestamp}")
      binding.pry
    end

    def generate_headers
      {
        "Authorization"  => "HMAC-SHA256 api_key='#{@api_key}' signature='#{@timestamp}'",
         Net::HTTP::ImmutableHeaderKey.new('AuthDate') => "#{@timestamp}"
      }
    end
  end
end

如你所见,从 binding.pry 在 generate_signature 方法我能够看到实例变量:

这个 relative_uri 生成签名所需的方法不会加载 @form_id 字符串中的变量。

这是控制器:

class FormsController < ApplicationController
  def display_form
    @form = SeamlessGov::Form.new().create_form
  end
end

解决问题 net/http 标题区分大小写: lib/net_http

require 'net/http'

class Net::HTTP::ImmutableHeaderKey
  attr_reader :key

  def initialize(key)
    @key = key
  end

  def downcase
    self
  end

  def capitalize
    self
  end

  def split(*)
    [self]
  end

  def hash
    key.hash
  end

  def eql?(other)
    key.eql? other.key.eql?
  end

  def to_s
    def self.to_s
      key
    end
    self
  end
end

如果我打电话 create_form 这是输出:

{"error"=>true,
 "error_log"=>
  [{"error_code"=>"missing_date_headers",
    "error_message"=>"Request is missing date headers",
    "error_description"=>
     "{\"Host\":\"nycopp.seamlessdocs.com\",\"Connection\":\"close\",\"X-Real-IP\":\"71.249.243.7\",\"X-Forwarded-For\":\"71.249.243.7\",\"X-Forwarded-Host\":\"nycopp.seamlessdocs.com\",\"X-Forwarded-Port\":\"443\",\"X-Forwarded-Proto\":\"https\",\"X-Original-URI\":\"\\/api\\/form\\/\\/elements\",\"X-Scheme\":\"https\",\"Authorization\":\"HMAC-SHA256 api_key='h123xxxxxxxxxx' signature=''\",\"AuthDate\":\"\"}"},
   {"error_code"=>"external_auth_error", "error_message"=>"Date header is missing or timestamp out of bounds"}]}

怎么了?

1 回复 | 直到 7 年前

1

Sergio Tulentsev 7 年前

错误在于操作/计算的顺序。

def initialize()
  @api_key = ENV['SEAMLESS_GOV_API_KEY']
  @signature = generate_signature # <= at this point, neither form_id nor timestamp are set. but api key is.
  @form_id = ENV['SEAMLESS_GOV_FORM_ID']
  @timestamp = Time.now.to_i.to_s
end