instance variables => local variables

lib/aliyun_log_ruby_sdk/headers.rb

@@ -11,12 +11,10 @@ module AliyunLogRubySdk
     X_LOG_SIGNATURE_METHOD = 'hmac-sha1'.freeze
 
     def generate_headers(options = {})
-      @options = options
+      headers = options[:headers] || {}
+      host = headers.delete('x-log-host')
 
-      @headers = options[:headers] || {}
-      host = @headers.delete('x-log-host')
-
-      @headers = @headers.merge('x-log-apiversion' => X_LOG_API_VERSION,
+      headers = headers.merge('x-log-apiversion' => X_LOG_API_VERSION,
                               'x-log-signaturemethod' => X_LOG_SIGNATURE_METHOD,
                               'Date' => Time.now.httpdate,
                               'Host' => (host || "#{project_name}.#{endpoint}"))
@@ -24,38 +22,38 @@ module AliyunLogRubySdk
       body = options[:body]
 
       if body.present?
-        @headers['Content-Length'] = body.bytesize.to_s
-        @headers['Content-MD5'] = calculate_md5(body)
+        headers['Content-Length'] = body.bytesize.to_s
+        headers['Content-MD5'] = calculate_md5(body)
       else
-        @headers['Content-Length'] = '0'
-        @headers['x-log-bodyrawsize'] = '0'
+        headers['Content-Length'] = '0'
+        headers['x-log-bodyrawsize'] = '0'
       end
 
-      @headers['Authorization'] = authorization
+      headers['Authorization'] = generate_authorization(options[:verb] || 'GET', headers, options[:resource])
 
-      @headers['x-log-date'] = @headers['Date']
+      headers['x-log-date'] = headers['Date']
 
-      @headers
+      headers
     end
 
     private
 
-    def authorization
-      "LOG #{access_key_id}:#{signature}"
+    def generate_authorization(verb, headers, resource)
+      "LOG #{access_key_id}:#{generate_signature(verb, headers, resource)}"
     end
 
-    def signature
-      Base64.encode64(OpenSSL::HMAC.digest('sha1', access_key_secret, sign_string.encode('utf-8'))).rstrip
+    def generate_signature(verb, headers, resource)
+      Base64.encode64(OpenSSL::HMAC.digest('sha1', access_key_secret, generate_sign_string(verb, headers, resource).encode('utf-8'))).rstrip
     end
 
-    def sign_string
+    def generate_sign_string(verb, headers, resource)
       %W[
-        #{@options[:verb] || 'GET'}
-        #{@headers['Content-MD5']}
-        #{@headers['Content-Type']}
-        #{@headers['Date']}
-        #{canonicalized_log_headers}
-        #{@options[:resource]}
+        #{verb}
+        #{headers['Content-MD5']}
+        #{headers['Content-Type']}
+        #{headers['Date']}
+        #{canonicalized_log_headers(headers)}
+        #{resource}
       ].join("\n")
     end
 
@@ -63,8 +61,8 @@ module AliyunLogRubySdk
       Digest::MD5.hexdigest(body).upcase
     end
 
-    def canonicalized_log_headers
-      @headers.select { |key, _value| key.match(/x-log-*|x-acs-*/) }.map do |key, value|
+    def canonicalized_log_headers(headers)
+      headers.select { |key, _value| key.match(/x-log-*|x-acs-*/) }.map do |key, value|
         "#{key.downcase}:#{value}"
       end.sort.join("\n")
     end