refactor user.rb with "http_get" and "http_post" method

lib/weixin_authorize/api/user.rb

@@ -7,21 +7,21 @@ module WeixinAuthorize
       # https://api.weixin.qq.com/cgi-bin/user/info?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN
       # lang: zh_CN, zh_TW, en
       def user(openid, lang="zh_CN")
-        user_info_url = "#{user_base_url}/info?#{access_token_param}&openid=#{openid}&lang=#{lang}"
-        JSON.parse(RestClient.get(user_info_url))
+        user_info_url = "#{user_base_url}/info"
+        http_get(user_info_url, {openid: openid, lang: lang})
       end
 
       # https://api.weixin.qq.com/cgi-bin/user/get?access_token=ACCESS_TOKEN&next_openid=NEXT_OPENID
       # 获取关注者列表
       def followers(next_openid=nil)
-        users_url = "#{user_base_url}/get?#{access_token_param}&next_openid#{next_openid}"
-        JSON.parse(RestClient.get(users_url))
+        followers_url = "#{user_base_url}/get"
+        http_get(followers_url, {next_openid: next_openid})
       end
 
       private
 
         def user_base_url
-          "#{endpoint}/user"
+          "/user"
         end
 
     end