init project

app/libs/wechat_oauth/error.rb

@@ -0,0 +1,14 @@
+class WechatOauth::Error < StandardError
+  attr_reader :code
+
+  def initialize(code, msg)
+    super(msg)
+    @code = code
+  end
+
+  def message
+    I18n.t("oauth.wechat.#{code}")
+  rescue I18n::MissingTranslationData
+    super
+  end
+end

app/libs/wechat_oauth/service.rb

@@ -0,0 +1,61 @@
+module WechatOauth::Service
+  module_function
+
+  def request(method, url, params)
+    WechatOauth.logger.info("[WechatOauth] [#{method.to_s.upcase}] #{url} || #{params}")
+
+    client = Faraday.new(url: WechatOauth.base_url)
+    response = client.public_send(method, url, params)
+    result = JSON.parse(response.body)
+
+    WechatOauth.logger.info("[WechatOauth] [#{response.status}] #{result}")
+
+    if result['errcode'].present? && result['errcode'].to_s != '0'
+      raise WechatOauth::Error.new(result['errcode'], result['errmsg'])
+    end
+
+    result
+  end
+
+  # https://developers.weixin.qq.com/doc/oplatform/Website_App/WeChat_Login/Wechat_Login.html
+  # response:
+  # {
+  #   "access_token":"ACCESS_TOKEN",
+  #   "expires_in":7200,
+  #   "refresh_token":"REFRESH_TOKEN",
+  #   "openid":"OPENID",
+  #   "scope":"SCOPE",
+  #   "unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
+  # }
+  def access_token(code)
+    params = {
+      appid: WechatOauth.appid,
+      secret: WechatOauth.secret,
+      code: code,
+      grant_type: 'authorization_code'
+    }
+
+    request(:get, '/sns/oauth2/access_token', params)
+  end
+
+  # https://developers.weixin.qq.com/doc/oplatform/Website_App/WeChat_Login/Authorized_Interface_Calling_UnionID.html
+  # response:
+  # {
+  #   "openid":"OPENID",
+  #   "nickname":"NICKNAME",
+  #   "sex":1,
+  #   "province":"PROVINCE",
+  #   "city":"CITY",
+  #   "country":"COUNTRY",
+  #   "headimgurl": "http://wx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/0",
+  #   "privilege":[
+  #     "PRIVILEGE1",
+  #     "PRIVILEGE2"
+  #   ],
+  #   "unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
+  #
+  # }
+  def user_info(access_token, openid)
+    request(:get, '/sns/userinfo', access_token: access_token, openid: openid)
+  end
+end