点击查看 官方文档

1. 申请appid和appkey 
appidoauth_consumer_keyappkeyoauth_consumer_secret
2. 授权流程 
OAuth2.0codecodetokentoken
3. 代码详解

3.1 获取code

func GetAuthCode(w http.ResponseWriter, r *http.Request) {
	params := url.Values{}
	params.Add("response_type", "code")
	params.Add("client_id", AppId)
	params.Add("state", "test")
	str := fmt.Sprintf("%s&redirect_uri=%s", params.Encode(), redirectURI)
	loginURL := fmt.Sprintf("%s?%s", "https://graph.qq.com/oauth2.0/authorize", str)

	http.Redirect(w, r, loginURL, http.StatusFound)
}

它会自动打开一个网页，我们可以点击我们目前登陆的QQ号进行登陆，或扫码登陆

3.2 获取access_token

codeaccess_token
func GetToken(w http.ResponseWriter, r *http.Request) {
	code := r.FormValue("code")
	params := url.Values{}
	params.Add("grant_type", "authorization_code")
	params.Add("client_id", AppId)
	params.Add("client_secret", AppKey)
	params.Add("code", code)
	str := fmt.Sprintf("%s&redirect_uri=%s", params.Encode(), redirectURI)
	loginURL := fmt.Sprintf("%s?%s", "https://graph.qq.com/oauth2.0/token", str)

	response, err := http.Get(loginURL)
	if err != nil {
		w.Write([]byte(err.Error()))
	}
	defer response.Body.Close()

	bs, _ := ioutil.ReadAll(response.Body)
	body := string(bs)

	resultMap := convertToMap(body)

	info := &PrivateInfo{}
	info.AccessToken = resultMap["access_token"]
	info.RefreshToken = resultMap["refresh_token"]
	info.ExpiresIn = resultMap["expires_in"]

	GetOpenId(info, w)
}

3.3 获取OpenId

OpenId是每一个具体用户在我们平台下的唯一标识，后面的所有请求都会带上这个OpenId

func GetOpenId(info *PrivateInfo, w http.ResponseWriter) {
	resp, err := http.Get(fmt.Sprintf("%s?access_token=%s", "https://graph.qq.com/oauth2.0/me", info.AccessToken))
	if err != nil {
		w.Write([]byte(err.Error()))
	}
	defer resp.Body.Close()

	bs, _ := ioutil.ReadAll(resp.Body)
	body := string(bs)
	info.OpenId = body[45:77]

	GetUserInfo(info, w)
}

3.4 获取用户信息

access_tokenopenId
func GetUserInfo(info *PrivateInfo, w http.ResponseWriter) {
	params := url.Values{}
	params.Add("access_token", info.AccessToken)
	params.Add("openid", info.OpenId)
	params.Add("oauth_consumer_key", AppId)

	uri := fmt.Sprintf("https://graph.qq.com/user/get_user_info?%s", params.Encode())
	resp, err := http.Get(uri)
	if err != nil {
		w.Write([]byte(err.Error()))
	}
	defer resp.Body.Close()

	bs, _ := ioutil.ReadAll(resp.Body)
	w.Write(bs)
}

3.5 全部代码

更具体的代码大家可以去我的GitHub上查看
https://github.com/pibigstar/go-demo/blob/master/sdk/qq/qq_pc_login.go

AppIdAppKey