// SiYuan - Build Your Eternal Digital Garden
// Copyright (c) 2020-present, b3log.org
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package util

import (
	"context"
	"crypto/tls"
	"net"
	"net/http"
	"strings"
	"time"

	"github.com/88250/gulu"
	"github.com/gin-gonic/gin"
	"github.com/olahol/melody"
)

func GetRemoteAddr(session *melody.Session) string {
	ret := session.Request.Header.Get("X-forwarded-for")
	ret = strings.TrimSpace(ret)
	if "" == ret {
		ret = session.Request.Header.Get("X-Real-IP")
	}
	ret = strings.TrimSpace(ret)
	if "" == ret {
		return session.Request.RemoteAddr
	}
	return strings.Split(ret, ",")[0]
}

func JsonArg(c *gin.Context, result *gulu.Result) (arg map[string]interface{}, ok bool) {
	arg = map[string]interface{}{}
	if err := c.BindJSON(&arg); nil != err {
		result.Code = -1
		result.Msg = "parses request failed"
		return
	}

	ok = true
	return
}

func NewTransport(skipTlsVerify bool) *http.Transport {
	return &http.Transport{
		Proxy: http.ProxyFromEnvironment,
		DialContext: defaultTransportDialContext(&net.Dialer{
			Timeout:   30 * time.Second,
			KeepAlive: 30 * time.Second,
		}),
		ForceAttemptHTTP2:     true,
		MaxIdleConns:          100,
		IdleConnTimeout:       90 * time.Second,
		TLSHandshakeTimeout:   10 * time.Second,
		ExpectContinueTimeout: 1 * time.Second,

		TLSClientConfig: &tls.Config{InsecureSkipVerify: skipTlsVerify}}
}

func defaultTransportDialContext(dialer *net.Dialer) func(context.Context, string, string) (net.Conn, error) {
	return dialer.DialContext
}