initial commit

internal/util/pht/client.go

@@ -0,0 +1,105 @@
+package pht
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"strconv"
+	"strings"
+
+	"github.com/go-gost/gost/v3/pkg/logger"
+)
+
+type Client struct {
+	Host          string
+	Client        *http.Client
+	AuthorizePath string
+	PushPath      string
+	PullPath      string
+	TLSEnabled    bool
+	Logger        logger.Logger
+}
+
+func (c *Client) Dial(ctx context.Context, addr string) (net.Conn, error) {
+	raddr, err := net.ResolveTCPAddr("tcp", addr)
+	if err != nil {
+		c.Logger.Error(err)
+		return nil, err
+	}
+
+	if c.Host != "" {
+		addr = net.JoinHostPort(c.Host, strconv.Itoa(raddr.Port))
+	}
+
+	token, err := c.authorize(ctx, addr)
+	if err != nil {
+		c.Logger.Error(err)
+		return nil, err
+	}
+
+	cn := &clientConn{
+		client:     c.Client,
+		rxc:        make(chan []byte, 128),
+		closed:     make(chan struct{}),
+		localAddr:  &net.TCPAddr{},
+		remoteAddr: raddr,
+		logger:     c.Logger,
+	}
+
+	scheme := "http"
+	if c.TLSEnabled {
+		scheme = "https"
+	}
+	cn.pushURL = fmt.Sprintf("%s://%s%s?token=%s", scheme, addr, c.PushPath, token)
+	cn.pullURL = fmt.Sprintf("%s://%s%s?token=%s", scheme, addr, c.PullPath, token)
+
+	go cn.readLoop()
+
+	return cn, nil
+}
+
+func (c *Client) authorize(ctx context.Context, addr string) (token string, err error) {
+	var url string
+	if c.TLSEnabled {
+		url = fmt.Sprintf("https://%s%s", addr, c.AuthorizePath)
+	} else {
+		url = fmt.Sprintf("http://%s%s", addr, c.AuthorizePath)
+	}
+	r, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return
+	}
+
+	if c.Logger.IsLevelEnabled(logger.DebugLevel) {
+		dump, _ := httputil.DumpRequest(r, false)
+		c.Logger.Debug(string(dump))
+	}
+
+	resp, err := c.Client.Do(r)
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+
+	if c.Logger.IsLevelEnabled(logger.DebugLevel) {
+		dump, _ := httputil.DumpResponse(resp, false)
+		c.Logger.Debug(string(dump))
+	}
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return
+	}
+
+	if strings.HasPrefix(string(data), "token=") {
+		token = strings.TrimPrefix(string(data), "token=")
+	}
+	if token == "" {
+		err = errors.New("authorize failed")
+	}
+	return
+}