initial commit

internal/util/pht/conn.go

@@ -0,0 +1,176 @@
+package pht
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/base64"
+	"errors"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"time"
+
+	"github.com/go-gost/gost/v3/pkg/logger"
+)
+
+type clientConn struct {
+	client     *http.Client
+	pushURL    string
+	pullURL    string
+	buf        []byte
+	rxc        chan []byte
+	closed     chan struct{}
+	localAddr  net.Addr
+	remoteAddr net.Addr
+	logger     logger.Logger
+}
+
+func (c *clientConn) Read(b []byte) (n int, err error) {
+	if len(c.buf) == 0 {
+		select {
+		case c.buf = <-c.rxc:
+		case <-c.closed:
+			err = net.ErrClosed
+			return
+		}
+	}
+
+	n = copy(b, c.buf)
+	c.buf = c.buf[n:]
+
+	return
+}
+
+func (c *clientConn) Write(b []byte) (n int, err error) {
+	if len(b) == 0 {
+		return
+	}
+
+	buf := bytes.NewBufferString(base64.StdEncoding.EncodeToString(b))
+	buf.WriteByte('\n')
+
+	r, err := http.NewRequest(http.MethodPost, c.pushURL, buf)
+	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))
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		err = errors.New(resp.Status)
+		return
+	}
+
+	n = len(b)
+	return
+}
+
+func (c *clientConn) readLoop() {
+	defer c.Close()
+
+	for {
+		err := func() error {
+			r, err := http.NewRequest(http.MethodGet, c.pullURL, nil)
+			if err != nil {
+				return err
+			}
+
+			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 err
+			}
+			defer resp.Body.Close()
+
+			if c.logger.IsLevelEnabled(logger.DebugLevel) {
+				dump, _ := httputil.DumpResponse(resp, false)
+				c.logger.Debug(string(dump))
+			}
+
+			if resp.StatusCode != http.StatusOK {
+				return errors.New(resp.Status)
+			}
+
+			scanner := bufio.NewScanner(resp.Body)
+			for scanner.Scan() {
+				b, err := base64.StdEncoding.DecodeString(scanner.Text())
+				if err != nil {
+					return err
+				}
+				select {
+				case c.rxc <- b:
+				case <-c.closed:
+					return net.ErrClosed
+				}
+			}
+
+			return scanner.Err()
+		}()
+
+		if err != nil {
+			c.logger.Error(err)
+			return
+		}
+	}
+}
+
+func (c *clientConn) LocalAddr() net.Addr {
+	return c.localAddr
+}
+
+func (c *clientConn) RemoteAddr() net.Addr {
+	return c.remoteAddr
+}
+
+func (c *clientConn) Close() error {
+	select {
+	case <-c.closed:
+	default:
+		close(c.closed)
+	}
+	return nil
+}
+
+func (c *clientConn) SetReadDeadline(t time.Time) error {
+	return nil
+}
+
+func (c *clientConn) SetWriteDeadline(t time.Time) error {
+	return nil
+}
+
+func (c *clientConn) SetDeadline(t time.Time) error {
+	return nil
+}
+
+type serverConn struct {
+	net.Conn
+	remoteAddr net.Addr
+	localAddr  net.Addr
+}
+
+func (c *serverConn) LocalAddr() net.Addr {
+	return c.localAddr
+}
+
+func (c *serverConn) RemoteAddr() net.Addr {
+	return c.remoteAddr
+}