Add dependencies/vendor (whatsapp)

vendor/go.mau.fi/whatsmeow/socket/framesocket.go

@@ -0,0 +1,228 @@
+// Copyright (c) 2021 Tulir Asokan
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package socket
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
+
+	waLog "go.mau.fi/whatsmeow/util/log"
+)
+
+type FrameSocket struct {
+	conn   *websocket.Conn
+	ctx    context.Context
+	cancel func()
+	log    waLog.Logger
+	lock   sync.Mutex
+
+	Frames       chan []byte
+	OnDisconnect func(remote bool)
+	WriteTimeout time.Duration
+
+	Header []byte
+
+	incomingLength int
+	receivedLength int
+	incoming       []byte
+	partialHeader  []byte
+}
+
+func NewFrameSocket(log waLog.Logger, header []byte) *FrameSocket {
+	return &FrameSocket{
+		conn:   nil,
+		log:    log,
+		Header: header,
+		Frames: make(chan []byte),
+	}
+}
+
+func (fs *FrameSocket) IsConnected() bool {
+	return fs.conn != nil
+}
+
+func (fs *FrameSocket) Context() context.Context {
+	return fs.ctx
+}
+
+func (fs *FrameSocket) Close(code int) {
+	fs.lock.Lock()
+	defer fs.lock.Unlock()
+
+	if fs.conn == nil {
+		return
+	}
+
+	if code > 0 {
+		message := websocket.FormatCloseMessage(code, "")
+		err := fs.conn.WriteControl(websocket.CloseMessage, message, time.Now().Add(time.Second))
+		if err != nil {
+			fs.log.Warnf("Error sending close message: %v", err)
+		}
+	}
+
+	fs.cancel()
+	err := fs.conn.Close()
+	if err != nil {
+		fs.log.Errorf("Error closing websocket: %v", err)
+	}
+	fs.conn = nil
+	fs.ctx = nil
+	fs.cancel = nil
+	if fs.OnDisconnect != nil {
+		go fs.OnDisconnect(code == 0)
+	}
+}
+
+func (fs *FrameSocket) Connect() error {
+	fs.lock.Lock()
+	defer fs.lock.Unlock()
+
+	if fs.conn != nil {
+		return ErrSocketAlreadyOpen
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	dialer := websocket.Dialer{}
+
+	headers := http.Header{"Origin": []string{Origin}}
+	fs.log.Debugf("Dialing %s", URL)
+	conn, _, err := dialer.Dial(URL, headers)
+	if err != nil {
+		cancel()
+		return fmt.Errorf("couldn't dial whatsapp web websocket: %w", err)
+	}
+
+	fs.ctx, fs.cancel = ctx, cancel
+	fs.conn = conn
+	conn.SetCloseHandler(func(code int, text string) error {
+		fs.log.Debugf("Server closed websocket with status %d/%s", code, text)
+		cancel()
+		// from default CloseHandler
+		message := websocket.FormatCloseMessage(code, "")
+		_ = conn.WriteControl(websocket.CloseMessage, message, time.Now().Add(time.Second))
+		return nil
+	})
+
+	go fs.readPump(conn, ctx)
+	return nil
+}
+
+func (fs *FrameSocket) SendFrame(data []byte) error {
+	conn := fs.conn
+	if conn == nil {
+		return ErrSocketClosed
+	}
+	dataLength := len(data)
+	if dataLength >= FrameMaxSize {
+		return fmt.Errorf("%w (got %d bytes, max %d bytes)", ErrFrameTooLarge, len(data), FrameMaxSize)
+	}
+
+	headerLength := len(fs.Header)
+	// Whole frame is header + 3 bytes for length + data
+	wholeFrame := make([]byte, headerLength+FrameLengthSize+dataLength)
+
+	// Copy the header if it's there
+	if fs.Header != nil {
+		copy(wholeFrame[:headerLength], fs.Header)
+		// We only want to send the header once
+		fs.Header = nil
+	}
+
+	// Encode length of frame
+	wholeFrame[headerLength] = byte(dataLength >> 16)
+	wholeFrame[headerLength+1] = byte(dataLength >> 8)
+	wholeFrame[headerLength+2] = byte(dataLength)
+
+	// Copy actual frame data
+	copy(wholeFrame[headerLength+FrameLengthSize:], data)
+
+	if fs.WriteTimeout > 0 {
+		err := conn.SetWriteDeadline(time.Now().Add(fs.WriteTimeout))
+		if err != nil {
+			fs.log.Warnf("Failed to set write deadline: %v", err)
+		}
+	}
+	return conn.WriteMessage(websocket.BinaryMessage, wholeFrame)
+}
+
+func (fs *FrameSocket) frameComplete() {
+	data := fs.incoming
+	fs.incoming = nil
+	fs.partialHeader = nil
+	fs.incomingLength = 0
+	fs.receivedLength = 0
+	fs.Frames <- data
+}
+
+func (fs *FrameSocket) processData(msg []byte) {
+	for len(msg) > 0 {
+		// This probably doesn't happen a lot (if at all), so the code is unoptimized
+		if fs.partialHeader != nil {
+			msg = append(fs.partialHeader, msg...)
+			fs.partialHeader = nil
+		}
+		if fs.incoming == nil {
+			if len(msg) >= FrameLengthSize {
+				length := (int(msg[0]) << 16) + (int(msg[1]) << 8) + int(msg[2])
+				fs.incomingLength = length
+				fs.receivedLength = len(msg)
+				msg = msg[FrameLengthSize:]
+				if len(msg) >= length {
+					fs.incoming = msg[:length]
+					msg = msg[length:]
+					fs.frameComplete()
+				} else {
+					fs.incoming = make([]byte, length)
+					copy(fs.incoming, msg)
+					msg = nil
+				}
+			} else {
+				fs.log.Warnf("Received partial header (report if this happens often)")
+				fs.partialHeader = msg
+				msg = nil
+			}
+		} else {
+			if len(fs.incoming)+len(msg) >= fs.incomingLength {
+				copy(fs.incoming[fs.receivedLength:], msg[:fs.incomingLength-fs.receivedLength])
+				msg = msg[fs.incomingLength-fs.receivedLength:]
+				fs.frameComplete()
+			} else {
+				copy(fs.incoming[fs.receivedLength:], msg)
+				fs.receivedLength += len(msg)
+				msg = nil
+			}
+		}
+	}
+}
+
+func (fs *FrameSocket) readPump(conn *websocket.Conn, ctx context.Context) {
+	fs.log.Debugf("Frame websocket read pump starting %p", fs)
+	defer func() {
+		fs.log.Debugf("Frame websocket read pump exiting %p", fs)
+		go fs.Close(0)
+	}()
+	for {
+		msgType, data, err := conn.ReadMessage()
+		if err != nil {
+			// Ignore the error if the context has been closed
+			if !errors.Is(ctx.Err(), context.Canceled) {
+				fs.log.Errorf("Error reading from websocket: %v", err)
+			}
+			return
+		} else if msgType != websocket.BinaryMessage {
+			fs.log.Warnf("Got unexpected websocket message type %d", msgType)
+			continue
+		}
+		fs.processData(data)
+	}
+}