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//Package whatsapp provides a developer API to interact with the WhatsAppWeb-Servers.
package whatsapp
import (
"math/rand"
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
)
type metric byte
const (
debugLog metric = iota + 1
queryResume
queryReceipt
queryMedia
queryChat
queryContacts
queryMessages
presence
presenceSubscribe
group
read
chat
received
pic
status
message
queryActions
block
queryGroup
queryPreview
queryEmoji
queryMessageInfo
spam
querySearch
queryIdentity
queryUrl
profile
contact
queryVcard
queryStatus
queryStatusUpdate
privacyStatus
queryLiveLocations
liveLocation
queryVname
queryLabels
call
queryCall
queryQuickReplies
)
type flag byte
const (
ignore flag = 1 << (7 - iota)
ackRequest
available
notAvailable
expires
skipOffline
)
/*
Conn is created by NewConn. Interacting with the initialized Conn is the main way of interacting with our package.
It holds all necessary information to make the package work internally.
*/
type Conn struct {
ws *websocketWrapper
listener *listenerWrapper
connected bool
loggedIn bool
wg *sync.WaitGroup
session *Session
sessionLock uint32
handler []Handler
msgCount int
msgTimeout time.Duration
Info *Info
Store *Store
ServerLastSeen time.Time
longClientName string
shortClientName string
}
type websocketWrapper struct {
sync.Mutex
conn *websocket.Conn
close chan struct{}
}
type listenerWrapper struct {
sync.RWMutex
m map[string]chan string
}
/*
Creates a new connection with a given timeout. The websocket connection to the WhatsAppWeb servers get´s established.
The goroutine for handling incoming messages is started
*/
func NewConn(timeout time.Duration) (*Conn, error) {
wac := &Conn{
handler: make([]Handler, 0),
msgCount: 0,
msgTimeout: timeout,
Store: newStore(),
longClientName: "github.com/rhymen/go-whatsapp",
shortClientName: "go-whatsapp",
}
return wac, wac.connect()
}
// connect should be guarded with wsWriteMutex
func (wac *Conn) connect() (err error) {
if wac.connected {
return ErrAlreadyConnected
}
wac.connected = true
defer func() { // set connected to false on error
if err != nil {
wac.connected = false
}
}()
dialer := &websocket.Dialer{
ReadBufferSize: 25 * 1024 * 1024,
WriteBufferSize: 10 * 1024 * 1024,
HandshakeTimeout: wac.msgTimeout,
}
headers := http.Header{"Origin": []string{"https://web.whatsapp.com"}}
wsConn, _, err := dialer.Dial("wss://web.whatsapp.com/ws", headers)
if err != nil {
return errors.Wrap(err, "couldn't dial whatsapp web websocket")
}
wsConn.SetCloseHandler(func(code int, text string) error {
// from default CloseHandler
message := websocket.FormatCloseMessage(code, "")
err := wsConn.WriteControl(websocket.CloseMessage, message, time.Now().Add(time.Second))
// our close handling
_, _ = wac.Disconnect()
wac.handle(&ErrConnectionClosed{Code: code, Text: text})
return err
})
wac.ws = &websocketWrapper{
conn: wsConn,
close: make(chan struct{}),
}
wac.listener = &listenerWrapper{
m: make(map[string]chan string),
}
wac.wg = &sync.WaitGroup{}
wac.wg.Add(2)
go wac.readPump()
go wac.keepAlive(20000, 60000)
wac.loggedIn = false
return nil
}
func (wac *Conn) Disconnect() (Session, error) {
if !wac.connected {
return Session{}, ErrNotConnected
}
wac.connected = false
wac.loggedIn = false
close(wac.ws.close) //signal close
wac.wg.Wait() //wait for close
err := wac.ws.conn.Close()
wac.ws = nil
if wac.session == nil {
return Session{}, err
}
return *wac.session, err
}
func (wac *Conn) keepAlive(minIntervalMs int, maxIntervalMs int) {
defer wac.wg.Done()
for {
err := wac.sendKeepAlive()
if err != nil {
wac.handle(errors.Wrap(err, "keepAlive failed"))
//TODO: Consequences?
}
interval := rand.Intn(maxIntervalMs-minIntervalMs) + minIntervalMs
select {
case <-time.After(time.Duration(interval) * time.Millisecond):
case <-wac.ws.close:
return
}
}
}
|
