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package api
import (
"encoding/json"
"net/http"
"sync"
"time"
"github.com/42wim/matterbridge/bridge"
"github.com/42wim/matterbridge/bridge/config"
"github.com/gorilla/websocket"
"github.com/labstack/echo/v4"
"github.com/labstack/echo/v4/middleware"
ring "github.com/zfjagann/golang-ring"
)
type API struct {
Messages ring.Ring
sync.RWMutex
*bridge.Config
}
type Message struct {
Text string `json:"text"`
Username string `json:"username"`
UserID string `json:"userid"`
Avatar string `json:"avatar"`
Gateway string `json:"gateway"`
}
func New(cfg *bridge.Config) bridge.Bridger {
b := &API{Config: cfg}
e := echo.New()
e.HideBanner = true
e.HidePort = true
b.Messages = ring.Ring{}
if b.GetInt("Buffer") != 0 {
b.Messages.SetCapacity(b.GetInt("Buffer"))
}
if b.GetString("Token") != "" {
e.Use(middleware.KeyAuth(func(key string, c echo.Context) (bool, error) {
return key == b.GetString("Token"), nil
}))
}
// Set RemoteNickFormat to a sane default
if !b.IsKeySet("RemoteNickFormat") {
b.Log.Debugln("RemoteNickFormat is unset, defaulting to \"{NICK}\"")
b.Config.Config.Viper().Set(b.GetConfigKey("RemoteNickFormat"), "{NICK}")
}
e.GET("/api/health", b.handleHealthcheck)
e.GET("/api/messages", b.handleMessages)
e.GET("/api/stream", b.handleStream)
e.GET("/api/websocket", b.handleWebsocket)
e.POST("/api/message", b.handlePostMessage)
go func() {
if b.GetString("BindAddress") == "" {
b.Log.Fatalf("No BindAddress configured.")
}
b.Log.Infof("Listening on %s", b.GetString("BindAddress"))
b.Log.Fatal(e.Start(b.GetString("BindAddress")))
}()
return b
}
func (b *API) Connect() error {
return nil
}
func (b *API) Disconnect() error {
return nil
}
func (b *API) JoinChannel(channel config.ChannelInfo) error {
return nil
}
func (b *API) Send(msg config.Message) (string, error) {
b.Lock()
defer b.Unlock()
// ignore delete messages
if msg.Event == config.EventMsgDelete {
return "", nil
}
b.Messages.Enqueue(&msg)
return "", nil
}
func (b *API) handleHealthcheck(c echo.Context) error {
return c.String(http.StatusOK, "OK")
}
func (b *API) handlePostMessage(c echo.Context) error {
message := config.Message{}
if err := c.Bind(&message); err != nil {
return err
}
// these values are fixed
message.Channel = "api"
message.Protocol = "api"
message.Account = b.Account
message.ID = ""
message.Timestamp = time.Now()
b.Log.Debugf("Sending message from %s on %s to gateway", message.Username, "api")
b.Remote <- message
return c.JSON(http.StatusOK, message)
}
func (b *API) handleMessages(c echo.Context) error {
b.Lock()
defer b.Unlock()
c.JSONPretty(http.StatusOK, b.Messages.Values(), " ")
b.Messages = ring.Ring{}
return nil
}
func (b *API) getGreeting() config.Message {
return config.Message{
Event: config.EventAPIConnected,
Timestamp: time.Now(),
}
}
func (b *API) handleStream(c echo.Context) error {
c.Response().Header().Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
c.Response().WriteHeader(http.StatusOK)
greet := b.getGreeting()
if err := json.NewEncoder(c.Response()).Encode(greet); err != nil {
return err
}
c.Response().Flush()
for {
msg := b.Messages.Dequeue()
if msg != nil {
if err := json.NewEncoder(c.Response()).Encode(msg); err != nil {
return err
}
c.Response().Flush()
}
time.Sleep(200 * time.Millisecond)
}
}
func (b *API) handleWebsocketMessage(message config.Message) {
message.Channel = "api"
message.Protocol = "api"
message.Account = b.Account
message.ID = ""
message.Timestamp = time.Now()
b.Log.Debugf("Sending websocket message from %s on %s to gateway", message.Username, "api")
b.Remote <- message
}
func (b *API) writePump(conn *websocket.Conn) {
for {
msg := b.Messages.Dequeue()
if msg != nil {
err := conn.WriteJSON(msg)
if err != nil {
break
}
}
}
}
func (b *API) readPump(conn *websocket.Conn) {
for {
message := config.Message{}
err := conn.ReadJSON(&message)
if err != nil {
break
}
b.handleWebsocketMessage(message)
}
}
func (b *API) handleWebsocket(c echo.Context) error {
conn, err := websocket.Upgrade(c.Response().Writer, c.Request(), nil, 1024, 1024)
if err != nil {
return err
}
greet := b.getGreeting()
_ = conn.WriteJSON(greet)
go b.writePump(conn)
go b.readPump(conn)
return nil
}
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