| 1 | package api |
| 2 | |
| 3 | import ( |
| 4 | "encoding/base64" |
| 5 | "encoding/json" |
| 6 | "net/http" |
| 7 | "strings" |
| 8 | "sync" |
| 9 | "time" |
| 10 | |
| 11 | "github.com/olahol/melody" |
| 12 | |
| 13 | "github.com/labstack/echo/v4" |
| 14 | "github.com/labstack/echo/v4/middleware" |
| 15 | "github.com/matterbridge-org/matterbridge/bridge" |
| 16 | "github.com/matterbridge-org/matterbridge/bridge/config" |
| 17 | "github.com/mitchellh/mapstructure" |
| 18 | ring "github.com/zfjagann/golang-ring" |
| 19 | ) |
| 20 | |
| 21 | type API struct { |
| 22 | Messages ring.Ring |
| 23 | sync.RWMutex |
| 24 | *bridge.Config |
| 25 | mrouter *melody.Melody |
| 26 | } |
| 27 | |
| 28 | type Message struct { |
| 29 | Text string `json:"text"` |
| 30 | Username string `json:"username"` |
| 31 | UserID string `json:"userid"` |
| 32 | Avatar string `json:"avatar"` |
| 33 | Gateway string `json:"gateway"` |
| 34 | } |
| 35 | |
| 36 | func New(cfg *bridge.Config) bridge.Bridger { |
| 37 | b := &API{Config: cfg} |
| 38 | e := echo.New() |
| 39 | e.HideBanner = true |
| 40 | e.HidePort = true |
| 41 | |
| 42 | b.mrouter = melody.New() |
| 43 | b.mrouter.HandleMessage(func(s *melody.Session, msg []byte) { |
| 44 | message := config.Message{} |
| 45 | err := json.Unmarshal(msg, &message) |
| 46 | if err != nil { |
| 47 | b.Log.Errorf("failed to decode message from byte[] '%s'", string(msg)) |
| 48 | return |
| 49 | } |
| 50 | b.handleWebsocketMessage(message, s) |
| 51 | }) |
| 52 | b.mrouter.HandleConnect(func(session *melody.Session) { |
| 53 | greet := b.getGreeting() |
| 54 | data, err := json.Marshal(greet) |
| 55 | if err != nil { |
| 56 | b.Log.Errorf("failed to encode message '%v'", greet) |
| 57 | return |
| 58 | } |
| 59 | err = session.Write(data) |
| 60 | if err != nil { |
| 61 | b.Log.Errorf("failed to write message '%s'", string(data)) |
| 62 | return |
| 63 | } |
| 64 | // TODO: send message history buffer from `b.Messages` here |
| 65 | }) |
| 66 | |
| 67 | b.Messages = ring.Ring{} |
| 68 | if b.GetInt("Buffer") != 0 { |
| 69 | b.Messages.SetCapacity(b.GetInt("Buffer")) |
| 70 | } |
| 71 | if b.GetString("Token") != "" { |
| 72 | e.Use(middleware.KeyAuth(func(key string, c echo.Context) (bool, error) { |
| 73 | return key == b.GetString("Token"), nil |
| 74 | })) |
| 75 | } |
| 76 | |
| 77 | // Set RemoteNickFormat to a sane default |
| 78 | if !b.IsKeySet("RemoteNickFormat") { |
| 79 | b.Log.Debugln("RemoteNickFormat is unset, defaulting to \"{NICK}\"") |
| 80 | b.Config.Config.Viper().Set(b.GetConfigKey("RemoteNickFormat"), "{NICK}") |
| 81 | } |
| 82 | |
| 83 | e.GET("/api/health", b.handleHealthcheck) |
| 84 | e.GET("/api/messages", b.handleMessages) |
| 85 | e.GET("/api/stream", b.handleStream) |
| 86 | e.GET("/api/websocket", b.handleWebsocket) |
| 87 | e.POST("/api/message", b.handlePostMessage) |
| 88 | go func() { |
| 89 | if b.GetString("BindAddress") == "" { |
| 90 | b.Log.Fatalf("No BindAddress configured.") |
| 91 | } |
| 92 | b.Log.Infof("Listening on %s", b.GetString("BindAddress")) |
| 93 | b.Log.Fatal(e.Start(b.GetString("BindAddress"))) |
| 94 | }() |
| 95 | return b |
| 96 | } |
| 97 | |
| 98 | func (b *API) Connect() error { |
| 99 | return nil |
| 100 | } |
| 101 | |
| 102 | func (b *API) Disconnect() error { |
| 103 | return nil |
| 104 | } |
| 105 | |
| 106 | func (b *API) JoinChannel(channel config.ChannelInfo) error { |
| 107 | return nil |
| 108 | } |
| 109 | |
| 110 | func (b *API) Send(msg config.Message) (string, error) { |
| 111 | b.Lock() |
| 112 | defer b.Unlock() |
| 113 | // ignore delete messages |
| 114 | if msg.Event == config.EventMsgDelete { |
| 115 | return "", nil |
| 116 | } |
| 117 | b.Log.Debugf("enqueueing message from %s on ring buffer", msg.Username) |
| 118 | b.Messages.Enqueue(msg) |
| 119 | |
| 120 | data, err := json.Marshal(msg) |
| 121 | if err != nil { |
| 122 | b.Log.Errorf("failed to encode message '%s'", msg) |
| 123 | } |
| 124 | _ = b.mrouter.Broadcast(data) |
| 125 | return "", nil |
| 126 | } |
| 127 | |
| 128 | func (b *API) handleHealthcheck(c echo.Context) error { |
| 129 | return c.String(http.StatusOK, "OK") |
| 130 | } |
| 131 | |
| 132 | func (b *API) handlePostMessage(c echo.Context) error { |
| 133 | message := config.Message{} |
| 134 | if err := c.Bind(&message); err != nil { |
| 135 | return err |
| 136 | } |
| 137 | // these values are fixed |
| 138 | message.Channel = "api" |
| 139 | message.Protocol = "api" |
| 140 | message.Account = b.Account |
| 141 | message.ID = "" |
| 142 | message.Timestamp = time.Now() |
| 143 | |
| 144 | var ( |
| 145 | fm map[string]interface{} |
| 146 | ds string |
| 147 | ok bool |
| 148 | ) |
| 149 | |
| 150 | for i, f := range message.Extra["file"] { |
| 151 | fi := config.FileInfo{} |
| 152 | if fm, ok = f.(map[string]interface{}); !ok { |
| 153 | return echo.NewHTTPError(http.StatusInternalServerError, "invalid format for extra") |
| 154 | } |
| 155 | err := mapstructure.Decode(fm, &fi) |
| 156 | if err != nil { |
| 157 | if !strings.Contains(err.Error(), "got string") { |
| 158 | return err |
| 159 | } |
| 160 | } |
| 161 | // mapstructure doesn't decode base64 into []byte, so it must be done manually for fi.Data |
| 162 | if ds, ok = fm["Data"].(string); !ok { |
| 163 | return echo.NewHTTPError(http.StatusInternalServerError, "invalid format for data") |
| 164 | } |
| 165 | |
| 166 | data, err := base64.StdEncoding.DecodeString(ds) |
| 167 | if err != nil { |
| 168 | return err |
| 169 | } |
| 170 | fi.Data = &data |
| 171 | message.Extra["file"][i] = fi |
| 172 | } |
| 173 | b.Log.Debugf("Sending message from %s on %s to gateway", message.Username, "api") |
| 174 | b.Remote <- message |
| 175 | return c.JSON(http.StatusOK, message) |
| 176 | } |
| 177 | |
| 178 | func (b *API) handleMessages(c echo.Context) error { |
| 179 | b.Lock() |
| 180 | defer b.Unlock() |
| 181 | c.JSONPretty(http.StatusOK, b.Messages.Values(), " ") |
| 182 | b.Messages = ring.Ring{} |
| 183 | return nil |
| 184 | } |
| 185 | |
| 186 | func (b *API) getGreeting() config.Message { |
| 187 | return config.Message{ |
| 188 | Event: config.EventAPIConnected, |
| 189 | Timestamp: time.Now(), |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | func (b *API) handleStream(c echo.Context) error { |
| 194 | c.Response().Header().Set(echo.HeaderContentType, echo.MIMEApplicationJSON) |
| 195 | c.Response().WriteHeader(http.StatusOK) |
| 196 | greet := b.getGreeting() |
| 197 | if err := json.NewEncoder(c.Response()).Encode(greet); err != nil { |
| 198 | return err |
| 199 | } |
| 200 | c.Response().Flush() |
| 201 | for { |
| 202 | select { |
| 203 | // TODO: this causes issues, messages should be broadcasted to all connected clients |
| 204 | default: |
| 205 | msg := b.Messages.Dequeue() |
| 206 | if msg != nil { |
| 207 | if err := json.NewEncoder(c.Response()).Encode(msg); err != nil { |
| 208 | return err |
| 209 | } |
| 210 | c.Response().Flush() |
| 211 | } |
| 212 | time.Sleep(100 * time.Millisecond) |
| 213 | case <-c.Request().Context().Done(): |
| 214 | return nil |
| 215 | } |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | func (b *API) handleWebsocketMessage(message config.Message, s *melody.Session) { |
| 220 | message.Channel = "api" |
| 221 | message.Protocol = "api" |
| 222 | message.Account = b.Account |
| 223 | message.ID = "" |
| 224 | message.Timestamp = time.Now() |
| 225 | |
| 226 | data, err := json.Marshal(message) |
| 227 | if err != nil { |
| 228 | b.Log.Errorf("failed to encode message for loopback '%v'", message) |
| 229 | return |
| 230 | } |
| 231 | _ = b.mrouter.BroadcastOthers(data, s) |
| 232 | |
| 233 | b.Log.Debugf("Sending websocket message from %s on %s to gateway", message.Username, "api") |
| 234 | b.Remote <- message |
| 235 | } |
| 236 | |
| 237 | func (b *API) handleWebsocket(c echo.Context) error { |
| 238 | err := b.mrouter.HandleRequest(c.Response(), c.Request()) |
| 239 | if err != nil { |
| 240 | b.Log.Errorf("error in websocket handling '%v'", err) |
| 241 | return err |
| 242 | } |
| 243 | |
| 244 | return nil |
| 245 | } |
| 246 | |
