//ValidateEventTrackingPayloadHandler validates that the payload has a valid JSON Schema
//Uses a FinalHandler as next because it consumes the request's body
func ValidateEventTrackingPayloadHandler(next *ctx.FinalHandler) *ctx.Handler {
return ctx.NewHandler(next.Context, func(c *ctx.Context, w http.ResponseWriter, r *http.Request) {
//Validate the payload
body, err := ioutil.ReadAll(r.Body)
if err != nil {
c.Logger.Errorf("%s : Error reading body: %s", utilities.GetIP(r), err.Error())
http.Error(w, http.StatusText(500), 500)
return
}
next.Payload = body
requestLoader := gojsonschema.NewStringLoader(string(body))
result, err := c.JSONTrackingEventValidator.Schema.Validate(requestLoader)
if err != nil {
c.Logger.Infof("%s : Json validation error: %s", utilities.GetIP(r), err.Error())
http.Error(w, http.StatusText(400), 400)
return
}
if !result.Valid() {
c.Logger.Infof("%s : Payload is not valid: %+v", utilities.GetIP(r), result.Errors())
http.Error(w, http.StatusText(400), 400)
return
}
next.ServeHTTP(w, r)
})
}
//AuthHandler middleware
//This handler handles auth based on the assertion that the request is valid JSON
//Verifies for access, blocks handlers chain if access denied
func AuthHandler(next *ctx.Handler) *ctx.Handler {
return ctx.NewHandler(next.Context, func(c *ctx.Context, w http.ResponseWriter, r *http.Request) {
//TODO: This can change for body instead ?
token := r.Header.Get("Tracking-Token")
//Bad request token empty or not present
if token == "" {
c.Logger.Infof("%s : No token header", utilities.GetIP(r))
token = r.URL.Query().Get("key")
if token == "" {
c.Logger.Infof("%s : No token query parameter", utilities.GetIP(r))
http.Error(w, http.StatusText(400), 400)
return
}
}
authorized, err := c.AuthDb.IsTokenAuthorized(token)
// Internal server error TODO: Handle this
if err != nil {
c.Logger.Errorf("%s : Error while authorizing: %s", utilities.GetIP(r), err.Error())
http.Error(w, http.StatusText(500), 500)
return
}
// Unauthorized
if !authorized {
c.Logger.Warnf("%s : Unauthorized: %s", utilities.GetIP(r), token)
http.Error(w, http.StatusText(401), 401)
return
}
c.Logger.Infof("%s : Authorized", utilities.GetIP(r))
next.ServeHTTP(w, r)
})
}
//EnforceJSONHandler middleware
//This handler can handle raw requests
//This handler checks for detected content type as well as content-type header
func EnforceJSONHandler(next *ctx.Handler) *ctx.Handler {
return ctx.NewHandler(next.Context, func(c *ctx.Context, w http.ResponseWriter, r *http.Request) {
//Ensure that there is a body
if r.ContentLength == 0 {
c.Logger.Infof("%s : Recieved empty payload", utilities.GetIP(r))
http.Error(w, http.StatusText(400), 400)
return
}
//Ensure that its json
contentType := r.Header.Get("Content-Type")
if contentType != "application/json; charset=UTF-8" {
c.Logger.Infof("%s : Invalid content type. Got %s", utilities.GetIP(r), contentType)
http.Error(w, http.StatusText(415), 415)
return
}
next.ServeHTTP(w, r)
})
}
//Handler for /track route
//From here we have a valid authentified json request with correct schema
func handleTrack(c *ctx.Context, p []byte, w http.ResponseWriter, r *http.Request) {
err := c.Queue.PublishEventsTrackingTask(p)
if err != nil {
//TODO : Could we handle this a little better?
c.Logger.Errorf("Error publishing to queue: %s\nPayload: %s", err.Error(), string(p))
http.Error(w, http.StatusText(500), 500)
}
c.Logger.Infof("%s : Valid payload recieved and treated", utilities.GetIP(r))
}
//Handler for /connected route
//Allows websocket connection
//From here we have an authentified request
func handleConnected(c *ctx.Context, w http.ResponseWriter, r *http.Request) {
const pongWait time.Duration = 10 * time.Second
const writeWait time.Duration = 10 * time.Second
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
//TODO : Could we handle this a little better?
c.Logger.Errorf("%s : Could not upgrade to websocket protocol: %s", utilities.GetIP(r), err.Error())
http.Error(w, http.StatusText(500), 500)
return
}
//We defer the closing of the connection
defer conn.Close()
//Custom settings for timeouts
conn.SetReadDeadline(time.Now().Add(pongWait))
conn.SetPongHandler(func(string) error {
conn.SetReadDeadline(time.Now().Add(pongWait))
return nil
})
for {
messageType, payload, err := conn.ReadMessage()
if err != nil {
if neterr, ok := err.(net.Error); ok && neterr.Timeout() {
c.Logger.Infof("%s : Connection timeout: %s", utilities.GetIP(r), err.Error())
err = conn.WriteControl(websocket.CloseMessage, []byte("Timeout"), time.Now().Add(writeWait))
return
}
c.Logger.Infof("%s : Error reading message: %s", utilities.GetIP(r), err.Error())
err = conn.WriteControl(websocket.CloseInvalidFramePayloadData, []byte("Cannot read message"), time.Now().Add(writeWait))
return
}
if messageType != websocket.TextMessage {
c.Logger.Infof("%s : Unhandled message type : %d", utilities.GetIP(r), messageType)
err = conn.WriteControl(websocket.CloseUnsupportedData, []byte("Unhandled message type"), time.Now().Add(writeWait))
return
}
//We need to validate the payload and then send it
payloadLoader := gojsonschema.NewStringLoader(string(payload))
result, err := c.JSONTrackingEventValidator.Schema.Validate(payloadLoader)
if err != nil {
c.Logger.Infof("%s : Json validation error: %s", utilities.GetIP(r), err.Error())
err = conn.WriteControl(websocket.CloseUnsupportedData, []byte("Json validation error"), time.Now().Add(writeWait))
return
}
if !result.Valid() {
c.Logger.Infof("%s : Payload is not valid: %+v", utilities.GetIP(r), result.Errors())
conn.SetWriteDeadline(time.Now().Add(writeWait))
err = conn.WriteJSON(&wsResponse{"ERROR", "Invalid payload"})
return
}
err = c.Queue.PublishEventsTrackingTask(payload)
if err != nil {
//TODO : Could we handle this a little better?
c.Logger.Errorf("%s : Error publishing to queue: %s\nPayload: %s", utilities.GetIP(r), err.Error(), string(payload))
http.Error(w, http.StatusText(500), 500)
}
//TODO: ack the request
c.Logger.Infof("%s : Valid payload recieved and treated", utilities.GetIP(r))
conn.SetWriteDeadline(time.Now().Add(writeWait))
conn.WriteJSON(&wsResponse{"OK", ""})
}
}