Fixes mm-1355 adds rate limiting apis

api/server.go

@@ -9,7 +9,10 @@ import (
 	"github.com/gorilla/mux"
 	"github.com/mattermost/platform/store"
 	"github.com/mattermost/platform/utils"
+	"github.com/throttled/throttled"
+	throttledStore "github.com/throttled/throttled/store"
 	"net/http"
+	"strings"
 	"time"
 )
 
@@ -35,10 +38,40 @@ func NewServer() {
 
 func StartServer() {
 	l4g.Info("Starting Server...")
-
 	l4g.Info("Server is listening on " + utils.Cfg.ServiceSettings.Port)
+
+	var handler http.Handler = Srv.Router
+
+	if utils.Cfg.RateLimitSettings.UseRateLimiter {
+		l4g.Info("RateLimiter is enabled")
+
+		vary := throttled.VaryBy{}
+
+		if utils.Cfg.RateLimitSettings.VaryByRemoteAddr {
+			vary.RemoteAddr = true
+		}
+
+		if len(utils.Cfg.RateLimitSettings.VaryByHeader) > 0 {
+			vary.Headers = strings.Fields(utils.Cfg.RateLimitSettings.VaryByHeader)
+
+			if utils.Cfg.RateLimitSettings.VaryByRemoteAddr {
+				l4g.Warn("RateLimitSettings not configured properly using VaryByHeader and disabling VaryByRemoteAddr")
+				vary.RemoteAddr = false
+			}
+		}
+
+		th := throttled.RateLimit(throttled.PerSec(utils.Cfg.RateLimitSettings.PerSec), &vary, throttledStore.NewMemStore(utils.Cfg.RateLimitSettings.MemoryStoreSize))
+
+		th.DeniedHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			l4g.Error("%v: code=429 ip=%v", r.URL.Path, GetIpAddress(r))
+			throttled.DefaultDeniedHandler.ServeHTTP(w, r)
+		})
+
+		handler = th.Throttle(Srv.Router)
+	}
+
 	go func() {
-		err := Srv.Server.ListenAndServe(":"+utils.Cfg.ServiceSettings.Port, Srv.Router)
+		err := Srv.Server.ListenAndServe(":"+utils.Cfg.ServiceSettings.Port, handler)
 		if err != nil {
 			l4g.Critical("Error starting server, err:%v", err)
 			time.Sleep(time.Second)