rename handler files

This commit renames a bunch of files to try to make it a bit less confusing;

protocol_ is now auth as they contained registration, auth and login/out flow
protocol_.*_poll is now poll.go
api.go and other generic handlers are now handlers.go

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

hscontrol/auth_noise.go

@@ -0,0 +1,44 @@
+package hscontrol
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"github.com/rs/zerolog/log"
+	"tailscale.com/tailcfg"
+)
+
+// // NoiseRegistrationHandler handles the actual registration process of a machine.
+func (ns *noiseServer) NoiseRegistrationHandler(
+	writer http.ResponseWriter,
+	req *http.Request,
+) {
+	log.Trace().Caller().Msgf("Noise registration handler for client %s", req.RemoteAddr)
+	if req.Method != http.MethodPost {
+		http.Error(writer, "Wrong method", http.StatusMethodNotAllowed)
+
+		return
+	}
+
+	log.Trace().
+		Any("headers", req.Header).
+		Msg("Headers")
+
+	body, _ := io.ReadAll(req.Body)
+	registerRequest := tailcfg.RegisterRequest{}
+	if err := json.Unmarshal(body, &registerRequest); err != nil {
+		log.Error().
+			Caller().
+			Err(err).
+			Msg("Cannot parse RegisterRequest")
+		machineRegistrations.WithLabelValues("unknown", "web", "error", "unknown").Inc()
+		http.Error(writer, "Internal error", http.StatusInternalServerError)
+
+		return
+	}
+
+	ns.nodeKey = registerRequest.NodeKey
+
+	ns.headscale.handleRegister(writer, req, registerRequest, ns.conn.Peer(), true)
+}