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/poll_noise.go

@@ -0,0 +1,78 @@
+package hscontrol
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+
+	"github.com/rs/zerolog/log"
+	"gorm.io/gorm"
+	"tailscale.com/tailcfg"
+	"tailscale.com/types/key"
+)
+
+// NoisePollNetMapHandler takes care of /machine/:id/map using the Noise protocol
+//
+// This is the busiest endpoint, as it keeps the HTTP long poll that updates
+// the clients when something in the network changes.
+//
+// The clients POST stuff like HostInfo and their Endpoints here, but
+// only after their first request (marked with the ReadOnly field).
+//
+// At this moment the updates are sent in a quite horrendous way, but they kinda work.
+func (ns *noiseServer) NoisePollNetMapHandler(
+	writer http.ResponseWriter,
+	req *http.Request,
+) {
+	log.Trace().
+		Str("handler", "NoisePollNetMap").
+		Msg("PollNetMapHandler called")
+
+	log.Trace().
+		Any("headers", req.Header).
+		Msg("Headers")
+
+	body, _ := io.ReadAll(req.Body)
+
+	mapRequest := tailcfg.MapRequest{}
+	if err := json.Unmarshal(body, &mapRequest); err != nil {
+		log.Error().
+			Caller().
+			Err(err).
+			Msg("Cannot parse MapRequest")
+		http.Error(writer, "Internal error", http.StatusInternalServerError)
+
+		return
+	}
+
+	ns.nodeKey = mapRequest.NodeKey
+
+	machine, err := ns.headscale.db.GetMachineByAnyKey(
+		ns.conn.Peer(),
+		mapRequest.NodeKey,
+		key.NodePublic{},
+	)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			log.Warn().
+				Str("handler", "NoisePollNetMap").
+				Msgf("Ignoring request, cannot find machine with key %s", mapRequest.NodeKey.String())
+			http.Error(writer, "Internal error", http.StatusNotFound)
+
+			return
+		}
+		log.Error().
+			Str("handler", "NoisePollNetMap").
+			Msgf("Failed to fetch machine from the database with node key: %s", mapRequest.NodeKey.String())
+		http.Error(writer, "Internal error", http.StatusInternalServerError)
+
+		return
+	}
+	log.Debug().
+		Str("handler", "NoisePollNetMap").
+		Str("machine", machine.Hostname).
+		Msg("A machine is entering polling via the Noise protocol")
+
+	ns.headscale.handlePoll(writer, req.Context(), machine, mapRequest, true)
+}