feat: establish secure update foundation

internal/updateagent/controller.go

@@ -11,6 +11,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/root-kdw12/hetzner-api-dyndns-records-webinterface/internal/buildinfo"
 	"github.com/root-kdw12/hetzner-api-dyndns-records-webinterface/internal/updateprotocol"
 )
 
@@ -26,7 +27,16 @@ type Controller struct {
 }
 
 func NewController(runner Runner, logger *slog.Logger) *Controller {
-	return &Controller{runner: runner, logger: logger, status: updateprotocol.Status{Phase: updateprotocol.PhaseIdle, UpdatedAt: time.Now().UTC()}}
+	return &Controller{runner: runner, logger: logger, status: agentStatus(updateprotocol.PhaseIdle)}
+}
+
+func agentStatus(phase string) updateprotocol.Status {
+	return updateprotocol.Status{
+		Phase:        phase,
+		UpdatedAt:    time.Now().UTC(),
+		AgentVersion: buildinfo.Version,
+		Protocol:     buildinfo.UpdateProtocolVersion,
+	}
 }
 
 func (c *Controller) Handler() http.Handler {
@@ -57,9 +67,10 @@ func (c *Controller) updateHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	request.Version = strings.TrimSpace(request.Version)
+	request.CurrentVersion = strings.TrimSpace(request.CurrentVersion)
 	request.RegistryUsername = strings.TrimSpace(request.RegistryUsername)
 	request.RegistryToken = strings.TrimSpace(request.RegistryToken)
-	if !updateprotocol.ValidVersion(request.Version) || request.RegistryUsername == "" || len(request.RegistryUsername) > 128 || len(request.RegistryToken) < 8 || len(request.RegistryToken) > 1024 {
+	if !updateprotocol.ValidVersion(request.Version) || !updateprotocol.ValidVersion(request.CurrentVersion) || request.RegistryUsername == "" || len(request.RegistryUsername) > 128 || len(request.RegistryToken) < 8 || len(request.RegistryToken) > 1024 {
 		http.Error(w, "invalid update request", http.StatusBadRequest)
 		return
 	}
@@ -80,7 +91,7 @@ func (c *Controller) begin(version string) bool {
 		return false
 	}
 	now := time.Now().UTC()
-	c.status = updateprotocol.Status{Phase: updateprotocol.PhaseQueued, TargetVersion: version, Message: "Update eingereiht", StartedAt: now, UpdatedAt: now}
+	c.status = updateprotocol.Status{Phase: updateprotocol.PhaseQueued, TargetVersion: version, Message: "Update eingereiht", StartedAt: now, UpdatedAt: now, AgentVersion: buildinfo.Version, Protocol: buildinfo.UpdateProtocolVersion}
 	return true
 }