service: add RecordSpeedTest gRPC handler with JWT auth + validation

internal/service/recordspeedtest.go

@@ -0,0 +1,90 @@
+package service
+
+import (
+	"context"
+	"strings"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+
+	statsv1 "github.com/bergabruh/stats-gateway/gen/stats/v1"
+	"github.com/bergabruh/stats-gateway/internal/storage"
+)
+
+// RecordSpeedTest ingests a single client-side speedtest sample from an edge
+// node. Authenticates via Bearer JWT (same scheme as Tunnel), validates the
+// request, and persists via the storage layer.
+func (s *Service) RecordSpeedTest(ctx context.Context, req *statsv1.RecordSpeedTestRequest) (*statsv1.RecordSpeedTestResponse, error) {
+	// 1. JWT auth — mirrors the Tunnel handler.
+	md, ok := metadata.FromIncomingContext(ctx)
+	if !ok {
+		return nil, status.Error(codes.Unauthenticated, "no metadata")
+	}
+	authH := md.Get("authorization")
+	if len(authH) == 0 {
+		return nil, status.Error(codes.Unauthenticated, "no auth")
+	}
+	tok := strings.TrimPrefix(authH[0], "Bearer ")
+	if tok == authH[0] {
+		return nil, status.Error(codes.Unauthenticated, "expected Bearer")
+	}
+	if _, err := s.verifier.Verify(tok); err != nil {
+		return nil, status.Errorf(codes.Unauthenticated, "auth: %v", err)
+	}
+
+	// 2. Input validation.
+	if req.Node != "fl" && req.Node != "pl1" {
+		return nil, status.Errorf(codes.InvalidArgument, "node: must be 'fl' or 'pl1', got %q", req.Node)
+	}
+	if !validCountry(req.Country) {
+		return nil, status.Errorf(codes.InvalidArgument, "country: must match ^[A-Z]{2}$ or 'XX', got %q", req.Country)
+	}
+	if req.DlMbps < 0 {
+		return nil, status.Errorf(codes.InvalidArgument, "dl_mbps: must be >= 0, got %v", req.DlMbps)
+	}
+	if req.UlMbps < 0 {
+		return nil, status.Errorf(codes.InvalidArgument, "ul_mbps: must be >= 0, got %v", req.UlMbps)
+	}
+	if req.PingMs < 0 {
+		return nil, status.Errorf(codes.InvalidArgument, "ping_ms: must be >= 0, got %v", req.PingMs)
+	}
+	if req.JitterMs < 0 {
+		return nil, status.Errorf(codes.InvalidArgument, "jitter_ms: must be >= 0, got %v", req.JitterMs)
+	}
+	if req.Timestamp <= 0 {
+		return nil, status.Errorf(codes.InvalidArgument, "timestamp: must be > 0, got %d", req.Timestamp)
+	}
+
+	// 3. Persist.
+	id, err := s.store.SaveSpeedTest(ctx, storage.SpeedTest{
+		Timestamp: req.Timestamp,
+		Node:      req.Node,
+		Country:   req.Country,
+		DlMbps:    req.DlMbps,
+		UlMbps:    req.UlMbps,
+		PingMs:    req.PingMs,
+		JitterMs:  req.JitterMs,
+	})
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "save: %v", err)
+	}
+	return &statsv1.RecordSpeedTestResponse{Id: id}, nil
+}
+
+// validCountry returns true when c is two uppercase ASCII letters (ISO-3166-1
+// alpha-2 shape) or the literal "XX" sentinel for unknown.
+func validCountry(c string) bool {
+	if len(c) != 2 {
+		return false
+	}
+	if c == "XX" {
+		return true
+	}
+	for i := 0; i < 2; i++ {
+		if c[i] < 'A' || c[i] > 'Z' {
+			return false
+		}
+	}
+	return true
+}