fix gitignore and add missing files

cmd/authproxy/main.go

@@ -0,0 +1,111 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+	"time"
+
+	"gitea.nehmer.net/torben/gitea-mcp-forward-auth/internal/auth"
+)
+
+const (
+	defaultListenAddr = ":8080"
+	defaultLogLevel   = "info"
+	shutdownTimeout   = 10 * time.Second
+)
+
+func main() {
+	os.Exit(run())
+}
+
+func run() int {
+	listenAddr := envOrDefault("AUTH_PROXY_LISTEN_ADDR", defaultListenAddr)
+	hashesDir := os.Getenv("AUTH_PROXY_TOKEN_HASHES_DIR")
+	hashesCSV := os.Getenv(auth.EnvTokenHashes)
+	logLevel := envOrDefault("AUTH_PROXY_LOG_LEVEL", defaultLogLevel)
+
+	logger, err := newLogger(logLevel)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to initialize logger: %v\n", err)
+		return 1
+	}
+
+	hashes, err := auth.LoadTokenHashes(hashesDir, hashesCSV)
+	if err != nil {
+		logger.Error("failed to load token hashes", "error", err)
+		logger.Error("startup aborted: configure at least one hash via AUTH_PROXY_TOKEN_HASHES_DIR and/or AUTH_PROXY_TOKEN_HASHES")
+		return 1
+	}
+
+	validator, err := auth.NewValidator(hashes)
+	if err != nil {
+		logger.Error("failed to initialize validator", "error", err)
+		return 1
+	}
+
+	logger.Info("loaded token set", "token_count", validator.TokenCount())
+
+	handler := auth.NewHandler(validator, logger)
+	server := &http.Server{
+		Addr:              listenAddr,
+		Handler:           handler,
+		ReadHeaderTimeout: 5 * time.Second,
+	}
+
+	errCh := make(chan error, 1)
+	go func() {
+		errCh <- server.ListenAndServe()
+	}()
+
+	logger.Info("auth proxy started", "listen_addr", listenAddr)
+
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
+
+	select {
+	case sig := <-sigCh:
+		logger.Info("shutdown signal received", "signal", sig.String())
+	case err := <-errCh:
+		if err != nil && !errors.Is(err, http.ErrServerClosed) {
+			logger.Error("server failed", "error", err)
+			return 1
+		}
+		return 0
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), shutdownTimeout)
+	defer cancel()
+
+	if err := server.Shutdown(ctx); err != nil {
+		logger.Error("graceful shutdown failed", "error", err)
+		return 1
+	}
+
+	logger.Info("server stopped")
+	return 0
+}
+
+func newLogger(levelRaw string) (*slog.Logger, error) {
+	level := new(slog.LevelVar)
+	if err := level.UnmarshalText([]byte(strings.ToUpper(strings.TrimSpace(levelRaw)))); err != nil {
+		return nil, fmt.Errorf("parse log level %q: %w", levelRaw, err)
+	}
+
+	handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level})
+	return slog.New(handler), nil
+}
+
+func envOrDefault(name, fallback string) string {
+	v := strings.TrimSpace(os.Getenv(name))
+	if v == "" {
+		return fallback
+	}
+	return v
+}