1package server
  2
  3import (
  4	"context"
  5	"io/fs"
  6	"net/http"
  7	"strings"
  8
  9	"github.com/mjensen/weimar/internal/api"
 10	"github.com/mjensen/weimar/internal/auth"
 11	"github.com/mjensen/weimar/internal/config"
 12	"github.com/mjensen/weimar/internal/db"
 13	"github.com/mjensen/weimar/internal/storage"
 14)
 15
 16func New(cfg config.Config, webFS fs.FS, database *db.DB) (*Server, error) {
 17	sm := auth.NewSessionManager(database)
 18	st, err := storage.New(cfg.Storage.Path)
 19	if err != nil {
 20		return nil, err
 21	}
 22	h := api.New(database, sm, st, cfg)
 23
 24	mux := http.NewServeMux()
 25
 26	// Health check (public).
 27	mux.HandleFunc("GET /api/health", handleHealth)
 28
 29	s := &Server{
 30		cfg:  cfg,
 31		mux:  mux,
 32		auth: sm,
 33	}
 34
 35	// Auth (public).
 36	mux.HandleFunc("POST /api/auth/login", h.HandleLogin)
 37	mux.HandleFunc("POST /api/auth/register", h.HandleRegister)
 38
 39	// Auth (authenticated).
 40	mux.HandleFunc("POST /api/auth/logout", s.requireAuth(h.HandleLogout))
 41
 42	// Images (conditionally public).
 43	mux.HandleFunc("POST /api/upload", s.requireAuth(h.HandleUpload))
 44	mux.HandleFunc("GET /api/images", s.requireAuthOrPublic(h.HandleListImages))
 45	mux.HandleFunc("GET /api/images/{id}", s.requireAuthOrPublic(h.HandleGetImage))
 46	mux.HandleFunc("GET /api/images/{id}/download", s.requireAuthOrPublic(h.HandleDownload))
 47	mux.HandleFunc("GET /api/images/{id}/thumbnail", s.requireAuthOrPublic(h.HandleThumbnail))
 48	mux.HandleFunc("POST /api/images/{id}/tags", s.requireAuth(h.HandleAddTags))
 49	mux.HandleFunc("DELETE /api/images/{id}/tags", s.requireAuth(h.HandleRemoveTags))
 50
 51	// Tags (authenticated).
 52	mux.HandleFunc("GET /api/tags/suggest", s.requireAuth(h.HandleTagSuggest))
 53
 54	// Users (authenticated).
 55	mux.HandleFunc("GET /api/users/me", s.requireAuth(h.HandleGetMe))
 56	mux.HandleFunc("POST /api/users/me/avatar", s.requireAuth(h.HandleUploadAvatar))
 57	mux.HandleFunc("GET /api/users/{id}/avatar", h.HandleServeAvatar)
 58
 59	// SPA — serve index.html for all non-API routes (client-side routing).
 60	mux.Handle("/", s.spaHandler(webFS))
 61
 62	return s, nil
 63}
 64
 65type Server struct {
 66	cfg  config.Config
 67	mux  *http.ServeMux
 68	auth *auth.SessionManager
 69}
 70
 71func (s *Server) Start(ctx context.Context) error {
 72	addr := s.cfg.Server.Host + ":" + itoa(s.cfg.Server.Port)
 73
 74	// Wrap the mux with a handler that sets security headers.
 75	handler := securityHeaders(s.mux)
 76
 77	srv := &http.Server{Addr: addr, Handler: handler}
 78
 79	go func() {
 80		<-ctx.Done()
 81		srv.Shutdown(context.Background())
 82	}()
 83
 84	return srv.ListenAndServe()
 85}
 86
 87func itoa(n int) string {
 88	if n == 0 {
 89		return "0"
 90	}
 91	var buf [20]byte
 92	i := len(buf)
 93	for n > 0 {
 94		i--
 95		buf[i] = byte('0' + n%10)
 96		n /= 10
 97	}
 98	return string(buf[i:])
 99}
100
101// spaHandler serves static files for SPA client-side routing.
102// For routes that don't match an existing file (e.g. /browse, /image/123),
103// it falls back to serving index.html so the SPA router can handle them.
104func (s *Server) spaHandler(webFS fs.FS) http.HandlerFunc {
105	fsHandler := http.FileServer(http.FS(webFS))
106	return func(w http.ResponseWriter, r *http.Request) {
107		// API routes should not be served by the SPA handler.
108		if strings.HasPrefix(r.URL.Path, "/api/") {
109			http.NotFound(w, r)
110			return
111		}
112
113		// Check if the requested file exists in the embedded FS.
114		path := strings.TrimPrefix(r.URL.Path, "/")
115		if _, err := fs.Stat(webFS, path); err != nil {
116			// File doesn't exist — serve index.html for SPA routing.
117			r.URL.Path = "/"
118			fsHandler.ServeHTTP(w, r)
119			return
120		}
121
122		// File exists — serve it directly.
123		fsHandler.ServeHTTP(w, r)
124	}
125}
126
127func handleHealth(w http.ResponseWriter, r *http.Request) {
128	w.Header().Set("Content-Type", "application/json")
129	w.Write([]byte(`{"status":"ok"}`))
130}
131
132// securityHeaders wraps a handler with security-related HTTP headers.
133func securityHeaders(next http.Handler) http.Handler {
134	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
135		w.Header().Set("X-Content-Type-Options", "nosniff")
136		w.Header().Set("X-Frame-Options", "DENY")
137		w.Header().Set("Referrer-Policy", "same-origin")
138		next.ServeHTTP(w, r)
139	})
140}