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	// Load the default favicon from the embedded web build.
 25	api.InitDefaultFavicon(webFS)
 26
 27	mux := http.NewServeMux()
 28
 29	// Health check (public).
 30	mux.HandleFunc("GET /api/health", handleHealth)
 31
 32	// Public config.
 33	mux.HandleFunc("GET /api/config", h.HandleConfig)
 34
 35	// Favicon and logo (public).
 36	mux.HandleFunc("GET /favicon", h.HandleFavicon)
 37	mux.HandleFunc("GET /logo", h.HandleLogo)
 38
 39	s := &Server{
 40		cfg:  cfg,
 41		mux:  mux,
 42		auth: sm,
 43	}
 44
 45	// Auth (public).
 46	mux.HandleFunc("POST /api/auth/login", h.HandleLogin)
 47	mux.HandleFunc("POST /api/auth/register", h.HandleRegister)
 48
 49	// Auth (authenticated).
 50	mux.HandleFunc("POST /api/auth/logout", s.requireAuth(h.HandleLogout))
 51
 52	// Images (conditionally public).
 53	mux.HandleFunc("POST /api/upload", s.requireAuth(h.HandleUpload))
 54	mux.HandleFunc("GET /api/images", s.requireAuthOrPublic(h.HandleListImages))
 55	mux.HandleFunc("GET /api/images/{id}", s.requireAuthOrPublic(h.HandleGetImage))
 56	mux.HandleFunc("GET /api/images/{id}/download", s.requireAuthOrPublic(h.HandleDownload))
 57	mux.HandleFunc("GET /api/images/{id}/thumbnail", s.requireAuthOrPublic(h.HandleThumbnail))
 58	mux.HandleFunc("POST /api/images/{id}/tags", s.requireAuth(h.HandleAddTags))
 59	mux.HandleFunc("DELETE /api/images/{id}/tags", s.requireAuth(h.HandleRemoveTags))
 60
 61	// Tags (authenticated).
 62	mux.HandleFunc("GET /api/tags/suggest", s.requireAuth(h.HandleTagSuggest))
 63
 64	// Users (authenticated).
 65	mux.HandleFunc("GET /api/users/me", s.requireAuth(h.HandleGetMe))
 66	mux.HandleFunc("POST /api/users/me/avatar", s.requireAuth(h.HandleUploadAvatar))
 67	mux.HandleFunc("GET /api/users/{id}/avatar", h.HandleServeAvatar)
 68
 69	// SPA — serve index.html for all non-API routes (client-side routing).
 70	mux.Handle("/", s.spaHandler(webFS))
 71
 72	return s, nil
 73}
 74
 75type Server struct {
 76	cfg  *config.Config
 77	mux  *http.ServeMux
 78	auth *auth.SessionManager
 79}
 80
 81func (s *Server) Start(ctx context.Context) error {
 82	addr := s.cfg.Server.Host + ":" + itoa(s.cfg.Server.Port)
 83
 84	// Wrap the mux with a handler that sets security headers.
 85	handler := securityHeaders(s.mux)
 86
 87	srv := &http.Server{Addr: addr, Handler: handler}
 88
 89	go func() {
 90		<-ctx.Done()
 91		srv.Shutdown(context.Background())
 92	}()
 93
 94	if err := srv.ListenAndServe(); err != http.ErrServerClosed {
 95		return err
 96	}
 97	return nil
 98}
 99
100// ReloadConfig atomically swaps the server config. Handlers and middleware
101// read from the pointer at request time and will pick up the new values.
102func (s *Server) ReloadConfig(cfg config.Config) {
103	*s.cfg = cfg
104}
105
106func itoa(n int) string {
107	if n == 0 {
108		return "0"
109	}
110	var buf [20]byte
111	i := len(buf)
112	for n > 0 {
113		i--
114		buf[i] = byte('0' + n%10)
115		n /= 10
116	}
117	return string(buf[i:])
118}
119
120// spaHandler serves static files for SPA client-side routing.
121// For routes that don't match an existing file (e.g. /browse, /image/123),
122// it falls back to serving index.html so the SPA router can handle them.
123func (s *Server) spaHandler(webFS fs.FS) http.HandlerFunc {
124	fsHandler := http.FileServer(http.FS(webFS))
125	return func(w http.ResponseWriter, r *http.Request) {
126		// API routes should not be served by the SPA handler.
127		if strings.HasPrefix(r.URL.Path, "/api/") {
128			http.NotFound(w, r)
129			return
130		}
131
132		// Check if the requested file exists in the embedded FS.
133		path := strings.TrimPrefix(r.URL.Path, "/")
134		if _, err := fs.Stat(webFS, path); err != nil {
135			// File doesn't exist — serve index.html for SPA routing.
136			r.URL.Path = "/"
137			fsHandler.ServeHTTP(w, r)
138			return
139		}
140
141		// File exists — serve it directly.
142		fsHandler.ServeHTTP(w, r)
143	}
144}
145
146func handleHealth(w http.ResponseWriter, r *http.Request) {
147	w.Header().Set("Content-Type", "application/json")
148	w.Write([]byte(`{"status":"ok"}`))
149}
150
151// securityHeaders wraps a handler with security-related HTTP headers.
152func securityHeaders(next http.Handler) http.Handler {
153	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
154		w.Header().Set("X-Content-Type-Options", "nosniff")
155		w.Header().Set("X-Frame-Options", "DENY")
156		w.Header().Set("Referrer-Policy", "same-origin")
157		next.ServeHTTP(w, r)
158	})
159}