47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
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// Package spa provides the HTTP handler that serves a single-page application.
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package spa
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import (
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"net/http"
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"path/filepath"
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"code.nochebuena.dev/einherjar/contracts/logging"
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)
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type handler struct {
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logger logging.Logger
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staticDir string
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fs http.Handler
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}
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// NewHandler returns an http.Handler that serves static files from staticDir.
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// Requests for paths that exist on disk are served directly.
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// Any other path receives index.html, delegating routing to the SPA.
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func NewHandler(logger logging.Logger, staticDir string) http.Handler {
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return &handler{
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logger: logger,
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staticDir: staticDir,
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fs: http.FileServer(http.Dir(staticDir)),
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}
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}
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func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// http.Dir.Open sanitises the path, preventing directory traversal.
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f, err := http.Dir(h.staticDir).Open(r.URL.Path)
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if err != nil {
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// Path does not exist — hand off to the SPA router.
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http.ServeFile(w, r, filepath.Join(h.staticDir, "index.html"))
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return
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}
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defer f.Close()
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stat, err := f.Stat()
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if err != nil || stat.IsDir() {
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// Directory listing is disabled; treat directories as SPA routes.
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http.ServeFile(w, r, filepath.Join(h.staticDir, "index.html"))
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return
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}
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h.fs.ServeHTTP(w, r)
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}
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