30 lines
1.1 KiB
Go
30 lines
1.1 KiB
Go
package api
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import (
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"net/http"
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)
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// secureHeaders adds strict, privacy-preserving headers to static responses.
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func (s *Server) secureHeaders(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Referrer-Policy", "no-referrer")
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w.Header().Set("Cross-Origin-Opener-Policy", "same-origin")
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w.Header().Set("Cross-Origin-Resource-Policy", "same-site")
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w.Header().Set("Permissions-Policy", "camera=(), microphone=(), geolocation=(), interest-cohort=(), browsing-topics=()")
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w.Header().Set("X-Frame-Options", "DENY")
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w.Header().Set("X-Content-Type-Options", "nosniff")
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w.Header().Set("Strict-Transport-Security", "max-age=15552000; includeSubDomains; preload")
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next.ServeHTTP(w, r)
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})
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}
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// MountStatic mounts a static file server under a prefix onto the provided mux.
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// Usage (from main): s.MountStatic(mux, "/", http.Dir(staticDir))
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func (s *Server) MountStatic(mux *http.ServeMux, prefix string, fs http.FileSystem) {
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if prefix == "" {
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prefix = "/"
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}
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h := http.StripPrefix(prefix, http.FileServer(fs))
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mux.Handle(prefix, s.secureHeaders(h))
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}
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