64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
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// Copyright (C) 2022 Storj Labs, Inc.
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// See LICENSE for copying information.
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package web
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import (
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"net/http"
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"path"
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"strings"
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)
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// CacheHandler is a middleware for caching static files for 1 year.
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func CacheHandler(fn http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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header := w.Header()
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// "mime" package, which http.FileServer uses, depends on Operating System
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// configuration for mime-types. When a system has hardcoded mime-types to
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// something else, they might serve ".js" as a "plain/text".
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//
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// Override any of that default behavior to ensure we get the correct types for
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// common files.
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if contentType, ok := CommonContentType(path.Ext(r.URL.Path)); ok {
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header.Set("Content-Type", contentType)
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}
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header.Set("Cache-Control", "public, max-age=31536000")
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header.Set("X-Content-Type-Options", "nosniff")
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header.Set("Referrer-Policy", "same-origin")
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fn.ServeHTTP(w, r)
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})
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}
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// CommonContentType returns content-type for common extensions,
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// ignoring OS settings.
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func CommonContentType(ext string) (string, bool) {
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ext = strings.ToLower(ext)
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mime, ok := commonContentType[ext]
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return mime, ok
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}
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var commonContentType = map[string]string{
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".css": "text/css; charset=utf-8",
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".gif": "image/gif",
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".htm": "text/html; charset=utf-8",
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".html": "text/html; charset=utf-8",
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".jpeg": "image/jpeg",
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".jpg": "image/jpeg",
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".js": "application/javascript",
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".mjs": "application/javascript",
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".otf": "font/otf",
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".pdf": "application/pdf",
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".png": "image/png",
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".svg": "image/svg+xml",
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".ttf": "font/ttf",
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".wasm": "application/wasm",
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".webp": "image/webp",
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".xml": "text/xml; charset=utf-8",
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".sfnt": "font/sfnt",
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".woff": "font/woff",
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".woff2": "font/woff2",
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}
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