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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package public
import "strings"
// wellKnownMimeTypesLower comes from Golang's builtin mime package: `builtinTypesLower`, see the comment of detectWellKnownMimeType
var wellKnownMimeTypesLower = map[string]string{
".avif": "image/avif",
".css": "text/css; charset=utf-8",
".gif": "image/gif",
".htm": "text/html; charset=utf-8",
".html": "text/html; charset=utf-8",
".jpeg": "image/jpeg",
".jpg": "image/jpeg",
".js": "text/javascript; charset=utf-8",
".json": "application/json",
".mjs": "text/javascript; charset=utf-8",
".pdf": "application/pdf",
".png": "image/png",
".svg": "image/svg+xml",
".wasm": "application/wasm",
".webp": "image/webp",
".xml": "text/xml; charset=utf-8",
// well, there are some types missing from the builtin list
".txt": "text/plain; charset=utf-8",
}
// detectWellKnownMimeType will return the mime-type for a well-known file ext name
// The purpose of this function is to bypass the unstable behavior of Golang's mime.TypeByExtension
// mime.TypeByExtension would use OS's mime-type config to overwrite the well-known types (see its document).
// If the user's OS has incorrect mime-type config, it would make Gitea can not respond a correct Content-Type to browsers.
// For example, if Gitea returns `text/plain` for a `.js` file, the browser couldn't run the JS due to security reasons.
// detectWellKnownMimeType makes the Content-Type for well-known files stable.
func detectWellKnownMimeType(ext string) string {
ext = strings.ToLower(ext)
return wellKnownMimeTypesLower[ext]
}
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